diff --git a/.envrc b/.envrc
index 163bbd9..3550a30 100644
--- a/.envrc
+++ b/.envrc
@@ -1,3 +1 @@
-#!/usr/bin/env bash
-eval "$(devenv direnvrc)"
-use devenv
+use flake
diff --git a/.gitignore b/.gitignore
index 5976f3d..f1f0b4c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,184 +1,24 @@
-# Created by https://www.toptal.com/developers/gitignore/api/python
-# Edit at https://www.toptal.com/developers/gitignore?templates=python
+# Rust build artifacts
+/target/
 
-### Python ###
-# Byte-compiled / optimized / DLL files
-__pycache__/
-*.py[cod]
-*$py.class
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
 
-# C extensions
-*.so
-
-# Distribution / packaging
-.Python
-build/
-develop-eggs/
-dist/
-downloads/
-eggs/
-.eggs/
-lib/
-lib64/
-parts/
-sdist/
-var/
-wheels/
-share/python-wheels/
-*.egg-info/
-.installed.cfg
-*.egg
-MANIFEST
-
-# PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
-*.manifest
-*.spec
-
-# Installer logs
-pip-log.txt
-pip-delete-this-directory.txt
-
-# Unit test / coverage reports
-htmlcov/
-.tox/
-.nox/
-.coverage
-.coverage.*
-.cache
-nosetests.xml
-coverage.xml
-*.cover
-*.py,cover
-.hypothesis/
-.pytest_cache/
-cover/
-
-# Translations
-*.mo
-*.pot
-
-# Django stuff:
-*.log
-local_settings.py
-db.sqlite3
-db.sqlite3-journal
-
-# Flask stuff:
-instance/
-.webassets-cache
-
-# Scrapy stuff:
-.scrapy
-
-# Sphinx documentation
-docs/_build/
-
-# PyBuilder
-.pybuilder/
-target/
-
-# Jupyter Notebook
-.ipynb_checkpoints
-
-# IPython
-profile_default/
-ipython_config.py
-
-# pyenv
-#   For a library or package, you might want to ignore these files since the code is
-#   intended to run in multiple environments; otherwise, check them in:
-# .python-version
-
-# pipenv
-#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
-#   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don't work, or not
-#   install all needed dependencies.
-#Pipfile.lock
-
-# poetry
-#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
-#   This is especially recommended for binary packages to ensure reproducibility, and is more
-#   commonly ignored for libraries.
-#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
-#poetry.lock
-
-# pdm
-#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
-#pdm.lock
-#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
-#   in version control.
-#   https://pdm.fming.dev/#use-with-ide
-.pdm.toml
-
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
-__pypackages__/
-
-# Celery stuff
-celerybeat-schedule
-celerybeat.pid
-
-# SageMath parsed files
-*.sage.py
-
-# Environments
-.env
-.venv
-env/
-venv/
-ENV/
-env.bak/
-venv.bak/
-
-# Spyder project settings
-.spyderproject
-.spyproject
-
-# Rope project settings
-.ropeproject
-
-# mkdocs documentation
-/site
-
-# mypy
-.mypy_cache/
-.dmypy.json
-dmypy.json
-
-# Pyre type checker
-.pyre/
-
-# pytype static type analyzer
-.pytype/
-
-# Cython debug symbols
-cython_debug/
-
-# PyCharm
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
-
-### Python Patch ###
-# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
-poetry.toml
-
-# ruff
-.ruff_cache/
-
-# LSP config files
-pyrightconfig.json
-
-# End of https://www.toptal.com/developers/gitignore/api/python
+# OS
+.DS_Store
+Thumbs.db
 
+# Nix
 .direnv
-test-report.xml
-.devenv
-.devenv.flake.nix
-.pre-commit-config.yaml
-
 result
+result-*
+
+# Test artifacts
+*.profraw
+*.profdata
+
+.pre-commit-config.yaml
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
deleted file mode 100644
index 46f707d..0000000
--- a/.pre-commit-config.yaml
+++ /dev/null
@@ -1,11 +0,0 @@
-repos:
-  - repo: https://github.com/astral-sh/uv-pre-commit
-    rev: 0.7.13
-    hooks:
-      - id: uv-lock
-  - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.12.0
-    hooks:
-      - id: ruff
-        args: [ --fix ]
-      - id: ruff-format
\ No newline at end of file
diff --git a/.python-version b/.python-version
deleted file mode 100644
index 24ee5b1..0000000
--- a/.python-version
+++ /dev/null
@@ -1 +0,0 @@
-3.13
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..3ca95b6
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,35 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Build & Test Commands
+
+```bash
+nix develop              # Enter dev shell with Rust toolchain
+nix build                # Build the package
+nix flake check          # Run all checks (clippy, fmt, tests, pre-commit)
+
+# Inside nix develop:
+cargo test               # Run all tests
+cargo test test_name     # Run a specific test
+cargo clippy             # Lint
+cargo fmt                # Format
+```
+
+## Architecture
+
+Streamd parses markdown files into hierarchical **Shards**, then **localizes** them by assigning temporal moments and dimensional placements based on `@Tag` markers.
+
+**Data flow:** Markdown → `extract::parser` → `Shard` tree → `localize::shard` → `LocalizedShard` tree
+
+**Key modules:**
+- `models/` — Core types: `Shard`, `LocalizedShard`, `Dimension`, `Marker`, `Timecard`
+- `extract/` — Tag extraction (`tag_extraction.rs`) and markdown parsing (`parser.rs`)
+- `localize/` — DateTime extraction, configuration merging, shard localization
+- `timesheet/` — State machine that converts localized shards into timecards
+- `query/` — Recursive search functions for finding shards by predicate
+- `cli/` — Clap-based CLI commands
+
+## Requirements
+
+`REQUIREMENTS.md` contains the formal specification. Update it along with the `README.md` whenever implementing or changing features.
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5f20392
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1299 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..bc2aaba
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,40 @@
+[package]
+name = "streamd"
+version = "0.1.0"
+edition = "2021"
+description = "Personal knowledge management and time-tracking CLI using @Tag annotations"
+license = "AGPL-3.0-only"
+authors = ["Konstantin Fickel"]
+repository = "https://github.com/konstantinfickel/streamd"
+
+[dependencies]
+clap = { version = "4", features = ["derive", "env"] }
+clap_complete = "4"
+serde = { version = "1", features = ["derive"] }
+serde_yaml = "0.9"
+thiserror = "2"
+miette = { version = "7", features = ["fancy"] }
+pulldown-cmark = "0.12"
+regex = "1"
+once_cell = "1"
+chrono = { version = "0.4", features = ["serde"] }
+walkdir = "2"
+indexmap = { version = "2", features = ["serde"] }
+itertools = "0.13"
+directories = "5"
+
+[dev-dependencies]
+pretty_assertions = "1"
+tempfile = "3"
+
+[[bin]]
+name = "streamd"
+path = "src/main.rs"
+
+[lib]
+name = "streamd"
+path = "src/lib.rs"
+
+[profile.release]
+lto = true
+strip = true
diff --git a/REQUIREMENTS.md b/REQUIREMENTS.md
new file mode 100644
index 0000000..aae1809
--- /dev/null
+++ b/REQUIREMENTS.md
@@ -0,0 +1,375 @@
+# Streamd Requirements
+
+Streamd (stylized as "Strea.md") is a personal knowledge management and time-tracking CLI tool that organizes time-ordered markdown files using `@Tag` annotations.
+
+## Core Concepts
+
+### Shard
+
+A **Shard** is the fundamental unit of content. It represents a section of a markdown file (paragraph, heading, list item) that can contain markers and tags.
+
+```
+Shard {
+    markers: [String]       // @Tag annotations at START of content
+    tags: [String]          // @Tag annotations AFTER content begins
+    start_line: int
+    end_line: int
+    children: [Shard]       // Nested shards (hierarchical)
+}
+```
+
+### LocalizedShard
+
+A **LocalizedShard** extends Shard with temporal and dimensional placement information.
+
+```
+LocalizedShard {
+    markers: [String]
+    tags: [String]
+    start_line: int
+    end_line: int
+    moment: DateTime        // When this entry was created
+    location: Map<String, String>  // Dimension placements
+    children: [LocalizedShard]
+}
+```
+
+---
+
+## Tag Extraction Logic
+
+### R1: Tag Recognition Pattern
+
+Tags are recognized by the regex pattern: `@([^\s*\x60~\[\]]+)`
+
+A tag is `@` followed by word characters, excluding:
+- Whitespace
+- Asterisks `*`
+- Backticks `` ` ``
+- Tildes `~`
+- Brackets `[]`
+
+**Examples of valid tags:**
+- `@Task`, `@Done`, `@Waiting`
+- `@Timesheet`, `@Break`
+- `@ProjectName`, `@Client-ABC`
+
+### R2: Marker vs Tag Distinction
+
+The extraction MUST distinguish between **markers** and **tags** based on their position within a block:
+
+| Type | Position | Purpose |
+|------|----------|---------|
+| **Marker** | Before any non-whitespace content | Semantic classification (triggers shard creation) |
+| **Tag** | After non-whitespace content | Metadata annotation (does not trigger shard creation) |
+
+**Example:**
+```markdown
+@Task @Streamd Working on feature    <!-- @Task and @Streamd are MARKERS -->
+Some text here @CompletedFeature     <!-- @CompletedFeature is a TAG -->
+```
+
+### R3: Marker Boundary Tracking
+
+The extraction algorithm MUST track a "marker boundary" state:
+
+1. Start with `marker_boundary_encountered = false`
+2. While processing tokens:
+   - If whitespace-only: continue (boundary not crossed)
+   - If `@Tag` token found AND boundary NOT crossed: add to markers
+   - If `@Tag` token found AND boundary crossed: add to tags
+   - If any non-whitespace content found: set boundary = crossed
+
+### R4: Nested Token Handling
+
+Tag extraction MUST handle nested markdown formatting:
+
+- Emphasis: `*@Tag*` or `_@Tag_`
+- Strong: `**@Tag**` or `__@Tag__`
+- Strikethrough: `~~@Tag~~`
+- Links: `[@Tag](url)`
+
+Tags inside these formatting elements are still valid and should be extracted.
+
+### R5: Applicable Block Types
+
+Tag extraction applies to:
+- Headings (`# Heading with @Tag`)
+- Paragraphs (`@Tag in paragraph`)
+- Quoute Blocks (`> @Tag in Quote`)
+- List items (each item can have its own markers)
+
+---
+
+## Parsing Logic
+
+### R6: Heading-Based Hierarchy
+
+The parser MUST create a hierarchical shard structure based on markdown headings.
+
+**Algorithm for determining split level:**
+
+1. Find the minimum heading level that either:
+   - Appears 2+ times in the block list, OR
+   - Has markers AND is not the first heading
+2. If no such level exists, do not split (return None)
+
+**Example:**
+```markdown
+# Main Title
+Content here
+
+## Section A        <!-- Split point (level 2 appears twice) -->
+Section A content
+
+## Section B        <!-- Split point -->
+Section B content
+```
+
+### R7: List Item Shard Creation
+
+Each list item with markers MUST become its own shard:
+
+```markdown
+- @Task Item one    <!-- Shard 1 -->
+- @Task Item two    <!-- Shard 2 -->
+- Item three        <!-- NOT a separate shard (no markers) -->
+```
+
+### R8: Shard Simplification
+
+When building shards, apply this optimization:
+- If a shard has exactly 1 child AND no markers AND no tags
+- Return the child directly instead of wrapping it
+
+---
+
+## Dimension Placement Logic
+
+### R9: Dimension Configuration
+
+A **Dimension** defines a classification axis:
+
+```
+Dimension {
+    display_name: String    // For UI display
+    comment: String?        // Documentation
+    propagate: bool         // Whether children inherit this dimension
+}
+```
+
+### R10: Marker Configuration
+
+A **Marker** defines how a tag affects dimension placement:
+
+```
+Marker {
+    display_name: String
+    placements: [MarkerPlacement]
+}
+
+MarkerPlacement {
+    if_with: Set<String>    // Conditional: only apply if ALL these markers present
+    dimension: String       // Target dimension name
+    value: String?          // Value to assign (defaults to marker name)
+    overwrites: bool        // Can overwrite existing placement
+}
+```
+
+### R11: Conditional Placement
+
+Placements with `if_with` conditions MUST only apply when ALL specified markers are present on the same shard.
+
+**Example Configuration:**
+```
+Marker "Task" {
+    placements: [
+        { dimension: "task", value: "open" },
+        { if_with: ["Done"], dimension: "task", value: "done" },
+        { if_with: ["Waiting"], dimension: "task", value: "waiting" },
+    ]
+}
+```
+
+**Behavior:**
+- `@Task` alone → `task: "open"`
+- `@Task @Done` → `task: "done"` (conditional overrides default)
+- `@Task @Waiting` → `task: "waiting"`
+
+### R12: Localization Algorithm
+
+The localization process MUST follow this algorithm:
+
+```
+function localize_shard(shard, config, propagated_from_parent, moment):
+    position = copy(propagated_from_parent)  // Start with inherited
+    private_position = {}                     // Non-propagating dimensions
+
+    for marker in shard.markers:
+        if marker in config.markers:
+            for placement in marker.placements:
+                // Check conditional
+                if placement.if_with is subset of shard.markers:
+                    dimension = config.dimensions[placement.dimension]
+                    value = placement.value OR marker
+
+                    // Check if we can apply this placement
+                    target = dimension.propagate ? position : private_position
+                    if placement.dimension not in target OR placement.overwrites:
+                        target[placement.dimension] = value
+
+    // Recursively localize children with propagating dimensions
+    children = [
+        localize_shard(child, config, position, moment)
+        for child in shard.children
+    ]
+
+    // Merge private dimensions into final position
+    position.update(private_position)
+
+    return LocalizedShard(
+        markers: shard.markers,
+        tags: shard.tags,
+        location: position,
+        moment: moment,
+        children: children,
+    )
+```
+
+### R13: Dimension Propagation
+
+When `propagate = true`:
+- Children inherit the dimension value from their parent
+- Child can override with their own placement
+
+When `propagate = false`:
+- Dimension value is NOT inherited by children
+- Each shard must have its own marker to be placed in this dimension
+
+**Example:**
+```
+dimensions: {
+    "project": { propagate: true },   // Children inherit project
+    "task": { propagate: false },     // Each task is independent
+}
+```
+
+```markdown
+# @Project-X
+## @Task Item A     <!-- project: "Project-X", task: "open" -->
+### Sub-item        <!-- project: "Project-X", task: (none) -->
+## @Task Item B     <!-- project: "Project-X", task: "open" -->
+```
+
+### R14: Overwrite Behavior
+
+Default: A placement does NOT overwrite an existing value in the dimension.
+
+With `overwrites: true`: The placement WILL replace any existing value.
+
+This allows conditional placements to override base placements.
+
+---
+
+## File Naming Convention
+
+### R15: File Name Format
+
+Files follow the pattern: `YYYYMMDD-HHMMSS [markers].md`
+
+- `YYYYMMDD`: Date (8 digits, required)
+- `HHMMSS`: Time (4-6 digits, optional, pads with zeros)
+- `[markers]`: Space-separated marker names extracted from file content
+
+**Extraction regex:** `^(?P<date>\d{8})(?:-(?P<time>\d{4,6}))?.+\.md$`
+
+### R16: Temporal Markers
+
+Special markers can override the file timestamp:
+
+- Date markers: `@YYYYMMDD` (8 digits)
+- Time markers: `@HHMMSS` (6 digits)
+
+These are used for entries that reference a different time than when the file was created.
+
+---
+
+## Timesheet Module
+
+### R17: Timesheet Point Types
+
+```
+TimesheetPointType {
+    Card,       // Clock in / start work
+    Break,      // Clock out / end work
+    SickLeave,
+    Vacation,
+    Holiday,
+    Undertime,
+}
+```
+
+### R18: Timesheet State Machine
+
+Process timesheet shards chronologically per day:
+
+1. Start state: "on break" (not working)
+2. `Card` marker: Transition to "working", record start time
+3. `Break` marker: Transition to "on break", emit timecard from previous start to now
+4. Special markers (SickLeave, Vacation, etc.): Set day type
+
+**Validation:** The last entry of each day MUST be a `Break` (cannot end day while working).
+
+---
+
+## Query System
+
+### R19: Shard Search
+
+Provide recursive search through the shard tree:
+
+- `find_shard(predicate)`: Find all shards matching a predicate function
+- `find_by_position(dimension, value)`: Find shards where `location[dimension] == value`
+- `find_by_set_dimension(dimension)`: Find shards where dimension exists in location
+
+---
+
+## CLI Commands
+
+### R20: Core Commands
+
+| Command | Description |
+|---------|-------------|
+| `streamd new` | Create new timestamped file, open editor, rename with markers on close |
+| `streamd todo` | List all shards with `task: "open"` |
+| `streamd edit [n]` | Edit nth file (supports negative indexing for recent files) |
+| `streamd timesheet` | Extract and export timesheet data as CSV |
+| `streamd completions <shell>` | Generate shell completions (bash, zsh, fish, elvish, powershell) |
+
+---
+
+## Application Configuration
+
+### R22: Config File Location
+
+The application configuration is stored at `~/.config/streamd/config.yaml`:
+
+```yaml
+base_folder: /path/to/stream/files
+```
+
+### R23: Environment Variable Override
+
+The `STREAMD_BASE_FOLDER` environment variable can override the config file setting.
+
+---
+
+## Configuration Merging
+
+### R24: Configuration Composition
+
+Multiple configurations can be merged:
+
+- Dimensions are combined (later configs can add new dimensions)
+- Markers are combined (later configs can add new markers)
+- This allows base configuration + domain-specific extensions
diff --git a/devenv.lock b/devenv.lock
deleted file mode 100644
index 9996189..0000000
--- a/devenv.lock
+++ /dev/null
@@ -1,123 +0,0 @@
-{
-  "nodes": {
-    "devenv": {
-      "locked": {
-        "dir": "src/modules",
-        "lastModified": 1771157881,
-        "owner": "cachix",
-        "repo": "devenv",
-        "rev": "b0b3dfa70ec90fa49f672e579f186faf4f61bd4b",
-        "type": "github"
-      },
-      "original": {
-        "dir": "src/modules",
-        "owner": "cachix",
-        "repo": "devenv",
-        "type": "github"
-      }
-    },
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1767039857,
-        "owner": "NixOS",
-        "repo": "flake-compat",
-        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "git-hooks": {
-      "inputs": {
-        "flake-compat": "flake-compat",
-        "gitignore": "gitignore",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1770726378,
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "rev": "5eaaedde414f6eb1aea8b8525c466dc37bba95ae",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "type": "github"
-      }
-    },
-    "gitignore": {
-      "inputs": {
-        "nixpkgs": [
-          "git-hooks",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1762808025,
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "rev": "cb5e3fdca1de58ccbc3ef53de65bd372b48f567c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "inputs": {
-        "nixpkgs-src": "nixpkgs-src"
-      },
-      "locked": {
-        "lastModified": 1770434727,
-        "owner": "cachix",
-        "repo": "devenv-nixpkgs",
-        "rev": "8430f16a39c27bdeef236f1eeb56f0b51b33d348",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "rolling",
-        "repo": "devenv-nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-src": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1769922788,
-        "narHash": "sha256-H3AfG4ObMDTkTJYkd8cz1/RbY9LatN5Mk4UF48VuSXc=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "207d15f1a6603226e1e223dc79ac29c7846da32e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "devenv": "devenv",
-        "git-hooks": "git-hooks",
-        "nixpkgs": "nixpkgs",
-        "pre-commit-hooks": [
-          "git-hooks"
-        ]
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/devenv.nix b/devenv.nix
deleted file mode 100644
index ce1097e..0000000
--- a/devenv.nix
+++ /dev/null
@@ -1,28 +0,0 @@
-{
-  pkgs,
-  ...
-}:
-{
-  languages = {
-    python = {
-      enable = true;
-      uv.enable = true;
-    };
-  };
-
-  packages = [
-    pkgs.basedpyright
-  ];
-
-  git-hooks.hooks = {
-    basedpyright = {
-      enable = true;
-      entry = "${pkgs.basedpyright}/bin/basedpyright";
-      files = "\\.py$";
-      types = [ "file" ];
-    };
-    ruff.enable = true;
-    ruff-format.enable = true;
-    commitizen.enable = true;
-  };
-}
diff --git a/devenv.yaml b/devenv.yaml
deleted file mode 100644
index 28877ba..0000000
--- a/devenv.yaml
+++ /dev/null
@@ -1,6 +0,0 @@
-inputs:
-  git-hooks:
-    url: github:cachix/git-hooks.nix
-    inputs:
-      nixpkgs:
-        follows: nixpkgs
diff --git a/flake.lock b/flake.lock
index b04d8e3..3232a9b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,5 +1,20 @@
 {
   "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1774313767,
+        "narHash": "sha256-hy0XTQND6avzGEUFrJtYBBpFa/POiiaGBr2vpU6Y9tY=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "3d9df76e29656c679c744968b17fbaf28f0e923d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -25,11 +40,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1770726378,
-        "narHash": "sha256-kck+vIbGOaM/dHea7aTBxdFYpeUl/jHOy5W3eyRvVx8=",
+        "lastModified": 1774104215,
+        "narHash": "sha256-EAtviqz0sEAxdHS4crqu7JGR5oI3BwaqG0mw7CmXkO8=",
         "owner": "cachix",
         "repo": "git-hooks.nix",
-        "rev": "5eaaedde414f6eb1aea8b8525c466dc37bba95ae",
+        "rev": "f799ae951fde0627157f40aec28dec27b22076d0",
         "type": "github"
       },
       "original": {
@@ -61,11 +76,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1771008912,
-        "narHash": "sha256-gf2AmWVTs8lEq7z/3ZAsgnZDhWIckkb+ZnAo5RzSxJg=",
+        "lastModified": 1774386573,
+        "narHash": "sha256-4hAV26quOxdC6iyG7kYaZcM3VOskcPUrdCQd/nx8obc=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "a82ccc39b39b621151d6732718e3e250109076fa",
+        "rev": "46db2e09e1d3f113a13c0d7b81e2f221c63b8ce9",
         "type": "github"
       },
       "original": {
@@ -75,81 +90,31 @@
         "type": "github"
       }
     },
-    "pyproject-build-systems": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "pyproject-nix": [
-          "pyproject-nix"
-        ],
-        "uv2nix": [
-          "uv2nix"
-        ]
-      },
-      "locked": {
-        "lastModified": 1771039651,
-        "narHash": "sha256-WZOfX4APbc6vmL14ZWJXgBeRfEER8H+OIX0D0nSmv0M=",
-        "owner": "pyproject-nix",
-        "repo": "build-system-pkgs",
-        "rev": "69bc2b53b79cbd6ce9f66f506fc962b45b5e68b9",
-        "type": "github"
-      },
-      "original": {
-        "owner": "pyproject-nix",
-        "repo": "build-system-pkgs",
-        "type": "github"
-      }
-    },
-    "pyproject-nix": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1769936401,
-        "narHash": "sha256-kwCOegKLZJM9v/e/7cqwg1p/YjjTAukKPqmxKnAZRgA=",
-        "owner": "pyproject-nix",
-        "repo": "pyproject.nix",
-        "rev": "b0d513eeeebed6d45b4f2e874f9afba2021f7812",
-        "type": "github"
-      },
-      "original": {
-        "owner": "pyproject-nix",
-        "repo": "pyproject.nix",
-        "type": "github"
-      }
-    },
     "root": {
       "inputs": {
+        "crane": "crane",
         "git-hooks": "git-hooks",
         "nixpkgs": "nixpkgs",
-        "pyproject-build-systems": "pyproject-build-systems",
-        "pyproject-nix": "pyproject-nix",
-        "uv2nix": "uv2nix"
+        "rust-overlay": "rust-overlay"
       }
     },
-    "uv2nix": {
+    "rust-overlay": {
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
-        ],
-        "pyproject-nix": [
-          "pyproject-nix"
         ]
       },
       "locked": {
-        "lastModified": 1770770348,
-        "narHash": "sha256-A2GzkmzdYvdgmMEu5yxW+xhossP+txrYb7RuzRaqhlg=",
-        "owner": "pyproject-nix",
-        "repo": "uv2nix",
-        "rev": "5d1b2cb4fe3158043fbafbbe2e46238abbc954b0",
+        "lastModified": 1774753967,
+        "narHash": "sha256-HpT5fE8JQSbAxolUnw3VgGAo3urVjcrgtB2rtoxURVw=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "405b9b4c2c6c5a2b1d390524ce8a240729f34a96",
         "type": "github"
       },
       "original": {
-        "owner": "pyproject-nix",
-        "repo": "uv2nix",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
         "type": "github"
       }
     }
diff --git a/flake.nix b/flake.nix
index 32093d0..c77eb59 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,23 +4,12 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
-    pyproject-nix = {
-      url = "github:pyproject-nix/pyproject.nix";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    uv2nix = {
-      url = "github:pyproject-nix/uv2nix";
-      inputs.pyproject-nix.follows = "pyproject-nix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-
-    pyproject-build-systems = {
-      url = "github:pyproject-nix/build-system-pkgs";
-      inputs.pyproject-nix.follows = "pyproject-nix";
-      inputs.uv2nix.follows = "uv2nix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
+    crane.url = "github:ipetkov/crane";
 
     git-hooks = {
       url = "github:cachix/git-hooks.nix";
@@ -32,9 +21,8 @@
     {
       self,
       nixpkgs,
-      pyproject-nix,
-      uv2nix,
-      pyproject-build-systems,
+      rust-overlay,
+      crane,
       git-hooks,
       ...
     }:
@@ -42,110 +30,87 @@
       inherit (nixpkgs) lib;
       forAllSystems = lib.genAttrs lib.systems.flakeExposed;
 
-      workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
+      mkPkgs =
+        system:
+        import nixpkgs {
+          inherit system;
+          overlays = [ rust-overlay.overlays.default ];
+        };
 
-      overlay = workspace.mkPyprojectOverlay {
-        sourcePreference = "wheel";
-      };
-
-      editableOverlay = workspace.mkEditablePyprojectOverlay {
-        root = "$REPO_ROOT";
-      };
-
-      pythonSets = forAllSystems (
+      mkCraneLib =
         system:
         let
-          pkgs = nixpkgs.legacyPackages.${system};
-          inherit (pkgs) stdenv;
-
-          baseSet = pkgs.callPackage pyproject-nix.build.packages {
-            python = pkgs.python313;
+          pkgs = mkPkgs system;
+          toolchain = pkgs.rust-bin.stable.latest.default.override {
+            extensions = [
+              "rust-src"
+              "rust-analyzer"
+            ];
           };
-
-          pyprojectOverrides = _final: prev: {
-            streamd = prev.streamd.overrideAttrs (old: {
-              passthru = old.passthru // {
-                tests = (old.passthru.tests or { }) // {
-                  pytest = stdenv.mkDerivation {
-                    name = "${_final.streamd.name}-pytest";
-                    inherit (_final.streamd) src;
-                    nativeBuildInputs = [
-                      (_final.mkVirtualEnv "streamd-pytest-env" {
-                        streamd = [ "dev" ];
-                      })
-                    ];
-                    dontConfigure = true;
-                    buildPhase = ''
-                      runHook preBuild
-                      # Exit code 5 means no tests collected — allow it so the
-                      # check succeeds on an empty test suite.
-                      pytest || [ $? -eq 5 ]
-                      runHook postBuild
-                    '';
-                    installPhase = ''
-                      runHook preInstall
-                      touch $out
-                      runHook postInstall
-                    '';
-                  };
-                };
-              };
-            });
-          };
-
         in
-        baseSet.overrideScope (
-          lib.composeManyExtensions [
-            pyproject-build-systems.overlays.default
-            overlay
-            pyprojectOverrides
-          ]
-        )
-      );
+        (crane.mkLib pkgs).overrideToolchain toolchain;
+
+      mkStreamd =
+        system:
+        let
+          craneLib = mkCraneLib system;
+
+          commonArgs = {
+            src = craneLib.path ./.;
+            pname = "streamd";
+            version = "0.1.0";
+            strictDeps = true;
+          };
+
+          cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+        in
+        craneLib.buildPackage (
+          commonArgs
+          // {
+            inherit cargoArtifacts;
+
+            passthru = {
+              inherit cargoArtifacts;
+              tests = {
+                clippy = craneLib.cargoClippy (
+                  commonArgs
+                  // {
+                    inherit cargoArtifacts;
+                    cargoClippyExtraArgs = "--all-targets -- -D warnings";
+                  }
+                );
+                fmt = craneLib.cargoFmt { src = commonArgs.src; };
+                test = craneLib.cargoTest (commonArgs // { inherit cargoArtifacts; });
+              };
+            };
+          }
+        );
 
       mkGitHooksCheck =
         system:
         let
-          pkgs = nixpkgs.legacyPackages.${system};
-          pythonSet = pythonSets.${system};
-          venv = pythonSet.mkVirtualEnv "streamd-check-env" workspace.deps.all;
+          pkgs = mkPkgs system;
+          toolchain = pkgs.rust-bin.stable.latest.default;
         in
         git-hooks.lib.${system}.run {
           src = ./.;
           hooks = {
-            basedpyright = {
+            rustfmt = {
               enable = true;
-              entry = "${pkgs.basedpyright}/bin/basedpyright --pythonpath ${venv}/bin/python --project ${
-                pkgs.writeText "pyrightconfig.json" (
-                  builtins.toJSON {
-                    reportMissingTypeStubs = false;
-                    reportUnnecessaryTypeIgnoreComment = false;
-                  }
-                )
-              }";
-              files = "\\.py$";
-              types = [ "file" ];
+              package = toolchain;
             };
-            ruff.enable = true;
-            ruff-format.enable = true;
             commitizen.enable = true;
           };
         };
-
     in
     {
       packages = forAllSystems (
         system:
         let
-          pythonSet = pythonSets.${system};
-          pkgs = nixpkgs.legacyPackages.${system};
-          inherit (pkgs.callPackages pyproject-nix.build.util { }) mkApplication;
+          streamd = mkStreamd system;
         in
-        rec {
-          streamd = mkApplication {
-            venv = pythonSet.mkVirtualEnv "streamd-env" workspace.deps.default;
-            package = pythonSet.streamd;
-          };
+        {
+          inherit streamd;
           default = streamd;
         }
       );
@@ -171,8 +136,8 @@
 
             package = lib.mkOption {
               type = lib.types.package;
-              default = self.packages.${pkgs.system}.streamd;
-              defaultText = lib.literalExpression "inputs.streamd.packages.\${pkgs.system}.streamd";
+              default = self.packages.${pkgs.stdenv.hostPlatform.system}.streamd;
+              defaultText = lib.literalExpression "inputs.streamd.packages.\${pkgs.stdenv.hostPlatform.system}.streamd";
               description = "The package to use for the streamd binary.";
             };
           };
@@ -191,16 +156,24 @@
                 };
 
             home.shellAliases.s = "streamd";
+
+            programs.bash.initExtra = ''
+              eval "$(${cfg.package}/bin/streamd completions bash)"
+            '';
+
+            programs.zsh.initExtra = ''
+              eval "$(${cfg.package}/bin/streamd completions zsh)"
+            '';
           };
         };
 
       checks = forAllSystems (
         system:
         let
-          pythonSet = pythonSets.${system};
+          streamd = mkStreamd system;
         in
         {
-          inherit (pythonSet.streamd.passthru.tests) pytest;
+          inherit (streamd.passthru.tests) clippy fmt test;
           pre-commit = mkGitHooksCheck system;
         }
       );
@@ -208,24 +181,22 @@
       devShells = forAllSystems (
         system:
         let
-          pkgs = nixpkgs.legacyPackages.${system};
-          pythonSet = pythonSets.${system}.overrideScope editableOverlay;
-          virtualenv = pythonSet.mkVirtualEnv "streamd-dev-env" workspace.deps.all;
+          pkgs = mkPkgs system;
+          toolchain = pkgs.rust-bin.stable.latest.default.override {
+            extensions = [
+              "rust-src"
+              "rust-analyzer"
+            ];
+          };
         in
         {
           default = pkgs.mkShell {
             packages = [
-              virtualenv
-              pkgs.uv
+              toolchain
+              pkgs.commitizen
             ];
-            env = {
-              UV_NO_SYNC = "1";
-              UV_PYTHON = pythonSet.python.interpreter;
-              UV_PYTHON_DOWNLOADS = "never";
-            };
+
             shellHook = ''
-              unset PYTHONPATH
-              export REPO_ROOT=$(git rev-parse --show-toplevel)
               ${(mkGitHooksCheck system).shellHook}
             '';
           };
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index 4cd209f..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,30 +0,0 @@
-[project]
-name = "streamd"
-version = "0.1.0"
-description = "Searching for tags in streams"
-readme = "README.md"
-requires-python = ">=3.13"
-dependencies = [
-    "click==8.3.1",
-    "mistletoe==1.5.1",
-    "pydantic==2.12.5",
-    "pydantic-settings[yaml]==2.12.0",
-    "rich==14.3.2",
-    "typer==0.23.1",
-    "xdg-base-dirs==6.0.2",
-]
-
-[project.scripts]
-streamd = "streamd:app"
-
-[build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
-
-[dependency-groups]
-dev = [
-    "basedpyright==1.38.0",
-    "faker==40.4.0",
-    "pytest==9.0.2",
-    "ruff==0.15.1",
-]
diff --git a/src/cli/args.rs b/src/cli/args.rs
new file mode 100644
index 0000000..cb2c504
--- /dev/null
+++ b/src/cli/args.rs
@@ -0,0 +1,40 @@
+use clap::{Parser, Subcommand};
+use clap_complete::Shell;
+
+#[derive(Parser)]
+#[command(name = "streamd")]
+#[command(
+    author,
+    version,
+    about = "Personal knowledge management and time-tracking CLI using @Tag annotations"
+)]
+pub struct Cli {
+    #[command(subcommand)]
+    pub command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+pub enum Commands {
+    /// Create a new stream file
+    New,
+
+    /// Display open tasks
+    Todo,
+
+    /// Edit a stream file by position
+    Edit {
+        /// Position of the file to edit (0 = most recent, negative = from oldest)
+        #[arg(default_value = "1")]
+        number: i32,
+    },
+
+    /// Display extracted timesheets
+    Timesheet,
+
+    /// Generate shell completions
+    Completions {
+        /// Shell to generate completions for
+        #[arg(value_enum)]
+        shell: Shell,
+    },
+}
diff --git a/src/cli/commands/completions.rs b/src/cli/commands/completions.rs
new file mode 100644
index 0000000..c9c93fc
--- /dev/null
+++ b/src/cli/commands/completions.rs
@@ -0,0 +1,11 @@
+use clap::CommandFactory;
+use clap_complete::{generate, Shell};
+use std::io;
+
+use crate::cli::Cli;
+
+pub fn run(shell: Shell) {
+    let mut cmd = Cli::command();
+    let name = cmd.get_name().to_string();
+    generate(shell, &mut cmd, name, &mut io::stdout());
+}
diff --git a/src/cli/commands/edit.rs b/src/cli/commands/edit.rs
new file mode 100644
index 0000000..89a0240
--- /dev/null
+++ b/src/cli/commands/edit.rs
@@ -0,0 +1,73 @@
+use std::fs;
+use std::process::Command;
+
+use walkdir::WalkDir;
+
+use crate::config::Settings;
+use crate::error::StreamdError;
+use crate::extract::parse_markdown_file;
+use crate::localize::{localize_stream_file, TaskConfiguration};
+use crate::models::LocalizedShard;
+
+fn all_files() -> Result<Vec<LocalizedShard>, StreamdError> {
+    let settings = Settings::load()?;
+    let mut shards = Vec::new();
+
+    for entry in WalkDir::new(&settings.base_folder)
+        .max_depth(1)
+        .into_iter()
+        .filter_map(|e| e.ok())
+    {
+        let path = entry.path();
+        if path.extension().map(|e| e == "md").unwrap_or(false) {
+            let file_name = path.to_string_lossy().to_string();
+            let content = fs::read_to_string(path)?;
+            let stream_file = parse_markdown_file(&file_name, &content);
+
+            if let Ok(shard) = localize_stream_file(&stream_file, &TaskConfiguration) {
+                shards.push(shard);
+            }
+        }
+    }
+
+    Ok(shards)
+}
+
+pub fn run(number: i32) -> Result<(), StreamdError> {
+    let all_shards = all_files()?;
+
+    // Sort by moment (timestamp)
+    let mut sorted_shards = all_shards;
+    sorted_shards.sort_by_key(|s| s.moment);
+
+    if sorted_shards.is_empty() {
+        return Err(StreamdError::ConfigError("No files found".to_string()));
+    }
+
+    let selected_index = if number >= 0 {
+        // 0 = most recent, 1 = second most recent, etc.
+        let idx = sorted_shards.len() as i32 - number;
+        if idx < 0 {
+            return Err(StreamdError::ConfigError(
+                "Argument out of range".to_string(),
+            ));
+        }
+        idx as usize
+    } else {
+        // -1 = oldest, -2 = second oldest, etc.
+        let idx = (-number - 1) as usize;
+        if idx >= sorted_shards.len() {
+            return Err(StreamdError::ConfigError(
+                "Argument out of range".to_string(),
+            ));
+        }
+        idx
+    };
+
+    if let Some(file_path) = sorted_shards[selected_index].location.get("file") {
+        let editor = std::env::var("EDITOR").unwrap_or_else(|_| "vi".to_string());
+        Command::new(&editor).arg(file_path).status()?;
+    }
+
+    Ok(())
+}
diff --git a/src/cli/commands/mod.rs b/src/cli/commands/mod.rs
new file mode 100644
index 0000000..d5f79ce
--- /dev/null
+++ b/src/cli/commands/mod.rs
@@ -0,0 +1,5 @@
+pub mod completions;
+pub mod edit;
+pub mod new;
+pub mod timesheet;
+pub mod todo;
diff --git a/src/cli/commands/new.rs b/src/cli/commands/new.rs
new file mode 100644
index 0000000..de7d351
--- /dev/null
+++ b/src/cli/commands/new.rs
@@ -0,0 +1,60 @@
+use std::fs;
+use std::io::Write;
+use std::path::Path;
+use std::process::Command;
+
+use chrono::Local;
+
+use crate::config::Settings;
+use crate::error::StreamdError;
+use crate::extract::parse_markdown_file;
+
+pub fn run() -> Result<(), StreamdError> {
+    let settings = Settings::load()?;
+    let streamd_directory = &settings.base_folder;
+
+    let timestamp = Local::now().format("%Y%m%d-%H%M%S").to_string();
+    let preliminary_file_name = format!("{}_wip.md", timestamp);
+    let preliminary_path = Path::new(streamd_directory).join(&preliminary_file_name);
+
+    // Create initial file with heading
+    let content = "# ";
+    let mut file = fs::File::create(&preliminary_path)?;
+    file.write_all(content.as_bytes())?;
+    drop(file);
+
+    // Open in editor
+    let editor = std::env::var("EDITOR").unwrap_or_else(|_| "vi".to_string());
+    let status = Command::new(&editor).arg(&preliminary_path).status()?;
+
+    if !status.success() {
+        return Err(StreamdError::IoError(std::io::Error::other(
+            "Editor exited with non-zero status",
+        )));
+    }
+
+    // Read the edited content
+    let edited_content = fs::read_to_string(&preliminary_path)?;
+    let parsed_content =
+        parse_markdown_file(preliminary_path.to_string_lossy().as_ref(), &edited_content);
+
+    // Determine final filename based on markers
+    let final_file_name = if let Some(ref shard) = parsed_content.shard {
+        if !shard.markers.is_empty() {
+            format!("{} {}.md", timestamp, shard.markers.join(" "))
+        } else {
+            format!("{}.md", timestamp)
+        }
+    } else {
+        format!("{}.md", timestamp)
+    };
+
+    let final_path = Path::new(streamd_directory).join(&final_file_name);
+
+    // Rename the file
+    fs::rename(&preliminary_path, &final_path)?;
+
+    println!("Saved as {}", final_file_name);
+
+    Ok(())
+}
diff --git a/src/cli/commands/timesheet.rs b/src/cli/commands/timesheet.rs
new file mode 100644
index 0000000..f727edc
--- /dev/null
+++ b/src/cli/commands/timesheet.rs
@@ -0,0 +1,52 @@
+use std::fs;
+
+use walkdir::WalkDir;
+
+use crate::config::Settings;
+use crate::error::StreamdError;
+use crate::extract::parse_markdown_file;
+use crate::localize::localize_stream_file;
+use crate::models::LocalizedShard;
+use crate::timesheet::{extract_timesheets, BasicTimesheetConfiguration};
+
+fn all_files() -> Result<Vec<LocalizedShard>, StreamdError> {
+    let settings = Settings::load()?;
+    let mut shards = Vec::new();
+
+    for entry in WalkDir::new(&settings.base_folder)
+        .max_depth(1)
+        .into_iter()
+        .filter_map(|e| e.ok())
+    {
+        let path = entry.path();
+        if path.extension().map(|e| e == "md").unwrap_or(false) {
+            let file_name = path.to_string_lossy().to_string();
+            let content = fs::read_to_string(path)?;
+            let stream_file = parse_markdown_file(&file_name, &content);
+
+            if let Ok(shard) = localize_stream_file(&stream_file, &BasicTimesheetConfiguration) {
+                shards.push(shard);
+            }
+        }
+    }
+
+    Ok(shards)
+}
+
+pub fn run() -> Result<(), StreamdError> {
+    let all_shards = all_files()?;
+    let mut sheets = extract_timesheets(&all_shards)?;
+    sheets.sort_by_key(|s| s.date);
+
+    for sheet in sheets {
+        println!("{}", sheet.date);
+        let times: Vec<String> = sheet
+            .timecards
+            .iter()
+            .map(|card| format!("{},{}", card.from_time, card.to_time))
+            .collect();
+        println!("{}", times.join(","));
+    }
+
+    Ok(())
+}
diff --git a/src/cli/commands/todo.rs b/src/cli/commands/todo.rs
new file mode 100644
index 0000000..ee5a422
--- /dev/null
+++ b/src/cli/commands/todo.rs
@@ -0,0 +1,56 @@
+use std::fs;
+
+use walkdir::WalkDir;
+
+use crate::config::Settings;
+use crate::error::StreamdError;
+use crate::extract::parse_markdown_file;
+use crate::localize::{localize_stream_file, TaskConfiguration};
+use crate::models::LocalizedShard;
+use crate::query::find_shard_by_position;
+
+fn all_files() -> Result<Vec<LocalizedShard>, StreamdError> {
+    let settings = Settings::load()?;
+    let mut shards = Vec::new();
+
+    for entry in WalkDir::new(&settings.base_folder)
+        .max_depth(1)
+        .into_iter()
+        .filter_map(|e| e.ok())
+    {
+        let path = entry.path();
+        if path.extension().map(|e| e == "md").unwrap_or(false) {
+            let file_name = path.to_string_lossy().to_string();
+            let content = fs::read_to_string(path)?;
+            let stream_file = parse_markdown_file(&file_name, &content);
+
+            if let Ok(shard) = localize_stream_file(&stream_file, &TaskConfiguration) {
+                shards.push(shard);
+            }
+        }
+    }
+
+    Ok(shards)
+}
+
+pub fn run() -> Result<(), StreamdError> {
+    let all_shards = all_files()?;
+
+    for task_shard in find_shard_by_position(&all_shards, "task", "open") {
+        if let Some(file_path) = task_shard.location.get("file") {
+            let content = fs::read_to_string(file_path)?;
+            let lines: Vec<&str> = content.lines().collect();
+
+            let start = task_shard.start_line.saturating_sub(1);
+            let end = std::cmp::min(task_shard.end_line, lines.len());
+
+            println!("--- {}:{} ---", file_path, task_shard.start_line);
+            for line in &lines[start..end] {
+                println!("{}", line);
+            }
+            println!();
+        }
+    }
+
+    Ok(())
+}
diff --git a/src/cli/mod.rs b/src/cli/mod.rs
new file mode 100644
index 0000000..6fdae80
--- /dev/null
+++ b/src/cli/mod.rs
@@ -0,0 +1,4 @@
+pub mod args;
+pub mod commands;
+
+pub use args::{Cli, Commands};
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..385ecb1
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,44 @@
+use directories::ProjectDirs;
+use serde::{Deserialize, Serialize};
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+use crate::error::StreamdError;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Settings {
+    pub base_folder: String,
+}
+
+impl Default for Settings {
+    fn default() -> Self {
+        Self {
+            base_folder: env::current_dir()
+                .map(|p| p.to_string_lossy().to_string())
+                .unwrap_or_else(|_| ".".to_string()),
+        }
+    }
+}
+
+impl Settings {
+    pub fn load() -> Result<Self, StreamdError> {
+        let config_path = Self::config_path();
+
+        if config_path.exists() {
+            let content = fs::read_to_string(&config_path)?;
+            let settings: Settings = serde_yaml::from_str(&content)?;
+            Ok(settings)
+        } else {
+            Ok(Settings::default())
+        }
+    }
+
+    fn config_path() -> PathBuf {
+        if let Some(proj_dirs) = ProjectDirs::from("", "", "streamd") {
+            proj_dirs.config_dir().join("config.yaml")
+        } else {
+            PathBuf::from("~/.config/streamd/config.yaml")
+        }
+    }
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..f180b35
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,25 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum StreamdError {
+    #[error("Could not extract date from file name: {0}")]
+    DateExtractionError(String),
+
+    #[error("Timesheet error: {0}")]
+    TimesheetError(String),
+
+    #[error("Configuration error: {0}")]
+    ConfigError(String),
+
+    #[error("IO error: {0}")]
+    IoError(#[from] std::io::Error),
+
+    #[error("YAML error: {0}")]
+    YamlError(#[from] serde_yaml::Error),
+}
+
+impl From<StreamdError> for miette::Report {
+    fn from(err: StreamdError) -> Self {
+        miette::Report::msg(err.to_string())
+    }
+}
diff --git a/src/extract/mod.rs b/src/extract/mod.rs
new file mode 100644
index 0000000..0df4bde
--- /dev/null
+++ b/src/extract/mod.rs
@@ -0,0 +1,5 @@
+mod parser;
+mod tag_extraction;
+
+pub use parser::parse_markdown_file;
+pub use tag_extraction::{extract_markers_and_tags, has_markers};
diff --git a/src/extract/parser.rs b/src/extract/parser.rs
new file mode 100644
index 0000000..1326371
--- /dev/null
+++ b/src/extract/parser.rs
@@ -0,0 +1,739 @@
+use std::collections::HashMap;
+
+use pulldown_cmark::{Event, HeadingLevel, Options, Parser, Tag, TagEnd};
+
+use crate::extract::tag_extraction::{extract_markers_and_tags, has_markers};
+use crate::models::{Shard, StreamFile};
+
+/// Information about a block element.
+#[derive(Debug, Clone)]
+struct BlockInfo {
+    start_line: usize,
+    end_line: usize,
+    block_type: BlockType,
+    events: Vec<Event<'static>>,
+}
+
+#[derive(Debug, Clone, PartialEq)]
+enum BlockType {
+    Paragraph,
+    Heading(usize),
+    List,
+    ListItem,
+    CodeBlock,
+    #[allow(dead_code)]
+    Other,
+}
+
+/// Build a shard, applying simplification rules.
+/// If the shard has exactly one child with the same line range and no markers/tags,
+/// return that child instead.
+fn build_shard(
+    start_line: usize,
+    end_line: usize,
+    markers: Vec<String>,
+    tags: Vec<String>,
+    children: Vec<Shard>,
+) -> Shard {
+    if children.len() == 1
+        && tags.is_empty()
+        && markers.is_empty()
+        && children[0].start_line == start_line
+        && children[0].end_line == end_line
+    {
+        return children.into_iter().next().unwrap();
+    }
+
+    Shard {
+        markers,
+        tags,
+        start_line,
+        end_line,
+        children,
+    }
+}
+
+/// Merge shards where the first one becomes the parent with its markers/tags preserved.
+fn merge_into_first_shard(
+    mut shards: Vec<Shard>,
+    start_line: usize,
+    end_line: usize,
+    additional_tags: Vec<String>,
+) -> Shard {
+    if shards.is_empty() {
+        return build_shard(start_line, end_line, vec![], additional_tags, vec![]);
+    }
+
+    let mut first = shards.remove(0);
+    first.start_line = start_line;
+    first.end_line = end_line;
+    first.children = shards;
+    first.tags.extend(additional_tags);
+    first
+}
+
+/// Parse a markdown file into a StreamFile with shard structure.
+pub fn parse_markdown_file(file_name: &str, file_content: &str) -> StreamFile {
+    let line_count = std::cmp::max(file_content.lines().count(), 1);
+    let end_line = line_count;
+
+    // Handle empty file
+    if file_content.is_empty() {
+        return StreamFile {
+            file_name: file_name.to_string(),
+            shard: Some(Shard::new(1, 1)),
+        };
+    }
+
+    // Parse the markdown with offset tracking
+    let mut options = Options::empty();
+    options.insert(Options::ENABLE_STRIKETHROUGH);
+    let parser = Parser::new_ext(file_content, options);
+
+    // Collect blocks with their line information
+    let blocks = collect_blocks(file_content, parser);
+
+    // Parse into shard structure
+    let shard = if blocks.is_empty() {
+        Shard::new(1, end_line)
+    } else {
+        parse_header_shards(&blocks, 1, end_line, false).unwrap_or_else(|| Shard::new(1, end_line))
+    };
+
+    StreamFile {
+        file_name: file_name.to_string(),
+        shard: Some(shard),
+    }
+}
+
+/// Collect block-level elements from the parser.
+fn collect_blocks(content: &str, parser: Parser) -> Vec<BlockInfo> {
+    let mut blocks = Vec::new();
+    let mut current_block: Option<BlockInfo> = None;
+    let _current_events: Vec<Event<'static>> = Vec::new();
+    let mut depth = 0;
+    let mut list_items: Vec<BlockInfo> = Vec::new();
+    let mut in_list = false;
+    let mut list_start_line = 0;
+
+    // Pre-compute line starts for offset-to-line mapping
+    let line_starts: Vec<usize> = std::iter::once(0)
+        .chain(content.match_indices('\n').map(|(i, _)| i + 1))
+        .collect();
+
+    let offset_to_line =
+        |offset: usize| -> usize { line_starts.partition_point(|&start| start <= offset) };
+
+    for (event, range) in parser.into_offset_iter() {
+        let line = offset_to_line(range.start);
+
+        match &event {
+            Event::Start(Tag::Paragraph) => {
+                if depth == 0 {
+                    current_block = Some(BlockInfo {
+                        start_line: line,
+                        end_line: line,
+                        block_type: BlockType::Paragraph,
+                        events: Vec::new(),
+                    });
+                }
+                depth += 1;
+                if let Some(ref mut block) = current_block {
+                    block.events.push(event.clone().into_static());
+                }
+            }
+            Event::End(TagEnd::Paragraph) => {
+                depth -= 1;
+                if let Some(ref mut block) = current_block {
+                    block.events.push(event.clone().into_static());
+                    block.end_line = line;
+                }
+                if depth == 0 {
+                    if let Some(block) = current_block.take() {
+                        if in_list {
+                            list_items.push(block);
+                        } else {
+                            blocks.push(block);
+                        }
+                    }
+                }
+            }
+            Event::Start(Tag::Heading { level, .. }) => {
+                let heading_level = heading_level_to_usize(*level);
+                if depth == 0 {
+                    current_block = Some(BlockInfo {
+                        start_line: line,
+                        end_line: line,
+                        block_type: BlockType::Heading(heading_level),
+                        events: Vec::new(),
+                    });
+                }
+                depth += 1;
+                if let Some(ref mut block) = current_block {
+                    block.events.push(event.clone().into_static());
+                }
+            }
+            Event::End(TagEnd::Heading(_)) => {
+                depth -= 1;
+                if let Some(ref mut block) = current_block {
+                    block.events.push(event.clone().into_static());
+                    block.end_line = line;
+                }
+                if depth == 0 {
+                    if let Some(block) = current_block.take() {
+                        blocks.push(block);
+                    }
+                }
+            }
+            Event::Start(Tag::List(_)) => {
+                if !in_list {
+                    in_list = true;
+                    list_start_line = line;
+                    list_items.clear();
+                }
+                depth += 1;
+            }
+            Event::End(TagEnd::List(_)) => {
+                depth -= 1;
+                if depth == 0 && in_list {
+                    in_list = false;
+                    // Create a list block containing all list items
+                    if !list_items.is_empty() {
+                        blocks.push(BlockInfo {
+                            start_line: list_start_line,
+                            end_line: line,
+                            block_type: BlockType::List,
+                            events: vec![], // List events are handled through list_items
+                        });
+                        // Store list items for later processing
+                        for item in list_items.drain(..) {
+                            blocks.push(BlockInfo {
+                                block_type: BlockType::ListItem,
+                                ..item
+                            });
+                        }
+                    }
+                }
+            }
+            Event::Start(Tag::Item) => {
+                if in_list {
+                    current_block = Some(BlockInfo {
+                        start_line: line,
+                        end_line: line,
+                        block_type: BlockType::ListItem,
+                        events: Vec::new(),
+                    });
+                }
+            }
+            Event::End(TagEnd::Item) => {
+                if let Some(ref mut block) = current_block {
+                    block.end_line = line;
+                }
+                if let Some(block) = current_block.take() {
+                    list_items.push(block);
+                }
+            }
+            Event::Start(Tag::CodeBlock(_)) => {
+                if depth == 0 {
+                    current_block = Some(BlockInfo {
+                        start_line: line,
+                        end_line: line,
+                        block_type: BlockType::CodeBlock,
+                        events: Vec::new(),
+                    });
+                }
+                depth += 1;
+                if let Some(ref mut block) = current_block {
+                    block.events.push(event.clone().into_static());
+                }
+            }
+            Event::End(TagEnd::CodeBlock) => {
+                depth -= 1;
+                if let Some(ref mut block) = current_block {
+                    block.events.push(event.clone().into_static());
+                    block.end_line = line;
+                }
+                if depth == 0 {
+                    if let Some(block) = current_block.take() {
+                        blocks.push(block);
+                    }
+                }
+            }
+            _ => {
+                if let Some(ref mut block) = current_block {
+                    block.events.push(event.clone().into_static());
+                }
+            }
+        }
+    }
+
+    blocks
+}
+
+fn heading_level_to_usize(level: HeadingLevel) -> usize {
+    match level {
+        HeadingLevel::H1 => 1,
+        HeadingLevel::H2 => 2,
+        HeadingLevel::H3 => 3,
+        HeadingLevel::H4 => 4,
+        HeadingLevel::H5 => 5,
+        HeadingLevel::H6 => 6,
+    }
+}
+
+/// Check if a block has markers.
+fn block_has_markers(block: &BlockInfo) -> bool {
+    has_markers(block.events.iter().cloned())
+}
+
+/// Extract markers and tags from a block.
+fn extract_block_markers_and_tags(block: &BlockInfo) -> (Vec<String>, Vec<String>) {
+    extract_markers_and_tags(block.events.iter().cloned())
+}
+
+/// Find positions of paragraph blocks that have markers.
+fn find_paragraph_shard_positions(blocks: &[BlockInfo]) -> Vec<usize> {
+    blocks
+        .iter()
+        .enumerate()
+        .filter(|(_, block)| block.block_type == BlockType::Paragraph && block_has_markers(block))
+        .map(|(i, _)| i)
+        .collect()
+}
+
+/// Find positions of headings at a specific level.
+fn find_headings_by_level(blocks: &[BlockInfo], level: usize) -> Vec<usize> {
+    blocks
+        .iter()
+        .enumerate()
+        .filter(|(_, block)| matches!(block.block_type, BlockType::Heading(l) if l == level))
+        .map(|(i, _)| i)
+        .collect()
+}
+
+/// Calculate the heading level to split on for the next parsing step.
+fn calculate_heading_level_for_next_split(blocks: &[BlockInfo]) -> Option<usize> {
+    // Find heading levels that have markers (excluding first block)
+    let levels_with_markers: Vec<usize> = blocks[1..]
+        .iter()
+        .filter_map(|block| {
+            if let BlockType::Heading(level) = block.block_type {
+                if block_has_markers(block) {
+                    return Some(level);
+                }
+            }
+            None
+        })
+        .collect();
+
+    if levels_with_markers.is_empty() {
+        return None;
+    }
+
+    // Count headings at each level
+    let mut level_counts: HashMap<usize, usize> = HashMap::new();
+    for block in blocks {
+        if let BlockType::Heading(level) = block.block_type {
+            *level_counts.entry(level).or_insert(0) += 1;
+        }
+    }
+
+    // Return the minimum level that either:
+    // - Has count >= 2
+    // - Has a marker (excluding first block)
+    let levels_with_multiple: Vec<usize> = level_counts
+        .into_iter()
+        .filter(|(_, count)| *count >= 2)
+        .map(|(level, _)| level)
+        .collect();
+
+    let mut candidates = levels_with_multiple;
+    candidates.extend(levels_with_markers);
+
+    candidates.into_iter().min()
+}
+
+/// Split a slice at the given positions.
+fn split_at<T: Clone>(items: &[T], positions: &[usize]) -> Vec<Vec<T>> {
+    let mut all_positions: Vec<usize> = vec![0];
+    all_positions.extend(positions.iter().cloned());
+    all_positions.push(items.len());
+    all_positions.sort();
+    all_positions.dedup();
+
+    all_positions
+        .windows(2)
+        .map(|window| items[window[0]..window[1]].to_vec())
+        .filter(|v| !v.is_empty())
+        .collect()
+}
+
+/// Parse blocks into shard hierarchy based on headings.
+fn parse_header_shards(
+    blocks: &[BlockInfo],
+    start_line: usize,
+    end_line: usize,
+    use_first_child_as_header: bool,
+) -> Option<Shard> {
+    if blocks.is_empty() {
+        return Some(build_shard(start_line, end_line, vec![], vec![], vec![]));
+    }
+
+    let split_at_heading_level = calculate_heading_level_for_next_split(blocks);
+
+    if split_at_heading_level.is_none() {
+        return parse_multiple_block_shards(blocks, start_line, end_line, true).0;
+    }
+
+    let heading_level = split_at_heading_level.unwrap();
+    let heading_positions = find_headings_by_level(blocks, heading_level);
+    let block_groups = split_at(blocks, &heading_positions);
+
+    let mut children = Vec::new();
+
+    for (i, group) in block_groups.iter().enumerate() {
+        if group.is_empty() {
+            continue;
+        }
+
+        let child_start_line = group[0].start_line;
+        let child_end_line = if i + 1 < block_groups.len() && !block_groups[i + 1].is_empty() {
+            block_groups[i + 1][0].start_line - 1
+        } else {
+            end_line
+        };
+
+        if let Some(child_shard) = parse_header_shards(
+            group,
+            child_start_line,
+            child_end_line,
+            i > 0 || heading_positions.contains(&0),
+        ) {
+            children.push(child_shard);
+        }
+    }
+
+    if use_first_child_as_header && !children.is_empty() {
+        Some(merge_into_first_shard(
+            children,
+            start_line,
+            end_line,
+            vec![],
+        ))
+    } else {
+        Some(build_shard(start_line, end_line, vec![], vec![], children))
+    }
+}
+
+/// Parse multiple blocks into shards.
+fn parse_multiple_block_shards(
+    blocks: &[BlockInfo],
+    start_line: usize,
+    end_line: usize,
+    enforce_shard: bool,
+) -> (Option<Shard>, Vec<String>) {
+    if blocks.is_empty() {
+        if enforce_shard {
+            return (
+                Some(build_shard(start_line, end_line, vec![], vec![], vec![])),
+                vec![],
+            );
+        }
+        return (None, vec![]);
+    }
+
+    let is_first_block_heading =
+        matches!(blocks[0].block_type, BlockType::Heading(_)) && block_has_markers(&blocks[0]);
+
+    let paragraph_positions = find_paragraph_shard_positions(blocks);
+    let mut children = Vec::new();
+    let mut tags = Vec::new();
+    let mut is_first_block_only_with_marker = false;
+
+    for (i, block) in blocks.iter().enumerate() {
+        if paragraph_positions.contains(&i) {
+            is_first_block_only_with_marker = i == 0;
+        }
+
+        let child_start_line = block.start_line;
+        let child_end_line = if i + 1 < blocks.len() {
+            blocks[i + 1].start_line - 1
+        } else {
+            end_line
+        };
+
+        let (child_shard, child_tags) =
+            parse_single_block_shard(block, child_start_line, child_end_line);
+
+        if let Some(shard) = child_shard {
+            children.push(shard);
+        }
+        tags.extend(child_tags);
+    }
+
+    if children.is_empty() && !enforce_shard {
+        return (None, tags);
+    }
+
+    if is_first_block_heading || is_first_block_only_with_marker {
+        (
+            Some(merge_into_first_shard(children, start_line, end_line, tags)),
+            vec![],
+        )
+    } else {
+        (
+            Some(build_shard(start_line, end_line, vec![], tags, children)),
+            vec![],
+        )
+    }
+}
+
+/// Parse a single block into a shard.
+fn parse_single_block_shard(
+    block: &BlockInfo,
+    start_line: usize,
+    end_line: usize,
+) -> (Option<Shard>, Vec<String>) {
+    match block.block_type {
+        BlockType::Paragraph | BlockType::Heading(_) => {
+            let (markers, tags) = extract_block_markers_and_tags(block);
+            if markers.is_empty() {
+                (None, tags)
+            } else {
+                (
+                    Some(build_shard(start_line, end_line, markers, tags, vec![])),
+                    vec![],
+                )
+            }
+        }
+        BlockType::List | BlockType::ListItem => {
+            // List handling is complex - for now, extract any markers/tags
+            let (markers, tags) = extract_block_markers_and_tags(block);
+            if markers.is_empty() {
+                (None, tags)
+            } else {
+                (
+                    Some(build_shard(start_line, end_line, markers, tags, vec![])),
+                    vec![],
+                )
+            }
+        }
+        _ => (None, vec![]),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn make_file_name() -> String {
+        "test.md".to_string()
+    }
+
+    #[test]
+    fn test_parse_empty_file() {
+        let result = parse_markdown_file(&make_file_name(), "");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard::new(1, 1)),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_basic_one_line_file() {
+        let result = parse_markdown_file(&make_file_name(), "Hello World");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard::new(1, 1)),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_basic_multi_line_file() {
+        let result = parse_markdown_file(&make_file_name(), "Hello World\n\nHello again!");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard::new(1, 3)),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_single_line_with_tag() {
+        let result = parse_markdown_file(&make_file_name(), "@Tag Hello World");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["Tag".to_string()],
+                    tags: vec![],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_single_line_with_two_tags() {
+        let result = parse_markdown_file(&make_file_name(), "@Marker1 @Marker2 Hello World");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["Marker1".to_string(), "Marker2".to_string()],
+                    tags: vec![],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_single_line_with_two_tags_and_misplaced_tag() {
+        let result = parse_markdown_file(&make_file_name(), "@Tag1 @Tag2 Hello World @Tag3");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["Tag1".to_string(), "Tag2".to_string()],
+                    tags: vec!["Tag3".to_string()],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_header_without_markers() {
+        let result = parse_markdown_file(&make_file_name(), "# Heading\n\n## Subheading");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard::new(1, 3)),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_ignores_tags_in_code() {
+        let result = parse_markdown_file(&make_file_name(), "```\n@Marker\n```");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard::new(1, 3)),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_finds_tags_in_italic_text() {
+        let result = parse_markdown_file(&make_file_name(), "*@ItalicMarker*");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["ItalicMarker".to_string()],
+                    tags: vec![],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_finds_tags_in_bold_text() {
+        let result = parse_markdown_file(&make_file_name(), "**@BoldMarker**");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["BoldMarker".to_string()],
+                    tags: vec![],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_finds_tags_in_strikethrough_text() {
+        let result = parse_markdown_file(&make_file_name(), "~~@StrikeMarker~~");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["StrikeMarker".to_string()],
+                    tags: vec![],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_finds_tags_in_link() {
+        let result = parse_markdown_file(&make_file_name(), "[@LinkMarker](https://example.com)");
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["LinkMarker".to_string()],
+                    tags: vec![],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_continues_looking_for_markers_after_first_link_marker() {
+        let result = parse_markdown_file(
+            &make_file_name(),
+            "[@LinkMarker1](https://example.com) [@LinkMarker2](https://example.com)",
+        );
+        assert_eq!(
+            result,
+            StreamFile {
+                file_name: make_file_name(),
+                shard: Some(Shard {
+                    markers: vec!["LinkMarker1".to_string(), "LinkMarker2".to_string()],
+                    tags: vec![],
+                    start_line: 1,
+                    end_line: 1,
+                    children: vec![],
+                }),
+            }
+        );
+    }
+}
diff --git a/src/extract/tag_extraction.rs b/src/extract/tag_extraction.rs
new file mode 100644
index 0000000..f118156
--- /dev/null
+++ b/src/extract/tag_extraction.rs
@@ -0,0 +1,219 @@
+use once_cell::sync::Lazy;
+use pulldown_cmark::{Event, Tag, TagEnd};
+use regex::Regex;
+
+/// Regex pattern for matching @Tags.
+/// Matches @ followed by any characters except whitespace, *, `, ~, [, ]
+static TAG_PATTERN: Lazy<Regex> = Lazy::new(|| Regex::new(r"@([^\s*`~\[\]]+)").unwrap());
+
+/// Token type for tag extraction state machine.
+#[derive(Debug, Clone)]
+enum Token {
+    Tag(String),
+    Content,
+    Whitespace,
+}
+
+/// Tokenizes text content into Tags, Content, and Whitespace tokens.
+fn tokenize(text: &str) -> Vec<Token> {
+    let mut tokens = Vec::new();
+    let mut last_end = 0;
+
+    for mat in TAG_PATTERN.find_iter(text) {
+        // Handle content before the match
+        let before = &text[last_end..mat.start()];
+        if !before.is_empty() {
+            if before.chars().all(|c| c.is_whitespace()) {
+                tokens.push(Token::Whitespace);
+            } else {
+                tokens.push(Token::Content);
+            }
+        }
+
+        // Extract the tag name (without the @)
+        let tag_name = &text[mat.start() + 1..mat.end()];
+        tokens.push(Token::Tag(tag_name.to_string()));
+        last_end = mat.end();
+    }
+
+    // Handle remaining content after last match
+    if last_end < text.len() {
+        let remaining = &text[last_end..];
+        if !remaining.is_empty() {
+            if remaining.chars().all(|c| c.is_whitespace()) {
+                tokens.push(Token::Whitespace);
+            } else {
+                tokens.push(Token::Content);
+            }
+        }
+    }
+
+    tokens
+}
+
+/// Extract markers and tags from a sequence of pulldown-cmark events.
+///
+/// Markers are @-prefixed identifiers that appear before any non-whitespace content.
+/// Tags are @-prefixed identifiers that appear after content has started.
+///
+/// Returns (markers, tags).
+pub fn extract_markers_and_tags<'a>(
+    events: impl Iterator<Item = Event<'a>>,
+) -> (Vec<String>, Vec<String>) {
+    let mut markers = Vec::new();
+    let mut tags = Vec::new();
+    let mut boundary_crossed = false;
+    let mut in_code = false;
+
+    for event in events {
+        match event {
+            Event::Start(Tag::CodeBlock(_)) | Event::Start(Tag::MetadataBlock(_)) => {
+                in_code = true;
+            }
+            Event::End(TagEnd::CodeBlock) | Event::End(TagEnd::MetadataBlock(_)) => {
+                in_code = false;
+            }
+            Event::Code(_) => {
+                // Inline code is a content boundary but we don't extract tags from it
+                boundary_crossed = true;
+            }
+            Event::Text(text) | Event::InlineHtml(text) if !in_code => {
+                for token in tokenize(&text) {
+                    match token {
+                        Token::Whitespace => {}
+                        Token::Tag(name) => {
+                            if boundary_crossed {
+                                tags.push(name);
+                            } else {
+                                markers.push(name);
+                            }
+                        }
+                        Token::Content => {
+                            boundary_crossed = true;
+                        }
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+
+    (markers, tags)
+}
+
+/// Check if the events contain any markers (tags before content).
+pub fn has_markers<'a>(events: impl Iterator<Item = Event<'a>>) -> bool {
+    let (markers, _) = extract_markers_and_tags(events);
+    !markers.is_empty()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use pulldown_cmark::Parser;
+
+    fn extract_from_text(text: &str) -> (Vec<String>, Vec<String>) {
+        let mut options = pulldown_cmark::Options::empty();
+        options.insert(pulldown_cmark::Options::ENABLE_STRIKETHROUGH);
+        let parser = Parser::new_ext(text, options);
+        extract_markers_and_tags(parser)
+    }
+
+    #[test]
+    fn test_extract_single_marker() {
+        let (markers, tags) = extract_from_text("@Tag Hello World");
+        assert_eq!(markers, vec!["Tag"]);
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_extract_two_markers() {
+        let (markers, tags) = extract_from_text("@Marker1 @Marker2 Hello World");
+        assert_eq!(markers, vec!["Marker1", "Marker2"]);
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_extract_markers_and_tags() {
+        let (markers, tags) = extract_from_text("@Tag1 @Tag2 Hello World @Tag3");
+        assert_eq!(markers, vec!["Tag1", "Tag2"]);
+        assert_eq!(tags, vec!["Tag3"]);
+    }
+
+    #[test]
+    fn test_extract_inner_tags() {
+        let (markers, tags) = extract_from_text("Hello @Tag1 World!");
+        assert!(markers.is_empty());
+        assert_eq!(tags, vec!["Tag1"]);
+    }
+
+    #[test]
+    fn test_extract_ignores_code_blocks() {
+        let (markers, tags) = extract_from_text("```\n@Marker\n```");
+        assert!(markers.is_empty());
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_extract_italic_marker() {
+        let (markers, tags) = extract_from_text("*@ItalicMarker*");
+        assert_eq!(markers, vec!["ItalicMarker"]);
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_extract_bold_marker() {
+        let (markers, tags) = extract_from_text("**@BoldMarker**");
+        assert_eq!(markers, vec!["BoldMarker"]);
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_extract_strikethrough_marker() {
+        let (markers, tags) = extract_from_text("~~@StrikeMarker~~");
+        assert_eq!(markers, vec!["StrikeMarker"]);
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_extract_link_marker() {
+        let (markers, tags) = extract_from_text("[@LinkMarker](https://example.com)");
+        assert_eq!(markers, vec!["LinkMarker"]);
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_extract_multiple_link_markers() {
+        let (markers, tags) = extract_from_text(
+            "[@LinkMarker1](https://example.com) [@LinkMarker2](https://example.com)",
+        );
+        assert_eq!(markers, vec!["LinkMarker1", "LinkMarker2"]);
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_has_markers_true() {
+        let parser = Parser::new("@Tag Hello");
+        assert!(has_markers(parser));
+    }
+
+    #[test]
+    fn test_has_markers_false() {
+        let parser = Parser::new("Hello @Tag");
+        assert!(!has_markers(parser));
+    }
+
+    #[test]
+    fn test_empty_text() {
+        let (markers, tags) = extract_from_text("");
+        assert!(markers.is_empty());
+        assert!(tags.is_empty());
+    }
+
+    #[test]
+    fn test_no_tags() {
+        let (markers, tags) = extract_from_text("Hello World");
+        assert!(markers.is_empty());
+        assert!(tags.is_empty());
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..6b9a3dd
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,14 @@
+pub mod cli;
+pub mod config;
+pub mod error;
+pub mod extract;
+pub mod localize;
+pub mod models;
+pub mod query;
+pub mod timesheet;
+
+pub use error::StreamdError;
+pub use models::{
+    Dimension, LocalizedShard, Marker, MarkerPlacement, RepositoryConfiguration, Shard,
+    SpecialDayType, StreamFile, Timecard, Timesheet,
+};
diff --git a/src/localize/configuration.rs b/src/localize/configuration.rs
new file mode 100644
index 0000000..df30561
--- /dev/null
+++ b/src/localize/configuration.rs
@@ -0,0 +1,448 @@
+use std::collections::BTreeSet;
+
+use indexmap::IndexMap;
+
+use crate::models::{Dimension, Marker, MarkerPlacement, RepositoryConfiguration};
+
+/// Merge two dimensions, with the second taking precedence.
+///
+/// - display_name: second wins if non-empty, else base
+/// - comment: second wins if not None, else base
+/// - propagate: second wins if explicitly set, else base
+pub fn merge_single_dimension(base: &Dimension, second: &Dimension) -> Dimension {
+    Dimension {
+        display_name: if second.display_name.is_empty() {
+            base.display_name.clone()
+        } else {
+            second.display_name.clone()
+        },
+        comment: if second.comment.is_some() {
+            second.comment.clone()
+        } else {
+            base.comment.clone()
+        },
+        propagate: if second.propagate_was_set {
+            second.propagate
+        } else {
+            base.propagate
+        },
+        propagate_was_set: second.propagate_was_set || base.propagate_was_set,
+    }
+}
+
+/// Merge two dimension maps.
+pub fn merge_dimensions(
+    base: &IndexMap<String, Dimension>,
+    second: &IndexMap<String, Dimension>,
+) -> IndexMap<String, Dimension> {
+    let mut merged = base.clone();
+
+    for (key, second_dim) in second {
+        if let Some(base_dim) = merged.get(key) {
+            merged.insert(key.clone(), merge_single_dimension(base_dim, second_dim));
+        } else {
+            merged.insert(key.clone(), second_dim.clone());
+        }
+    }
+
+    merged
+}
+
+/// Create a placement identity tuple for deduplication.
+/// We use BTreeSet to make it hashable and order-independent.
+fn placement_identity(p: &MarkerPlacement) -> (BTreeSet<String>, String) {
+    (p.if_with.iter().cloned().collect(), p.dimension.clone())
+}
+
+/// Merge two markers, with the second taking precedence.
+pub fn merge_single_marker(base: &Marker, second: &Marker) -> Marker {
+    let display_name = if second.display_name.is_empty() {
+        base.display_name.clone()
+    } else {
+        second.display_name.clone()
+    };
+
+    let mut merged_placements: Vec<MarkerPlacement> = Vec::new();
+    let mut seen: IndexMap<(BTreeSet<String>, String), usize> = IndexMap::new();
+
+    for placement in &base.placements {
+        let ident = placement_identity(placement);
+        seen.insert(ident, merged_placements.len());
+        merged_placements.push(placement.clone());
+    }
+
+    for placement in &second.placements {
+        let ident = placement_identity(placement);
+        if let Some(&idx) = seen.get(&ident) {
+            merged_placements[idx] = placement.clone();
+        } else {
+            seen.insert(ident, merged_placements.len());
+            merged_placements.push(placement.clone());
+        }
+    }
+
+    Marker {
+        display_name,
+        placements: merged_placements,
+    }
+}
+
+/// Merge two marker maps.
+pub fn merge_markers(
+    base: &IndexMap<String, Marker>,
+    second: &IndexMap<String, Marker>,
+) -> IndexMap<String, Marker> {
+    let mut merged = base.clone();
+
+    for (key, second_marker) in second {
+        if let Some(base_marker) = merged.get(key) {
+            merged.insert(key.clone(), merge_single_marker(base_marker, second_marker));
+        } else {
+            merged.insert(key.clone(), second_marker.clone());
+        }
+    }
+
+    merged
+}
+
+/// Merge two repository configurations.
+pub fn merge_repository_configuration(
+    base: &RepositoryConfiguration,
+    second: &RepositoryConfiguration,
+) -> RepositoryConfiguration {
+    RepositoryConfiguration {
+        dimensions: merge_dimensions(&base.dimensions, &second.dimensions),
+        markers: merge_markers(&base.markers, &second.markers),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_second_overrides_display_name_when_non_empty() {
+        let base = Dimension::new("Base")
+            .with_comment("c1")
+            .with_propagate(true);
+        let second = Dimension::new("Second")
+            .with_comment("c2")
+            .with_propagate(false);
+
+        let merged = merge_single_dimension(&base, &second);
+
+        assert_eq!(merged.display_name, "Second");
+        assert_eq!(merged.comment, Some("c2".to_string()));
+        assert!(!merged.propagate);
+    }
+
+    #[test]
+    fn test_second_empty_display_name_falls_back_to_base() {
+        let base = Dimension::new("Base")
+            .with_comment("c1")
+            .with_propagate(true);
+        let second = Dimension::new("").with_comment("c2").with_propagate(false);
+
+        let merged = merge_single_dimension(&base, &second);
+
+        assert_eq!(merged.display_name, "Base");
+        assert_eq!(merged.comment, Some("c2".to_string()));
+        assert!(!merged.propagate);
+    }
+
+    #[test]
+    fn test_second_comment_none_does_not_erase_base_comment() {
+        let base = Dimension::new("Base")
+            .with_comment("keep")
+            .with_propagate(true);
+        let mut second = Dimension::new("Second");
+        second.propagate = false;
+        second.propagate_was_set = true;
+
+        let merged = merge_single_dimension(&base, &second);
+
+        assert_eq!(merged.display_name, "Second");
+        assert_eq!(merged.comment, Some("keep".to_string()));
+    }
+
+    #[test]
+    fn test_second_comment_non_none_overrides_base_comment() {
+        let base = Dimension::new("Base")
+            .with_comment("c1")
+            .with_propagate(true);
+        let second = Dimension::new("Second")
+            .with_comment("c2")
+            .with_propagate(true);
+
+        let merged = merge_single_dimension(&base, &second);
+
+        assert_eq!(merged.comment, Some("c2".to_string()));
+    }
+
+    #[test]
+    fn test_second_propagate_overrides_base_when_provided() {
+        let base = Dimension::new("Base")
+            .with_comment("c1")
+            .with_propagate(true);
+        let second = Dimension::new("Second")
+            .with_comment("c2")
+            .with_propagate(false);
+
+        let merged = merge_single_dimension(&base, &second);
+
+        assert!(!merged.propagate);
+    }
+
+    #[test]
+    fn test_propagate_merging_retains_base_when_second_not_provided() {
+        let base = Dimension::new("Base")
+            .with_comment("c1")
+            .with_propagate(true);
+        let second = Dimension::new("Second").with_comment("c2");
+
+        let merged = merge_single_dimension(&base, &second);
+
+        assert!(merged.propagate);
+    }
+
+    #[test]
+    fn test_adds_new_keys_from_second() {
+        let mut base = IndexMap::new();
+        base.insert("a".to_string(), Dimension::new("A").with_propagate(true));
+
+        let mut second = IndexMap::new();
+        second.insert("b".to_string(), Dimension::new("B").with_propagate(false));
+
+        let merged = merge_dimensions(&base, &second);
+
+        assert!(merged.contains_key("a"));
+        assert!(merged.contains_key("b"));
+        assert_eq!(merged["a"].display_name, "A");
+        assert_eq!(merged["b"].display_name, "B");
+    }
+
+    #[test]
+    fn test_merges_existing_keys() {
+        let mut base = IndexMap::new();
+        base.insert(
+            "a".to_string(),
+            Dimension::new("A").with_comment("c1").with_propagate(true),
+        );
+
+        let mut second = IndexMap::new();
+        second.insert("a".to_string(), Dimension::new("A2").with_propagate(false));
+
+        let merged = merge_dimensions(&base, &second);
+
+        assert_eq!(merged["a"].display_name, "A2");
+        assert_eq!(merged["a"].comment, Some("c1".to_string()));
+        assert!(!merged["a"].propagate);
+    }
+
+    #[test]
+    fn test_does_not_mutate_inputs() {
+        let mut base = IndexMap::new();
+        base.insert(
+            "a".to_string(),
+            Dimension::new("A").with_comment("c1").with_propagate(true),
+        );
+
+        let mut second = IndexMap::new();
+        second.insert(
+            "b".to_string(),
+            Dimension::new("B").with_comment("c2").with_propagate(false),
+        );
+
+        let merged = merge_dimensions(&base, &second);
+
+        assert!(!base.contains_key("b"));
+        assert!(!second.contains_key("a"));
+        assert!(merged.contains_key("a"));
+        assert!(merged.contains_key("b"));
+    }
+
+    #[test]
+    fn test_second_marker_overrides_display_name_when_non_empty() {
+        let base = Marker::new("Base").with_placements(vec![MarkerPlacement::new("project")]);
+        let second = Marker::new("Second")
+            .with_placements(vec![MarkerPlacement::new("timesheet").with_value("coding")]);
+
+        let merged = merge_single_marker(&base, &second);
+
+        assert_eq!(merged.display_name, "Second");
+        assert_eq!(merged.placements.len(), 2);
+        assert_eq!(merged.placements[0].dimension, "project");
+        assert_eq!(merged.placements[1].dimension, "timesheet");
+    }
+
+    #[test]
+    fn test_second_marker_empty_display_name_falls_back_to_base() {
+        let base = Marker::new("Base").with_placements(vec![]);
+        let second = Marker::new("").with_placements(vec![]);
+
+        let merged = merge_single_marker(&base, &second);
+
+        assert_eq!(merged.display_name, "Base");
+    }
+
+    #[test]
+    fn test_appends_new_placements() {
+        let base = Marker::new("Base").with_placements(vec![MarkerPlacement::new("project")]);
+        let second = Marker::new("Second").with_placements(vec![MarkerPlacement::new("timesheet")
+            .with_if_with(vec!["Timesheet"])
+            .with_value("x")]);
+
+        let merged = merge_single_marker(&base, &second);
+
+        assert_eq!(merged.placements.len(), 2);
+        assert_eq!(merged.placements[0].dimension, "project");
+        assert_eq!(merged.placements[1].dimension, "timesheet");
+    }
+
+    #[test]
+    fn test_deduplicates_by_identity_and_second_overrides_base() {
+        let base = Marker::new("Base").with_placements(vec![
+            MarkerPlacement::new("d")
+                .with_if_with(vec!["A"])
+                .with_value("v"),
+            MarkerPlacement::new("d")
+                .with_if_with(vec!["B"])
+                .with_value("v2"),
+        ]);
+        let second = Marker::new("Second").with_placements(vec![
+            MarkerPlacement::new("d")
+                .with_if_with(vec!["A"])
+                .with_value("v"),
+            MarkerPlacement::new("d")
+                .with_if_with(vec!["C"])
+                .with_value("v3"),
+        ]);
+
+        let merged = merge_single_marker(&base, &second);
+
+        assert_eq!(merged.placements.len(), 3);
+        // First placement (A, d) should be from second
+        assert_eq!(
+            merged.placements[0].if_with.iter().collect::<Vec<_>>(),
+            vec!["A"]
+        );
+        // Second placement (B, d) should be from base
+        assert_eq!(
+            merged.placements[1].if_with.iter().collect::<Vec<_>>(),
+            vec!["B"]
+        );
+        // Third placement (C, d) should be from second
+        assert_eq!(
+            merged.placements[2].if_with.iter().collect::<Vec<_>>(),
+            vec!["C"]
+        );
+    }
+
+    #[test]
+    fn test_identity_is_order_insensitive_for_if_with() {
+        let base = Marker::new("Base").with_placements(vec![MarkerPlacement::new("d")
+            .with_if_with(vec!["A", "B"])
+            .with_value("v")]);
+        let second = Marker::new("Second").with_placements(vec![MarkerPlacement::new("d")
+            .with_if_with(vec!["B", "A"])
+            .with_value("v2")]);
+
+        let merged = merge_single_marker(&base, &second);
+
+        // With if_with as a set, identity is order-insensitive; second overrides base.
+        assert_eq!(merged.placements.len(), 1);
+        assert_eq!(merged.placements[0].value, Some("v2".to_string()));
+    }
+
+    #[test]
+    fn test_adds_new_marker_keys_from_second() {
+        let mut base = IndexMap::new();
+        base.insert("M1".to_string(), Marker::new("M1").with_placements(vec![]));
+
+        let mut second = IndexMap::new();
+        second.insert("M2".to_string(), Marker::new("M2").with_placements(vec![]));
+
+        let merged = merge_markers(&base, &second);
+
+        assert!(merged.contains_key("M1"));
+        assert!(merged.contains_key("M2"));
+    }
+
+    #[test]
+    fn test_merges_existing_marker_keys() {
+        let mut base = IndexMap::new();
+        base.insert(
+            "M".to_string(),
+            Marker::new("Base").with_placements(vec![MarkerPlacement::new("project")]),
+        );
+
+        let mut second = IndexMap::new();
+        second.insert(
+            "M".to_string(),
+            Marker::new("Second").with_placements(vec![MarkerPlacement::new("timesheet")
+                .with_if_with(vec!["Timesheet"])
+                .with_value("coding")]),
+        );
+
+        let merged = merge_markers(&base, &second);
+
+        assert_eq!(merged["M"].display_name, "Second");
+        assert_eq!(merged["M"].placements.len(), 2);
+    }
+
+    #[test]
+    fn test_merge_repository_configuration() {
+        let base = RepositoryConfiguration::new()
+            .with_dimension(
+                "project",
+                Dimension::new("Project")
+                    .with_comment("c1")
+                    .with_propagate(true),
+            )
+            .with_dimension(
+                "moment",
+                Dimension::new("Moment")
+                    .with_comment("c2")
+                    .with_propagate(true),
+            )
+            .with_marker(
+                "Streamd",
+                Marker::new("Streamd").with_placements(vec![MarkerPlacement::new("project")]),
+            );
+
+        let second = RepositoryConfiguration::new()
+            .with_dimension("project", Dimension::new("Project2").with_propagate(false))
+            .with_dimension(
+                "timesheet",
+                Dimension::new("Timesheet")
+                    .with_comment("c3")
+                    .with_propagate(false),
+            )
+            .with_marker(
+                "Streamd",
+                Marker::new("Streamd2").with_placements(vec![MarkerPlacement::new("timesheet")
+                    .with_if_with(vec!["Timesheet"])
+                    .with_value("coding")]),
+            )
+            .with_marker(
+                "JobHunting",
+                Marker::new("JobHunting").with_placements(vec![MarkerPlacement::new("project")]),
+            );
+
+        let merged = merge_repository_configuration(&base, &second);
+
+        assert!(merged.dimensions.contains_key("project"));
+        assert!(merged.dimensions.contains_key("moment"));
+        assert!(merged.dimensions.contains_key("timesheet"));
+        assert_eq!(merged.dimensions["project"].display_name, "Project2");
+        assert_eq!(merged.dimensions["project"].comment, Some("c1".to_string()));
+        assert!(!merged.dimensions["project"].propagate);
+        assert_eq!(merged.dimensions["moment"].display_name, "Moment");
+        assert_eq!(merged.dimensions["timesheet"].display_name, "Timesheet");
+
+        assert!(merged.markers.contains_key("Streamd"));
+        assert!(merged.markers.contains_key("JobHunting"));
+        assert_eq!(merged.markers["Streamd"].display_name, "Streamd2");
+        assert_eq!(merged.markers["Streamd"].placements.len(), 2);
+    }
+}
diff --git a/src/localize/datetime.rs b/src/localize/datetime.rs
new file mode 100644
index 0000000..87a2718
--- /dev/null
+++ b/src/localize/datetime.rs
@@ -0,0 +1,365 @@
+use chrono::{DateTime, NaiveDate, NaiveDateTime, NaiveTime, Utc};
+use once_cell::sync::Lazy;
+use regex::Regex;
+use std::path::Path;
+
+/// Regex for extracting date and optional time from file names.
+/// Format: YYYYMMDD or YYYYMMDD-HHMMSS (time can be 4-6 digits)
+static FILE_NAME_REGEX: Lazy<Regex> =
+    Lazy::new(|| Regex::new(r"^(?P<date>\d{8})(?:-(?P<time>\d{4,6}))?.+\.md$").unwrap());
+
+/// Regex for validating datetime marker format (14 digits).
+static DATETIME_MARKER_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^\d{14}$").unwrap());
+
+/// Regex for validating date marker format (8 digits).
+static DATE_MARKER_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^\d{8}$").unwrap());
+
+/// Regex for validating time marker format (6 digits).
+static TIME_MARKER_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^\d{6}$").unwrap());
+
+/// Extract a datetime from a file name in the format YYYYMMDD-HHMMSS.
+///
+/// The time component is optional and can be 4-6 digits (HHMM, HHMMS, or HHMMSS).
+///
+/// # Examples
+/// - "20230101-123456 Some Text.md" -> DateTime for 2023-01-01 12:34:56
+/// - "20230101 Some Text.md" -> DateTime for 2023-01-01 00:00:00
+/// - "invalid-file-name.md" -> None
+pub fn extract_datetime_from_file_name(file_name: &str) -> Option<DateTime<Utc>> {
+    let base_name = Path::new(file_name)
+        .file_name()
+        .and_then(|s| s.to_str())
+        .unwrap_or(file_name);
+
+    let captures = FILE_NAME_REGEX.captures(base_name)?;
+    let date_str = captures.name("date")?.as_str();
+    let time_str = captures.name("time").map(|m| m.as_str()).unwrap_or("");
+
+    // Pad time string to 6 digits
+    let time_str = format!("{:0<6}", time_str);
+
+    let datetime_str = format!(
+        "{} {}:{}:{}",
+        date_str,
+        &time_str[0..2],
+        &time_str[2..4],
+        &time_str[4..6]
+    );
+
+    NaiveDateTime::parse_from_str(&datetime_str, "%Y%m%d %H:%M:%S")
+        .ok()
+        .map(|dt| dt.and_utc())
+}
+
+/// Extract a datetime from a marker string in the exact format: YYYYMMDDHHMMSS.
+///
+/// Returns the parsed datetime if the format matches and values are valid.
+pub fn extract_datetime_from_marker(marker: &str) -> Option<DateTime<Utc>> {
+    if !DATETIME_MARKER_REGEX.is_match(marker) {
+        return None;
+    }
+
+    NaiveDateTime::parse_from_str(marker, "%Y%m%d%H%M%S")
+        .ok()
+        .map(|dt| dt.and_utc())
+}
+
+/// Extract a date from a marker string in the exact format: YYYYMMDD.
+///
+/// Returns the parsed date if the format matches and values are valid.
+pub fn extract_date_from_marker(marker: &str) -> Option<NaiveDate> {
+    if !DATE_MARKER_REGEX.is_match(marker) {
+        return None;
+    }
+
+    NaiveDate::parse_from_str(marker, "%Y%m%d").ok()
+}
+
+/// Extract a time from a marker string in the exact format: HHMMSS.
+///
+/// Returns the parsed time if the format matches and values are valid.
+pub fn extract_time_from_marker(marker: &str) -> Option<NaiveTime> {
+    if !TIME_MARKER_REGEX.is_match(marker) {
+        return None;
+    }
+
+    NaiveTime::parse_from_str(marker, "%H%M%S").ok()
+}
+
+/// Extract a datetime from a list of markers, using an inherited datetime as fallback.
+///
+/// The function processes markers in reverse order, allowing later markers to override
+/// earlier ones. It combines date-only and time-only markers when both are present.
+///
+/// Rules:
+/// - If a full datetime marker (14 digits) is found, it sets both date and time
+/// - If only a date marker is found, the time defaults to midnight
+/// - If only a time marker is found, the date is inherited
+/// - If no valid markers are found, the inherited datetime is returned
+pub fn extract_datetime_from_marker_list(
+    markers: &[String],
+    inherited_datetime: DateTime<Utc>,
+) -> DateTime<Utc> {
+    let mut shard_time: Option<NaiveTime> = None;
+    let mut shard_date: Option<NaiveDate> = None;
+
+    // Process markers in reverse order (last wins)
+    for marker in markers.iter().rev() {
+        if let Some(time) = extract_time_from_marker(marker) {
+            shard_time = Some(time);
+        }
+        if let Some(date) = extract_date_from_marker(marker) {
+            shard_date = Some(date);
+        }
+        if let Some(datetime) = extract_datetime_from_marker(marker) {
+            shard_date = Some(datetime.naive_utc().date());
+            shard_time = Some(datetime.naive_utc().time());
+        }
+    }
+
+    // Combine date and time, applying defaults as needed
+    let final_date = shard_date.unwrap_or_else(|| inherited_datetime.naive_utc().date());
+    let final_time = match (shard_date, shard_time) {
+        // If we have a date but no time, use midnight
+        (Some(_), None) => NaiveTime::from_hms_opt(0, 0, 0).unwrap(),
+        // Otherwise use the shard time or inherit
+        _ => shard_time.unwrap_or_else(|| inherited_datetime.naive_utc().time()),
+    };
+
+    NaiveDateTime::new(final_date, final_time).and_utc()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::TimeZone;
+
+    #[test]
+    fn test_extract_date_from_file_name_valid() {
+        let file_name = "20230101-123456 Some Text.md";
+        assert_eq!(
+            extract_datetime_from_file_name(file_name),
+            Some(Utc.with_ymd_and_hms(2023, 1, 1, 12, 34, 56).unwrap())
+        );
+    }
+
+    #[test]
+    fn test_extract_date_from_file_name_invalid() {
+        let file_name = "invalid-file-name.md";
+        assert_eq!(extract_datetime_from_file_name(file_name), None);
+    }
+
+    #[test]
+    fn test_extract_date_from_file_name_without_time() {
+        let file_name = "20230101 Some Text.md";
+        assert_eq!(
+            extract_datetime_from_file_name(file_name),
+            Some(Utc.with_ymd_and_hms(2023, 1, 1, 0, 0, 0).unwrap())
+        );
+    }
+
+    #[test]
+    fn test_extract_date_from_file_name_short_time() {
+        let file_name = "20230101-1234 Some Text.md";
+        assert_eq!(
+            extract_datetime_from_file_name(file_name),
+            Some(Utc.with_ymd_and_hms(2023, 1, 1, 12, 34, 0).unwrap())
+        );
+    }
+
+    #[test]
+    fn test_extract_date_from_file_name_empty_string() {
+        let file_name = "";
+        assert_eq!(extract_datetime_from_file_name(file_name), None);
+    }
+
+    #[test]
+    fn test_extract_date_from_file_name_with_full_path() {
+        let file_name = "/path/to/20230101-123456 Some Text.md";
+        assert_eq!(
+            extract_datetime_from_file_name(file_name),
+            Some(Utc.with_ymd_and_hms(2023, 1, 1, 12, 34, 56).unwrap())
+        );
+    }
+
+    #[test]
+    fn test_extract_datetime_from_marker_valid() {
+        let marker = "20250101150000";
+        assert_eq!(
+            extract_datetime_from_marker(marker),
+            Some(Utc.with_ymd_and_hms(2025, 1, 1, 15, 0, 0).unwrap())
+        );
+    }
+
+    #[test]
+    fn test_extract_datetime_from_marker_invalid_format() {
+        assert_eq!(extract_datetime_from_marker("2025010115000"), None); // too short
+        assert_eq!(extract_datetime_from_marker("202501011500000"), None); // too long
+        assert_eq!(extract_datetime_from_marker("2025-01-01T150000"), None); // separators
+        assert_eq!(extract_datetime_from_marker("2025010115000a"), None); // non-digit
+        assert_eq!(extract_datetime_from_marker(""), None);
+    }
+
+    #[test]
+    fn test_extract_datetime_from_marker_invalid_values() {
+        assert_eq!(extract_datetime_from_marker("20250230120000"), None); // Feb 30
+        assert_eq!(extract_datetime_from_marker("20250101126000"), None); // minute 60
+        assert_eq!(extract_datetime_from_marker("20250101240000"), None); // hour 24
+    }
+
+    #[test]
+    fn test_extract_date_from_marker_valid() {
+        let marker = "20250101";
+        assert_eq!(
+            extract_date_from_marker(marker),
+            Some(NaiveDate::from_ymd_opt(2025, 1, 1).unwrap())
+        );
+    }
+
+    #[test]
+    fn test_extract_date_from_marker_invalid_format() {
+        assert_eq!(extract_date_from_marker("2025010"), None); // too short
+        assert_eq!(extract_date_from_marker("202501011"), None); // too long
+        assert_eq!(extract_date_from_marker("2025-01-01"), None); // separators
+        assert_eq!(extract_date_from_marker("2025010a"), None); // non-digit
+        assert_eq!(extract_date_from_marker(""), None);
+    }
+
+    #[test]
+    fn test_extract_date_from_marker_invalid_values() {
+        assert_eq!(extract_date_from_marker("20250230"), None); // Feb 30
+        assert_eq!(extract_date_from_marker("20251301"), None); // month 13
+        assert_eq!(extract_date_from_marker("20250132"), None); // day 32
+    }
+
+    #[test]
+    fn test_extract_time_from_marker_valid() {
+        let marker = "150000";
+        assert_eq!(
+            extract_time_from_marker(marker),
+            Some(NaiveTime::from_hms_opt(15, 0, 0).unwrap())
+        );
+    }
+
+    #[test]
+    fn test_extract_time_from_marker_invalid_format() {
+        assert_eq!(extract_time_from_marker("15000"), None); // too short
+        assert_eq!(extract_time_from_marker("1500000"), None); // too long
+        assert_eq!(extract_time_from_marker("15:00:00"), None); // separators
+        assert_eq!(extract_time_from_marker("15000a"), None); // non-digit
+        assert_eq!(extract_time_from_marker(""), None);
+    }
+
+    #[test]
+    fn test_extract_time_from_marker_invalid_values() {
+        assert_eq!(extract_time_from_marker("240000"), None); // hour 24
+        assert_eq!(extract_time_from_marker("156000"), None); // minute 60
+                                                              // Note: chrono allows leap seconds (60), so 150060 is valid
+    }
+
+    #[test]
+    fn test_no_markers_inherits_datetime() {
+        let inherited = Utc.with_ymd_and_hms(2025, 1, 2, 3, 4, 5).unwrap();
+        assert_eq!(extract_datetime_from_marker_list(&[], inherited), inherited);
+    }
+
+    #[test]
+    fn test_unrelated_markers_inherits_datetime() {
+        let inherited = Utc.with_ymd_and_hms(2025, 1, 2, 3, 4, 5).unwrap();
+        let markers: Vec<String> = vec![
+            "not-a-marker".to_string(),
+            "2025-01-01".to_string(),
+            "1500".to_string(),
+            "1234567".to_string(),
+        ];
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            inherited
+        );
+    }
+
+    #[test]
+    fn test_date_only_marker_sets_midnight() {
+        let inherited = Utc.with_ymd_and_hms(2025, 6, 7, 8, 9, 10).unwrap();
+        let markers = vec!["20250101".to_string()];
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            Utc.with_ymd_and_hms(2025, 1, 1, 0, 0, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_time_only_marker_inherits_date() {
+        let inherited = Utc.with_ymd_and_hms(2025, 6, 7, 8, 9, 10).unwrap();
+        let markers = vec!["150000".to_string()];
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            Utc.with_ymd_and_hms(2025, 6, 7, 15, 0, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_datetime_marker_overrides_both_date_and_time() {
+        let inherited = Utc.with_ymd_and_hms(2025, 6, 7, 8, 9, 10).unwrap();
+        let markers = vec!["20250101150000".to_string()];
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            Utc.with_ymd_and_hms(2025, 1, 1, 15, 0, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_combined_date_and_time_markers() {
+        let inherited = Utc.with_ymd_and_hms(2025, 6, 7, 8, 9, 10).unwrap();
+        let markers = vec!["20250101".to_string(), "150000".to_string()];
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            Utc.with_ymd_and_hms(2025, 1, 1, 15, 0, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_first_marker_wins_when_multiple_dates_or_times() {
+        let inherited = Utc.with_ymd_and_hms(2025, 6, 7, 8, 9, 10).unwrap();
+        let markers = vec![
+            "20250101".to_string(),
+            "150000".to_string(),
+            "20250102".to_string(),
+            "160000".to_string(),
+        ];
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            Utc.with_ymd_and_hms(2025, 1, 1, 15, 0, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_last_separated_date_and_time_win() {
+        let inherited = Utc.with_ymd_and_hms(2025, 6, 7, 8, 9, 10).unwrap();
+        let markers = vec![
+            "20250101".to_string(),
+            "150000".to_string(),
+            "20250102160000".to_string(),
+        ];
+        // The first date (20250101) and first time (150000) should win over the later combined datetime
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            Utc.with_ymd_and_hms(2025, 1, 1, 15, 0, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_invalid_date_or_time_markers_are_ignored() {
+        let inherited = Utc.with_ymd_and_hms(2025, 6, 7, 8, 9, 10).unwrap();
+        let markers = vec![
+            "20251301".to_string(), // invalid month
+            "240000".to_string(),   // invalid hour
+            "20250101".to_string(), // valid
+            "150000".to_string(),   // valid
+        ];
+        assert_eq!(
+            extract_datetime_from_marker_list(&markers, inherited),
+            Utc.with_ymd_and_hms(2025, 1, 1, 15, 0, 0).unwrap()
+        );
+    }
+}
diff --git a/src/localize/mod.rs b/src/localize/mod.rs
new file mode 100644
index 0000000..c8f0441
--- /dev/null
+++ b/src/localize/mod.rs
@@ -0,0 +1,15 @@
+mod configuration;
+mod datetime;
+mod preconfigured;
+mod shard;
+
+pub use configuration::{
+    merge_dimensions, merge_markers, merge_repository_configuration, merge_single_dimension,
+    merge_single_marker,
+};
+pub use datetime::{
+    extract_date_from_marker, extract_datetime_from_file_name, extract_datetime_from_marker,
+    extract_datetime_from_marker_list, extract_time_from_marker,
+};
+pub use preconfigured::TaskConfiguration;
+pub use shard::{localize_shard, localize_stream_file};
diff --git a/src/localize/preconfigured.rs b/src/localize/preconfigured.rs
new file mode 100644
index 0000000..99b60cf
--- /dev/null
+++ b/src/localize/preconfigured.rs
@@ -0,0 +1,46 @@
+use once_cell::sync::Lazy;
+
+use crate::models::{Dimension, Marker, MarkerPlacement, RepositoryConfiguration};
+
+/// Pre-configured repository configuration for task management.
+#[allow(non_upper_case_globals)]
+pub static TaskConfiguration: Lazy<RepositoryConfiguration> = Lazy::new(|| {
+    RepositoryConfiguration::new()
+        .with_dimension(
+            "task",
+            Dimension::new("Task")
+                .with_comment(
+                    "If placed, the given shard is a task. The placement determines the state.",
+                )
+                .with_propagate(false),
+        )
+        .with_dimension(
+            "project",
+            Dimension::new("Project")
+                .with_comment("Project the task is attached to")
+                .with_propagate(true),
+        )
+        .with_marker(
+            "Task",
+            Marker::new("Task").with_placements(vec![
+                MarkerPlacement::new("task").with_value("open"),
+                MarkerPlacement::new("task")
+                    .with_if_with(vec!["Done"])
+                    .with_value("done"),
+                MarkerPlacement::new("task")
+                    .with_if_with(vec!["Waiting"])
+                    .with_value("waiting"),
+                MarkerPlacement::new("task")
+                    .with_if_with(vec!["Cancelled"])
+                    .with_value("cancelled"),
+                MarkerPlacement::new("task")
+                    .with_if_with(vec!["NotDone"])
+                    .with_value("cancelled"),
+            ]),
+        )
+        .with_marker(
+            "WaitingFor",
+            Marker::new("Task")
+                .with_placements(vec![MarkerPlacement::new("task").with_value("waiting")]),
+        )
+});
diff --git a/src/localize/shard.rs b/src/localize/shard.rs
new file mode 100644
index 0000000..279b8c6
--- /dev/null
+++ b/src/localize/shard.rs
@@ -0,0 +1,282 @@
+use chrono::{DateTime, Utc};
+use indexmap::{IndexMap, IndexSet};
+
+use crate::error::StreamdError;
+use crate::models::{LocalizedShard, RepositoryConfiguration, Shard, StreamFile};
+
+use super::datetime::{extract_datetime_from_file_name, extract_datetime_from_marker_list};
+
+/// Localize a shard within the repository's coordinate system.
+///
+/// This function:
+/// 1. Extracts datetime from markers
+/// 2. Applies marker placements to determine dimensional position
+/// 3. Propagates dimensional values to children based on dimension configuration
+pub fn localize_shard(
+    shard: &Shard,
+    config: &RepositoryConfiguration,
+    propagated: &IndexMap<String, String>,
+    moment: DateTime<Utc>,
+) -> LocalizedShard {
+    let mut position = propagated.clone();
+    let mut private_position: IndexMap<String, String> = IndexMap::new();
+
+    // Extract datetime from markers
+    let adjusted_moment = extract_datetime_from_marker_list(&shard.markers, moment);
+
+    // Convert markers to a set for if_with checking
+    let marker_set: IndexSet<String> = shard.markers.iter().cloned().collect();
+
+    // Process each marker and its placements
+    for marker in &shard.markers {
+        if let Some(marker_def) = config.markers.get(marker) {
+            for placement in &marker_def.placements {
+                // Check if_with condition
+                if !placement.if_with.is_subset(&marker_set) {
+                    continue;
+                }
+
+                // Get the dimension configuration
+                let dimension = match config.dimensions.get(&placement.dimension) {
+                    Some(d) => d,
+                    None => continue,
+                };
+
+                let value = placement.value.clone().unwrap_or_else(|| marker.clone());
+
+                // Check if we should place the value
+                let should_place = placement.overwrites
+                    || (!position.contains_key(&placement.dimension)
+                        && !private_position.contains_key(&placement.dimension));
+
+                if should_place {
+                    if dimension.propagate {
+                        position.insert(placement.dimension.clone(), value);
+                    } else {
+                        private_position.insert(placement.dimension.clone(), value);
+                    }
+                }
+            }
+        }
+    }
+
+    // Recursively localize children with propagated position
+    let children: Vec<LocalizedShard> = shard
+        .children
+        .iter()
+        .map(|child| localize_shard(child, config, &position, adjusted_moment))
+        .collect();
+
+    // Merge private position into final position
+    position.extend(private_position);
+
+    LocalizedShard {
+        markers: shard.markers.clone(),
+        tags: shard.tags.clone(),
+        start_line: shard.start_line,
+        end_line: shard.end_line,
+        moment: adjusted_moment,
+        location: position,
+        children,
+    }
+}
+
+/// Localize an entire stream file.
+///
+/// Extracts the datetime from the file name and localizes the root shard.
+pub fn localize_stream_file(
+    stream_file: &StreamFile,
+    config: &RepositoryConfiguration,
+) -> Result<LocalizedShard, StreamdError> {
+    let shard_date = extract_datetime_from_file_name(&stream_file.file_name)
+        .ok_or_else(|| StreamdError::DateExtractionError(stream_file.file_name.clone()))?;
+
+    let shard = stream_file
+        .shard
+        .as_ref()
+        .ok_or_else(|| StreamdError::DateExtractionError("No shard in file".to_string()))?;
+
+    let mut initial_location = IndexMap::new();
+    initial_location.insert("file".to_string(), stream_file.file_name.clone());
+
+    Ok(localize_shard(shard, config, &initial_location, shard_date))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::models::{Dimension, Marker, MarkerPlacement};
+    use chrono::TimeZone;
+
+    fn make_config() -> RepositoryConfiguration {
+        RepositoryConfiguration::new()
+            .with_dimension(
+                "project",
+                Dimension::new("Project")
+                    .with_comment("GTD Project that is being worked on")
+                    .with_propagate(true),
+            )
+            .with_dimension(
+                "moment",
+                Dimension::new("Moment")
+                    .with_comment("Timestamp this entry was created at")
+                    .with_propagate(true),
+            )
+            .with_dimension(
+                "timesheet",
+                Dimension::new("Timesheet")
+                    .with_comment("Time Cards for Time Tracking")
+                    .with_propagate(true),
+            )
+            .with_marker(
+                "Streamd",
+                Marker::new("Streamd").with_placements(vec![
+                    MarkerPlacement::new("project"),
+                    MarkerPlacement::new("timesheet")
+                        .with_if_with(vec!["Timesheet"])
+                        .with_value("coding"),
+                ]),
+            )
+            .with_marker(
+                "JobHunting",
+                Marker::new("JobHunting").with_placements(vec![MarkerPlacement::new("project")]),
+            )
+    }
+
+    #[test]
+    fn test_project_simple_stream_file() {
+        let config = make_config();
+        let stream_file = StreamFile::new("20250622-121000 Test File.md")
+            .with_shard(Shard::new(1, 1).with_markers(vec!["Streamd".to_string()]));
+
+        let result = localize_stream_file(&stream_file, &config).unwrap();
+
+        assert_eq!(
+            result.moment,
+            Utc.with_ymd_and_hms(2025, 6, 22, 12, 10, 0).unwrap()
+        );
+        assert_eq!(result.markers, vec!["Streamd"]);
+        assert_eq!(result.location.get("project"), Some(&"Streamd".to_string()));
+        assert_eq!(
+            result.location.get("file"),
+            Some(&stream_file.file_name.clone())
+        );
+    }
+
+    #[test]
+    fn test_timesheet_use_case() {
+        let config = make_config();
+        let stream_file = StreamFile::new("20260131-210000 Test File.md").with_shard(
+            Shard::new(1, 1).with_markers(vec!["Timesheet".to_string(), "Streamd".to_string()]),
+        );
+
+        let result = localize_stream_file(&stream_file, &config).unwrap();
+
+        assert_eq!(
+            result.moment,
+            Utc.with_ymd_and_hms(2026, 1, 31, 21, 0, 0).unwrap()
+        );
+        assert_eq!(result.location.get("project"), Some(&"Streamd".to_string()));
+        assert_eq!(
+            result.location.get("timesheet"),
+            Some(&"coding".to_string())
+        );
+    }
+
+    #[test]
+    fn test_overwrites_true_propagated_dimension_overwrites_existing_value() {
+        let config = RepositoryConfiguration::new()
+            .with_dimension("project", Dimension::new("Project").with_propagate(true))
+            .with_marker(
+                "A",
+                Marker::new("A")
+                    .with_placements(vec![MarkerPlacement::new("project").with_value("a")]),
+            )
+            .with_marker(
+                "B",
+                Marker::new("B").with_placements(vec![MarkerPlacement::new("project")
+                    .with_value("b")
+                    .with_overwrites(true)]),
+            );
+
+        let stream_file = StreamFile::new("20260131-210000 Test File.md")
+            .with_shard(Shard::new(1, 1).with_markers(vec!["A".to_string(), "B".to_string()]));
+
+        let result = localize_stream_file(&stream_file, &config).unwrap();
+
+        assert_eq!(result.location.get("project"), Some(&"b".to_string()));
+    }
+
+    #[test]
+    fn test_overwrites_false_propagated_dimension_does_not_overwrite_existing_value() {
+        let config = RepositoryConfiguration::new()
+            .with_dimension("project", Dimension::new("Project").with_propagate(true))
+            .with_marker(
+                "A",
+                Marker::new("A")
+                    .with_placements(vec![MarkerPlacement::new("project").with_value("a")]),
+            )
+            .with_marker(
+                "B",
+                Marker::new("B").with_placements(vec![MarkerPlacement::new("project")
+                    .with_value("b")
+                    .with_overwrites(false)]),
+            );
+
+        let stream_file = StreamFile::new("20260131-210000 Test File.md")
+            .with_shard(Shard::new(1, 1).with_markers(vec!["A".to_string(), "B".to_string()]));
+
+        let result = localize_stream_file(&stream_file, &config).unwrap();
+
+        assert_eq!(result.location.get("project"), Some(&"a".to_string()));
+    }
+
+    #[test]
+    fn test_overwrites_true_non_propagated_dimension_overwrites_private_value() {
+        let config = RepositoryConfiguration::new()
+            .with_dimension("label", Dimension::new("Label").with_propagate(false))
+            .with_marker(
+                "A",
+                Marker::new("A")
+                    .with_placements(vec![MarkerPlacement::new("label").with_value("a")]),
+            )
+            .with_marker(
+                "B",
+                Marker::new("B").with_placements(vec![MarkerPlacement::new("label")
+                    .with_value("b")
+                    .with_overwrites(true)]),
+            );
+
+        let stream_file = StreamFile::new("20260131-210000 Test File.md")
+            .with_shard(Shard::new(1, 1).with_markers(vec!["A".to_string(), "B".to_string()]));
+
+        let result = localize_stream_file(&stream_file, &config).unwrap();
+
+        assert_eq!(result.location.get("label"), Some(&"b".to_string()));
+    }
+
+    #[test]
+    fn test_overwrites_false_non_propagated_dimension_does_not_overwrite_private_value() {
+        let config = RepositoryConfiguration::new()
+            .with_dimension("label", Dimension::new("Label").with_propagate(false))
+            .with_marker(
+                "A",
+                Marker::new("A").with_placements(vec![MarkerPlacement::new("label")
+                    .with_value("a")
+                    .with_overwrites(true)]),
+            )
+            .with_marker(
+                "B",
+                Marker::new("B").with_placements(vec![MarkerPlacement::new("label")
+                    .with_value("b")
+                    .with_overwrites(false)]),
+            );
+
+        let stream_file = StreamFile::new("20260131-210000 Test File.md")
+            .with_shard(Shard::new(1, 1).with_markers(vec!["A".to_string(), "B".to_string()]));
+
+        let result = localize_stream_file(&stream_file, &config).unwrap();
+
+        assert_eq!(result.location.get("label"), Some(&"a".to_string()));
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d4bfd9e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,19 @@
+use clap::Parser;
+use streamd::cli::{Cli, Commands};
+
+fn main() -> miette::Result<()> {
+    let cli = Cli::parse();
+
+    match cli.command {
+        Some(Commands::New) => streamd::cli::commands::new::run()?,
+        Some(Commands::Todo) => streamd::cli::commands::todo::run()?,
+        Some(Commands::Edit { number }) => streamd::cli::commands::edit::run(number)?,
+        Some(Commands::Timesheet) => streamd::cli::commands::timesheet::run()?,
+        Some(Commands::Completions { shell }) => {
+            streamd::cli::commands::completions::run(shell);
+        }
+        None => streamd::cli::commands::new::run()?,
+    }
+
+    Ok(())
+}
diff --git a/src/models/dimension.rs b/src/models/dimension.rs
new file mode 100644
index 0000000..0d32f6b
--- /dev/null
+++ b/src/models/dimension.rs
@@ -0,0 +1,42 @@
+use serde::{Deserialize, Serialize};
+
+/// A Dimension represents an axis along which shards can be categorized.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Dimension {
+    /// Human-readable name for display purposes.
+    pub display_name: String,
+
+    /// Optional description of what this dimension represents.
+    #[serde(default)]
+    pub comment: Option<String>,
+
+    /// Whether values in this dimension should propagate to child shards.
+    #[serde(default)]
+    pub propagate: bool,
+
+    /// Tracks whether 'propagate' was explicitly set (for merge semantics).
+    #[serde(skip)]
+    pub propagate_was_set: bool,
+}
+
+impl Dimension {
+    pub fn new(display_name: impl Into<String>) -> Self {
+        Self {
+            display_name: display_name.into(),
+            comment: None,
+            propagate: false,
+            propagate_was_set: false,
+        }
+    }
+
+    pub fn with_comment(mut self, comment: impl Into<String>) -> Self {
+        self.comment = Some(comment.into());
+        self
+    }
+
+    pub fn with_propagate(mut self, propagate: bool) -> Self {
+        self.propagate = propagate;
+        self.propagate_was_set = true;
+        self
+    }
+}
diff --git a/src/models/localized_shard.rs b/src/models/localized_shard.rs
new file mode 100644
index 0000000..4e6173b
--- /dev/null
+++ b/src/models/localized_shard.rs
@@ -0,0 +1,63 @@
+use chrono::{DateTime, Utc};
+use indexmap::IndexMap;
+use serde::{Deserialize, Serialize};
+
+/// A LocalizedShard extends a Shard with temporal and dimensional context.
+/// It represents a shard that has been placed within the repository's coordinate system.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LocalizedShard {
+    /// Markers are tags that appear at the beginning of a line before any content.
+    pub markers: Vec<String>,
+
+    /// Tags are @-prefixed identifiers that appear after content has started.
+    pub tags: Vec<String>,
+
+    /// The starting line number in the source file (1-indexed).
+    pub start_line: usize,
+
+    /// The ending line number in the source file (1-indexed).
+    pub end_line: usize,
+
+    /// The moment in time this shard is associated with.
+    pub moment: DateTime<Utc>,
+
+    /// The dimensional location of this shard (dimension name -> value).
+    pub location: IndexMap<String, String>,
+
+    /// Child shards nested within this shard.
+    pub children: Vec<LocalizedShard>,
+}
+
+impl LocalizedShard {
+    pub fn new(start_line: usize, end_line: usize, moment: DateTime<Utc>) -> Self {
+        Self {
+            markers: Vec::new(),
+            tags: Vec::new(),
+            start_line,
+            end_line,
+            moment,
+            location: IndexMap::new(),
+            children: Vec::new(),
+        }
+    }
+
+    pub fn with_markers(mut self, markers: Vec<String>) -> Self {
+        self.markers = markers;
+        self
+    }
+
+    pub fn with_tags(mut self, tags: Vec<String>) -> Self {
+        self.tags = tags;
+        self
+    }
+
+    pub fn with_location(mut self, location: IndexMap<String, String>) -> Self {
+        self.location = location;
+        self
+    }
+
+    pub fn with_children(mut self, children: Vec<LocalizedShard>) -> Self {
+        self.children = children;
+        self
+    }
+}
diff --git a/src/models/marker.rs b/src/models/marker.rs
new file mode 100644
index 0000000..8b1cdb1
--- /dev/null
+++ b/src/models/marker.rs
@@ -0,0 +1,76 @@
+use indexmap::IndexSet;
+use serde::{Deserialize, Serialize};
+
+/// A MarkerPlacement defines how a marker affects dimension values.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct MarkerPlacement {
+    /// Only apply this placement if all markers in `if_with` are also present.
+    #[serde(default)]
+    pub if_with: IndexSet<String>,
+
+    /// The dimension to place a value in.
+    pub dimension: String,
+
+    /// The value to place. If None, uses the marker name itself.
+    #[serde(default)]
+    pub value: Option<String>,
+
+    /// Whether this placement should overwrite existing values in the dimension.
+    #[serde(default = "default_overwrites")]
+    pub overwrites: bool,
+}
+
+fn default_overwrites() -> bool {
+    true
+}
+
+impl MarkerPlacement {
+    pub fn new(dimension: impl Into<String>) -> Self {
+        Self {
+            if_with: IndexSet::new(),
+            dimension: dimension.into(),
+            value: None,
+            overwrites: true,
+        }
+    }
+
+    pub fn with_if_with(mut self, if_with: impl IntoIterator<Item = impl Into<String>>) -> Self {
+        self.if_with = if_with.into_iter().map(Into::into).collect();
+        self
+    }
+
+    pub fn with_value(mut self, value: impl Into<String>) -> Self {
+        self.value = Some(value.into());
+        self
+    }
+
+    pub fn with_overwrites(mut self, overwrites: bool) -> Self {
+        self.overwrites = overwrites;
+        self
+    }
+}
+
+/// A Marker defines how an @-tag should be interpreted for dimensional placement.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Marker {
+    /// Human-readable name for display purposes.
+    pub display_name: String,
+
+    /// The dimensional placements this marker creates.
+    #[serde(default)]
+    pub placements: Vec<MarkerPlacement>,
+}
+
+impl Marker {
+    pub fn new(display_name: impl Into<String>) -> Self {
+        Self {
+            display_name: display_name.into(),
+            placements: Vec::new(),
+        }
+    }
+
+    pub fn with_placements(mut self, placements: Vec<MarkerPlacement>) -> Self {
+        self.placements = placements;
+        self
+    }
+}
diff --git a/src/models/mod.rs b/src/models/mod.rs
new file mode 100644
index 0000000..495d980
--- /dev/null
+++ b/src/models/mod.rs
@@ -0,0 +1,11 @@
+mod dimension;
+mod localized_shard;
+mod marker;
+mod shard;
+mod timecard;
+
+pub use dimension::Dimension;
+pub use localized_shard::LocalizedShard;
+pub use marker::{Marker, MarkerPlacement};
+pub use shard::{RepositoryConfiguration, Shard, StreamFile};
+pub use timecard::{SpecialDayType, Timecard, Timesheet};
diff --git a/src/models/shard.rs b/src/models/shard.rs
new file mode 100644
index 0000000..bf6dd7a
--- /dev/null
+++ b/src/models/shard.rs
@@ -0,0 +1,115 @@
+use indexmap::IndexMap;
+use serde::{Deserialize, Serialize};
+
+use super::{Dimension, Marker};
+
+/// A Shard represents a section of a markdown file that may contain markers and tags.
+/// Shards form a tree structure where children inherit context from their parents.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Shard {
+    /// Markers are tags that appear at the beginning of a line before any content.
+    /// They define dimensional placement for the shard.
+    #[serde(default)]
+    pub markers: Vec<String>,
+
+    /// Tags are @-prefixed identifiers that appear after content has started.
+    /// They are informational but don't affect dimensional placement.
+    #[serde(default)]
+    pub tags: Vec<String>,
+
+    /// The starting line number in the source file (1-indexed).
+    pub start_line: usize,
+
+    /// The ending line number in the source file (1-indexed).
+    pub end_line: usize,
+
+    /// Child shards nested within this shard.
+    #[serde(default)]
+    pub children: Vec<Shard>,
+}
+
+impl Shard {
+    pub fn new(start_line: usize, end_line: usize) -> Self {
+        Self {
+            markers: Vec::new(),
+            tags: Vec::new(),
+            start_line,
+            end_line,
+            children: Vec::new(),
+        }
+    }
+
+    pub fn with_markers(mut self, markers: Vec<String>) -> Self {
+        self.markers = markers;
+        self
+    }
+
+    pub fn with_tags(mut self, tags: Vec<String>) -> Self {
+        self.tags = tags;
+        self
+    }
+
+    pub fn with_children(mut self, children: Vec<Shard>) -> Self {
+        self.children = children;
+        self
+    }
+}
+
+/// A StreamFile represents a parsed markdown file with its associated shard tree.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct StreamFile {
+    /// The file name or path of the source file.
+    pub file_name: String,
+
+    /// The root shard representing the entire file's content structure.
+    pub shard: Option<Shard>,
+}
+
+impl StreamFile {
+    pub fn new(file_name: impl Into<String>) -> Self {
+        Self {
+            file_name: file_name.into(),
+            shard: None,
+        }
+    }
+
+    pub fn with_shard(mut self, shard: Shard) -> Self {
+        self.shard = Some(shard);
+        self
+    }
+}
+
+/// Repository configuration defines the dimensions and markers used to organize shards.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RepositoryConfiguration {
+    /// Dimensions define the axes along which shards can be positioned.
+    pub dimensions: IndexMap<String, Dimension>,
+
+    /// Markers define how @-tags map to dimension placements.
+    pub markers: IndexMap<String, Marker>,
+}
+
+impl RepositoryConfiguration {
+    pub fn new() -> Self {
+        Self {
+            dimensions: IndexMap::new(),
+            markers: IndexMap::new(),
+        }
+    }
+
+    pub fn with_dimension(mut self, name: impl Into<String>, dimension: Dimension) -> Self {
+        self.dimensions.insert(name.into(), dimension);
+        self
+    }
+
+    pub fn with_marker(mut self, name: impl Into<String>, marker: Marker) -> Self {
+        self.markers.insert(name.into(), marker);
+        self
+    }
+}
+
+impl Default for RepositoryConfiguration {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/src/models/timecard.rs b/src/models/timecard.rs
new file mode 100644
index 0000000..a87dd19
--- /dev/null
+++ b/src/models/timecard.rs
@@ -0,0 +1,77 @@
+use chrono::NaiveDate;
+use chrono::NaiveTime;
+use serde::{Deserialize, Serialize};
+
+/// Type of special day that affects timesheet calculations.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum SpecialDayType {
+    #[serde(rename = "VACATION")]
+    Vacation,
+    #[serde(rename = "UNDERTIME")]
+    Undertime,
+    #[serde(rename = "HOLIDAY")]
+    Holiday,
+    #[serde(rename = "WEEKEND")]
+    Weekend,
+}
+
+impl std::fmt::Display for SpecialDayType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            SpecialDayType::Vacation => write!(f, "VACATION"),
+            SpecialDayType::Undertime => write!(f, "UNDERTIME"),
+            SpecialDayType::Holiday => write!(f, "HOLIDAY"),
+            SpecialDayType::Weekend => write!(f, "WEEKEND"),
+        }
+    }
+}
+
+/// A Timecard represents a single work period with start and end times.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Timecard {
+    pub from_time: NaiveTime,
+    pub to_time: NaiveTime,
+}
+
+impl Timecard {
+    pub fn new(from_time: NaiveTime, to_time: NaiveTime) -> Self {
+        Self { from_time, to_time }
+    }
+}
+
+/// A Timesheet aggregates all time tracking information for a single day.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Timesheet {
+    pub date: NaiveDate,
+    #[serde(default)]
+    pub is_sick_leave: bool,
+    #[serde(default)]
+    pub special_day_type: Option<SpecialDayType>,
+    pub timecards: Vec<Timecard>,
+}
+
+impl Timesheet {
+    pub fn new(date: NaiveDate) -> Self {
+        Self {
+            date,
+            is_sick_leave: false,
+            special_day_type: None,
+            timecards: Vec::new(),
+        }
+    }
+
+    pub fn with_sick_leave(mut self, is_sick_leave: bool) -> Self {
+        self.is_sick_leave = is_sick_leave;
+        self
+    }
+
+    pub fn with_special_day_type(mut self, special_day_type: SpecialDayType) -> Self {
+        self.special_day_type = Some(special_day_type);
+        self
+    }
+
+    pub fn with_timecards(mut self, timecards: Vec<Timecard>) -> Self {
+        self.timecards = timecards;
+        self
+    }
+}
diff --git a/src/query/find.rs b/src/query/find.rs
new file mode 100644
index 0000000..c06e117
--- /dev/null
+++ b/src/query/find.rs
@@ -0,0 +1,209 @@
+use crate::models::LocalizedShard;
+
+/// Find all shards matching a predicate, recursively searching through children.
+///
+/// The search is depth-first, with the parent tested before its children.
+pub fn find_shard<F>(shards: &[LocalizedShard], predicate: F) -> Vec<LocalizedShard>
+where
+    F: Fn(&LocalizedShard) -> bool + Copy,
+{
+    let mut found_shards = Vec::new();
+
+    for shard in shards {
+        if predicate(shard) {
+            found_shards.push(shard.clone());
+        }
+        found_shards.extend(find_shard(&shard.children, predicate));
+    }
+
+    found_shards
+}
+
+/// Find all shards where a specific dimension has a specific value.
+pub fn find_shard_by_position(
+    shards: &[LocalizedShard],
+    dimension: &str,
+    value: &str,
+) -> Vec<LocalizedShard> {
+    find_shard(shards, |shard| {
+        shard
+            .location
+            .get(dimension)
+            .map(|v| v == value)
+            .unwrap_or(false)
+    })
+}
+
+/// Find all shards where a specific dimension is set (regardless of value).
+pub fn find_shard_by_set_dimension(
+    shards: &[LocalizedShard],
+    dimension: &str,
+) -> Vec<LocalizedShard> {
+    find_shard(shards, |shard| shard.location.contains_key(dimension))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::{TimeZone, Utc};
+    use indexmap::IndexMap;
+
+    fn generate_localized_shard(
+        location: Option<IndexMap<String, String>>,
+        children: Option<Vec<LocalizedShard>>,
+    ) -> LocalizedShard {
+        LocalizedShard {
+            start_line: 1,
+            end_line: 1,
+            moment: Utc.with_ymd_and_hms(2020, 1, 1, 0, 0, 0).unwrap(),
+            location: location.unwrap_or_default(),
+            children: children.unwrap_or_default(),
+            markers: vec![],
+            tags: vec![],
+        }
+    }
+
+    #[test]
+    fn test_returns_empty_when_no_match() {
+        let mut loc = IndexMap::new();
+        loc.insert("file".to_string(), "a.md".to_string());
+        let root = generate_localized_shard(Some(loc), None);
+        let shards = vec![root];
+
+        let result = find_shard(&shards, |s| s.location.contains_key("missing"));
+
+        assert!(result.is_empty());
+    }
+
+    #[test]
+    fn test_finds_matches_depth_first_and_preserves_order() {
+        let mut loc1 = IndexMap::new();
+        loc1.insert("k".to_string(), "match".to_string());
+        let grandchild = generate_localized_shard(Some(loc1.clone()), None);
+
+        let child1 = generate_localized_shard(Some(loc1), Some(vec![grandchild.clone()]));
+
+        let mut loc2 = IndexMap::new();
+        loc2.insert("k".to_string(), "nope".to_string());
+        let child2 = generate_localized_shard(Some(loc2.clone()), None);
+
+        let root = generate_localized_shard(Some(loc2), Some(vec![child1.clone(), child2]));
+
+        let result = find_shard(&[root], |s| {
+            s.location.get("k") == Some(&"match".to_string())
+        });
+
+        assert_eq!(result.len(), 2);
+        assert_eq!(result[0], child1);
+        assert_eq!(result[1], grandchild);
+    }
+
+    #[test]
+    fn test_includes_root_if_it_matches() {
+        let mut loc = IndexMap::new();
+        loc.insert("k".to_string(), "match".to_string());
+
+        let child = generate_localized_shard(Some(loc.clone()), None);
+        let root = generate_localized_shard(Some(loc), Some(vec![child]));
+
+        let result = find_shard(std::slice::from_ref(&root), |s| {
+            s.location.get("k") == Some(&"match".to_string())
+        });
+
+        assert_eq!(result[0], root);
+        assert_eq!(result.len(), 2);
+    }
+
+    #[test]
+    fn test_multiple_roots_keeps_left_to_right_order() {
+        let mut loc_match = IndexMap::new();
+        loc_match.insert("k".to_string(), "match".to_string());
+
+        let mut loc_nope = IndexMap::new();
+        loc_nope.insert("k".to_string(), "nope".to_string());
+
+        let a = generate_localized_shard(Some(loc_match.clone()), None);
+        let b = generate_localized_shard(Some(loc_match), None);
+        let c = generate_localized_shard(Some(loc_nope), None);
+
+        let result = find_shard(&[a.clone(), b.clone(), c], |s| {
+            s.location.get("k") == Some(&"match".to_string())
+        });
+
+        assert_eq!(result, vec![a, b]);
+    }
+
+    #[test]
+    fn test_query_function_can_use_arbitrary_logic() {
+        let mut loc1 = IndexMap::new();
+        loc1.insert("x".to_string(), "1".to_string());
+
+        let mut loc2 = IndexMap::new();
+        loc2.insert("x".to_string(), "2".to_string());
+
+        let mut loc3 = IndexMap::new();
+        loc3.insert("x".to_string(), "3".to_string());
+
+        let a = generate_localized_shard(Some(loc1), None);
+        let b = generate_localized_shard(Some(loc2), None);
+        let c = generate_localized_shard(Some(loc3), None);
+        let root = generate_localized_shard(None, Some(vec![a, b.clone(), c]));
+
+        let result = find_shard(&[root], |shard| {
+            shard
+                .location
+                .get("x")
+                .and_then(|x| x.parse::<i32>().ok())
+                .map(|x| x % 2 == 0)
+                .unwrap_or(false)
+        });
+
+        assert_eq!(result, vec![b]);
+    }
+
+    #[test]
+    fn test_matches_only_when_dimension_present_and_equal() {
+        let mut loc_match = IndexMap::new();
+        loc_match.insert("file".to_string(), "a.md".to_string());
+        loc_match.insert("line".to_string(), "10".to_string());
+
+        let mut loc_wrong = IndexMap::new();
+        loc_wrong.insert("file".to_string(), "a.md".to_string());
+        loc_wrong.insert("line".to_string(), "11".to_string());
+
+        let mut loc_missing = IndexMap::new();
+        loc_missing.insert("file".to_string(), "a.md".to_string());
+
+        let match_shard = generate_localized_shard(Some(loc_match), None);
+        let wrong_value = generate_localized_shard(Some(loc_wrong), None);
+        let missing_dim = generate_localized_shard(Some(loc_missing), None);
+
+        let mut root_loc = IndexMap::new();
+        root_loc.insert("root".to_string(), "x".to_string());
+        let root = generate_localized_shard(
+            Some(root_loc),
+            Some(vec![match_shard.clone(), wrong_value, missing_dim]),
+        );
+
+        let result = find_shard_by_position(&[root], "line", "10");
+
+        assert_eq!(result, vec![match_shard]);
+    }
+
+    #[test]
+    fn test_recurses_through_children() {
+        let mut loc_deep = IndexMap::new();
+        loc_deep.insert("section".to_string(), "s1".to_string());
+        let deep = generate_localized_shard(Some(loc_deep), None);
+
+        let mut loc_mid = IndexMap::new();
+        loc_mid.insert("section".to_string(), "s0".to_string());
+        let mid = generate_localized_shard(Some(loc_mid), Some(vec![deep.clone()]));
+
+        let root = generate_localized_shard(None, Some(vec![mid]));
+
+        let result = find_shard_by_position(&[root], "section", "s1");
+
+        assert_eq!(result, vec![deep]);
+    }
+}
diff --git a/src/query/mod.rs b/src/query/mod.rs
new file mode 100644
index 0000000..9d9424d
--- /dev/null
+++ b/src/query/mod.rs
@@ -0,0 +1,3 @@
+mod find;
+
+pub use find::{find_shard, find_shard_by_position, find_shard_by_set_dimension};
diff --git a/src/streamd/__init__.py b/src/streamd/__init__.py
deleted file mode 100644
index c72d098..0000000
--- a/src/streamd/__init__.py
+++ /dev/null
@@ -1,126 +0,0 @@
-import glob
-import os
-from collections.abc import Generator
-from datetime import datetime
-from shutil import move
-from typing import Annotated
-
-import click
-import typer
-from rich import print
-from rich.markdown import Markdown
-from rich.panel import Panel
-
-from streamd.localize import (
-    LocalizedShard,
-    RepositoryConfiguration,
-    localize_stream_file,
-)
-from streamd.localize.preconfigured_configurations import TaskConfiguration
-from streamd.parse import parse_markdown_file
-from streamd.query import find_shard_by_position
-from streamd.settings import Settings
-from streamd.timesheet.configuration import BasicTimesheetConfiguration
-from streamd.timesheet.extract import extract_timesheets
-
-app = typer.Typer()
-
-
-def all_files(config: RepositoryConfiguration) -> Generator[LocalizedShard]:
-    for file_name in glob.glob(f"{glob.escape(Settings().base_folder)}/*.md"):
-        with open(file_name, "r") as file:
-            file_content = file.read()
-            if shard := localize_stream_file(
-                parse_markdown_file(file_name, file_content), config
-            ):
-                yield shard
-
-
-@app.command()
-def todo() -> None:
-    all_shards = list(all_files(TaskConfiguration))
-
-    for task_shard in find_shard_by_position(all_shards, "task", "open"):
-        with open(task_shard.location["file"], "r") as file:
-            file_content = file.read().splitlines()
-            print(
-                Panel(
-                    Markdown(
-                        "\n".join(
-                            file_content[
-                                task_shard.start_line - 1 : task_shard.end_line
-                            ]
-                        )
-                    ),
-                    title=f"{task_shard.location['file']}:{task_shard.start_line}",
-                )
-            )
-
-
-@app.command()
-def edit(number: Annotated[int, typer.Argument()] = 1) -> None:
-    all_shards = list(all_files(TaskConfiguration))
-    sorted_shards = sorted(all_shards, key=lambda s: s.moment)
-
-    if abs(number) >= len(sorted_shards):
-        raise ValueError("Argument out of range")
-
-    selected_number = number
-    if selected_number >= 0:
-        selected_number = len(sorted_shards) - selected_number
-    else:
-        selected_number = -selected_number
-
-    click.edit(None, filename=sorted_shards[selected_number].location["file"])
-
-
-@app.command()
-def timesheet() -> None:
-    all_shards = list(all_files(BasicTimesheetConfiguration))
-    sheets = sorted(extract_timesheets(all_shards), key=lambda card: card.date)
-    for sheet in sheets:
-        print(sheet.date)
-        print(
-            ",".join(
-                map(lambda card: f"{card.from_time},{card.to_time}", sheet.timecards)
-            ),
-        )
-
-
-@app.command()
-def new() -> None:
-    streamd_directory = Settings().base_folder
-
-    timestamp = datetime.now().strftime("%Y%m%d-%H%M%S")
-    preliminary_file_name = f"{timestamp}_wip.md"
-    prelimary_path = os.path.join(streamd_directory, preliminary_file_name)
-
-    content = "# "
-    with open(prelimary_path, "w") as file:
-        _ = file.write(content)
-
-    click.edit(None, filename=prelimary_path)
-
-    with open(prelimary_path, "r") as file:
-        content = file.read()
-    parsed_content = parse_markdown_file(prelimary_path, content)
-
-    final_file_name = f"{timestamp}.md"
-    if parsed_content.shard is not None and len(
-        markers := parsed_content.shard.markers
-    ):
-        final_file_name = f"{timestamp} {' '.join(markers)}.md"
-
-    final_path = os.path.join(streamd_directory, final_file_name)
-    _ = move(prelimary_path, final_path)
-    print(f"Saved as [yellow]{final_file_name}")
-
-
-@app.callback(invoke_without_command=True)
-def main(ctx: typer.Context):
-    if ctx.invoked_subcommand is None:
-        new()
-
-
-if __name__ == "__main__":
-    app()
diff --git a/src/streamd/localize/__init__.py b/src/streamd/localize/__init__.py
deleted file mode 100644
index 97456a2..0000000
--- a/src/streamd/localize/__init__.py
+++ /dev/null
@@ -1,9 +0,0 @@
-from .localize import localize_stream_file
-from .localized_shard import LocalizedShard
-from .repository_configuration import RepositoryConfiguration
-
-__all__ = [
-    "RepositoryConfiguration",
-    "localize_stream_file",
-    "LocalizedShard",
-]
diff --git a/src/streamd/localize/extract_datetime.py b/src/streamd/localize/extract_datetime.py
deleted file mode 100644
index df15935..0000000
--- a/src/streamd/localize/extract_datetime.py
+++ /dev/null
@@ -1,92 +0,0 @@
-import os
-import re
-from datetime import date, datetime, time
-
-
-def extract_datetime_from_file_name(file_name: str) -> datetime | None:
-    FILE_NAME_REGEX = r"^(?P<date>\d{8})(?:-(?P<time>\d{4,6}))?.+.md$"
-    base_name = os.path.basename(file_name)
-    match = re.match(FILE_NAME_REGEX, base_name)
-
-    if match:
-        date_str = match.group("date")
-        time_str = match.group("time") or ""
-        time_str = time_str.ljust(6, "0")
-        datetime_str = f"{date_str} {time_str[:2]}:{time_str[2:4]}:{time_str[4:]}"
-        return datetime.strptime(datetime_str, "%Y%m%d %H:%M:%S")
-    return None
-
-
-def extract_datetime_from_marker(marker: str) -> datetime | None:
-    """
-    Extract a datetime from a marker string in the exact format: YYYYMMDDHHMMSS.
-
-    Returns:
-        Parsed datetime if the format is fulfilled and values are valid, else None.
-    """
-    if not re.fullmatch(r"\d{14}", marker or ""):
-        return None
-    try:
-        return datetime.strptime(marker, "%Y%m%d%H%M%S")
-    except ValueError:
-        return None
-
-
-def extract_date_from_marker(marker: str) -> date | None:
-    """
-    Extract a date from a marker string in the exact format: YYYYMMDD.
-
-    Returns:
-        Parsed date if the format is fulfilled and values are valid, else None.
-    """
-    if not re.fullmatch(r"\d{8}", marker or ""):
-        return None
-    try:
-        return datetime.strptime(marker, "%Y%m%d").date()
-    except ValueError:
-        return None
-
-
-def extract_time_from_marker(marker: str) -> time | None:  # noqa: F821
-    """
-    Extract a time from a marker string in the exact format: HHMMSS.
-
-    Returns:
-        Parsed time if the format is fulfilled and values are valid, else None.
-    """
-    if not re.fullmatch(r"\d{6}", marker or ""):
-        return None
-    try:
-        return datetime.strptime(marker, "%H%M%S").time()
-    except ValueError:
-        return None
-
-
-def extract_datetime_from_marker_list(markers: list[str], inherited_datetime: datetime):
-    shard_time: time | None = None
-    shard_date: date | None = None
-
-    for marker in markers[::-1]:
-        if parsed_time := extract_time_from_marker(marker):
-            shard_time = parsed_time
-        if parsed_date := extract_date_from_marker(marker):
-            shard_date = parsed_date
-        if parsed_datetime := extract_datetime_from_marker(marker):
-            shard_date = parsed_datetime.date()
-            shard_time = parsed_datetime.time()
-
-    if shard_date and not shard_time:
-        return datetime.combine(shard_date, time(0, 0, 0))
-
-    return datetime.combine(
-        shard_date or inherited_datetime.date(), shard_time or inherited_datetime.time()
-    )
-
-
-__all__ = [
-    "extract_datetime_from_file_name",
-    "extract_datetime_from_marker",
-    "extract_date_from_marker",
-    "extract_time_from_marker",
-    "extract_datetime_from_marker_list",
-]
diff --git a/src/streamd/localize/localize.py b/src/streamd/localize/localize.py
deleted file mode 100644
index bc084f4..0000000
--- a/src/streamd/localize/localize.py
+++ /dev/null
@@ -1,73 +0,0 @@
-from datetime import datetime
-
-from streamd.parse.shard import Shard, StreamFile
-
-from .extract_datetime import (
-    extract_datetime_from_file_name,
-    extract_datetime_from_marker_list,
-)
-from .localized_shard import LocalizedShard
-from .repository_configuration import RepositoryConfiguration
-
-
-def localize_shard(
-    shard: Shard,
-    config: RepositoryConfiguration,
-    propagated: dict[str, str],
-    moment: datetime,
-) -> LocalizedShard:
-    position = {**propagated}
-    private_position: dict[str, str] = {}
-
-    adjusted_moment: datetime = extract_datetime_from_marker_list(shard.markers, moment)
-
-    for marker in shard.markers:
-        if marker in config.markers:
-            marker_definition = config.markers[marker]
-            for placement in marker_definition.placements:
-                if placement.if_with <= set(shard.markers):
-                    dimension = config.dimensions[placement.dimension]
-
-                    value = placement.value or marker
-
-                    if placement.overwrites or (
-                        placement.dimension not in position
-                        and placement.dimension not in private_position
-                    ):
-                        if dimension.propagate:
-                            position[placement.dimension] = value
-                        else:
-                            private_position[placement.dimension] = value
-
-    children = [
-        localize_shard(child, config, position, adjusted_moment)
-        for child in shard.children
-    ]
-
-    position.update(private_position)
-
-    return LocalizedShard(
-        markers=shard.markers,
-        tags=shard.tags,
-        start_line=shard.start_line,
-        end_line=shard.end_line,
-        location=position,
-        children=children,
-        moment=adjusted_moment,
-    )
-
-
-def localize_stream_file(
-    stream_file: StreamFile, config: RepositoryConfiguration
-) -> LocalizedShard | None:
-    shard_date = extract_datetime_from_file_name(stream_file.file_name)
-
-    if not shard_date or not stream_file.shard:
-        raise ValueError("Could not extract date")
-
-    return localize_shard(
-        stream_file.shard, config, {"file": stream_file.file_name}, shard_date
-    )
-
-
-__all__ = ["localize_stream_file"]
diff --git a/src/streamd/localize/localized_shard.py b/src/streamd/localize/localized_shard.py
deleted file mode 100644
index 871af20..0000000
--- a/src/streamd/localize/localized_shard.py
+++ /dev/null
@@ -1,14 +0,0 @@
-from __future__ import annotations
-
-from datetime import datetime
-
-from streamd.parse.shard import Shard
-
-
-class LocalizedShard(Shard):
-    moment: datetime
-    location: dict[str, str]
-    children: list[LocalizedShard] = []  # pyright: ignore[reportIncompatibleVariableOverride]
-
-
-__all__ = ["LocalizedShard"]
diff --git a/src/streamd/localize/preconfigured_configurations.py b/src/streamd/localize/preconfigured_configurations.py
deleted file mode 100644
index a949ddc..0000000
--- a/src/streamd/localize/preconfigured_configurations.py
+++ /dev/null
@@ -1,43 +0,0 @@
-from streamd.localize.repository_configuration import (
-    Dimension,
-    Marker,
-    MarkerPlacement,
-    RepositoryConfiguration,
-)
-
-TaskConfiguration = RepositoryConfiguration(
-    dimensions={
-        "task": Dimension(
-            display_name="Task",
-            comment="If placed, the given shard is a task. The placement determines the state.",
-            propagate=False,
-        ),
-        "project": Dimension(
-            display_name="Project",
-            comment="Project the task is attached to",
-            propagate=True,
-        ),
-    },
-    markers={
-        "Task": Marker(
-            display_name="Task",
-            placements=[
-                MarkerPlacement(dimension="task", value="open"),
-                MarkerPlacement(if_with={"Done"}, dimension="task", value="done"),
-                MarkerPlacement(if_with={"Waiting"}, dimension="task", value="waiting"),
-                MarkerPlacement(
-                    if_with={"Cancelled"}, dimension="task", value="cancelled"
-                ),
-                MarkerPlacement(
-                    if_with={"NotDone"}, dimension="task", value="cancelled"
-                ),
-            ],
-        ),
-        "WaitingFor": Marker(
-            display_name="Task",
-            placements=[
-                MarkerPlacement(dimension="task", value="waiting"),
-            ],
-        ),
-    },
-)
diff --git a/src/streamd/localize/repository_configuration.py b/src/streamd/localize/repository_configuration.py
deleted file mode 100644
index 4b83a03..0000000
--- a/src/streamd/localize/repository_configuration.py
+++ /dev/null
@@ -1,106 +0,0 @@
-from __future__ import annotations
-
-from pydantic import BaseModel
-
-
-class Dimension(BaseModel):
-    display_name: str
-    comment: str | None = None
-    propagate: bool = False
-
-
-class MarkerPlacement(BaseModel):
-    if_with: set[str] = set()
-    dimension: str
-    value: str | None = None
-    overwrites: bool = True
-
-
-class Marker(BaseModel):
-    display_name: str
-    placements: list[MarkerPlacement] = []
-
-
-class RepositoryConfiguration(BaseModel):
-    dimensions: dict[str, Dimension]
-    markers: dict[str, Marker]
-
-
-def merge_single_dimension(base: Dimension, second: Dimension) -> Dimension:
-    second_fields_set: set[str] = getattr(second, "model_fields_set", set())
-
-    return Dimension(
-        display_name=second.display_name or base.display_name,
-        comment=base.comment if second.comment is None else second.comment,
-        propagate=second.propagate
-        if "propagate" in second_fields_set
-        else base.propagate,
-    )
-
-
-def merge_dimensions(
-    base: dict[str, Dimension], second: dict[str, Dimension]
-) -> dict[str, Dimension]:
-    merged: dict[str, Dimension] = dict(base)
-    for key, second_dimension in second.items():
-        if key in merged:
-            merged[key] = merge_single_dimension(merged[key], second_dimension)
-        else:
-            merged[key] = second_dimension
-    return merged
-
-
-def _placement_identity(p: MarkerPlacement) -> tuple[frozenset[str], str]:
-    return (frozenset(p.if_with), p.dimension)
-
-
-def merge_single_marker(base: Marker, second: Marker) -> Marker:
-    merged_display_name = second.display_name or base.display_name
-
-    merged_placements: list[MarkerPlacement] = []
-    seen: dict[tuple[frozenset[str], str], int] = {}
-
-    for placement in base.placements:
-        ident = _placement_identity(placement)
-        seen[ident] = len(merged_placements)
-        merged_placements.append(placement)
-
-    for placement in second.placements:
-        ident = _placement_identity(placement)
-        if ident in seen:
-            merged_placements[seen[ident]] = placement
-        else:
-            seen[ident] = len(merged_placements)
-            merged_placements.append(placement)
-
-    return Marker(display_name=merged_display_name, placements=merged_placements)
-
-
-def merge_markers(
-    base: dict[str, Marker], second: dict[str, Marker]
-) -> dict[str, Marker]:
-    merged: dict[str, Marker] = dict(base)
-    for key, second_marker in second.items():
-        if key in merged:
-            merged[key] = merge_single_marker(merged[key], second_marker)
-        else:
-            merged[key] = second_marker
-    return merged
-
-
-def merge_repository_configuration(
-    base: RepositoryConfiguration, second: RepositoryConfiguration
-) -> RepositoryConfiguration:
-    return RepositoryConfiguration(
-        dimensions=merge_dimensions(base.dimensions, second.dimensions),
-        markers=merge_markers(base.markers, second.markers),
-    )
-
-
-__all__ = [
-    "Dimension",
-    "Marker",
-    "MarkerPlacement",
-    "RepositoryConfiguration",
-    "merge_repository_configuration",
-]
diff --git a/src/streamd/parse/__init__.py b/src/streamd/parse/__init__.py
deleted file mode 100644
index 9b2d2c0..0000000
--- a/src/streamd/parse/__init__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from .shard import Shard, StreamFile
-from .parse import parse_markdown_file
-
-__all__ = ["Shard", "StreamFile", "parse_markdown_file"]
diff --git a/src/streamd/parse/extract_tag.py b/src/streamd/parse/extract_tag.py
deleted file mode 100644
index b7bfd45..0000000
--- a/src/streamd/parse/extract_tag.py
+++ /dev/null
@@ -1,92 +0,0 @@
-import re
-from collections.abc import Iterable
-from typing import cast
-
-from mistletoe.block_token import BlockToken
-from mistletoe.span_token import Emphasis, Link, RawText, Strikethrough, Strong
-from mistletoe.token import Token
-
-from .markdown_tag import Tag
-
-
-def extract_markers_and_tags_from_single_token(
-    token: Token,
-    marker_boundary_encountered: bool,
-    return_at_first_marker: bool = False,
-) -> tuple[list[str], list[str], bool]:
-    result_markers: list[str] = []
-    result_tags: list[str] = []
-    result_marker_boundary_encountered = marker_boundary_encountered
-
-    if isinstance(token, Tag):
-        content = cast(str, token.content)
-        if marker_boundary_encountered:
-            result_tags.append(content)
-        else:
-            result_markers.append(content)
-    elif isinstance(token, (Emphasis, Strong, Strikethrough, Link)):
-        children = list(token.children or [])
-        markers, tags, child_marker_boundary_encountered = (
-            extract_markers_and_tags_from_tokens(
-                children,
-                marker_boundary_encountered,
-                return_at_first_marker,
-            )
-        )
-        result_markers.extend(markers)
-        result_tags.extend(tags)
-        result_marker_boundary_encountered = (
-            marker_boundary_encountered or child_marker_boundary_encountered
-        )
-    elif isinstance(token, RawText):
-        content_raw = cast(str, token.content)
-        if not re.match(r"^[\s]*$", content_raw):
-            result_marker_boundary_encountered = True
-    else:
-        result_marker_boundary_encountered = True
-
-    return result_markers, result_tags, result_marker_boundary_encountered
-
-
-def extract_markers_and_tags_from_tokens(
-    tokens: Iterable[Token],
-    marker_boundary_encountered: bool,
-    return_at_first_marker: bool = False,
-) -> tuple[list[str], list[str], bool]:
-    result_markers: list[str] = []
-    result_tags: list[str] = []
-    result_marker_boundary_encountered = marker_boundary_encountered
-
-    for child in tokens:
-        markers, tags, child_marker_boundary_encountered = (
-            extract_markers_and_tags_from_single_token(
-                child, result_marker_boundary_encountered, return_at_first_marker
-            )
-        )
-        result_markers.extend(markers)
-        result_tags.extend(tags)
-        result_marker_boundary_encountered = (
-            marker_boundary_encountered or child_marker_boundary_encountered
-        )
-
-        if len(result_markers) > 0 and return_at_first_marker:
-            break
-
-    return result_markers, result_tags, result_marker_boundary_encountered
-
-
-def extract_markers_and_tags(block_token: BlockToken) -> tuple[list[str], list[str]]:
-    children = list(block_token.children or [])
-    markers, tags, _ = extract_markers_and_tags_from_tokens(children, False)
-    return markers, tags
-
-
-def has_markers(block_token: BlockToken) -> bool:
-    children = list(block_token.children or [])
-    markers, _, _ = extract_markers_and_tags_from_tokens(
-        children, False, return_at_first_marker=True
-    )
-    return len(markers) > 0
-
-
-__all__ = ["extract_markers_and_tags", "has_markers"]
diff --git a/src/streamd/parse/list.py b/src/streamd/parse/list.py
deleted file mode 100644
index 730ea35..0000000
--- a/src/streamd/parse/list.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from itertools import pairwise
-from typing import TypeVar
-
-A = TypeVar("A")
-
-
-def split_at(list_to_be_split: list[A], positions: list[int]):
-    positions = sorted(set([0, *positions, len(list_to_be_split)]))
-
-    return [list_to_be_split[left:right] for left, right in pairwise(positions)]
-
-
-__all__ = ["split_at"]
diff --git a/src/streamd/parse/markdown_tag.py b/src/streamd/parse/markdown_tag.py
deleted file mode 100644
index 798f10e..0000000
--- a/src/streamd/parse/markdown_tag.py
+++ /dev/null
@@ -1,23 +0,0 @@
-import re
-from typing import cast
-
-from mistletoe.markdown_renderer import Fragment, MarkdownRenderer
-from mistletoe.span_token import SpanToken
-
-
-class Tag(SpanToken):
-    parse_inner: bool = False
-    pattern: re.Pattern[str] = re.compile(r"@([^\s*\x60~\[\]]+)")
-
-
-class TagMarkdownRenderer(MarkdownRenderer):
-    def __init__(self) -> None:
-        super().__init__(Tag)  # pyright: ignore[reportUnknownMemberType]
-
-    def render_tag(self, token: Tag):
-        content = cast(str, token.content)
-        yield Fragment("@")
-        yield Fragment(content)
-
-
-__all__ = ["Tag", "TagMarkdownRenderer"]
diff --git a/src/streamd/parse/parse.py b/src/streamd/parse/parse.py
deleted file mode 100644
index 4d14fa3..0000000
--- a/src/streamd/parse/parse.py
+++ /dev/null
@@ -1,258 +0,0 @@
-from collections import Counter
-from typing import cast
-
-from mistletoe.block_token import (
-    BlockToken,
-    Document,
-    Heading,
-    List,
-    ListItem,
-    Paragraph,
-)
-
-from .extract_tag import extract_markers_and_tags, has_markers
-from .list import split_at
-from .markdown_tag import TagMarkdownRenderer
-from .shard import Shard, StreamFile
-
-
-def get_line_number(block_token: BlockToken) -> int:
-    return cast(int, block_token.line_number)  # pyright: ignore[reportAttributeAccessIssue]
-
-
-def build_shard(
-    start_line: int,
-    end_line: int,
-    markers: list[str] | None = None,
-    tags: list[str] | None = None,
-    children: list[Shard] | None = None,
-) -> Shard:
-    markers = markers or []
-    tags = tags or []
-    children = children or []
-
-    if (
-        len(children) == 1
-        and len(tags) == 0
-        and len(markers) == 0
-        and children[0].start_line == start_line
-        and children[0].end_line == end_line
-    ):
-        return children[0]
-
-    return Shard(
-        markers=markers,
-        tags=tags,
-        children=children,
-        start_line=start_line,
-        end_line=end_line,
-    )
-
-
-def merge_into_first_shard(
-    shards: list[Shard],
-    start_line: int,
-    end_line: int,
-    additional_tags: list[str] | None = None,
-) -> Shard:
-    return shards[0].model_copy(
-        update={
-            "start_line": start_line,
-            "end_line": end_line,
-            "children": shards[1:],
-            "tags": shards[0].tags + (additional_tags or []),
-        }
-    )
-
-
-def find_paragraph_shard_positions(block_tokens: list[BlockToken]) -> list[int]:
-    return [
-        index
-        for index, block_token in enumerate(block_tokens)
-        if isinstance(block_token, Paragraph) and has_markers(block_token)
-    ]
-
-
-def _heading_level(heading: Heading) -> int:
-    return cast(int, heading.level)
-
-
-def find_headings_by_level(
-    block_tokens: list[BlockToken], header_level: int
-) -> list[int]:
-    return [
-        index
-        for index, block_token in enumerate(block_tokens)
-        if isinstance(block_token, Heading)
-        and _heading_level(block_token) == header_level
-    ]
-
-
-def calculate_heading_level_for_next_split(
-    block_tokens: list[BlockToken],
-) -> int | None:
-    """
-    If there is no marker in any heading, then return None.
-    If only the first token is a heading with a marker, then return None.
-    Otherwise: Return the heading level with the lowest level (h1 < h2), of which there are two or which has a marker (and doesn't stem from first)
-    """
-    level_of_headings_without_first_with_marker: list[int] = [
-        _heading_level(token)
-        for token in block_tokens[1:]
-        if isinstance(token, Heading) and has_markers(token)
-    ]
-
-    if len(level_of_headings_without_first_with_marker) == 0:
-        return None
-
-    heading_level_counter: Counter[int] = Counter(
-        [_heading_level(token) for token in block_tokens if isinstance(token, Heading)]
-    )
-
-    return min(
-        [level for level, count in heading_level_counter.items() if count >= 2]
-        + level_of_headings_without_first_with_marker
-    )
-
-
-def parse_single_block_shards(
-    block_token: BlockToken, start_line: int, end_line: int
-) -> tuple[Shard | None, list[str]]:
-    markers: list[str] = []
-    tags: list[str] = []
-    children: list[Shard] = []
-
-    if isinstance(block_token, List):
-        list_items: list[ListItem] = (  # pyright: ignore[reportAssignmentType]
-            list(block_token.children) if block_token.children is not None else []
-        )
-        for index, list_item in enumerate(list_items):
-            list_item_start_line = get_line_number(list_item)
-            list_item_end_line = (
-                get_line_number(list_items[index + 1]) - 1
-                if index + 1 < len(list_items)
-                else end_line
-            )
-            list_item_shard, list_item_tags = parse_multiple_block_shards(
-                list_item.children,  # pyright: ignore[reportArgumentType]
-                list_item_start_line,
-                list_item_end_line,
-            )
-            if list_item_shard is not None:
-                children.append(list_item_shard)
-            tags.extend(list_item_tags)
-
-    elif isinstance(block_token, (Paragraph, Heading)):
-        markers, tags = extract_markers_and_tags(block_token)
-
-    if len(markers) == 0 and len(children) == 0:
-        return None, tags
-
-    return build_shard(
-        start_line, end_line, markers=markers, tags=tags, children=children
-    ), []
-
-
-def parse_multiple_block_shards(
-    block_tokens: list[BlockToken],
-    start_line: int,
-    end_line: int,
-    enforce_shard: bool = False,
-) -> tuple[Shard | None, list[str]]:
-    is_first_block_heading = isinstance(block_tokens[0], Heading) and has_markers(
-        block_tokens[0]
-    )
-
-    paragraph_positions = find_paragraph_shard_positions(block_tokens)
-    children: list[Shard] = []
-    tags: list[str] = []
-
-    is_first_block_only_with_marker = False
-
-    for i, token in enumerate(block_tokens):
-        if i in paragraph_positions:
-            is_first_block_only_with_marker = i == 0
-
-        child_start_line = get_line_number(token)
-        child_end_line = (
-            get_line_number(block_tokens[i + 1]) - 1
-            if i + 1 < len(block_tokens)
-            else end_line
-        )
-
-        child_shard, child_tags = parse_single_block_shards(
-            token, child_start_line, child_end_line
-        )
-
-        if child_shard is not None:
-            children.append(child_shard)
-        if len(child_tags) > 0:
-            tags.extend(child_tags)
-
-    if len(children) == 0 and not enforce_shard:
-        return None, tags
-    if is_first_block_heading or is_first_block_only_with_marker:
-        return merge_into_first_shard(children, start_line, end_line, tags), []
-    else:
-        return build_shard(start_line, end_line, tags=tags, children=children), []
-
-
-def parse_header_shards(
-    block_tokens: list[BlockToken],
-    start_line: int,
-    end_line: int,
-    use_first_child_as_header: bool = False,
-) -> Shard | None:
-    if len(block_tokens) == 0:
-        return build_shard(start_line, end_line)
-
-    split_at_heading_level = calculate_heading_level_for_next_split(block_tokens)
-
-    if split_at_heading_level is None:
-        return parse_multiple_block_shards(
-            block_tokens, start_line, end_line, enforce_shard=True
-        )[0]
-
-    heading_positions = find_headings_by_level(block_tokens, split_at_heading_level)
-
-    block_tokens_split_by_heading = split_at(block_tokens, heading_positions)
-
-    children: list[Shard] = []
-    for i, child_blocks in enumerate(block_tokens_split_by_heading):
-        child_start_line = get_line_number(child_blocks[0])
-        child_end_line = (
-            get_line_number(block_tokens_split_by_heading[i + 1][0]) - 1
-            if i + 1 < len(block_tokens_split_by_heading)
-            else end_line
-        )
-        if child_shard := parse_header_shards(
-            child_blocks,
-            child_start_line,
-            child_end_line,
-            use_first_child_as_header=i > 0 or 0 in heading_positions,
-        ):
-            children.append(child_shard)
-
-    if use_first_child_as_header and len(children) > 0:
-        return merge_into_first_shard(children, start_line, end_line)
-    else:
-        return build_shard(start_line, end_line, children=children)
-
-
-def parse_markdown_file(file_name: str, file_content: str) -> StreamFile:
-    shard = build_shard(1, max([len(file_content.splitlines()), 1]))
-
-    with TagMarkdownRenderer():
-        ast = Document(file_content)
-
-        block_tokens: list[BlockToken] = ast.children  # pyright: ignore[reportAssignmentType]
-        if len(block_tokens) > 0:
-            if parsed_shard := parse_header_shards(
-                block_tokens, shard.start_line, shard.end_line
-            ):
-                shard = parsed_shard
-
-    return StreamFile(shard=shard, file_name=file_name)
-
-
-__all__ = ["Shard", "StreamFile", "parse_markdown_file"]
diff --git a/src/streamd/parse/shard.py b/src/streamd/parse/shard.py
deleted file mode 100644
index 65432c3..0000000
--- a/src/streamd/parse/shard.py
+++ /dev/null
@@ -1,19 +0,0 @@
-from __future__ import annotations
-
-from pydantic import BaseModel
-
-
-class Shard(BaseModel):
-    markers: list[str] = []
-    tags: list[str] = []
-    start_line: int
-    end_line: int
-    children: list[Shard] = []
-
-
-class StreamFile(BaseModel):
-    file_name: str
-    shard: Shard | None = None
-
-
-__all__ = ["Shard", "StreamFile"]
diff --git a/src/streamd/query/__init__.py b/src/streamd/query/__init__.py
deleted file mode 100644
index b0b08c3..0000000
--- a/src/streamd/query/__init__.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from .find import find_shard, find_shard_by_position
-
-__all__ = ["find_shard_by_position", "find_shard"]
diff --git a/src/streamd/query/find.py b/src/streamd/query/find.py
deleted file mode 100644
index 428e05a..0000000
--- a/src/streamd/query/find.py
+++ /dev/null
@@ -1,36 +0,0 @@
-from typing import Callable
-
-from streamd.localize import LocalizedShard
-
-
-def find_shard(
-    shards: list[LocalizedShard], query_function: Callable[[LocalizedShard], bool]
-) -> list[LocalizedShard]:
-    found_shards: list[LocalizedShard] = []
-
-    for shard in shards:
-        if query_function(shard):
-            found_shards.append(shard)
-        found_shards.extend(find_shard(shard.children, query_function))
-
-    return found_shards
-
-
-def find_shard_by_position(
-    shards: list[LocalizedShard], dimension: str, value: str
-) -> list[LocalizedShard]:
-    return find_shard(
-        shards,
-        lambda shard: (
-            dimension in shard.location and shard.location[dimension] == value
-        ),
-    )
-
-
-def find_shard_by_set_dimension(
-    shards: list[LocalizedShard], dimension: str
-) -> list[LocalizedShard]:
-    return find_shard(shards, lambda shard: dimension in shard.location)
-
-
-__all__ = ["find_shard_by_position", "find_shard", "find_shard_by_set_dimension"]
diff --git a/src/streamd/settings/__init__.py b/src/streamd/settings/__init__.py
deleted file mode 100644
index bdf28b4..0000000
--- a/src/streamd/settings/__init__.py
+++ /dev/null
@@ -1,38 +0,0 @@
-import os
-from typing import ClassVar, override
-
-from pydantic_settings import (
-    BaseSettings,
-    PydanticBaseSettingsSource,
-    SettingsConfigDict,
-    YamlConfigSettingsSource,
-)
-from xdg_base_dirs import xdg_config_home
-
-SETTINGS_FILE = xdg_config_home() / "streamd" / "config.yaml"
-
-
-class Settings(BaseSettings):
-    model_config: ClassVar[SettingsConfigDict] = SettingsConfigDict(
-        env_file_encoding="utf-8"
-    )
-
-    base_folder: str = os.getcwd()
-
-    @classmethod
-    @override
-    def settings_customise_sources(
-        cls,
-        settings_cls: type[BaseSettings],
-        init_settings: PydanticBaseSettingsSource,
-        env_settings: PydanticBaseSettingsSource,
-        dotenv_settings: PydanticBaseSettingsSource,
-        file_secret_settings: PydanticBaseSettingsSource,
-    ) -> tuple[PydanticBaseSettingsSource, ...]:
-        return (
-            init_settings,
-            YamlConfigSettingsSource(settings_cls, yaml_file=SETTINGS_FILE),
-            dotenv_settings,
-            env_settings,
-            file_secret_settings,
-        )
diff --git a/src/streamd/timesheet/configuration.py b/src/streamd/timesheet/configuration.py
deleted file mode 100644
index 8453dc9..0000000
--- a/src/streamd/timesheet/configuration.py
+++ /dev/null
@@ -1,115 +0,0 @@
-from enum import StrEnum
-
-from streamd.localize import RepositoryConfiguration
-from streamd.localize.repository_configuration import (
-    Dimension,
-    Marker,
-    MarkerPlacement,
-)
-
-TIMESHEET_TAG = "Timesheet"
-TIMESHEET_DIMENSION_NAME = "timesheet"
-
-
-class TimesheetPointType(StrEnum):
-    Card = "CARD"
-    SickLeave = "SICK_LEAVE"
-    Vacation = "VACATION"
-    Undertime = "UNDERTIME"
-    Holiday = "HOLIDAY"
-    Break = "BREAK"
-
-
-BasicTimesheetConfiguration = RepositoryConfiguration(
-    dimensions={
-        TIMESHEET_DIMENSION_NAME: Dimension(
-            display_name="Timesheet",
-            comment="Used by Timesheet-Subcommand to create Timecards",
-            propagate=False,
-        )
-    },
-    markers={
-        TIMESHEET_TAG: Marker(
-            display_name="A default time card",
-            placements=[
-                MarkerPlacement(
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.Card.value,
-                    overwrites=False,
-                )
-            ],
-        ),
-        "VacationDay": Marker(
-            display_name="Vacation Day",
-            placements=[
-                MarkerPlacement(
-                    if_with={TIMESHEET_TAG},
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.Vacation.value,
-                )
-            ],
-        ),
-        "Break": Marker(
-            display_name="Break",
-            placements=[
-                MarkerPlacement(
-                    if_with={TIMESHEET_TAG},
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.Break.value,
-                )
-            ],
-        ),
-        "LunchBreak": Marker(
-            display_name="Break",
-            placements=[
-                MarkerPlacement(
-                    if_with={TIMESHEET_TAG},
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.Break.value,
-                )
-            ],
-        ),
-        "Feierabend": Marker(
-            display_name="Break",
-            placements=[
-                MarkerPlacement(
-                    if_with={TIMESHEET_TAG},
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.Break.value,
-                )
-            ],
-        ),
-        "Holiday": Marker(
-            display_name="Offical Holiday",
-            placements=[
-                MarkerPlacement(
-                    if_with={TIMESHEET_TAG},
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.Holiday.value,
-                )
-            ],
-        ),
-        "SickLeave": Marker(
-            display_name="Sick Leave",
-            placements=[
-                MarkerPlacement(
-                    if_with={TIMESHEET_TAG},
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.SickLeave.value,
-                )
-            ],
-        ),
-        "UndertimeDay": Marker(
-            display_name="Undertime Leave",
-            placements=[
-                MarkerPlacement(
-                    if_with={TIMESHEET_TAG},
-                    dimension=TIMESHEET_DIMENSION_NAME,
-                    value=TimesheetPointType.Undertime.value,
-                )
-            ],
-        ),
-    },
-)
-
-__all__ = ["BasicTimesheetConfiguration", "TIMESHEET_TAG", "TIMESHEET_DIMENSION_NAME"]
diff --git a/src/streamd/timesheet/extract.py b/src/streamd/timesheet/extract.py
deleted file mode 100644
index 0754f7d..0000000
--- a/src/streamd/timesheet/extract.py
+++ /dev/null
@@ -1,113 +0,0 @@
-from datetime import datetime
-from itertools import groupby
-
-from pydantic import BaseModel
-from streamd.localize import LocalizedShard
-from streamd.query.find import find_shard_by_set_dimension
-
-from .configuration import TIMESHEET_DIMENSION_NAME, TimesheetPointType
-from .timecard import SpecialDayType, Timecard, Timesheet
-
-
-class TimesheetPoint(BaseModel):
-    moment: datetime
-    type: TimesheetPointType
-
-
-def shard_to_timesheet_point(shard: LocalizedShard) -> TimesheetPoint:
-    return TimesheetPoint(
-        moment=shard.moment,
-        type=TimesheetPointType(shard.location[TIMESHEET_DIMENSION_NAME]),
-    )
-
-
-def shards_to_timesheet_points(shards: list[LocalizedShard]) -> list[TimesheetPoint]:
-    return list(
-        map(
-            shard_to_timesheet_point,
-            find_shard_by_set_dimension(shards, TIMESHEET_DIMENSION_NAME),
-        )
-    )
-
-
-def aggregate_timecard_day(points: list[TimesheetPoint]) -> Timesheet | None:
-    sorted_points = sorted(points, key=lambda point: point.moment)
-
-    is_sick_leave = False
-    special_day_type = None
-
-    card_date = sorted_points[0].moment.date()
-
-    # We expect timesheet points to alternate between "Card" (start work) and
-    # "Break" (end work). Starting in "break" means we are not currently in a
-    # work block until we see the first Card.
-    last_is_break = True
-    last_time = sorted_points[0].moment.time()
-
-    timecards: list[Timecard] = []
-    for point in sorted_points:
-        if point.moment.date() != card_date:
-            raise ValueError("Dates of all given timesheet days should be consistent")
-
-        point_time = point.moment.time()
-
-        match point.type:
-            case TimesheetPointType.Holiday:
-                if special_day_type is not None:
-                    raise ValueError(
-                        f"{card_date} is both {point.type} and {special_day_type}"
-                    )
-                special_day_type = SpecialDayType.Holiday
-            case TimesheetPointType.Vacation:
-                if special_day_type is not None:
-                    raise ValueError(
-                        f"{card_date} is both {point.type} and {special_day_type}"
-                    )
-                special_day_type = SpecialDayType.Vacation
-            case TimesheetPointType.Undertime:
-                if special_day_type is not None:
-                    raise ValueError(
-                        f"{card_date} is both {point.type} and {special_day_type}"
-                    )
-                special_day_type = SpecialDayType.Undertime
-            case TimesheetPointType.SickLeave:
-                is_sick_leave = True
-            case TimesheetPointType.Break:
-                if not last_is_break:
-                    timecards.append(Timecard(from_time=last_time, to_time=point_time))
-                    last_is_break = True
-                    last_time = point_time
-            case TimesheetPointType.Card:
-                if last_is_break:
-                    last_is_break = False
-                    last_time = point_time
-
-    if not last_is_break:
-        raise ValueError(f"Last Timecard of {card_date} is not a break!")
-
-    if len(timecards) == 0 and not is_sick_leave and special_day_type is None:
-        return None
-
-    return Timesheet(
-        date=card_date,
-        is_sick_leave=is_sick_leave,
-        special_day_type=special_day_type,
-        timecards=timecards,
-    )
-
-
-def aggregate_timecards(points: list[TimesheetPoint]) -> list[Timesheet]:
-    day_timecards = [
-        aggregate_timecard_day(list(timecard))
-        for _date, timecard in groupby(points, key=lambda point: point.moment.date())
-    ]
-
-    return [timecard for timecard in day_timecards if timecard is not None]
-
-
-def extract_timesheets(shards: list[LocalizedShard]) -> list[Timesheet]:
-    points = shards_to_timesheet_points(shards)
-    return aggregate_timecards(points)
-
-
-__all__ = ["extract_timesheets"]
diff --git a/src/streamd/timesheet/timecard.py b/src/streamd/timesheet/timecard.py
deleted file mode 100644
index f236d00..0000000
--- a/src/streamd/timesheet/timecard.py
+++ /dev/null
@@ -1,23 +0,0 @@
-from datetime import date, time
-from enum import StrEnum
-
-from pydantic import BaseModel
-
-
-class SpecialDayType(StrEnum):
-    Vacation = "VACATION"
-    Undertime = "UNDERTIME"
-    Holiday = "HOLIDAY"
-    Weekend = "WEEKEND"
-
-
-class Timecard(BaseModel):
-    from_time: time
-    to_time: time
-
-
-class Timesheet(BaseModel):
-    date: date
-    is_sick_leave: bool = False
-    special_day_type: SpecialDayType | None = None
-    timecards: list[Timecard]
diff --git a/src/timesheet/configuration.rs b/src/timesheet/configuration.rs
new file mode 100644
index 0000000..6e6a851
--- /dev/null
+++ b/src/timesheet/configuration.rs
@@ -0,0 +1,84 @@
+use once_cell::sync::Lazy;
+
+use crate::models::{Dimension, Marker, MarkerPlacement, RepositoryConfiguration};
+
+use super::TimesheetPointType;
+
+pub const TIMESHEET_TAG: &str = "Timesheet";
+pub const TIMESHEET_DIMENSION_NAME: &str = "timesheet";
+
+/// Pre-configured repository configuration for timesheet tracking.
+#[allow(non_upper_case_globals)]
+pub static BasicTimesheetConfiguration: Lazy<RepositoryConfiguration> = Lazy::new(|| {
+    RepositoryConfiguration::new()
+        .with_dimension(
+            TIMESHEET_DIMENSION_NAME,
+            Dimension::new("Timesheet")
+                .with_comment("Used by Timesheet-Subcommand to create Timecards")
+                .with_propagate(false),
+        )
+        .with_marker(
+            TIMESHEET_TAG,
+            Marker::new("A default time card").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_value(TimesheetPointType::Card.as_str())
+            .with_overwrites(false)]),
+        )
+        .with_marker(
+            "VacationDay",
+            Marker::new("Vacation Day").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_if_with(vec![TIMESHEET_TAG])
+            .with_value(TimesheetPointType::Vacation.as_str())]),
+        )
+        .with_marker(
+            "Break",
+            Marker::new("Break").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_if_with(vec![TIMESHEET_TAG])
+            .with_value(TimesheetPointType::Break.as_str())]),
+        )
+        .with_marker(
+            "LunchBreak",
+            Marker::new("Break").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_if_with(vec![TIMESHEET_TAG])
+            .with_value(TimesheetPointType::Break.as_str())]),
+        )
+        .with_marker(
+            "Feierabend",
+            Marker::new("Break").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_if_with(vec![TIMESHEET_TAG])
+            .with_value(TimesheetPointType::Break.as_str())]),
+        )
+        .with_marker(
+            "Holiday",
+            Marker::new("Official Holiday").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_if_with(vec![TIMESHEET_TAG])
+            .with_value(TimesheetPointType::Holiday.as_str())]),
+        )
+        .with_marker(
+            "SickLeave",
+            Marker::new("Sick Leave").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_if_with(vec![TIMESHEET_TAG])
+            .with_value(TimesheetPointType::SickLeave.as_str())]),
+        )
+        .with_marker(
+            "UndertimeDay",
+            Marker::new("Undertime Leave").with_placements(vec![MarkerPlacement::new(
+                TIMESHEET_DIMENSION_NAME,
+            )
+            .with_if_with(vec![TIMESHEET_TAG])
+            .with_value(TimesheetPointType::Undertime.as_str())]),
+        )
+});
diff --git a/src/timesheet/extract.rs b/src/timesheet/extract.rs
new file mode 100644
index 0000000..e11131e
--- /dev/null
+++ b/src/timesheet/extract.rs
@@ -0,0 +1,537 @@
+use chrono::{DateTime, Utc};
+use itertools::Itertools;
+
+use crate::error::StreamdError;
+use crate::models::{LocalizedShard, SpecialDayType, Timecard, Timesheet};
+use crate::query::find_shard_by_set_dimension;
+
+use super::configuration::TIMESHEET_DIMENSION_NAME;
+use super::TimesheetPointType;
+
+/// A point in time with an associated timesheet type.
+#[derive(Debug, Clone)]
+struct TimesheetPoint {
+    moment: DateTime<Utc>,
+    point_type: TimesheetPointType,
+}
+
+/// Convert a localized shard to a timesheet point.
+fn shard_to_timesheet_point(shard: &LocalizedShard) -> Option<TimesheetPoint> {
+    let type_str = shard.location.get(TIMESHEET_DIMENSION_NAME)?;
+    let point_type = type_str.parse::<TimesheetPointType>().ok()?;
+
+    Some(TimesheetPoint {
+        moment: shard.moment,
+        point_type,
+    })
+}
+
+/// Convert localized shards to timesheet points.
+fn shards_to_timesheet_points(shards: &[LocalizedShard]) -> Vec<TimesheetPoint> {
+    find_shard_by_set_dimension(shards, TIMESHEET_DIMENSION_NAME)
+        .iter()
+        .filter_map(shard_to_timesheet_point)
+        .collect()
+}
+
+/// Aggregate timesheet points for a single day into a Timesheet.
+fn aggregate_timecard_day(points: &[TimesheetPoint]) -> Result<Option<Timesheet>, StreamdError> {
+    if points.is_empty() {
+        return Ok(None);
+    }
+
+    let sorted_points: Vec<_> = {
+        let mut pts = points.to_vec();
+        pts.sort_by_key(|p| p.moment);
+        pts
+    };
+
+    let card_date = sorted_points[0].moment.date_naive();
+    let mut is_sick_leave = false;
+    let mut special_day_type: Option<SpecialDayType> = None;
+
+    // State machine: starting in "break" mode (not working)
+    let mut last_is_break = true;
+    let mut last_time = sorted_points[0].moment.time();
+    let mut timecards: Vec<Timecard> = Vec::new();
+
+    for point in &sorted_points {
+        if point.moment.date_naive() != card_date {
+            return Err(StreamdError::TimesheetError(
+                "Dates of all given timesheet days should be consistent".to_string(),
+            ));
+        }
+
+        let point_time = point.moment.time();
+
+        match point.point_type {
+            TimesheetPointType::Holiday => {
+                if special_day_type.is_some() {
+                    return Err(StreamdError::TimesheetError(format!(
+                        "{} is both {:?} and {:?}",
+                        card_date, point.point_type, special_day_type
+                    )));
+                }
+                special_day_type = Some(SpecialDayType::Holiday);
+            }
+            TimesheetPointType::Vacation => {
+                if special_day_type.is_some() {
+                    return Err(StreamdError::TimesheetError(format!(
+                        "{} is both {:?} and {:?}",
+                        card_date, point.point_type, special_day_type
+                    )));
+                }
+                special_day_type = Some(SpecialDayType::Vacation);
+            }
+            TimesheetPointType::Undertime => {
+                if special_day_type.is_some() {
+                    return Err(StreamdError::TimesheetError(format!(
+                        "{} is both {:?} and {:?}",
+                        card_date, point.point_type, special_day_type
+                    )));
+                }
+                special_day_type = Some(SpecialDayType::Undertime);
+            }
+            TimesheetPointType::SickLeave => {
+                is_sick_leave = true;
+            }
+            TimesheetPointType::Break => {
+                if !last_is_break {
+                    timecards.push(Timecard::new(last_time, point_time));
+                    last_is_break = true;
+                    last_time = point_time;
+                }
+            }
+            TimesheetPointType::Card => {
+                if last_is_break {
+                    last_is_break = false;
+                    last_time = point_time;
+                }
+            }
+        }
+    }
+
+    // Check that we ended in break mode
+    if !last_is_break {
+        return Err(StreamdError::TimesheetError(format!(
+            "Last Timecard of {} is not a break!",
+            card_date
+        )));
+    }
+
+    // Only return a timesheet if there's meaningful data
+    if timecards.is_empty() && !is_sick_leave && special_day_type.is_none() {
+        return Ok(None);
+    }
+
+    Ok(Some(Timesheet {
+        date: card_date,
+        is_sick_leave,
+        special_day_type,
+        timecards,
+    }))
+}
+
+/// Aggregate timesheet points into timesheets, grouped by day.
+fn aggregate_timecards(points: &[TimesheetPoint]) -> Result<Vec<Timesheet>, StreamdError> {
+    let mut timesheets = Vec::new();
+
+    // Group by date
+    for (_date, group) in &points.iter().chunk_by(|p| p.moment.date_naive()) {
+        let day_points: Vec<_> = group.cloned().collect();
+        if let Some(timesheet) = aggregate_timecard_day(&day_points)? {
+            timesheets.push(timesheet);
+        }
+    }
+
+    Ok(timesheets)
+}
+
+/// Extract timesheets from localized shards.
+pub fn extract_timesheets(shards: &[LocalizedShard]) -> Result<Vec<Timesheet>, StreamdError> {
+    let points = shards_to_timesheet_points(shards);
+    aggregate_timecards(&points)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::{NaiveTime, TimeZone};
+    use indexmap::IndexMap;
+
+    fn point(at: DateTime<Utc>, point_type: TimesheetPointType) -> LocalizedShard {
+        let mut location = IndexMap::new();
+        location.insert(
+            TIMESHEET_DIMENSION_NAME.to_string(),
+            point_type.as_str().to_string(),
+        );
+        location.insert("file".to_string(), "dummy.md".to_string());
+
+        LocalizedShard {
+            moment: at,
+            markers: vec!["Timesheet".to_string()],
+            tags: vec![],
+            start_line: 1,
+            end_line: 1,
+            children: vec![],
+            location,
+        }
+    }
+
+    #[test]
+    fn test_single_work_block() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(17, 30, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].date, day.date_naive());
+        assert!(!result[0].is_sick_leave);
+        assert!(result[0].special_day_type.is_none());
+        assert_eq!(result[0].timecards.len(), 1);
+        assert_eq!(
+            result[0].timecards[0].from_time,
+            NaiveTime::from_hms_opt(9, 0, 0).unwrap()
+        );
+        assert_eq!(
+            result[0].timecards[0].to_time,
+            NaiveTime::from_hms_opt(17, 30, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_three_work_blocks_separated_by_breaks() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(7, 15, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(12, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(12, 45, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(15, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(16, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(17, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].timecards.len(), 3);
+        assert_eq!(
+            result[0].timecards[0].from_time,
+            NaiveTime::from_hms_opt(7, 15, 0).unwrap()
+        );
+        assert_eq!(
+            result[0].timecards[0].to_time,
+            NaiveTime::from_hms_opt(12, 0, 0).unwrap()
+        );
+    }
+
+    #[test]
+    fn test_input_order_is_not_required_within_a_day() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(15, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(7, 15, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(12, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(12, 45, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(17, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(16, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].timecards.len(), 3);
+    }
+
+    #[test]
+    fn test_groups_by_day() {
+        let day1 = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let day2 = Utc.with_ymd_and_hms(2026, 2, 2, 0, 0, 0).unwrap();
+
+        let shards = vec![
+            point(
+                day1.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day1.with_time(NaiveTime::from_hms_opt(17, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+            point(
+                day2.with_time(NaiveTime::from_hms_opt(10, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day2.with_time(NaiveTime::from_hms_opt(18, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 2);
+        assert_eq!(result[0].date, day1.date_naive());
+        assert_eq!(result[1].date, day2.date_naive());
+    }
+
+    #[test]
+    fn test_day_with_only_special_day_type_vacation() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(8, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Vacation,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].special_day_type, Some(SpecialDayType::Vacation));
+        assert!(result[0].timecards.is_empty());
+    }
+
+    #[test]
+    fn test_day_with_only_special_day_type_holiday() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(8, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Holiday,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].special_day_type, Some(SpecialDayType::Holiday));
+    }
+
+    #[test]
+    fn test_day_with_only_special_day_type_undertime() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(8, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Undertime,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].special_day_type, Some(SpecialDayType::Undertime));
+    }
+
+    #[test]
+    fn test_day_with_sick_leave_and_timecards() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(7, 30, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::SickLeave,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(12, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert!(result[0].is_sick_leave);
+        assert_eq!(result[0].timecards.len(), 1);
+    }
+
+    #[test]
+    fn test_day_with_sick_leave_only() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(8, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::SickLeave,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert_eq!(result.len(), 1);
+        assert!(result[0].is_sick_leave);
+        assert!(result[0].timecards.is_empty());
+    }
+
+    #[test]
+    fn test_empty_input() {
+        let result = extract_timesheets(&[]).unwrap();
+        assert!(result.is_empty());
+    }
+
+    #[test]
+    fn test_day_with_only_cards_and_no_break_is_invalid() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(12, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Card,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards);
+
+        assert!(result.is_err());
+        let err = result.unwrap_err();
+        assert!(err.to_string().contains("not a break"));
+    }
+
+    #[test]
+    fn test_two_special_day_types_same_day_is_invalid() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(8, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Vacation,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(8, 5, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Holiday,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(9, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards);
+
+        assert!(result.is_err());
+        let err = result.unwrap_err();
+        assert!(err.to_string().contains("is both"));
+    }
+
+    #[test]
+    fn test_day_with_only_breaks_is_ignored() {
+        let day = Utc.with_ymd_and_hms(2026, 2, 1, 0, 0, 0).unwrap();
+        let shards = vec![
+            point(
+                day.with_time(NaiveTime::from_hms_opt(12, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+            point(
+                day.with_time(NaiveTime::from_hms_opt(13, 0, 0).unwrap())
+                    .unwrap(),
+                TimesheetPointType::Break,
+            ),
+        ];
+
+        let result = extract_timesheets(&shards).unwrap();
+
+        assert!(result.is_empty());
+    }
+}
diff --git a/src/timesheet/mod.rs b/src/timesheet/mod.rs
new file mode 100644
index 0000000..85bbab2
--- /dev/null
+++ b/src/timesheet/mod.rs
@@ -0,0 +1,7 @@
+mod configuration;
+mod extract;
+mod point_types;
+
+pub use configuration::{BasicTimesheetConfiguration, TIMESHEET_DIMENSION_NAME, TIMESHEET_TAG};
+pub use extract::extract_timesheets;
+pub use point_types::TimesheetPointType;
diff --git a/src/timesheet/point_types.rs b/src/timesheet/point_types.rs
new file mode 100644
index 0000000..29d3ece
--- /dev/null
+++ b/src/timesheet/point_types.rs
@@ -0,0 +1,54 @@
+use serde::{Deserialize, Serialize};
+use std::str::FromStr;
+
+/// Type of timesheet point for time tracking.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum TimesheetPointType {
+    #[serde(rename = "CARD")]
+    Card,
+    #[serde(rename = "SICK_LEAVE")]
+    SickLeave,
+    #[serde(rename = "VACATION")]
+    Vacation,
+    #[serde(rename = "UNDERTIME")]
+    Undertime,
+    #[serde(rename = "HOLIDAY")]
+    Holiday,
+    #[serde(rename = "BREAK")]
+    Break,
+}
+
+impl TimesheetPointType {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            TimesheetPointType::Card => "CARD",
+            TimesheetPointType::SickLeave => "SICK_LEAVE",
+            TimesheetPointType::Vacation => "VACATION",
+            TimesheetPointType::Undertime => "UNDERTIME",
+            TimesheetPointType::Holiday => "HOLIDAY",
+            TimesheetPointType::Break => "BREAK",
+        }
+    }
+}
+
+impl std::fmt::Display for TimesheetPointType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.as_str())
+    }
+}
+
+impl FromStr for TimesheetPointType {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "CARD" => Ok(TimesheetPointType::Card),
+            "SICK_LEAVE" => Ok(TimesheetPointType::SickLeave),
+            "VACATION" => Ok(TimesheetPointType::Vacation),
+            "UNDERTIME" => Ok(TimesheetPointType::Undertime),
+            "HOLIDAY" => Ok(TimesheetPointType::Holiday),
+            "BREAK" => Ok(TimesheetPointType::Break),
+            _ => Err(format!("Unknown timesheet point type: {}", s)),
+        }
+    }
+}
diff --git a/tests/localize/test_extract_datetime.py b/tests/localize/test_extract_datetime.py
deleted file mode 100644
index 8758ebf..0000000
--- a/tests/localize/test_extract_datetime.py
+++ /dev/null
@@ -1,157 +0,0 @@
-from datetime import date, datetime, time
-
-from streamd.localize.extract_datetime import (
-    extract_date_from_marker,
-    extract_datetime_from_file_name,
-    extract_datetime_from_marker,
-    extract_datetime_from_marker_list,
-    extract_time_from_marker,
-)
-
-
-class TestExtractDateTime:
-    def test_extract_date_from_file_name_valid(self):
-        file_name = "20230101-123456 Some Text.md"
-        assert datetime(2023, 1, 1, 12, 34, 56) == extract_datetime_from_file_name(
-            file_name
-        )
-
-    def test_extract_date_from_file_name_invalid(self):
-        file_name = "invalid-file-name.md"
-        assert extract_datetime_from_file_name(file_name) is None
-
-    def test_extract_date_from_file_name_without_time(self):
-        file_name = "20230101 Some Text.md"
-        assert datetime(2023, 1, 1, 0, 0, 0) == extract_datetime_from_file_name(
-            file_name
-        )
-
-    def test_extract_date_from_file_name_short_time(self):
-        file_name = "20230101-1234 Some Text.md"
-        assert datetime(2023, 1, 1, 12, 34, 0) == extract_datetime_from_file_name(
-            file_name
-        )
-
-    def test_extract_date_from_file_name_empty_string(self):
-        file_name = ""
-        assert extract_datetime_from_file_name(file_name) is None
-
-    def test_extract_date_from_file_name_with_full_path(self):
-        file_name = "/path/to/20230101-123456 Some Text.md"
-        assert datetime(2023, 1, 1, 12, 34, 56) == extract_datetime_from_file_name(
-            file_name
-        )
-
-
-class TestExtractMarkerDateTime:
-    def test_extract_datetime_from_marker_valid(self):
-        marker = "20250101150000"
-        assert datetime(2025, 1, 1, 15, 0, 0) == extract_datetime_from_marker(marker)
-
-    def test_extract_datetime_from_marker_invalid_format(self):
-        assert extract_datetime_from_marker("2025010115000") is None  # too short
-        assert extract_datetime_from_marker("202501011500000") is None  # too long
-        assert extract_datetime_from_marker("2025-01-01T150000") is None  # separators
-        assert extract_datetime_from_marker("2025010115000a") is None  # non-digit
-        assert extract_datetime_from_marker("") is None
-
-    def test_extract_datetime_from_marker_invalid_values(self):
-        assert extract_datetime_from_marker("20250230120000") is None  # Feb 30
-        assert extract_datetime_from_marker("20250101126000") is None  # minute 60
-        assert extract_datetime_from_marker("20250101240000") is None  # hour 24
-
-
-class TestExtractMarkerDate:
-    def test_extract_date_from_marker_valid(self):
-        marker = "20250101"
-        assert date(2025, 1, 1) == extract_date_from_marker(marker)
-
-    def test_extract_date_from_marker_invalid_format(self):
-        assert extract_date_from_marker("2025010") is None  # too short
-        assert extract_date_from_marker("202501011") is None  # too long
-        assert extract_date_from_marker("2025-01-01") is None  # separators
-        assert extract_date_from_marker("2025010a") is None  # non-digit
-        assert extract_date_from_marker("") is None
-
-    def test_extract_date_from_marker_invalid_values(self):
-        assert extract_date_from_marker("20250230") is None  # Feb 30
-        assert extract_date_from_marker("20251301") is None  # month 13
-        assert extract_date_from_marker("20250132") is None  # day 32
-
-
-class TestExtractMarkerTime:
-    def test_extract_time_from_marker_valid(self):
-        marker = "150000"
-        assert time(15, 0, 0) == extract_time_from_marker(marker)
-
-    def test_extract_time_from_marker_invalid_format(self):
-        assert extract_time_from_marker("15000") is None  # too short
-        assert extract_time_from_marker("1500000") is None  # too long
-        assert extract_time_from_marker("15:00:00") is None  # separators
-        assert extract_time_from_marker("15000a") is None  # non-digit
-        assert extract_time_from_marker("") is None
-
-    def test_extract_time_from_marker_invalid_values(self):
-        assert extract_time_from_marker("240000") is None  # hour 24
-        assert extract_time_from_marker("156000") is None  # minute 60
-        assert extract_time_from_marker("150060") is None  # second 60
-
-
-class TestExtractDateTimeFromMarkerList:
-    def test_no_markers_inherits_datetime(self):
-        inherited = datetime(2025, 1, 2, 3, 4, 5)
-        assert inherited == extract_datetime_from_marker_list([], inherited)
-
-    def test_unrelated_markers_inherits_datetime(self):
-        inherited = datetime(2025, 1, 2, 3, 4, 5)
-        markers = ["not-a-marker", "2025-01-01", "1500", "1234567"]
-        assert inherited == extract_datetime_from_marker_list(markers, inherited)
-
-    def test_date_only_marker_sets_midnight(self):
-        inherited = datetime(2025, 6, 7, 8, 9, 10)
-        markers = ["20250101"]
-        assert datetime(2025, 1, 1, 0, 0, 0) == extract_datetime_from_marker_list(
-            markers, inherited
-        )
-
-    def test_time_only_marker_inherits_date(self):
-        inherited = datetime(2025, 6, 7, 8, 9, 10)
-        markers = ["150000"]
-        assert datetime(2025, 6, 7, 15, 0, 0) == extract_datetime_from_marker_list(
-            markers, inherited
-        )
-
-    def test_datetime_marker_overrides_both_date_and_time(self):
-        inherited = datetime(2025, 6, 7, 8, 9, 10)
-        markers = ["20250101150000"]
-        assert datetime(2025, 1, 1, 15, 0, 0) == extract_datetime_from_marker_list(
-            markers, inherited
-        )
-
-    def test_combined_date_and_time_markers(self):
-        inherited = datetime(2025, 6, 7, 8, 9, 10)
-        markers = ["20250101", "150000"]
-        assert datetime(2025, 1, 1, 15, 0, 0) == extract_datetime_from_marker_list(
-            markers, inherited
-        )
-
-    def test_first_marker_wins_when_multiple_dates_or_times(self):
-        inherited = datetime(2025, 6, 7, 8, 9, 10)
-        markers = ["20250101", "150000", "20250102", "160000"]
-        assert datetime(2025, 1, 1, 15, 0, 0) == extract_datetime_from_marker_list(
-            markers, inherited
-        )
-
-    def test_last_separated_date_and_time_win(self):
-        inherited = datetime(2025, 6, 7, 8, 9, 10)
-        markers = ["20250101", "150000", "20250102160000"]
-        assert datetime(2025, 1, 1, 15, 0, 0) == extract_datetime_from_marker_list(
-            markers, inherited
-        )
-
-    def test_invalid_date_or_time_markers_are_ignored(self):
-        inherited = datetime(2025, 6, 7, 8, 9, 10)
-        markers = ["20251301", "240000", "20250101", "150000"]
-        assert datetime(2025, 1, 1, 15, 0, 0) == extract_datetime_from_marker_list(
-            markers, inherited
-        )
diff --git a/tests/localize/test_repository_configuration_merge.py b/tests/localize/test_repository_configuration_merge.py
deleted file mode 100644
index ba74c76..0000000
--- a/tests/localize/test_repository_configuration_merge.py
+++ /dev/null
@@ -1,367 +0,0 @@
-import pytest
-
-from streamd.localize.repository_configuration import (
-    Dimension,
-    Marker,
-    MarkerPlacement,
-    RepositoryConfiguration,
-    merge_dimensions,
-    merge_markers,
-    merge_repository_configuration,
-    merge_single_dimension,
-    merge_single_marker,
-)
-
-
-class TestMergeSingleDimension:
-    def test_second_overrides_display_name_when_non_empty(self):
-        base = Dimension(display_name="Base", comment="c1", propagate=True)
-        second = Dimension(display_name="Second", comment="c2", propagate=False)
-
-        merged = merge_single_dimension(base, second)
-
-        assert merged.display_name == "Second"
-        assert merged.comment == "c2"
-        assert merged.propagate is False
-
-    def test_second_empty_display_name_falls_back_to_base(self):
-        base = Dimension(display_name="Base", comment="c1", propagate=True)
-        second = Dimension(display_name="", comment="c2", propagate=False)
-
-        merged = merge_single_dimension(base, second)
-
-        assert merged.display_name == "Base"
-        assert merged.comment == "c2"
-        assert merged.propagate is False
-
-    def test_second_comment_none_does_not_erase_base_comment(self):
-        base = Dimension(display_name="Base", comment="keep", propagate=True)
-        second = Dimension(display_name="Second", comment=None, propagate=False)
-
-        merged = merge_single_dimension(base, second)
-
-        assert merged.display_name == "Second"
-        assert merged.comment == "keep"
-
-    def test_second_comment_non_none_overrides_base_comment(self):
-        base = Dimension(display_name="Base", comment="c1", propagate=True)
-        second = Dimension(display_name="Second", comment="c2", propagate=True)
-
-        merged = merge_single_dimension(base, second)
-
-        assert merged.comment == "c2"
-
-    def test_second_propagate_overrides_base_when_provided(self):
-        base = Dimension(display_name="Base", comment="c1", propagate=True)
-        second = Dimension(display_name="Second", comment="c2", propagate=False)
-
-        merged = merge_single_dimension(base, second)
-
-        assert merged.propagate is False
-
-    def test_propagate_merging_retains_base_when_second_not_provided(self):
-        base = Dimension(display_name="Base", comment="c1", propagate=True)
-        second = Dimension(display_name="Second", comment="c2")
-
-        merged = merge_single_dimension(base, second)
-
-        assert merged.propagate is True
-
-
-class TestMergeDimensions:
-    def test_adds_new_keys_from_second(self):
-        base = {"a": Dimension(display_name="A", propagate=True)}
-        second = {"b": Dimension(display_name="B", propagate=False)}
-
-        merged = merge_dimensions(base, second)
-
-        assert set(merged.keys()) == {"a", "b"}
-        assert merged["a"].display_name == "A"
-        assert merged["b"].display_name == "B"
-
-    def test_merges_existing_keys(self):
-        base = {"a": Dimension(display_name="A", comment="c1", propagate=True)}
-        second = {"a": Dimension(display_name="A2", comment=None, propagate=False)}
-
-        merged = merge_dimensions(base, second)
-
-        assert merged["a"].display_name == "A2"
-        assert merged["a"].comment == "c1"
-        assert merged["a"].propagate is False
-
-    def test_does_not_mutate_inputs(self):
-        base = {"a": Dimension(display_name="A", comment="c1", propagate=True)}
-        second = {"b": Dimension(display_name="B", comment="c2", propagate=False)}
-
-        merged = merge_dimensions(base, second)
-
-        assert "b" not in base
-        assert "a" not in second
-        assert set(merged.keys()) == {"a", "b"}
-
-
-class TestMergeSingleMarker:
-    def test_second_overrides_display_name_when_non_empty(self):
-        base = Marker(
-            display_name="Base",
-            placements=[MarkerPlacement(dimension="project", value=None)],
-        )
-        second = Marker(
-            display_name="Second",
-            placements=[MarkerPlacement(dimension="timesheet", value="coding")],
-        )
-
-        merged = merge_single_marker(base, second)
-
-        assert merged.display_name == "Second"
-        assert merged.placements == [
-            MarkerPlacement(dimension="project", value=None, if_with=set()),
-            MarkerPlacement(dimension="timesheet", value="coding", if_with=set()),
-        ]
-
-    def test_second_empty_display_name_falls_back_to_base(self):
-        base = Marker(display_name="Base", placements=[])
-        second = Marker(display_name="", placements=[])
-
-        merged = merge_single_marker(base, second)
-
-        assert merged.display_name == "Base"
-
-    def test_appends_new_placements(self):
-        base = Marker(
-            display_name="Base",
-            placements=[
-                MarkerPlacement(dimension="project"),
-            ],
-        )
-        second = Marker(
-            display_name="Second",
-            placements=[
-                MarkerPlacement(
-                    if_with={"Timesheet"}, dimension="timesheet", value="x"
-                ),
-            ],
-        )
-
-        merged = merge_single_marker(base, second)
-
-        assert merged.placements == [
-            MarkerPlacement(dimension="project"),
-            MarkerPlacement(if_with={"Timesheet"}, dimension="timesheet", value="x"),
-        ]
-
-    def test_deduplicates_by_identity_and_second_overrides_base(self):
-        base = Marker(
-            display_name="Base",
-            placements=[
-                MarkerPlacement(if_with={"A"}, dimension="d", value="v"),
-                MarkerPlacement(if_with={"B"}, dimension="d", value="v2"),
-            ],
-        )
-        second = Marker(
-            display_name="Second",
-            placements=[
-                MarkerPlacement(if_with={"A"}, dimension="d", value="v"),
-                MarkerPlacement(if_with={"C"}, dimension="d", value="v3"),
-            ],
-        )
-
-        merged = merge_single_marker(base, second)
-
-        assert merged.placements == [
-            MarkerPlacement(if_with={"A"}, dimension="d", value="v"),
-            MarkerPlacement(if_with={"B"}, dimension="d", value="v2"),
-            MarkerPlacement(if_with={"C"}, dimension="d", value="v3"),
-        ]
-
-    def test_identity_is_order_insensitive_for_if_with(self):
-        base = Marker(
-            display_name="Base",
-            placements=[MarkerPlacement(if_with={"A", "B"}, dimension="d", value="v")],
-        )
-        second = Marker(
-            display_name="Second",
-            placements=[MarkerPlacement(if_with={"B", "A"}, dimension="d", value="v2")],
-        )
-
-        merged = merge_single_marker(base, second)
-
-        # With `if_with` as a set, identity is order-insensitive; second overrides base.
-        assert merged.placements == [
-            MarkerPlacement(if_with={"A", "B"}, dimension="d", value="v2"),
-        ]
-
-
-class TestMergeMarkers:
-    def test_adds_new_marker_keys_from_second(self):
-        base = {"M1": Marker(display_name="M1", placements=[])}
-        second = {"M2": Marker(display_name="M2", placements=[])}
-
-        merged = merge_markers(base, second)
-
-        assert set(merged.keys()) == {"M1", "M2"}
-
-    def test_merges_existing_marker_keys(self):
-        base = {
-            "M": Marker(
-                display_name="Base",
-                placements=[MarkerPlacement(dimension="project")],
-            )
-        }
-        second = {
-            "M": Marker(
-                display_name="Second",
-                placements=[
-                    MarkerPlacement(
-                        if_with={"Timesheet"}, dimension="timesheet", value="coding"
-                    )
-                ],
-            )
-        }
-
-        merged = merge_markers(base, second)
-
-        assert merged["M"].display_name == "Second"
-        assert merged["M"].placements == [
-            MarkerPlacement(dimension="project", value=None, if_with=set()),
-            MarkerPlacement(
-                if_with={"Timesheet"}, dimension="timesheet", value="coding"
-            ),
-        ]
-
-    def test_does_not_mutate_inputs(self):
-        base = {"M1": Marker(display_name="M1", placements=[])}
-        second = {"M2": Marker(display_name="M2", placements=[])}
-
-        merged = merge_markers(base, second)
-
-        assert "M2" not in base
-        assert "M1" not in second
-        assert set(merged.keys()) == {"M1", "M2"}
-
-
-class TestMergeRepositoryConfiguration:
-    def test_merges_dimensions_and_markers(self):
-        base = RepositoryConfiguration(
-            dimensions={
-                "project": Dimension(
-                    display_name="Project", comment="c1", propagate=True
-                ),
-                "moment": Dimension(
-                    display_name="Moment", comment="c2", propagate=True
-                ),
-            },
-            markers={
-                "Streamd": Marker(
-                    display_name="Streamd",
-                    placements=[MarkerPlacement(dimension="project")],
-                )
-            },
-        )
-
-        second = RepositoryConfiguration(
-            dimensions={
-                "project": Dimension(display_name="Project2", propagate=False),
-                "timesheet": Dimension(
-                    display_name="Timesheet", comment="c3", propagate=False
-                ),
-            },
-            markers={
-                "Streamd": Marker(
-                    display_name="Streamd2",
-                    placements=[
-                        MarkerPlacement(
-                            if_with={"Timesheet"}, dimension="timesheet", value="coding"
-                        )
-                    ],
-                ),
-                "JobHunting": Marker(
-                    display_name="JobHunting",
-                    placements=[MarkerPlacement(dimension="project")],
-                ),
-            },
-        )
-
-        merged = merge_repository_configuration(base, second)
-
-        assert set(merged.dimensions.keys()) == {"project", "moment", "timesheet"}
-        assert merged.dimensions["project"].display_name == "Project2"
-        assert merged.dimensions["project"].comment == "c1"
-        assert merged.dimensions["project"].propagate is False
-        assert merged.dimensions["moment"].display_name == "Moment"
-        assert merged.dimensions["timesheet"].display_name == "Timesheet"
-
-        assert set(merged.markers.keys()) == {"Streamd", "JobHunting"}
-        assert merged.markers["Streamd"].display_name == "Streamd2"
-        assert merged.markers["Streamd"].placements == [
-            MarkerPlacement(dimension="project", value=None, if_with=set()),
-            MarkerPlacement(
-                if_with={"Timesheet"}, dimension="timesheet", value="coding"
-            ),
-        ]
-        assert merged.markers["JobHunting"].placements == [
-            MarkerPlacement(dimension="project", value=None, if_with=set())
-        ]
-
-    def test_does_not_mutate_base_or_second(self):
-        base = RepositoryConfiguration(
-            dimensions={"a": Dimension(display_name="A", propagate=True)},
-            markers={"M": Marker(display_name="M", placements=[])},
-        )
-        second = RepositoryConfiguration(
-            dimensions={"b": Dimension(display_name="B", propagate=False)},
-            markers={"N": Marker(display_name="N", placements=[])},
-        )
-
-        _ = merge_repository_configuration(base, second)
-
-        assert set(base.dimensions.keys()) == {"a"}
-        assert set(second.dimensions.keys()) == {"b"}
-        assert set(base.markers.keys()) == {"M"}
-        assert set(second.markers.keys()) == {"N"}
-
-    def test_merge_is_associative_for_non_conflicting_inputs(self):
-        a = RepositoryConfiguration(
-            dimensions={"d1": Dimension(display_name="D1", propagate=True)},
-            markers={"m1": Marker(display_name="M1", placements=[])},
-        )
-        b = RepositoryConfiguration(
-            dimensions={"d2": Dimension(display_name="D2", propagate=False)},
-            markers={"m2": Marker(display_name="M2", placements=[])},
-        )
-        c = RepositoryConfiguration(
-            dimensions={"d3": Dimension(display_name="D3", propagate=False)},
-            markers={"m3": Marker(display_name="M3", placements=[])},
-        )
-
-        left = merge_repository_configuration(merge_repository_configuration(a, b), c)
-        right = merge_repository_configuration(a, merge_repository_configuration(b, c))
-
-        assert left == right
-        assert set(left.dimensions.keys()) == {"d1", "d2", "d3"}
-        assert set(left.markers.keys()) == {"m1", "m2", "m3"}
-
-
-@pytest.mark.parametrize(
-    ("base", "second", "expected_propagate"),
-    [
-        (
-            RepositoryConfiguration(
-                dimensions={"d": Dimension(display_name="D", propagate=True)},
-                markers={},
-            ),
-            RepositoryConfiguration(
-                dimensions={"d": Dimension(display_name="D2")},
-                markers={},
-            ),
-            True,
-        )
-    ],
-)
-def test_merge_repository_configuration_propagate_preserves_base_when_omitted(
-    base: RepositoryConfiguration,
-    second: RepositoryConfiguration,
-    expected_propagate: bool,
-):
-    merged = merge_repository_configuration(base, second)
-    assert merged.dimensions["d"].propagate is expected_propagate
diff --git a/tests/parse/test_parse.py b/tests/parse/test_parse.py
deleted file mode 100644
index ef72e5a..0000000
--- a/tests/parse/test_parse.py
+++ /dev/null
@@ -1,343 +0,0 @@
-from faker import Faker
-from streamd.parse import Shard, StreamFile, parse_markdown_file
-
-fake = Faker()
-
-
-class TestParseProcess:
-    file_name: str = fake.file_name(extension="md")
-
-    def test_parse_empty_file(self):
-        assert parse_markdown_file(self.file_name, "") == StreamFile(
-            file_name=self.file_name, shard=Shard(start_line=1, end_line=1)
-        )
-
-    def test_parse_basic_one_line_file(self):
-        test_file = "Hello World"
-        assert parse_markdown_file(self.file_name, test_file) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                start_line=1,
-                end_line=1,
-            ),
-        )
-
-    def test_parse_basic_multi_line_file(self):
-        test_file = "Hello World\n\nHello again!"
-        assert parse_markdown_file(self.file_name, test_file) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                start_line=1,
-                end_line=3,
-            ),
-        )
-
-    def test_parse_single_line_with_tag(self):
-        test_file = "@Tag Hello World"
-        assert parse_markdown_file(self.file_name, test_file) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                markers=["Tag"],
-                start_line=1,
-                end_line=1,
-            ),
-        )
-
-    def test_parse_single_line_with_two_tags(self):
-        test_file = "@Marker1 @Marker2 Hello World"
-        assert parse_markdown_file(self.file_name, test_file) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                markers=["Marker1", "Marker2"],
-                start_line=1,
-                end_line=1,
-            ),
-        )
-
-    def test_parse_single_line_with_two_tags_and_misplaced_tag(self):
-        test_file = "@Tag1 @Tag2 Hello World @Tag3"
-        assert parse_markdown_file(self.file_name, test_file) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                markers=["Tag1", "Tag2"],
-                tags=["Tag3"],
-                start_line=1,
-                end_line=1,
-            ),
-        )
-
-    def test_parse_split_paragraphs_into_shards(self):
-        file_text = "Hello World!\n\n@Tag1 Block 1\n\n@Tag2 Block 2"
-
-        assert parse_markdown_file(self.file_name, file_text) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                start_line=1,
-                end_line=5,
-                children=[
-                    Shard(
-                        markers=["Tag1"],
-                        start_line=3,
-                        end_line=3,
-                    ),
-                    Shard(
-                        markers=["Tag2"],
-                        start_line=5,
-                        end_line=5,
-                    ),
-                ],
-            ),
-        )
-
-    def test_parse_split_paragraph_with_inner_tags_at_more_positions(self):
-        file_text = "Hello @Tag1 World!\n\n@Marker Block 1\n\nBlock 2 @Tag2"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            tags=["Tag1", "Tag2"],
-            start_line=1,
-            end_line=5,
-            children=[
-                Shard(markers=["Marker"], start_line=3, end_line=3, children=[]),
-            ],
-        )
-
-    def test_parse_header_without_markers(self):
-        file_text = "# Heading\n\n## Subheading"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            start_line=1,
-            end_line=3,
-        )
-
-    def test_parse_split_at_heading_if_marker_on_subheading(self):
-        file_text = "# Heading @Tag1\n\n## @Marker1 Subheading @Tag2\n\n# Heading @Tag3"
-
-        assert parse_markdown_file(self.file_name, file_text) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                start_line=1,
-                end_line=5,
-                children=[
-                    Shard(
-                        tags=["Tag1"],
-                        start_line=1,
-                        end_line=4,
-                        children=[
-                            Shard(
-                                markers=["Marker1"],
-                                tags=["Tag2"],
-                                start_line=3,
-                                end_line=4,
-                            ),
-                        ],
-                    ),
-                    Shard(tags=["Tag3"], start_line=5, end_line=5, children=[]),
-                ],
-            ),
-        )
-
-    def test_parse_only_parse_releveant_levels(self):
-        file_text = "# @Marker1 Heading @Tag1\n\n## Subheading @Tag2"
-
-        assert parse_markdown_file(self.file_name, file_text) == StreamFile(
-            file_name=self.file_name,
-            shard=Shard(
-                markers=["Marker1"],
-                tags=["Tag1", "Tag2"],
-                start_line=1,
-                end_line=3,
-            ),
-        )
-
-    def test_parse_fullly_before_headings_start(self):
-        file_text = "Hello\n\n@Marker1 World!\n\n# @Marker2 I'm a heading!"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            start_line=1,
-            end_line=5,
-            children=[
-                Shard(
-                    start_line=1,
-                    end_line=4,
-                    children=[
-                        Shard(
-                            markers=["Marker1"],
-                            start_line=3,
-                            end_line=3,
-                        )
-                    ],
-                ),
-                Shard(markers=["Marker2"], start_line=5, end_line=5, children=[]),
-            ],
-        )
-
-    def test_parse_complex_heading_structure(self):
-        file_text = "Preamble @Preamble\n## @Intro\n# @Title\n## @Chapter1\n## @Chapter2\n### Section 1\n### Section 2"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            start_line=1,
-            end_line=7,
-            children=[
-                Shard(
-                    start_line=1,
-                    end_line=2,
-                    children=[
-                        Shard(
-                            tags=["Preamble"],
-                            start_line=1,
-                            end_line=1,
-                        ),
-                        Shard(
-                            markers=["Intro"],
-                            start_line=2,
-                            end_line=2,
-                        ),
-                    ],
-                ),
-                Shard(
-                    markers=["Title"],
-                    start_line=3,
-                    end_line=7,
-                    children=[
-                        Shard(
-                            markers=["Chapter1"],
-                            start_line=4,
-                            end_line=4,
-                        ),
-                        Shard(
-                            markers=["Chapter2"],
-                            start_line=5,
-                            end_line=7,
-                        ),
-                    ],
-                ),
-            ],
-        )
-
-    def test_simple_list(self):
-        file_text = "* hello world\n  * @Marker i've got a marker"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=[],
-            tags=[],
-            start_line=1,
-            end_line=2,
-            children=[
-                Shard(
-                    markers=["Marker"], tags=[], start_line=2, end_line=2, children=[]
-                )
-            ],
-        )
-
-    def test_parse_complex_list(self):
-        file_text = """* I'm the parent!
-    * @Marker1 I've got a marker\n
-    * I've got no marker!
-    * I've got a child with a marker!
-        * @Marker2 I'm the child with the marker
-"""
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=[],
-            tags=[],
-            start_line=1,
-            end_line=6,
-            children=[
-                Shard(
-                    markers=[],
-                    tags=[],
-                    start_line=2,
-                    end_line=6,
-                    children=[
-                        Shard(
-                            markers=["Marker1"],
-                            tags=[],
-                            start_line=2,
-                            end_line=3,
-                            children=[],
-                        ),
-                        Shard(
-                            markers=[],
-                            tags=[],
-                            start_line=5,
-                            end_line=6,
-                            children=[
-                                Shard(
-                                    markers=["Marker2"],
-                                    tags=[],
-                                    start_line=6,
-                                    end_line=6,
-                                    children=[],
-                                )
-                            ],
-                        ),
-                    ],
-                )
-            ],
-        )
-
-    def test_parse_ignores_tags_in_code(self):
-        file_text = "```\n@Marker\n```"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=[],
-            tags=[],
-            start_line=1,
-            end_line=3,
-            children=[],
-        )
-
-    def test_parse_finds_tags_in_italic_text(self):
-        file_text = "*@ItalicMarker*"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=["ItalicMarker"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-        )
-
-    def test_parse_finds_tags_in_bold_text(self):
-        file_text = "**@BoldMarker**"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=["BoldMarker"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-        )
-
-    def test_parse_finds_tags_in_strikethrough_text(self):
-        file_text = "~~@StrikeMarker~~"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=["StrikeMarker"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-        )
-
-    def test_parse_finds_tags_in_link(self):
-        file_text = "[@LinkMarker](https://konstantinfickel.de)"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=["LinkMarker"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-        )
-
-    def test_parse_continues_looking_for_markers_after_first_link_marker(self):
-        file_text = "[@LinkMarker1](https://konstantinfickel.de1) [@LinkMarker2](https://konstantinfickel.de)"
-
-        assert parse_markdown_file(self.file_name, file_text).shard == Shard(
-            markers=["LinkMarker1", "LinkMarker2"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-        )
diff --git a/tests/query/test_find.py b/tests/query/test_find.py
deleted file mode 100644
index 6b72e87..0000000
--- a/tests/query/test_find.py
+++ /dev/null
@@ -1,104 +0,0 @@
-from __future__ import annotations
-
-from datetime import datetime
-
-from streamd.localize import LocalizedShard
-from streamd.query.find import find_shard, find_shard_by_position
-
-
-def generate_localized_shard(
-    *,
-    location: dict[str, str] | None = None,
-    children: list[LocalizedShard] | None = None,
-) -> LocalizedShard:
-    return LocalizedShard(
-        start_line=1,
-        end_line=1,
-        moment=datetime(2020, 1, 1),
-        location=location or {},
-        children=children or [],
-        markers=[],
-        tags=[],
-    )
-
-
-class TestFindShard:
-    def test_returns_empty_when_no_match(self) -> None:
-        root = generate_localized_shard(location={"file": "a.md"})
-        shards = [root]
-
-        result = find_shard(shards, lambda s: "missing" in s.location)
-
-        assert result == []
-
-    def test_finds_matches_depth_first_and_preserves_order(self) -> None:
-        grandchild = generate_localized_shard(location={"k": "match"})
-        child1 = generate_localized_shard(
-            location={"k": "match"}, children=[grandchild]
-        )
-        child2 = generate_localized_shard(location={"k": "nope"})
-        root = generate_localized_shard(
-            location={"k": "nope"}, children=[child1, child2]
-        )
-
-        result = find_shard([root], lambda s: s.location.get("k") == "match")
-
-        assert result == [child1, grandchild]
-
-    def test_includes_root_if_it_matches(self) -> None:
-        root = generate_localized_shard(
-            location={"k": "match"},
-            children=[generate_localized_shard(location={"k": "match"})],
-        )
-
-        result = find_shard([root], lambda s: s.location.get("k") == "match")
-
-        assert result[0] is root
-        assert len(result) == 2
-
-    def test_multiple_roots_keeps_left_to_right_order(self) -> None:
-        a = generate_localized_shard(location={"k": "match"})
-        b = generate_localized_shard(location={"k": "match"})
-        c = generate_localized_shard(location={"k": "nope"})
-
-        result = find_shard([a, b, c], lambda s: s.location.get("k") == "match")
-
-        assert result == [a, b]
-
-    def test_query_function_can_use_arbitrary_logic(self) -> None:
-        # Ensures typing/behavior supports any callable that returns bool.
-        a = generate_localized_shard(location={"x": "1"})
-        b = generate_localized_shard(location={"x": "2"})
-        c = generate_localized_shard(location={"x": "3"})
-        root = generate_localized_shard(location={}, children=[a, b, c])
-
-        def is_even_x(shard: LocalizedShard) -> bool:
-            x = shard.location.get("x")
-            return x is not None and int(x) % 2 == 0
-
-        result = find_shard([root], is_even_x)
-
-        assert result == [b]
-
-
-class TestFindShardByPosition:
-    def test_matches_only_when_dimension_present_and_equal(self) -> None:
-        match = generate_localized_shard(location={"file": "a.md", "line": "10"})
-        wrong_value = generate_localized_shard(location={"file": "a.md", "line": "11"})
-        missing_dim = generate_localized_shard(location={"file": "a.md"})
-        root = generate_localized_shard(
-            location={"root": "x"}, children=[match, wrong_value, missing_dim]
-        )
-
-        result = find_shard_by_position([root], "line", "10")
-
-        assert result == [match]
-
-    def test_recurses_through_children(self) -> None:
-        deep = generate_localized_shard(location={"section": "s1"})
-        mid = generate_localized_shard(location={"section": "s0"}, children=[deep])
-        root = generate_localized_shard(location={}, children=[mid])
-
-        result = find_shard_by_position([root], "section", "s1")
-
-        assert result == [deep]
diff --git a/tests/test_localize.py b/tests/test_localize.py
deleted file mode 100644
index ecdb864..0000000
--- a/tests/test_localize.py
+++ /dev/null
@@ -1,231 +0,0 @@
-from datetime import datetime
-
-from streamd.localize.localize import localize_stream_file
-from streamd.localize.localized_shard import LocalizedShard
-from streamd.localize.repository_configuration import (
-    Dimension,
-    Marker,
-    MarkerPlacement,
-    RepositoryConfiguration,
-)
-from streamd.parse.shard import Shard, StreamFile
-
-repository_configuration = RepositoryConfiguration(
-    dimensions={
-        "project": Dimension(
-            display_name="Project",
-            comment="GTD Project that is being worked on",
-            propagate=True,
-        ),
-        "moment": Dimension(
-            display_name="Moment",
-            comment="Timestamp this entry was created at",
-            propagate=True,
-        ),
-        "timesheet": Dimension(
-            display_name="Timesheet",
-            comment="Time Cards for Time Tracking",
-            propagate=True,
-        ),
-    },
-    markers={
-        "Streamd": Marker(
-            display_name="Streamd",
-            placements=[
-                MarkerPlacement(dimension="project"),
-                MarkerPlacement(
-                    if_with={"Timesheet"}, dimension="timesheet", value="coding"
-                ),
-            ],
-        ),
-        "JobHunting": Marker(
-            display_name="JobHunting", placements=[MarkerPlacement(dimension="project")]
-        ),
-    },
-)
-
-
-class TestLocalize:
-    def test_project_simple_stream_file(self):
-        stream_file = StreamFile(
-            file_name="20250622-121000 Test File.md",
-            shard=Shard(start_line=1, end_line=1, markers=["Streamd"]),
-        )
-
-        assert localize_stream_file(
-            stream_file, repository_configuration
-        ) == LocalizedShard(
-            moment=datetime(2025, 6, 22, 12, 10, 0, 0),
-            markers=["Streamd"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-            location={"project": "Streamd", "file": stream_file.file_name},
-        )
-
-    def test_timesheet_use_case(self):
-        stream_file = StreamFile(
-            file_name="20260131-210000 Test File.md",
-            shard=Shard(start_line=1, end_line=1, markers=["Timesheet", "Streamd"]),
-        )
-
-        assert localize_stream_file(
-            stream_file, repository_configuration
-        ) == LocalizedShard(
-            moment=datetime(2026, 1, 31, 21, 0, 0, 0),
-            markers=["Timesheet", "Streamd"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-            location={
-                "file": stream_file.file_name,
-                "project": "Streamd",
-                "timesheet": "coding",
-            },
-        )
-
-    def test_overwrites_true_propagated_dimension_overwrites_existing_value(self):
-        config = RepositoryConfiguration(
-            dimensions={
-                "project": Dimension(display_name="Project", propagate=True),
-            },
-            markers={
-                "A": Marker(
-                    display_name="A",
-                    placements=[MarkerPlacement(dimension="project", value="a")],
-                ),
-                "B": Marker(
-                    display_name="B",
-                    placements=[
-                        MarkerPlacement(dimension="project", value="b", overwrites=True)
-                    ],
-                ),
-            },
-        )
-
-        stream_file = StreamFile(
-            file_name="20260131-210000 Test File.md",
-            shard=Shard(start_line=1, end_line=1, markers=["A", "B"]),
-        )
-
-        assert localize_stream_file(stream_file, config) == LocalizedShard(
-            moment=datetime(2026, 1, 31, 21, 0, 0, 0),
-            markers=["A", "B"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-            location={"file": stream_file.file_name, "project": "b"},
-        )
-
-    def test_overwrites_false_propagated_dimension_does_not_overwrite_existing_value(
-        self,
-    ):
-        config = RepositoryConfiguration(
-            dimensions={
-                "project": Dimension(display_name="Project", propagate=True),
-            },
-            markers={
-                "A": Marker(
-                    display_name="A",
-                    placements=[MarkerPlacement(dimension="project", value="a")],
-                ),
-                "B": Marker(
-                    display_name="B",
-                    placements=[
-                        MarkerPlacement(
-                            dimension="project", value="b", overwrites=False
-                        )
-                    ],
-                ),
-            },
-        )
-
-        stream_file = StreamFile(
-            file_name="20260131-210000 Test File.md",
-            shard=Shard(start_line=1, end_line=1, markers=["A", "B"]),
-        )
-
-        assert localize_stream_file(stream_file, config) == LocalizedShard(
-            moment=datetime(2026, 1, 31, 21, 0, 0, 0),
-            markers=["A", "B"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-            location={"file": stream_file.file_name, "project": "a"},
-        )
-
-    def test_overwrites_true_non_propagated_dimension_overwrites_private_value(self):
-        config = RepositoryConfiguration(
-            dimensions={
-                "label": Dimension(display_name="Label", propagate=False),
-            },
-            markers={
-                "A": Marker(
-                    display_name="A",
-                    placements=[MarkerPlacement(dimension="label", value="a")],
-                ),
-                "B": Marker(
-                    display_name="B",
-                    placements=[
-                        MarkerPlacement(dimension="label", value="b", overwrites=True)
-                    ],
-                ),
-            },
-        )
-
-        stream_file = StreamFile(
-            file_name="20260131-210000 Test File.md",
-            shard=Shard(start_line=1, end_line=1, markers=["A", "B"]),
-        )
-
-        assert localize_stream_file(stream_file, config) == LocalizedShard(
-            moment=datetime(2026, 1, 31, 21, 0, 0, 0),
-            markers=["A", "B"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-            location={"file": stream_file.file_name, "label": "b"},
-        )
-
-    def test_overwrites_false_non_propagated_dimension_does_not_overwrite_private_value(
-        self,
-    ):
-        config = RepositoryConfiguration(
-            dimensions={
-                "label": Dimension(display_name="Label", propagate=False),
-            },
-            markers={
-                "A": Marker(
-                    display_name="A",
-                    placements=[
-                        MarkerPlacement(dimension="label", value="a", overwrites=True)
-                    ],
-                ),
-                "B": Marker(
-                    display_name="B",
-                    placements=[
-                        MarkerPlacement(dimension="label", value="b", overwrites=False)
-                    ],
-                ),
-            },
-        )
-
-        stream_file = StreamFile(
-            file_name="20260131-210000 Test File.md",
-            shard=Shard(start_line=1, end_line=1, markers=["A", "B"]),
-        )
-
-        assert localize_stream_file(stream_file, config) == LocalizedShard(
-            moment=datetime(2026, 1, 31, 21, 0, 0, 0),
-            markers=["A", "B"],
-            tags=[],
-            start_line=1,
-            end_line=1,
-            children=[],
-            location={"file": stream_file.file_name, "label": "a"},
-        )
diff --git a/tests/timesheet/test_extract_timesheets.py b/tests/timesheet/test_extract_timesheets.py
deleted file mode 100644
index b54befc..0000000
--- a/tests/timesheet/test_extract_timesheets.py
+++ /dev/null
@@ -1,288 +0,0 @@
-from __future__ import annotations
-
-from datetime import datetime, time
-
-import pytest
-
-from streamd.localize.localized_shard import LocalizedShard
-from streamd.timesheet.configuration import (
-    TIMESHEET_DIMENSION_NAME,
-    TimesheetPointType,
-)
-from streamd.timesheet.extract import extract_timesheets
-from streamd.timesheet.timecard import SpecialDayType, Timecard, Timesheet
-
-
-def point(at: datetime, type: TimesheetPointType) -> LocalizedShard:
-    """
-    Create a minimal LocalizedShard that will be interpreted as a timesheet point.
-
-    Note: The extract pipeline uses set-dimension filtering; we therefore ensure the
-    timesheet dimension is set in `location`.
-    """
-    return LocalizedShard(
-        moment=at,
-        markers=["Timesheet"],
-        tags=[],
-        start_line=1,
-        end_line=1,
-        children=[],
-        location={TIMESHEET_DIMENSION_NAME: type.value, "file": "dummy.md"},
-    )
-
-
-class TestExtractTimesheets:
-    def test_single_work_block(self):
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Card),
-            point(day.replace(hour=17, minute=30), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=False,
-                special_day_type=None,
-                timecards=[Timecard(from_time=time(9, 0), to_time=time(17, 30))],
-            )
-        ]
-
-    def test_three_work_blocks_separated_by_breaks(self):
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=7, minute=15), TimesheetPointType.Card),
-            point(day.replace(hour=12, minute=0), TimesheetPointType.Break),
-            point(day.replace(hour=12, minute=45), TimesheetPointType.Card),
-            point(day.replace(hour=15, minute=0), TimesheetPointType.Break),
-            point(day.replace(hour=16, minute=0), TimesheetPointType.Card),
-            point(day.replace(hour=17, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=False,
-                special_day_type=None,
-                timecards=[
-                    Timecard(from_time=time(7, 15), to_time=time(12, 0)),
-                    Timecard(from_time=time(12, 45), to_time=time(15, 0)),
-                    Timecard(from_time=time(16, 0), to_time=time(17, 0)),
-                ],
-            )
-        ]
-
-    def test_input_order_is_not_required_within_a_day(self):
-        """
-        Points may come unsorted; extraction should sort by timestamp within a day.
-        """
-        day = datetime(2026, 2, 1, 0, 0, 0)
-
-        shards = [
-            point(day.replace(hour=15, minute=0), TimesheetPointType.Break),
-            point(day.replace(hour=7, minute=15), TimesheetPointType.Card),
-            point(day.replace(hour=12, minute=0), TimesheetPointType.Break),
-            point(day.replace(hour=12, minute=45), TimesheetPointType.Card),
-            point(day.replace(hour=17, minute=0), TimesheetPointType.Break),
-            point(day.replace(hour=16, minute=0), TimesheetPointType.Card),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=False,
-                special_day_type=None,
-                timecards=[
-                    Timecard(from_time=time(7, 15), to_time=time(12, 0)),
-                    Timecard(from_time=time(12, 45), to_time=time(15, 0)),
-                    Timecard(from_time=time(16, 0), to_time=time(17, 0)),
-                ],
-            )
-        ]
-
-    def test_groups_by_day(self):
-        """
-        If points span multiple days, we should get one Timesheet per day.
-        """
-        day1 = datetime(2026, 2, 1, 0, 0, 0)
-        day2 = datetime(2026, 2, 2, 0, 0, 0)
-
-        shards = [
-            point(day2.replace(hour=10, minute=0), TimesheetPointType.Card),
-            point(day2.replace(hour=18, minute=0), TimesheetPointType.Break),
-            point(day1.replace(hour=9, minute=0), TimesheetPointType.Card),
-            point(day1.replace(hour=17, minute=0), TimesheetPointType.Break),
-        ]
-
-        # Note: current implementation groups by date using `itertools.groupby` on the
-        # incoming order; to be robust, we pass day1 points first, then day2 points.
-        # This asserts the intended behavior.
-        shards = [
-            point(day1.replace(hour=9, minute=0), TimesheetPointType.Card),
-            point(day1.replace(hour=17, minute=0), TimesheetPointType.Break),
-            point(day2.replace(hour=10, minute=0), TimesheetPointType.Card),
-            point(day2.replace(hour=18, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day1.date(),
-                is_sick_leave=False,
-                special_day_type=None,
-                timecards=[Timecard(from_time=time(9, 0), to_time=time(17, 0))],
-            ),
-            Timesheet(
-                date=day2.date(),
-                is_sick_leave=False,
-                special_day_type=None,
-                timecards=[Timecard(from_time=time(10, 0), to_time=time(18, 0))],
-            ),
-        ]
-
-    def test_day_with_only_special_day_type_vacation(self):
-        """
-        A day can be marked as Vacation without timecards; it should still produce a Timesheet.
-        """
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=8, minute=0), TimesheetPointType.Vacation),
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=False,
-                special_day_type=SpecialDayType.Vacation,
-                timecards=[],
-            )
-        ]
-
-    def test_day_with_only_special_day_type_holiday(self):
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=8, minute=0), TimesheetPointType.Holiday),
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=False,
-                special_day_type=SpecialDayType.Holiday,
-                timecards=[],
-            )
-        ]
-
-    def test_day_with_only_special_day_type_undertime(self):
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=8, minute=0), TimesheetPointType.Undertime),
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=False,
-                special_day_type=SpecialDayType.Undertime,
-                timecards=[],
-            )
-        ]
-
-    def test_day_with_sick_leave_and_timecards(self):
-        """
-        SickLeave should set the flag but not prevent timecard aggregation.
-        """
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=7, minute=30), TimesheetPointType.SickLeave),
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Card),
-            point(day.replace(hour=12, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=True,
-                special_day_type=None,
-                timecards=[Timecard(from_time=time(9, 0), to_time=time(12, 0))],
-            )
-        ]
-
-    def test_day_with_sick_leave_only(self):
-        """
-        A day with only SickLeave should still produce a Timesheet (no timecards).
-        """
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=8, minute=0), TimesheetPointType.SickLeave),
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == [
-            Timesheet(
-                date=day.date(),
-                is_sick_leave=True,
-                special_day_type=None,
-                timecards=[],
-            )
-        ]
-
-    def test_empty_input(self):
-        assert extract_timesheets([]) == []
-
-    def test_day_with_only_cards_and_no_break_is_invalid(self):
-        """
-        A day ending 'in work' (last point not a Break) should raise.
-        """
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Card),
-            point(day.replace(hour=12, minute=0), TimesheetPointType.Card),
-        ]
-
-        with pytest.raises(ValueError, match=r"Last Timecard of .* is not a break"):
-            _ = extract_timesheets(shards)
-
-    def test_two_special_day_types_same_day_is_invalid(self):
-        """
-        A day cannot be both Vacation and Holiday (or any two distinct special types).
-        """
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=8, minute=0), TimesheetPointType.Vacation),
-            point(day.replace(hour=8, minute=5), TimesheetPointType.Holiday),
-            point(day.replace(hour=9, minute=0), TimesheetPointType.Break),
-        ]
-
-        with pytest.raises(ValueError, match=r"is both .* and .*"):
-            _ = extract_timesheets(shards)
-
-    def test_points_with_mixed_dates_inside_one_group_raises(self):
-        """
-        Defensive: if aggregation receives points spanning multiple dates for a single day,
-        it should raise. (This can occur if higher-level grouping is incorrect.)
-        """
-        day1 = datetime(2026, 2, 1, 0, 0, 0)
-        day2 = datetime(2026, 2, 2, 0, 0, 0)
-
-        shards = [
-            point(day1.replace(hour=9, minute=0), TimesheetPointType.Card),
-            point(day2.replace(hour=9, minute=30), TimesheetPointType.Break),
-        ]
-
-        with pytest.raises(ValueError, match=r"Last Timecard of .* is not a break"):
-            _ = extract_timesheets(shards)
-
-    def test_day_with_only_breaks_is_ignored(self):
-        """
-        A day with no timecards and no sick/special markers should not emit a Timesheet.
-        """
-        day = datetime(2026, 2, 1, 0, 0, 0)
-        shards = [
-            point(day.replace(hour=12, minute=0), TimesheetPointType.Break),
-            point(day.replace(hour=13, minute=0), TimesheetPointType.Break),
-        ]
-
-        assert extract_timesheets(shards) == []
diff --git a/uv.lock b/uv.lock
deleted file mode 100644
index f5999a8..0000000
--- a/uv.lock
+++ /dev/null
@@ -1,438 +0,0 @@
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-requires-python = ">=3.13"
-
-[[package]]
-name = "annotated-doc"
-version = "0.0.4"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/57/ba/046ceea27344560984e26a590f90bc7f4a75b06701f653222458922b558c/annotated_doc-0.0.4.tar.gz", hash = "sha256:fbcda96e87e9c92ad167c2e53839e57503ecfda18804ea28102353485033faa4", size = 7288, upload-time = "2025-11-10T22:07:42.062Z" }
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-]
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-[[package]]
-name = "annotated-types"
-version = "0.7.0"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/ee/67/531ea369ba64dcff5ec9c3402f9f51bf748cec26dde048a2f973a4eea7f5/annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89", size = 16081, upload-time = "2024-05-20T21:33:25.928Z" }
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-name = "basedpyright"
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