Version 1.3.0

* feat: add sort_params helper in CrudFactory

* docs: add sorting

* fix: change sort_by to order_by

.github/workflows/build-release.yml

@@ -20,7 +20,7 @@ jobs:
         run: uv python install 3.14
 
       - name: Install dependencies
-        run: uv sync
+        run: uv sync --group dev
 
       - name: Build
         run: uv build

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
         run: uv python install 3.13
 
       - name: Install dependencies
-        run: uv sync --extra dev
+        run: uv sync --group dev
 
       - name: Run Ruff linter
         run: uv run ruff check .
@@ -45,7 +45,7 @@ jobs:
         run: uv python install 3.13
 
       - name: Install dependencies
-        run: uv sync --extra dev
+        run: uv sync --group dev
 
       - name: Run ty
         run: uv run ty check
@@ -83,7 +83,7 @@ jobs:
         run: uv python install ${{ matrix.python-version }}
 
       - name: Install dependencies
-        run: uv sync --extra dev
+        run: uv sync --group dev
 
       - name: Run tests with coverage
         env:

.github/workflows/docs.yml

@@ -0,0 +1,38 @@
+name: Documentation
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/configure-pages@v5
+
+      - uses: actions/checkout@v6
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
+      - name: Set up Python
+        run: uv python install 3.13
+
+      - run: uv sync --group dev
+
+      - run: uv run zensical build --clean
+
+      - uses: actions/upload-pages-artifact@v4
+        with:
+          path: site
+
+      - uses: actions/deploy-pages@v4
+        id: deployment

README.md

@@ -1,6 +1,6 @@
 # FastAPI Toolsets
 
-FastAPI Toolsets provides production-ready utilities for FastAPI applications built with async SQLAlchemy and PostgreSQL. It includes generic CRUD operations, a fixture system with dependency resolution, a Django-like CLI, standardized API responses, and structured exception handling with automatic OpenAPI documentation.
+A modular collection of production-ready utilities for FastAPI. Install only what you need — from async CRUD and database helpers to CLI tooling, Prometheus metrics, and pytest fixtures. Each module is independently installable via optional extras, keeping your dependency footprint minimal.
 
 [![CI](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml/badge.svg)](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/gh/d3vyce/fastapi-toolsets/graph/badge.svg)](https://codecov.io/gh/d3vyce/fastapi-toolsets)
@@ -20,20 +20,42 @@ FastAPI Toolsets provides production-ready utilities for FastAPI applications bu
 
 ## Installation
 
+The base package includes the core modules (CRUD, database, schemas, exceptions, fixtures, dependencies, logging):
+
 ```bash
 uv add fastapi-toolsets
 ```
 
+Install only the extras you need:
+
+```bash
+uv add "fastapi-toolsets[cli]"      # CLI (typer)
+uv add "fastapi-toolsets[metrics]"  # Prometheus metrics (prometheus_client)
+uv add "fastapi-toolsets[pytest]"   # Pytest helpers (httpx, pytest-xdist)
+```
+
+Or install everything:
+
+```bash
+uv add "fastapi-toolsets[all]"
+```
+
 ## Features
 
-- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in search with relationship traversal
+### Core
+
+- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in full-text/faceted search and Offset/Cursor pagination.
 - **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
 - **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
 - **Fixtures**: Fixture system with dependency management, context support, and pytest integration
-- **CLI**: Django-like command-line interface with fixture management and custom commands support
 - **Standardized API Responses**: Consistent response format with `Response`, `PaginatedResponse`, and `PydanticBase`
 - **Exception Handling**: Structured error responses with automatic OpenAPI documentation
 - **Logging**: Logging configuration with uvicorn integration via `configure_logging` and `get_logger`
+
+### Optional
+
+- **CLI**: Django-like command-line interface with fixture management and custom commands support
+- **Metrics**: Prometheus metrics endpoint with provider/collector registry
 - **Pytest Helpers**: Async test client, database session management, `pytest-xdist` support, and table cleanup utilities
 
 ## License

docs/examples/pagination-search.md

@@ -0,0 +1,134 @@
+# Pagination & search
+
+This example builds an articles listing endpoint that supports **offset pagination**, **cursor pagination**, **full-text search**, **faceted filtering**, and **sorting** — all from a single `CrudFactory` definition.
+
+## Models
+
+```python title="models.py"
+--8<-- "docs_src/examples/pagination_search/models.py"
+```
+
+## Schemas
+
+```python title="schemas.py"
+--8<-- "docs_src/examples/pagination_search/schemas.py"
+```
+
+## Crud
+
+Declare `searchable_fields`, `facet_fields`, and `order_fields` once on [`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory). All endpoints built from this class share the same defaults and can override them per call.
+
+```python title="crud.py"
+--8<-- "docs_src/examples/pagination_search/crud.py"
+```
+
+## Session dependency
+
+```python title="db.py"
+--8<-- "docs_src/examples/pagination_search/db.py"
+```
+
+!!! info "Deploy a Postgres DB with docker"
+    ```bash
+    docker run -d --name postgres -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=postgres -p 5432:5432 postgres:18-alpine
+    ```
+
+
+## App
+
+```python title="app.py"
+--8<-- "docs_src/examples/pagination_search/app.py"
+```
+
+
+## Routes
+### Offset pagination
+
+Best for admin panels or any UI that needs a total item count and numbered pages.
+
+```python title="routes.py:1:36"
+--8<-- "docs_src/examples/pagination_search/routes.py:1:36"
+```
+
+**Example request**
+
+```
+GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&order_by=title&order=asc
+```
+
+**Example response**
+
+```json
+{
+  "status": "SUCCESS",
+  "data": [
+    { "id": "3f47ac69-...", "title": "FastAPI tips", "status": "published", ... }
+  ],
+  "pagination": {
+    "total_count": 42,
+    "page": 2,
+    "items_per_page": 10,
+    "has_more": true
+  },
+  "filter_attributes": {
+    "status": ["archived", "draft", "published"],
+    "name": ["backend", "frontend", "python"]
+  }
+}
+```
+
+`filter_attributes` always reflects the values visible **after** applying the active filters. Use it to populate filter dropdowns on the client.
+
+### Cursor pagination
+
+Best for feeds, infinite scroll, or any high-throughput API where offset performance degrades.
+
+```python title="routes.py:39:59"
+--8<-- "docs_src/examples/pagination_search/routes.py:39:59"
+```
+
+**Example request**
+
+```
+GET /articles/cursor?items_per_page=10&status=published&order_by=created_at&order=desc
+```
+
+**Example response**
+
+```json
+{
+  "status": "SUCCESS",
+  "data": [
+    { "id": "3f47ac69-...", "title": "FastAPI tips", "status": "published", ... }
+  ],
+  "pagination": {
+    "next_cursor": "eyJ2YWx1ZSI6ICIzZjQ3YWM2OS0uLi4ifQ==",
+    "prev_cursor": null,
+    "items_per_page": 10,
+    "has_more": true
+  },
+  "filter_attributes": {
+    "status": ["published"],
+    "name": ["backend", "python"]
+  }
+}
+```
+
+Pass `next_cursor` as the `cursor` query parameter on the next request to advance to the next page.
+
+## Search behaviour
+
+Both endpoints inherit the same `searchable_fields` declared on `ArticleCrud`:
+
+Search is **case-insensitive** and uses a `LIKE %query%` pattern. Pass a [`SearchConfig`](../reference/crud.md#fastapi_toolsets.crud.search.SearchConfig) instead of a plain string to control case sensitivity or switch to `match_mode="all"` (AND across all fields instead of OR).
+
+```python
+from fastapi_toolsets.crud import SearchConfig
+
+# Both title AND body must contain "fastapi"
+result = await ArticleCrud.offset_paginate(
+    session,
+    search=SearchConfig(query="fastapi", case_sensitive=True, match_mode="all"),
+    search_fields=[Article.title, Article.body],
+)
+```

docs/index.md

@@ -0,0 +1,67 @@
+# FastAPI Toolsets
+
+A modular collection of production-ready utilities for FastAPI. Install only what you need — from async CRUD and database helpers to CLI tooling, Prometheus metrics, and pytest fixtures. Each module is independently installable via optional extras, keeping your dependency footprint minimal.
+
+[![CI](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml/badge.svg)](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/d3vyce/fastapi-toolsets/graph/badge.svg)](https://codecov.io/gh/d3vyce/fastapi-toolsets)
+[![ty](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ty/main/assets/badge/v0.json)](https://github.com/astral-sh/ty)
+[![uv](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/uv/main/assets/badge/v0.json)](https://github.com/astral-sh/uv)
+[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
+[![Python 3.11+](https://img.shields.io/badge/python-3.11+-blue.svg)](https://www.python.org/downloads/)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
+---
+
+**Documentation**: [https://fastapi-toolsets.d3vyce.fr](https://fastapi-toolsets.d3vyce.fr)
+
+**Source Code**: [https://github.com/d3vyce/fastapi-toolsets](https://github.com/d3vyce/fastapi-toolsets)
+
+---
+
+## Installation
+
+The base package includes the core modules (CRUD, database, schemas, exceptions, fixtures, dependencies, logging):
+
+```bash
+uv add fastapi-toolsets
+```
+
+Install only the extras you need:
+
+```bash
+uv add "fastapi-toolsets[cli]"      # CLI (typer)
+uv add "fastapi-toolsets[metrics]"  # Prometheus metrics (prometheus_client)
+uv add "fastapi-toolsets[pytest]"   # Pytest helpers (httpx, pytest-xdist)
+```
+
+Or install everything:
+
+```bash
+uv add "fastapi-toolsets[all]"
+```
+
+## Features
+
+### Core
+
+- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in full-text/faceted search and offset/cursor pagination.
+- **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
+- **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
+- **Fixtures**: Fixture system with dependency management, context support, and pytest integration
+- **Standardized API Responses**: Consistent response format with `Response`, `PaginatedResponse`, and `PydanticBase`
+- **Exception Handling**: Structured error responses with automatic OpenAPI documentation
+- **Logging**: Logging configuration with uvicorn integration via `configure_logging` and `get_logger`
+
+### Optional
+
+- **CLI**: Django-like command-line interface with fixture management and custom commands support
+- **Metrics**: Prometheus metrics endpoint with provider/collector registry
+- **Pytest Helpers**: Async test client, database session management, `pytest-xdist` support, and table cleanup utilities
+
+## License
+
+MIT License - see [LICENSE](LICENSE) for details.
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit issues and pull requests.

docs/module/cli.md

@@ -0,0 +1,93 @@
+# CLI
+
+Typer-based command-line interface for managing your FastAPI application, with built-in fixture commands integration.
+
+## Installation
+
+=== "uv"
+    ``` bash
+    uv add "fastapi-toolsets[cli]"
+    ```
+
+=== "pip"
+    ``` bash
+    pip install "fastapi-toolsets[cli]"
+    ```
+
+## Overview
+
+The `cli` module provides a `manager` entry point built with [Typer](https://typer.tiangolo.com/). It allow custom commands to be added in addition of the fixture commands when a [`FixtureRegistry`](../reference/fixtures.md#fastapi_toolsets.fixtures.registry.FixtureRegistry) and a database context are configured.
+
+## Configuration
+
+Configure the CLI in your `pyproject.toml`:
+
+```toml
+[tool.fastapi-toolsets]
+cli = "myapp.cli:cli"                   # Custom Typer app
+fixtures = "myapp.fixtures:registry"    # FixtureRegistry instance
+db_context = "myapp.db:db_context"      # Async context manager for sessions
+```
+
+All fields are optional. Without configuration, the `manager` command still works but no command are available.
+
+## Usage
+
+```bash
+# Manager commands
+manager --help
+
+ Usage: manager [OPTIONS] COMMAND [ARGS]...
+
+ FastAPI utilities CLI.
+
+╭─ Options ────────────────────────────────────────────────────────────────────────╮
+│ --install-completion          Install completion for the current shell.          │
+│ --show-completion             Show completion for the current shell, to copy it  │
+│                               or customize the installation.                     │
+│ --help                        Show this message and exit.                        │
+╰──────────────────────────────────────────────────────────────────────────────────╯
+╭─ Commands ───────────────────────────────────────────────────────────────────────╮
+│ check-db                                                                         │
+│ fixtures  Manage database fixtures.                                              │
+╰──────────────────────────────────────────────────────────────────────────────────╯
+
+# Fixtures commands
+manager fixtures --help
+
+ Usage: manager fixtures [OPTIONS] COMMAND [ARGS]...
+
+ Manage database fixtures.
+
+╭─ Options ────────────────────────────────────────────────────────────────────────╮
+│ --help          Show this message and exit.                                      │
+╰──────────────────────────────────────────────────────────────────────────────────╯
+╭─ Commands ───────────────────────────────────────────────────────────────────────╮
+│ list  List all registered fixtures.                                              │
+│ load  Load fixtures into the database.                                           │
+╰──────────────────────────────────────────────────────────────────────────────────╯
+```
+
+## Custom CLI
+
+You can extend the CLI by providing your own Typer app. The `manager` entry point will merge your app's commands with the built-in ones:
+
+```python
+# myapp/cli.py
+import typer
+
+cli = typer.Typer()
+
+@cli.command()
+def hello():
+    print("Hello from my app!")
+```
+
+```toml
+[tool.fastapi-toolsets]
+cli = "myapp.cli:cli"
+```
+
+---
+
+[:material-api: API Reference](../reference/cli.md)

docs/module/crud.md

@@ -0,0 +1,479 @@
+# CRUD
+
+Generic async CRUD operations for SQLAlchemy models with search, pagination, and many-to-many support.
+
+!!! info
+    This module has been coded and tested to be compatible with PostgreSQL only.
+
+## Overview
+
+The `crud` module provides [`AsyncCrud`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud), an abstract base class with a full suite of async database operations, and [`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory), a convenience function to instantiate it for a given model.
+
+## Creating a CRUD class
+
+```python
+from fastapi_toolsets.crud import CrudFactory
+from myapp.models import User
+
+UserCrud = CrudFactory(model=User)
+```
+
+[`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory) dynamically creates a class named `AsyncUserCrud` with `User` as its model.
+
+## Basic operations
+
+```python
+# Create
+user = await UserCrud.create(session=session, obj=UserCreateSchema(username="alice"))
+
+# Get one (raises NotFoundError if not found)
+user = await UserCrud.get(session=session, filters=[User.id == user_id])
+
+# Get first or None
+user = await UserCrud.first(session=session, filters=[User.email == email])
+
+# Get multiple
+users = await UserCrud.get_multi(session=session, filters=[User.is_active == True])
+
+# Update
+user = await UserCrud.update(session=session, obj=UserUpdateSchema(username="bob"), filters=[User.id == user_id])
+
+# Delete
+await UserCrud.delete(session=session, filters=[User.id == user_id])
+
+# Count / exists
+count = await UserCrud.count(session=session, filters=[User.is_active == True])
+exists = await UserCrud.exists(session=session, filters=[User.email == email])
+```
+
+## Pagination
+
+!!! info "Added in `v1.1` (only offset_pagination via `paginate` if `<v1.1`)"
+
+Two pagination strategies are available. Both return a [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse) but differ in how they navigate through results.
+
+| | `offset_paginate` | `cursor_paginate` |
+|---|---|---|
+| Total count | Yes | No |
+| Jump to arbitrary page | Yes | No |
+| Performance on deep pages | Degrades | Constant |
+| Stable under concurrent inserts | No | Yes |
+| Search compatible | Yes | Yes |
+| Use case | Admin panels, numbered pagination | Feeds, APIs, infinite scroll |
+
+### Offset pagination
+
+```python
+@router.get(
+    "",
+    response_model=PaginatedResponse[User],
+)
+async def get_users(
+    session: SessionDep,
+    items_per_page: int = 50,
+    page: int = 1,
+):
+    return await crud.UserCrud.offset_paginate(
+        session=session,
+        items_per_page=items_per_page,
+        page=page,
+    )
+```
+
+The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) method returns a [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse) whose `pagination` field is an [`OffsetPagination`](../reference/schemas.md#fastapi_toolsets.schemas.OffsetPagination) object:
+
+```json
+{
+  "status": "SUCCESS",
+  "data": ["..."],
+  "pagination": {
+    "total_count": 100,
+    "page": 1,
+    "items_per_page": 20,
+    "has_more": true
+  }
+}
+```
+
+!!! warning "Deprecated: `paginate`"
+    The `paginate` function is a backward-compatible alias for `offset_paginate`. This function is **deprecated** and will be removed in **v2.0**.
+
+### Cursor pagination
+
+```python
+@router.get(
+    "",
+    response_model=PaginatedResponse[UserRead],
+)
+async def list_users(
+    session: SessionDep,
+    cursor: str | None = None,
+    items_per_page: int = 20,
+):
+    return await UserCrud.cursor_paginate(
+        session=session,
+        cursor=cursor,
+        items_per_page=items_per_page,
+    )
+```
+
+The [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate) method returns a [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse) whose `pagination` field is a [`CursorPagination`](../reference/schemas.md#fastapi_toolsets.schemas.CursorPagination) object:
+
+```json
+{
+  "status": "SUCCESS",
+  "data": ["..."],
+  "pagination": {
+    "next_cursor": "eyJ2YWx1ZSI6ICIzZjQ3YWM2OS0uLi4ifQ==",
+    "prev_cursor": null,
+    "items_per_page": 20,
+    "has_more": true
+  }
+}
+```
+
+Pass `next_cursor` as the `cursor` query parameter on the next request to advance to the next page. `prev_cursor` is set on pages 2+ and points back to the first item of the current page. Both are `null` when there is no adjacent page.
+
+#### Choosing a cursor column
+
+The cursor column is set once on [`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory) via the `cursor_column` parameter. It must be monotonically ordered for stable results:
+
+- Auto-increment integer PKs
+- UUID v7 PKs
+- Timestamps
+
+!!! warning
+    Random UUID v4 PKs are **not** suitable as cursor columns because their ordering is non-deterministic.
+
+!!! note
+    `cursor_column` is required. Calling [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate) on a CRUD class that has no `cursor_column` configured raises a `ValueError`.
+
+The cursor value is base64-encoded when returned to the client and decoded back to the correct Python type on the next request. The following SQLAlchemy column types are supported:
+
+| SQLAlchemy type | Python type |
+|---|---|
+| `Integer`, `BigInteger`, `SmallInteger` | `int` |
+| `Uuid` | `uuid.UUID` |
+| `DateTime` | `datetime.datetime` |
+| `Date` | `datetime.date` |
+| `Float`, `Numeric` | `decimal.Decimal` |
+
+```python
+# Paginate by the primary key
+PostCrud = CrudFactory(model=Post, cursor_column=Post.id)
+
+# Paginate by a timestamp column instead
+PostCrud = CrudFactory(model=Post, cursor_column=Post.created_at)
+```
+
+## Search
+
+Two search strategies are available, both compatible with [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate).
+
+| | Full-text search | Faceted search |
+|---|---|---|
+| Input | Free-text string | Exact column values |
+| Relationship support | Yes | Yes |
+| Use case | Search bars | Filter dropdowns |
+
+!!! info "You can use both search strategies in the same endpoint!"
+
+### Full-text search
+
+Declare `searchable_fields` on the CRUD class. Relationship traversal is supported via tuples:
+
+```python
+PostCrud = CrudFactory(
+    model=Post,
+    searchable_fields=[
+        Post.title,
+        Post.content,
+        (Post.author, User.username),  # search across relationship
+    ],
+)
+```
+
+You can override `searchable_fields` per call with `search_fields`:
+
+```python
+result = await UserCrud.offset_paginate(
+    session=session,
+    search_fields=[User.country],
+)
+```
+
+This allows searching with both [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate):
+
+```python
+@router.get(
+    "",
+    response_model=PaginatedResponse[User],
+)
+async def get_users(
+    session: SessionDep,
+    items_per_page: int = 50,
+    page: int = 1,
+    search: str | None = None,
+):
+    return await crud.UserCrud.offset_paginate(
+        session=session,
+        items_per_page=items_per_page,
+        page=page,
+        search=search,
+    )
+```
+
+```python
+@router.get(
+    "",
+    response_model=PaginatedResponse[User],
+)
+async def get_users(
+    session: SessionDep,
+    cursor: str | None = None,
+    items_per_page: int = 50,
+    search: str | None = None,
+):
+    return await crud.UserCrud.cursor_paginate(
+        session=session,
+        items_per_page=items_per_page,
+        cursor=cursor,
+        search=search,
+    )
+```
+
+### Faceted search
+
+!!! info "Added in `v1.2`"
+
+Declare `facet_fields` on the CRUD class to return distinct column values alongside paginated results. This is useful for populating filter dropdowns or building faceted search UIs.
+
+Facet fields use the same syntax as `searchable_fields` — direct columns or relationship tuples:
+
+```python
+UserCrud = CrudFactory(
+    model=User,
+    facet_fields=[
+        User.status,
+        User.country,
+        (User.role, Role.name),  # value from a related model
+    ],
+)
+```
+
+You can override `facet_fields` per call:
+
+```python
+result = await UserCrud.offset_paginate(
+    session=session,
+    facet_fields=[User.country],
+)
+```
+
+The distinct values are returned in the `filter_attributes` field of [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse):
+
+```json
+{
+  "status": "SUCCESS",
+  "data": ["..."],
+  "pagination": { "..." },
+  "filter_attributes": {
+    "status": ["active", "inactive"],
+    "country": ["DE", "FR", "US"],
+    "name": ["admin", "editor", "viewer"]
+  }
+}
+```
+
+Use `filter_by` to pass the client's chosen filter values directly — no need to build SQLAlchemy conditions by hand. Any unknown key raises [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError).
+
+!!! info "The keys in `filter_by` are the same keys the client received in `filter_attributes`."
+    Keys are normally the terminal `column.key` (e.g. `"name"` for `Role.name`). When two facet fields share the same column key (e.g. `(Build.project, Project.name)` and `(Build.os, Os.name)`), the relationship name is prepended automatically: `"project__name"` and `"os__name"`.
+
+`filter_by` and `filters` can be combined — both are applied with AND logic.
+
+Use [`filter_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.filter_params) to generate a dict with the facet filter values from the query parameters:
+
+```python
+from typing import Annotated
+
+from fastapi import Depends
+
+UserCrud = CrudFactory(
+    model=User,
+    facet_fields=[User.status, User.country, (User.role, Role.name)],
+)
+
+@router.get("", response_model_exclude_none=True)
+async def list_users(
+    session: SessionDep,
+    page: int = 1,
+    filter_by: Annotated[dict[str, list[str]], Depends(UserCrud.filter_params())],
+) -> PaginatedResponse[UserRead]:
+    return await UserCrud.offset_paginate(
+        session=session,
+        page=page,
+        filter_by=filter_by,
+    )
+```
+
+Both single-value and multi-value query parameters work:
+
+```
+GET /users?status=active              → filter_by={"status": ["active"]}
+GET /users?status=active&country=FR   → filter_by={"status": ["active"], "country": ["FR"]}
+GET /users?role=admin&role=editor     → filter_by={"role": ["admin", "editor"]}  (IN clause)
+```
+
+## Sorting
+
+!!! info "Added in `v1.3`"
+
+Declare `order_fields` on the CRUD class to expose client-driven column ordering via `order_by` and `order` query parameters.
+
+```python
+UserCrud = CrudFactory(
+    model=User,
+    order_fields=[
+        User.name,
+        User.created_at,
+    ],
+)
+```
+
+Call [`order_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.order_params) to generate a FastAPI dependency that maps the query parameters to an [`OrderByClause`](../reference/crud.md#fastapi_toolsets.crud.factory.OrderByClause) expression:
+
+```python
+from typing import Annotated
+
+from fastapi import Depends
+from fastapi_toolsets.crud import OrderByClause
+
+@router.get("")
+async def list_users(
+    session: SessionDep,
+    order_by: Annotated[OrderByClause | None, Depends(UserCrud.order_params())],
+) -> PaginatedResponse[UserRead]:
+    return await UserCrud.offset_paginate(session=session, order_by=order_by)
+```
+
+The dependency adds two query parameters to the endpoint:
+
+| Parameter  | Type            |
+| ---------- | --------------- |
+| `order_by` | `str | null`   |
+| `order`    | `asc` or `desc` |
+
+```
+GET /users?order_by=name&order=asc   → ORDER BY users.name ASC
+GET /users?order_by=name&order=desc  → ORDER BY users.name DESC
+```
+
+An unknown `order_by` value raises [`InvalidOrderFieldError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError) (HTTP 422).
+
+You can also pass `order_fields` directly to `order_params()` to override the class-level defaults without modifying them:
+
+```python
+UserOrderParams = UserCrud.order_params(order_fields=[User.name])
+```
+
+## Relationship loading
+
+!!! info "Added in `v1.1`"
+
+By default, SQLAlchemy relationships are not loaded unless explicitly requested. Instead of using `lazy="selectin"` on model definitions (which is implicit and applies globally), define a `default_load_options` on the CRUD class to control loading strategy explicitly.
+
+!!! warning
+    Avoid using `lazy="selectin"` on model relationships. It fires silently on every query, cannot be disabled per-call, and can cause unexpected cascading loads through deep relationship chains. Use `default_load_options` instead.
+
+```python
+from sqlalchemy.orm import selectinload
+
+ArticleCrud = CrudFactory(
+    model=Article,
+    default_load_options=[
+        selectinload(Article.category),
+        selectinload(Article.tags),
+    ],
+)
+```
+
+`default_load_options` applies automatically to all read operations (`get`, `first`, `get_multi`, `offset_paginate`, `cursor_paginate`). When `load_options` is passed at call-site, it **fully replaces** `default_load_options` for that query — giving you precise per-call control:
+
+```python
+# Only loads category, tags are not loaded
+article = await ArticleCrud.get(
+    session=session,
+    filters=[Article.id == article_id],
+    load_options=[selectinload(Article.category)],
+)
+
+# Loads nothing — useful for write-then-refresh flows or lightweight checks
+articles = await ArticleCrud.get_multi(session=session, load_options=[])
+```
+
+## Many-to-many relationships
+
+Use `m2m_fields` to map schema fields containing lists of IDs to SQLAlchemy relationships. The CRUD class resolves and validates all IDs before persisting:
+
+```python
+PostCrud = CrudFactory(
+    model=Post,
+    m2m_fields={"tag_ids": Post.tags},
+)
+
+post = await PostCrud.create(session=session, obj=PostCreateSchema(title="Hello", tag_ids=[1, 2, 3]))
+```
+
+## Upsert
+
+Atomic `INSERT ... ON CONFLICT DO UPDATE` using PostgreSQL:
+
+```python
+await UserCrud.upsert(
+    session=session,
+    obj=UserCreateSchema(email="alice@example.com", username="alice"),
+    index_elements=[User.email],
+    set_={"username"},
+)
+```
+
+## Response serialization
+
+!!! info "Added in `v1.1`"
+
+Pass a Pydantic schema class to `create`, `get`, `update`, or `offset_paginate` to serialize the result directly into that schema and wrap it in a [`Response[schema]`](../reference/schemas.md#fastapi_toolsets.schemas.Response) or [`PaginatedResponse[schema]`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse):
+
+```python
+class UserRead(PydanticBase):
+    id: UUID
+    username: str
+
+@router.get(
+    "/{uuid}",
+    responses=generate_error_responses(NotFoundError),
+)
+async def get_user(session: SessionDep, uuid: UUID) -> Response[UserRead]:
+    return await crud.UserCrud.get(
+        session=session,
+        filters=[User.id == uuid],
+        schema=UserRead,
+    )
+
+@router.get("")
+async def list_users(session: SessionDep, page: int = 1) -> PaginatedResponse[UserRead]:
+    return await crud.UserCrud.offset_paginate(
+        session=session,
+        page=page,
+        schema=UserRead,
+    )
+```
+
+The schema must have `from_attributes=True` (or inherit from [`PydanticBase`](../reference/schemas.md#fastapi_toolsets.schemas.PydanticBase)) so it can be built from SQLAlchemy model instances.
+
+!!! warning "Deprecated: `as_response`"
+    The `as_response=True` parameter is **deprecated** and will be removed in **v2.0**. Replace it with `schema=YourSchema`.
+
+---
+
+[:material-api: API Reference](../reference/crud.md)

docs/module/db.md

@@ -0,0 +1,92 @@
+# DB
+
+SQLAlchemy async session management with transactions, table locking, and row-change polling.
+
+!!! info
+    This module has been coded and tested to be compatible with PostgreSQL only.
+
+## Overview
+
+The `db` module provides helpers to create FastAPI dependencies and context managers for `AsyncSession`, along with utilities for nested transactions, table lock and polling for row changes.
+
+## Session dependency
+
+Use [`create_db_dependency`](../reference/db.md#fastapi_toolsets.db.create_db_dependency) to create a FastAPI dependency that yields a session and auto-commits on success:
+
+```python
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
+from fastapi_toolsets.db import create_db_dependency
+
+engine = create_async_engine(url="postgresql+asyncpg://...", future=True)
+session_maker = async_sessionmaker(bind=engine, expire_on_commit=False)
+
+get_db = create_db_dependency(session_maker=session_maker)
+
+@router.get("/users")
+async def list_users(session: AsyncSession = Depends(get_db)):
+    ...
+```
+
+## Session context manager
+
+Use [`create_db_context`](../reference/db.md#fastapi_toolsets.db.create_db_context) for sessions outside request handlers (e.g. background tasks, CLI commands):
+
+```python
+from fastapi_toolsets.db import create_db_context
+
+db_context = create_db_context(session_maker=session_maker)
+
+async def seed():
+    async with db_context() as session:
+        ...
+```
+
+## Nested transactions
+
+[`get_transaction`](../reference/db.md#fastapi_toolsets.db.get_transaction) handles savepoints automatically, allowing safe nesting:
+
+```python
+from fastapi_toolsets.db import get_transaction
+
+async def create_user_with_role(session=session):
+    async with get_transaction(session=session):
+        ...
+        async with get_transaction(session=session):  # uses savepoint
+            ...
+```
+
+## Table locking
+
+[`lock_tables`](../reference/db.md#fastapi_toolsets.db.lock_tables) acquires PostgreSQL table-level locks before executing critical sections:
+
+```python
+from fastapi_toolsets.db import lock_tables
+
+async with lock_tables(session=session, tables=[User], mode="EXCLUSIVE"):
+    # No other transaction can modify User until this block exits
+    ...
+```
+
+Available lock modes are defined in [`LockMode`](../reference/db.md#fastapi_toolsets.db.LockMode): `ACCESS_SHARE`, `ROW_SHARE`, `ROW_EXCLUSIVE`, `SHARE_UPDATE_EXCLUSIVE`, `SHARE`, `SHARE_ROW_EXCLUSIVE`, `EXCLUSIVE`, `ACCESS_EXCLUSIVE`.
+
+## Row-change polling
+
+[`wait_for_row_change`](../reference/db.md#fastapi_toolsets.db.wait_for_row_change) polls a row until a specific column changes value, useful for waiting on async side effects:
+
+```python
+from fastapi_toolsets.db import wait_for_row_change
+
+# Wait up to 30s for order.status to change
+await wait_for_row_change(
+    session=session,
+    model=Order,
+    pk_value=order_id,
+    columns=[Order.status],
+    interval=1.0,
+    timeout=30.0,
+)
+```
+
+---
+
+[:material-api: API Reference](../reference/db.md)

docs/module/dependencies.md

@@ -0,0 +1,50 @@
+# Dependencies
+
+FastAPI dependency factories for automatic model resolution from path and body parameters.
+
+## Overview
+
+The `dependencies` module provides two factory functions that create FastAPI dependencies to fetch a model instance from the database automatically — either from a path parameter or from a request body field — and inject it directly into your route handler.
+
+## `PathDependency`
+
+[`PathDependency`](../reference/dependencies.md#fastapi_toolsets.dependencies.PathDependency) resolves a model from a URL path parameter and injects it into the route handler. Raises [`NotFoundError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NotFoundError) automatically if the record does not exist.
+
+```python
+from fastapi_toolsets.dependencies import PathDependency
+
+UserDep = PathDependency(model=User, field=User.id, session_dep=get_db)
+
+@router.get("/users/{user_id}")
+async def get_user(user: User = UserDep):
+    return user
+```
+
+By default the parameter name is inferred from the field (`user_id` for `User.id`). You can override it:
+
+```python
+UserDep = PathDependency(model=User, field=User.id, session_dep=get_db, param_name="id")
+
+@router.get("/users/{id}")
+async def get_user(user: User = UserDep):
+    return user
+```
+
+## `BodyDependency`
+
+[`BodyDependency`](../reference/dependencies.md#fastapi_toolsets.dependencies.BodyDependency) resolves a model from a field in the request body. Useful when a body contains a foreign key and you want the full object injected:
+
+```python
+from fastapi_toolsets.dependencies import BodyDependency
+
+RoleDep = BodyDependency(model=Role, field=Role.id, session_dep=get_db, body_field="role_id")
+
+@router.post("/users")
+async def create_user(body: UserCreateSchema, role: Role = RoleDep):
+    user = User(username=body.username, role=role)
+    ...
+```
+
+---
+
+[:material-api: API Reference](../reference/dependencies.md)

docs/module/exceptions.md

@@ -0,0 +1,86 @@
+# Exceptions
+
+Structured API exceptions with consistent error responses and automatic OpenAPI documentation.
+
+## Overview
+
+The `exceptions` module provides a set of pre-built HTTP exceptions and a FastAPI exception handler that formats all errors — including validation errors — into a uniform [`ErrorResponse`](../reference/schemas.md#fastapi_toolsets.schemas.ErrorResponse).
+
+## Setup
+
+Register the exception handlers on your FastAPI app at startup:
+
+```python
+from fastapi import FastAPI
+from fastapi_toolsets.exceptions import init_exceptions_handlers
+
+app = FastAPI()
+init_exceptions_handlers(app=app)
+```
+
+This registers handlers for:
+
+- [`ApiException`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ApiException) — all custom exceptions below
+- `RequestValidationError` — Pydantic request validation (422)
+- `ResponseValidationError` — Pydantic response validation (422)
+- `Exception` — unhandled errors (500)
+
+## Built-in exceptions
+
+| Exception | Status | Default message |
+|-----------|--------|-----------------|
+| [`UnauthorizedError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.UnauthorizedError) | 401 | Unauthorized |
+| [`ForbiddenError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ForbiddenError) | 403 | Forbidden |
+| [`NotFoundError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NotFoundError) | 404 | Not found |
+| [`ConflictError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ConflictError) | 409 | Conflict |
+| [`NoSearchableFieldsError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError) | 400 | No searchable fields |
+| [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError) | 400 | Invalid facet filter |
+
+```python
+from fastapi_toolsets.exceptions import NotFoundError
+
+@router.get("/users/{id}")
+async def get_user(id: int, session: AsyncSession = Depends(get_db)):
+    user = await UserCrud.first(session=session, filters=[User.id == id])
+    if not user:
+        raise NotFoundError
+    return user
+```
+
+## Custom exceptions
+
+Subclass [`ApiException`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ApiException) and define an `api_error` class variable:
+
+```python
+from fastapi_toolsets.exceptions import ApiException
+from fastapi_toolsets.schemas import ApiError
+
+class PaymentRequiredError(ApiException):
+    api_error = ApiError(
+        code=402,
+        msg="Payment required",
+        desc="Your subscription has expired.",
+        err_code="PAYMENT_REQUIRED",
+    )
+```
+
+## OpenAPI response documentation
+
+Use [`generate_error_responses`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.generate_error_responses) to add error schemas to your endpoint's OpenAPI spec:
+
+```python
+from fastapi_toolsets.exceptions import generate_error_responses, NotFoundError, ForbiddenError
+
+@router.get(
+    "/users/{id}",
+    responses=generate_error_responses(NotFoundError, ForbiddenError),
+)
+async def get_user(...): ...
+```
+
+!!! info
+    The pydantic validation error is automatically added by FastAPI.
+
+---
+
+[:material-api: API Reference](../reference/exceptions.md)

docs/module/fixtures.md

@@ -0,0 +1,123 @@
+# Fixtures
+
+Dependency-aware database seeding with context-based loading strategies.
+
+## Overview
+
+The `fixtures` module lets you define named fixtures with dependencies between them, then load them into the database in the correct order. Fixtures can be scoped to contexts (e.g. base data, testing data) so that only the relevant ones are loaded for each environment.
+
+## Defining fixtures
+
+```python
+from fastapi_toolsets.fixtures import FixtureRegistry, Context
+
+fixtures = FixtureRegistry()
+
+@fixtures.register
+def roles():
+    return [
+        Role(id=1, name="admin"),
+        Role(id=2, name="user"),
+    ]
+
+@fixtures.register(depends_on=["roles"], contexts=[Context.TESTING])
+def test_users():
+    return [
+        User(id=1, username="alice", role_id=1),
+        User(id=2, username="bob", role_id=2),
+    ]
+```
+
+Dependencies declared via `depends_on` are resolved topologically — `roles` will always be loaded before `test_users`.
+
+## Loading fixtures
+
+By context with [`load_fixtures_by_context`](../reference/fixtures.md#fastapi_toolsets.fixtures.utils.load_fixtures_by_context):
+
+```python
+from fastapi_toolsets.fixtures import load_fixtures_by_context
+
+async with db_context() as session:
+    await load_fixtures_by_context(session=session, registry=fixtures, context=Context.TESTING)
+```
+
+Directly with [`load_fixtures`](../reference/fixtures.md#fastapi_toolsets.fixtures.utils.load_fixtures):
+
+```python
+from fastapi_toolsets.fixtures import load_fixtures
+
+async with db_context() as session:
+    await load_fixtures(session=session, registry=fixtures)
+```
+
+## Contexts
+
+[`Context`](../reference/fixtures.md#fastapi_toolsets.fixtures.enum.Context) is an enum with predefined values:
+
+| Context | Description |
+|---------|-------------|
+| `Context.BASE` | Core data required in all environments |
+| `Context.TESTING` | Data only loaded during tests |
+| `Context.PRODUCTION` | Data only loaded in production |
+
+A fixture with no `contexts` defined takes `Context.BASE` by default.
+
+## Load strategies
+
+[`LoadStrategy`](../reference/fixtures.md#fastapi_toolsets.fixtures.enum.LoadStrategy) controls how the fixture loader handles rows that already exist:
+
+| Strategy | Description |
+|----------|-------------|
+| `LoadStrategy.INSERT` | Insert only, fail on duplicates |
+| `LoadStrategy.UPSERT` | Insert or update on conflict |
+| `LoadStrategy.SKIP` | Skip rows that already exist |
+
+## Merging registries
+
+Split fixtures definitions across modules and merge them:
+
+```python
+from myapp.fixtures.dev import dev_fixtures
+from myapp.fixtures.prod import prod_fixtures
+
+fixtures = fixturesRegistry()
+fixtures.include_registry(registry=dev_fixtures)
+fixtures.include_registry(registry=prod_fixtures)
+
+## Pytest integration
+
+Use [`register_fixtures`](../reference/pytest.md#fastapi_toolsets.pytest.plugin.register_fixtures) to expose each fixture in your registry as an injectable pytest fixture named `fixture_{name}` by default:
+
+```python
+# conftest.py
+import pytest
+from fastapi_toolsets.pytest import create_db_session, register_fixtures
+from app.fixtures import registry
+from app.models import Base
+
+DATABASE_URL = "postgresql+asyncpg://user:pass@localhost/test_db"
+
+@pytest.fixture
+async def db_session():
+    async with create_db_session(database_url=DATABASE_URL, base=Base, cleanup=True) as session:
+        yield session
+
+register_fixtures(registry=registry, namespace=globals())
+```
+
+```python
+# test_users.py
+async def test_user_can_login(fixture_users: list[User], fixture_roles: list[Role]):
+    ...
+```
+
+
+The load order is resolved automatically from the `depends_on` declarations in your registry. Each generated fixture receives `db_session` as a dependency and returns the list of loaded model instances.
+
+## CLI integration
+
+Fixtures can be triggered from the CLI. See the [CLI module](cli.md) for setup instructions.
+
+---
+
+[:material-api: API Reference](../reference/fixtures.md)

docs/module/logger.md

@@ -0,0 +1,39 @@
+# Logger
+
+Lightweight logging utilities with consistent formatting and uvicorn integration.
+
+## Overview
+
+The `logger` module provides two helpers: one to configure the root logger (and uvicorn loggers) at startup, and one to retrieve a named logger anywhere in your codebase.
+
+## Setup
+
+Call [`configure_logging`](../reference/logger.md#fastapi_toolsets.logger.configure_logging) once at application startup:
+
+```python
+from fastapi_toolsets.logger import configure_logging
+
+configure_logging(level="INFO")
+```
+
+This sets up a stdout handler with a consistent format and also configures uvicorn's access and error loggers so all log output shares the same style.
+
+## Getting a logger
+
+```python
+from fastapi_toolsets.logger import get_logger
+
+logger = get_logger(name=__name__)
+logger.info("User created")
+```
+
+When called without arguments, [`get_logger`](../reference/logger.md#fastapi_toolsets.logger.get_logger) auto-detects the caller's module name via frame inspection:
+
+```python
+# Equivalent to get_logger(name=__name__)
+logger = get_logger()
+```
+
+---
+
+[:material-api: API Reference](../reference/logger.md)

docs/module/metrics.md

@@ -0,0 +1,86 @@
+# Metrics
+
+Prometheus metrics integration with a decorator-based registry and multi-process support.
+
+## Installation
+
+=== "uv"
+    ``` bash
+    uv add "fastapi-toolsets[metrics]"
+    ```
+
+=== "pip"
+    ``` bash
+    pip install "fastapi-toolsets[metrics]"
+    ```
+
+## Overview
+
+The `metrics` module provides a [`MetricsRegistry`](../reference/metrics.md#fastapi_toolsets.metrics.registry.MetricsRegistry) to declare Prometheus metrics with decorators, and an [`init_metrics`](../reference/metrics.md#fastapi_toolsets.metrics.handler.init_metrics) function to mount a `/metrics` endpoint on your FastAPI app.
+
+## Setup
+
+```python
+from fastapi import FastAPI
+from fastapi_toolsets.metrics import MetricsRegistry, init_metrics
+
+app = FastAPI()
+metrics = MetricsRegistry()
+
+init_metrics(app=app, registry=metrics)
+```
+
+This mounts the `/metrics` endpoint that Prometheus can scrape.
+
+## Declaring metrics
+
+### Providers
+
+Providers are called once at startup and register metrics that are updated externally (e.g. counters, histograms):
+
+```python
+from prometheus_client import Counter, Histogram
+
+@metrics.register
+def http_requests():
+    return Counter("http_requests_total", "Total HTTP requests", ["method", "status"])
+
+@metrics.register
+def request_duration():
+    return Histogram("request_duration_seconds", "Request duration")
+```
+
+### Collectors
+
+Collectors are called on every scrape. Use them for metrics that reflect current state (e.g. gauges):
+
+```python
+@metrics.register(collect=True)
+def queue_depth():
+    gauge = Gauge("queue_depth", "Current queue depth")
+    gauge.set(get_current_queue_depth())
+```
+
+## Merging registries
+
+Split metrics definitions across modules and merge them:
+
+```python
+from myapp.metrics.http import http_metrics
+from myapp.metrics.db import db_metrics
+
+metrics = MetricsRegistry()
+metrics.include_registry(registry=http_metrics)
+metrics.include_registry(registry=db_metrics)
+```
+
+## Multi-process mode
+
+Multi-process support is enabled automatically when the `PROMETHEUS_MULTIPROC_DIR` environment variable is set. No code changes are required.
+
+!!! warning "Environment variable name"
+    The correct variable is `PROMETHEUS_MULTIPROC_DIR` (not `PROMETHEUS_MULTIPROCESS_DIR`).
+
+---
+
+[:material-api: API Reference](../reference/metrics.md)

docs/module/pytest.md

@@ -0,0 +1,86 @@
+# Pytest
+
+Testing helpers for FastAPI applications with async client, database sessions, and parallel worker support.
+
+## Installation
+
+=== "uv"
+    ``` bash
+    uv add "fastapi-toolsets[pytest]"
+    ```
+
+=== "pip"
+    ``` bash
+    pip install "fastapi-toolsets[pytest]"
+    ```
+
+## Overview
+
+The `pytest` module provides utilities for setting up async test clients, managing test database sessions, and supporting parallel test execution with `pytest-xdist`.
+
+## Creating an async client
+
+Use [`create_async_client`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_async_client) to get an `httpx.AsyncClient` configured for your FastAPI app:
+
+```python
+from fastapi_toolsets.pytest import create_async_client
+
+@pytest.fixture
+async def http_client(db_session):
+    async def _override_get_db():
+        yield db_session
+
+    async with create_async_client(
+        app=app,
+        base_url="http://127.0.0.1/api/v1",
+        dependency_overrides={get_db: _override_get_db},
+    ) as c:
+        yield c
+```
+
+## Database sessions in tests
+
+Use [`create_db_session`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_db_session) to create an isolated `AsyncSession` for a test:
+
+```python
+from fastapi_toolsets.pytest import create_db_session, create_worker_database
+
+@pytest.fixture(scope="session")
+async def worker_db_url():
+    async with create_worker_database(
+        database_url=str(settings.SQLALCHEMY_DATABASE_URI)
+    ) as url:
+        yield url
+
+
+@pytest.fixture
+async def db_session(worker_db_url):
+    async with create_db_session(
+        database_url=worker_db_url, base=Base, cleanup=True
+    ) as session:
+        yield session
+```
+
+!!! info
+    In this example, the database is reset between each test using the argument `cleanup=True`.
+
+## Parallel testing with pytest-xdist
+
+The examples above are already compatible with parallel test execution with `pytest-xdist`.
+
+## Cleaning up tables
+
+If you want to manually clean up a database you can use [`cleanup_tables`](../reference/pytest.md#fastapi_toolsets.pytest.utils.cleanup_tables), this will truncates all tables between tests for fast isolation:
+
+```python
+from fastapi_toolsets.pytest import cleanup_tables
+
+@pytest.fixture(autouse=True)
+async def clean(db_session):
+    yield
+    await cleanup_tables(session=db_session, base=Base)
+```
+
+---
+
+[:material-api: API Reference](../reference/pytest.md)

docs/module/schemas.md

@@ -0,0 +1,51 @@
+# Schemas
+
+Standardized Pydantic response models for consistent API responses across your FastAPI application.
+
+## Overview
+
+The `schemas` module provides generic response wrappers that enforce a uniform response structure. All models use `from_attributes=True` for ORM compatibility and `validate_assignment=True` for runtime type safety.
+
+## Response models
+
+### [`Response[T]`](../reference/schemas.md#fastapi_toolsets.schemas.Response)
+
+The most common wrapper for a single resource response.
+
+```python
+from fastapi_toolsets.schemas import Response
+
+@router.get("/users/{id}")
+async def get_user(user: User = UserDep) -> Response[UserSchema]:
+    return Response(data=user, message="User retrieved")
+```
+
+### [`PaginatedResponse[T]`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse)
+
+Wraps a list of items with pagination metadata and optional facet values.
+
+```python
+from fastapi_toolsets.schemas import PaginatedResponse, Pagination
+
+@router.get("/users")
+async def list_users() -> PaginatedResponse[UserSchema]:
+    return PaginatedResponse(
+        data=users,
+        pagination=Pagination(
+            total_count=100,
+            items_per_page=10,
+            page=1,
+            has_more=True,
+        ),
+    )
+```
+
+The optional `filter_attributes` field is populated when `facet_fields` are configured on the CRUD class (see [Filter attributes](crud.md#filter-attributes-facets)). It is `None` by default and can be hidden from API responses with `response_model_exclude_none=True`.
+
+### [`ErrorResponse`](../reference/schemas.md#fastapi_toolsets.schemas.ErrorResponse)
+
+Returned automatically by the exceptions handler.
+
+---
+
+[:material-api: API Reference](../reference/schemas.md)

docs/overrides/main.html

@@ -0,0 +1,7 @@
+{% extends "base.html" %} {% block extrahead %}
+<script
+    defer
+    src="https://analytics.d3vyce.fr/script.js"
+    data-website-id="338b8816-7b99-4c6a-82f3-15595be3fd47"
+></script>
+{{ super() }} {% endblock %}

docs/reference/cli.md

@@ -0,0 +1,27 @@
+# `cli`
+
+Here's the reference for the CLI configuration helpers used to load settings from `pyproject.toml`.
+
+You can import them directly from `fastapi_toolsets.cli.config`:
+
+```python
+from fastapi_toolsets.cli.config import (
+    import_from_string,
+    get_config_value,
+    get_fixtures_registry,
+    get_db_context,
+    get_custom_cli,
+)
+```
+
+## ::: fastapi_toolsets.cli.config.import_from_string
+
+## ::: fastapi_toolsets.cli.config.get_config_value
+
+## ::: fastapi_toolsets.cli.config.get_fixtures_registry
+
+## ::: fastapi_toolsets.cli.config.get_db_context
+
+## ::: fastapi_toolsets.cli.config.get_custom_cli
+
+## ::: fastapi_toolsets.cli.utils.async_command

docs/reference/crud.md

@@ -0,0 +1,20 @@
+# `crud`
+
+Here's the reference for the CRUD classes, factory, and search utilities.
+
+You can import the main symbols from `fastapi_toolsets.crud`:
+
+```python
+from fastapi_toolsets.crud import CrudFactory, AsyncCrud
+from fastapi_toolsets.crud.search import SearchConfig, get_searchable_fields, build_search_filters
+```
+
+## ::: fastapi_toolsets.crud.factory.AsyncCrud
+
+## ::: fastapi_toolsets.crud.factory.CrudFactory
+
+## ::: fastapi_toolsets.crud.search.SearchConfig
+
+## ::: fastapi_toolsets.crud.search.get_searchable_fields
+
+## ::: fastapi_toolsets.crud.search.build_search_filters

docs/reference/db.md

@@ -0,0 +1,28 @@
+# `db`
+
+Here's the reference for all database session utilities, transaction helpers, and locking functions.
+
+You can import them directly from `fastapi_toolsets.db`:
+
+```python
+from fastapi_toolsets.db import (
+    LockMode,
+    create_db_dependency,
+    create_db_context,
+    get_transaction,
+    lock_tables,
+    wait_for_row_change,
+)
+```
+
+## ::: fastapi_toolsets.db.LockMode
+
+## ::: fastapi_toolsets.db.create_db_dependency
+
+## ::: fastapi_toolsets.db.create_db_context
+
+## ::: fastapi_toolsets.db.get_transaction
+
+## ::: fastapi_toolsets.db.lock_tables
+
+## ::: fastapi_toolsets.db.wait_for_row_change

docs/reference/dependencies.md

@@ -0,0 +1,13 @@
+# `dependencies`
+
+Here's the reference for the FastAPI dependency factory functions.
+
+You can import them directly from `fastapi_toolsets.dependencies`:
+
+```python
+from fastapi_toolsets.dependencies import PathDependency, BodyDependency
+```
+
+## ::: fastapi_toolsets.dependencies.PathDependency
+
+## ::: fastapi_toolsets.dependencies.BodyDependency

docs/reference/exceptions.md

@@ -0,0 +1,40 @@
+# `exceptions`
+
+Here's the reference for all exception classes and handler utilities.
+
+You can import them directly from `fastapi_toolsets.exceptions`:
+
+```python
+from fastapi_toolsets.exceptions import (
+    ApiException,
+    UnauthorizedError,
+    ForbiddenError,
+    NotFoundError,
+    ConflictError,
+    NoSearchableFieldsError,
+    InvalidFacetFilterError,
+    InvalidOrderFieldError,
+    generate_error_responses,
+    init_exceptions_handlers,
+)
+```
+
+## ::: fastapi_toolsets.exceptions.exceptions.ApiException
+
+## ::: fastapi_toolsets.exceptions.exceptions.UnauthorizedError
+
+## ::: fastapi_toolsets.exceptions.exceptions.ForbiddenError
+
+## ::: fastapi_toolsets.exceptions.exceptions.NotFoundError
+
+## ::: fastapi_toolsets.exceptions.exceptions.ConflictError
+
+## ::: fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError
+
+## ::: fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError
+
+## ::: fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError
+
+## ::: fastapi_toolsets.exceptions.exceptions.generate_error_responses
+
+## ::: fastapi_toolsets.exceptions.handler.init_exceptions_handlers

docs/reference/fixtures.md

@@ -0,0 +1,31 @@
+# `fixtures`
+
+Here's the reference for the fixture registry, enums, and loading utilities.
+
+You can import them directly from `fastapi_toolsets.fixtures`:
+
+```python
+from fastapi_toolsets.fixtures import (
+    Context,
+    LoadStrategy,
+    Fixture,
+    FixtureRegistry,
+    load_fixtures,
+    load_fixtures_by_context,
+    get_obj_by_attr,
+)
+```
+
+## ::: fastapi_toolsets.fixtures.enum.Context
+
+## ::: fastapi_toolsets.fixtures.enum.LoadStrategy
+
+## ::: fastapi_toolsets.fixtures.registry.Fixture
+
+## ::: fastapi_toolsets.fixtures.registry.FixtureRegistry
+
+## ::: fastapi_toolsets.fixtures.utils.load_fixtures
+
+## ::: fastapi_toolsets.fixtures.utils.load_fixtures_by_context
+
+## ::: fastapi_toolsets.fixtures.utils.get_obj_by_attr

docs/reference/logger.md

@@ -0,0 +1,13 @@
+# `logger`
+
+Here's the reference for the logging utilities.
+
+You can import them directly from `fastapi_toolsets.logger`:
+
+```python
+from fastapi_toolsets.logger import configure_logging, get_logger
+```
+
+## ::: fastapi_toolsets.logger.configure_logging
+
+## ::: fastapi_toolsets.logger.get_logger

docs/reference/metrics.md

@@ -0,0 +1,15 @@
+# `metrics`
+
+Here's the reference for the Prometheus metrics registry and endpoint handler.
+
+You can import them directly from `fastapi_toolsets.metrics`:
+
+```python
+from fastapi_toolsets.metrics import Metric, MetricsRegistry, init_metrics
+```
+
+## ::: fastapi_toolsets.metrics.registry.Metric
+
+## ::: fastapi_toolsets.metrics.registry.MetricsRegistry
+
+## ::: fastapi_toolsets.metrics.handler.init_metrics

docs/reference/pytest.md

@@ -0,0 +1,28 @@
+# `pytest`
+
+Here's the reference for all testing utilities and pytest fixtures.
+
+You can import them directly from `fastapi_toolsets.pytest`:
+
+```python
+from fastapi_toolsets.pytest import (
+    register_fixtures,
+    create_async_client,
+    create_db_session,
+    worker_database_url,
+    create_worker_database,
+    cleanup_tables,
+)
+```
+
+## ::: fastapi_toolsets.pytest.plugin.register_fixtures
+
+## ::: fastapi_toolsets.pytest.utils.create_async_client
+
+## ::: fastapi_toolsets.pytest.utils.create_db_session
+
+## ::: fastapi_toolsets.pytest.utils.worker_database_url
+
+## ::: fastapi_toolsets.pytest.utils.create_worker_database
+
+## ::: fastapi_toolsets.pytest.utils.cleanup_tables

docs/reference/schemas.md

@@ -0,0 +1,34 @@
+# `schemas` module
+
+Here's the reference for all response models and types provided by the `schemas` module.
+
+You can import them directly from `fastapi_toolsets.schemas`:
+
+```python
+from fastapi_toolsets.schemas import (
+    PydanticBase,
+    ResponseStatus,
+    ApiError,
+    BaseResponse,
+    Response,
+    ErrorResponse,
+    Pagination,
+    PaginatedResponse,
+)
+```
+
+## ::: fastapi_toolsets.schemas.PydanticBase
+
+## ::: fastapi_toolsets.schemas.ResponseStatus
+
+## ::: fastapi_toolsets.schemas.ApiError
+
+## ::: fastapi_toolsets.schemas.BaseResponse
+
+## ::: fastapi_toolsets.schemas.Response
+
+## ::: fastapi_toolsets.schemas.ErrorResponse
+
+## ::: fastapi_toolsets.schemas.Pagination
+
+## ::: fastapi_toolsets.schemas.PaginatedResponse

docs_src/examples/pagination_search/app.py

@@ -0,0 +1,9 @@
+from fastapi import FastAPI
+
+from fastapi_toolsets.exceptions import init_exceptions_handlers
+
+from .routes import router
+
+app = FastAPI()
+init_exceptions_handlers(app=app)
+app.include_router(router=router)

docs_src/examples/pagination_search/crud.py

@@ -0,0 +1,21 @@
+from fastapi_toolsets.crud import CrudFactory
+
+from .models import Article, Category
+
+ArticleCrud = CrudFactory(
+    model=Article,
+    cursor_column=Article.created_at,
+    searchable_fields=[  # default fields for full-text search
+        Article.title,
+        Article.body,
+        (Article.category, Category.name),
+    ],
+    facet_fields=[  # fields exposed as filter dropdowns
+        Article.status,
+        (Article.category, Category.name),
+    ],
+    order_fields=[  # fields exposed for client-driven ordering
+        Article.title,
+        Article.created_at,
+    ],
+)

docs_src/examples/pagination_search/db.py

@@ -0,0 +1,17 @@
+from typing import Annotated
+
+from fastapi import Depends
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from fastapi_toolsets.db import create_db_context, create_db_dependency
+
+DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost:5432/postgres"
+
+engine = create_async_engine(url=DATABASE_URL, future=True)
+async_session_maker = async_sessionmaker(bind=engine, expire_on_commit=False)
+
+get_db = create_db_dependency(session_maker=async_session_maker)
+get_db_context = create_db_context(session_maker=async_session_maker)
+
+
+SessionDep = Annotated[AsyncSession, Depends(get_db)]

docs_src/examples/pagination_search/models.py

@@ -0,0 +1,36 @@
+import datetime
+import uuid
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text, func
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class Category(Base):
+    __tablename__ = "categories"
+
+    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(64), unique=True)
+
+    articles: Mapped[list["Article"]] = relationship(back_populates="category")
+
+
+class Article(Base):
+    __tablename__ = "articles"
+
+    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
+    created_at: Mapped[datetime.datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+    title: Mapped[str] = mapped_column(String(256))
+    body: Mapped[str] = mapped_column(Text)
+    status: Mapped[str] = mapped_column(String(32))
+    published: Mapped[bool] = mapped_column(Boolean, default=False)
+    category_id: Mapped[uuid.UUID | None] = mapped_column(
+        ForeignKey("categories.id"), nullable=True
+    )
+
+    category: Mapped["Category | None"] = relationship(back_populates="articles")

docs_src/examples/pagination_search/routes.py

@@ -0,0 +1,59 @@
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, Query
+
+from fastapi_toolsets.crud import OrderByClause
+from fastapi_toolsets.schemas import PaginatedResponse
+
+from .crud import ArticleCrud
+from .db import SessionDep
+from .models import Article
+from .schemas import ArticleRead
+
+router = APIRouter(prefix="/articles")
+
+
+@router.get("/offset")
+async def list_articles_offset(
+    session: SessionDep,
+    filter_by: Annotated[dict[str, list[str]], Depends(ArticleCrud.filter_params())],
+    order_by: Annotated[
+        OrderByClause | None,
+        Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+    ],
+    page: int = Query(1, ge=1),
+    items_per_page: int = Query(20, ge=1, le=100),
+    search: str | None = None,
+) -> PaginatedResponse[ArticleRead]:
+    return await ArticleCrud.offset_paginate(
+        session=session,
+        page=page,
+        items_per_page=items_per_page,
+        search=search,
+        filter_by=filter_by or None,
+        order_by=order_by,
+        schema=ArticleRead,
+    )
+
+
+@router.get("/cursor")
+async def list_articles_cursor(
+    session: SessionDep,
+    filter_by: Annotated[dict[str, list[str]], Depends(ArticleCrud.filter_params())],
+    order_by: Annotated[
+        OrderByClause | None,
+        Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+    ],
+    cursor: str | None = None,
+    items_per_page: int = Query(20, ge=1, le=100),
+    search: str | None = None,
+) -> PaginatedResponse[ArticleRead]:
+    return await ArticleCrud.cursor_paginate(
+        session=session,
+        cursor=cursor,
+        items_per_page=items_per_page,
+        search=search,
+        filter_by=filter_by or None,
+        order_by=order_by,
+        schema=ArticleRead,
+    )

docs_src/examples/pagination_search/schemas.py

@@ -0,0 +1,13 @@
+import datetime
+import uuid
+
+from fastapi_toolsets.schemas import PydanticBase
+
+
+class ArticleRead(PydanticBase):
+    id: uuid.UUID
+    created_at: datetime.datetime
+    title: str
+    status: str
+    published: bool
+    category_id: uuid.UUID | None

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "fastapi-toolsets"
-version = "0.9.0"
+version = "1.3.0"
-description = "Reusable tools for FastAPI: async CRUD, fixtures, CLI, and standardized responses for SQLAlchemy + PostgreSQL"
+description = "Production-ready utilities for FastAPI applications"
 readme = "README.md"
 license = "MIT"
 license-files = ["LICENSE"]
@@ -11,7 +11,7 @@ authors = [
 ]
 keywords = ["fastapi", "sqlalchemy", "postgresql"]
 classifiers = [
-    "Development Status :: 4 - Beta",
+    "Development Status :: 5 - Production/Stable",
     "Framework :: AsyncIO",
     "Framework :: FastAPI",
     "Framework :: Pydantic",
@@ -31,12 +31,10 @@ classifiers = [
     "Typing :: Typed",
 ]
 dependencies = [
-    "fastapi>=0.100.0",
-    "sqlalchemy[asyncio]>=2.0",
     "asyncpg>=0.29.0",
+    "fastapi>=0.100.0",
     "pydantic>=2.0",
-    "typer>=0.9.0",
+    "sqlalchemy[asyncio]>=2.0",
-    "httpx>=0.25.0",
 ]
 
 [project.urls]
@@ -46,22 +44,45 @@ Repository = "https://github.com/d3vyce/fastapi-toolsets"
 Issues = "https://github.com/d3vyce/fastapi-toolsets/issues"
 
 [project.optional-dependencies]
-test = [
+cli = [
-    "pytest>=8.0.0",
+    "typer>=0.9.0",
-    "pytest-anyio>=0.0.0",
-    "pytest-xdist>=3.0.0",
-    "coverage>=7.0.0",
-    "pytest-cov>=4.0.0",
 ]
-dev = [
+metrics = [
-    "fastapi-toolsets[test]",
+    "prometheus_client>=0.20.0",
-    "ruff>=0.1.0",
+]
-    "ty>=0.0.1a0",
+pytest = [
+    "httpx>=0.25.0",
+    "pytest-xdist>=3.0.0",
+    "pytest>=8.0.0",
+]
+all = [
+    "fastapi-toolsets[cli,metrics,pytest]",
 ]
 
 [project.scripts]
 manager = "fastapi_toolsets.cli.app:cli"
 
+[dependency-groups]
+dev = [
+    {include-group = "tests"},
+    {include-group = "docs"},
+    "fastapi-toolsets[all]",
+    "ruff>=0.1.0",
+    "ty>=0.0.1a0",
+]
+tests = [
+    "coverage>=7.0.0",
+    "httpx>=0.25.0",
+    "pytest-anyio>=0.0.0",
+    "pytest-cov>=4.0.0",
+    "pytest-xdist>=3.0.0",
+    "pytest>=8.0.0",
+]
+docs = [
+    "mkdocstrings-python>=2.0.2",
+    "zensical>=0.0.23",
+]
+
 [build-system]
 requires = ["uv_build>=0.10,<0.11.0"]
 build-backend = "uv_build"

src/fastapi_toolsets/__init__.py

@@ -21,4 +21,4 @@ Example usage:
         return Response(data={"user": user.username}, message="Success")
 """
 
-__version__ = "0.9.0"
+__version__ = "1.3.0"

src/fastapi_toolsets/_imports.py

@@ -0,0 +1,9 @@
+"""Optional dependency helpers."""
+
+
+def require_extra(package: str, extra: str) -> None:
+    """Raise *ImportError* with an actionable install instruction."""
+    raise ImportError(
+        f"'{package}' is required to use this module. "
+        f"Install it with: pip install fastapi-toolsets[{extra}]"
+    )

src/fastapi_toolsets/cli/app.py

@@ -1,6 +1,11 @@
 """Main CLI application."""
 
-import typer
+try:
+    import typer
+except ImportError:
+    from .._imports import require_extra
+
+    require_extra(package="typer", extra="cli")
 
 from ..logger import configure_logging
 from .config import get_custom_cli

src/fastapi_toolsets/cli/config.py

@@ -1,12 +1,18 @@
 """CLI configuration and dynamic imports."""
 
+from __future__ import annotations
+
 import importlib
 import sys
+from typing import TYPE_CHECKING, Any, Literal, overload
 
 import typer
 
 from .pyproject import find_pyproject, load_pyproject
 
+if TYPE_CHECKING:
+    from ..fixtures import FixtureRegistry
+
 
 def _ensure_project_in_path():
     """Add project root to sys.path if not installed in editable mode."""
@@ -17,7 +23,7 @@ def _ensure_project_in_path():
             sys.path.insert(0, project_root)
 
 
-def import_from_string(import_path: str):
+def import_from_string(import_path: str) -> Any:
     """Import an object from a dotted string path.
 
     Args:
@@ -51,7 +57,13 @@ def import_from_string(import_path: str):
     return getattr(module, attr_name)
 
 
-def get_config_value(key: str, required: bool = False):
+@overload
+def get_config_value(key: str, required: Literal[True]) -> Any: ...  # pragma: no cover
+@overload
+def get_config_value(
+    key: str, required: bool = False
+) -> Any | None: ...  # pragma: no cover
+def get_config_value(key: str, required: bool = False) -> Any | None:
     """Get a configuration value from pyproject.toml.
 
     Args:
@@ -76,7 +88,7 @@ def get_config_value(key: str, required: bool = False):
     return value
 
 
-def get_fixtures_registry():
+def get_fixtures_registry() -> FixtureRegistry:
     """Import and return the fixtures registry from config."""
     from ..fixtures import FixtureRegistry
 
@@ -91,7 +103,7 @@ def get_fixtures_registry():
     return registry
 
 
-def get_db_context():
+def get_db_context() -> Any:
     """Import and return the db_context function from config."""
     import_path = get_config_value("db_context", required=True)
     return import_from_string(import_path)

src/fastapi_toolsets/cli/utils.py

@@ -13,11 +13,13 @@ def async_command(func: Callable[P, Coroutine[Any, Any, T]]) -> Callable[P, T]:
     """Decorator to run an async function as a sync CLI command.
 
     Example:
+        ```python
         @fixture_cli.command("load")
         @async_command
         async def load(ctx: typer.Context) -> None:
             async with get_db_context() as session:
                 await load_fixtures(session, registry)
+        ```
     """
 
     @functools.wraps(func)

src/fastapi_toolsets/crud/__init__.py

@@ -1,15 +1,21 @@
 """Generic async CRUD operations for SQLAlchemy models."""
 
-from ..exceptions import NoSearchableFieldsError
+from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
-from .factory import CrudFactory
+from .factory import CrudFactory, JoinType, M2MFieldType, OrderByClause
 from .search import (
+    FacetFieldType,
     SearchConfig,
     get_searchable_fields,
 )
 
 __all__ = [
     "CrudFactory",
+    "FacetFieldType",
     "get_searchable_fields",
+    "InvalidFacetFilterError",
+    "JoinType",
+    "M2MFieldType",
     "NoSearchableFieldsError",
+    "OrderByClause",
     "SearchConfig",
 ]

src/fastapi_toolsets/crud/search.py

@@ -1,19 +1,23 @@
 """Search utilities for AsyncCrud."""
 
+import asyncio
+from collections import Counter
 from collections.abc import Sequence
 from dataclasses import dataclass
 from typing import TYPE_CHECKING, Any, Literal
 
-from sqlalchemy import String, or_
+from sqlalchemy import String, or_, select
+from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 from sqlalchemy.orm.attributes import InstrumentedAttribute
 
-from ..exceptions import NoSearchableFieldsError
+from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
 
 if TYPE_CHECKING:
     from sqlalchemy.sql.elements import ColumnElement
 
 SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
+FacetFieldType = SearchFieldType
 
 
 @dataclass
@@ -89,6 +93,9 @@ def build_search_filters(
 
     Returns:
         Tuple of (filter_conditions, joins_needed)
+
+    Raises:
+        NoSearchableFieldsError: If no searchable field has been configured
     """
     # Normalize input
     if isinstance(search, str):
@@ -136,7 +143,7 @@ def build_search_filters(
         else:
             filters.append(column_as_string.ilike(f"%{query}%"))
 
-    if not filters:
+    if not filters:  # pragma: no cover
         return [], []
 
     # Combine based on match_mode
@@ -144,3 +151,145 @@ def build_search_filters(
         return [or_(*filters)], joins
     else:
         return filters, joins
+
+
+def facet_keys(facet_fields: Sequence[FacetFieldType]) -> list[str]:
+    """Return a key for each facet field, disambiguating duplicate column keys.
+
+    Args:
+        facet_fields: Sequence of facet fields — either direct columns or
+            relationship tuples ``(rel, ..., column)``.
+
+    Returns:
+        A list of string keys, one per facet field, in the same order.
+    """
+    raw: list[tuple[str, str | None]] = []
+    for field in facet_fields:
+        if isinstance(field, tuple):
+            rel = field[-2]
+            column = field[-1]
+            raw.append((column.key, rel.key))
+        else:
+            raw.append((field.key, None))
+
+    counts = Counter(col_key for col_key, _ in raw)
+    keys: list[str] = []
+    for col_key, rel_key in raw:
+        if counts[col_key] > 1 and rel_key is not None:
+            keys.append(f"{rel_key}__{col_key}")
+        else:
+            keys.append(col_key)
+    return keys
+
+
+async def build_facets(
+    session: "AsyncSession",
+    model: type[DeclarativeBase],
+    facet_fields: Sequence[FacetFieldType],
+    *,
+    base_filters: "list[ColumnElement[bool]] | None" = None,
+    base_joins: list[InstrumentedAttribute[Any]] | None = None,
+) -> dict[str, list[Any]]:
+    """Return distinct values for each facet field, respecting current filters.
+
+    Args:
+        session: DB async session
+        model: SQLAlchemy model class
+        facet_fields: Columns or relationship tuples to facet on
+        base_filters: Filter conditions already applied to the main query (search + caller filters)
+        base_joins: Relationship joins already applied to the main query
+
+    Returns:
+        Dict mapping column key to sorted list of distinct non-None values
+    """
+    existing_join_keys: set[str] = {str(j) for j in (base_joins or [])}
+
+    keys = facet_keys(facet_fields)
+
+    async def _query_facet(field: FacetFieldType, key: str) -> tuple[str, list[Any]]:
+        if isinstance(field, tuple):
+            # Relationship chain: (User.role, Role.name) — last element is the column
+            rels = field[:-1]
+            column = field[-1]
+        else:
+            rels = ()
+            column = field
+
+        q = select(column).select_from(model).distinct()
+
+        # Apply base joins (already done on main query, but needed here independently)
+        for rel in base_joins or []:
+            q = q.outerjoin(rel)
+
+        # Add any extra joins required by this facet field that aren't already in base_joins
+        for rel in rels:
+            if str(rel) not in existing_join_keys:
+                q = q.outerjoin(rel)
+
+        if base_filters:
+            from sqlalchemy import and_
+
+            q = q.where(and_(*base_filters))
+
+        q = q.order_by(column)
+        result = await session.execute(q)
+        values = [row[0] for row in result.all() if row[0] is not None]
+        return key, values
+
+    pairs = await asyncio.gather(
+        *[_query_facet(f, k) for f, k in zip(facet_fields, keys)]
+    )
+    return dict(pairs)
+
+
+def build_filter_by(
+    filter_by: dict[str, Any],
+    facet_fields: Sequence[FacetFieldType],
+) -> tuple["list[ColumnElement[bool]]", list[InstrumentedAttribute[Any]]]:
+    """Translate a {column_key: value} dict into SQLAlchemy filter conditions.
+
+    Args:
+        filter_by: Mapping of column key to scalar value or list of values
+        facet_fields: Declared facet fields to validate keys against
+
+    Returns:
+        Tuple of (filter_conditions, joins_needed)
+
+    Raises:
+        InvalidFacetFilterError: If a key in filter_by is not a declared facet field
+    """
+    index: dict[
+        str, tuple[InstrumentedAttribute[Any], list[InstrumentedAttribute[Any]]]
+    ] = {}
+    for key, field in zip(facet_keys(facet_fields), facet_fields):
+        if isinstance(field, tuple):
+            rels = list(field[:-1])
+            column = field[-1]
+        else:
+            rels = []
+            column = field
+        index[key] = (column, rels)
+
+    valid_keys = set(index)
+    filters: list[ColumnElement[bool]] = []
+    joins: list[InstrumentedAttribute[Any]] = []
+    added_join_keys: set[str] = set()
+
+    for key, value in filter_by.items():
+        if key not in index:
+            raise InvalidFacetFilterError(key, valid_keys)
+
+        column, rels = index[key]
+
+        for rel in rels:
+            rel_key = str(rel)
+            if rel_key not in added_join_keys:
+                joins.append(rel)
+                added_join_keys.add(rel_key)
+
+        if isinstance(value, list):
+            filters.append(column.in_(value))
+        else:
+            filters.append(column == value)
+
+    return filters, joins

src/fastapi_toolsets/db.py

@@ -35,6 +35,7 @@ def create_db_dependency(
         An async generator function usable with FastAPI's Depends()
 
     Example:
+        ```python
         from fastapi import Depends
         from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
         from fastapi_toolsets.db import create_db_dependency
@@ -46,6 +47,7 @@ def create_db_dependency(
         @app.get("/users")
         async def list_users(session: AsyncSession = Depends(get_db)):
             ...
+        ```
     """
 
     async def get_db() -> AsyncGenerator[AsyncSession, None]:
@@ -72,6 +74,7 @@ def create_db_context(
         An async context manager function
 
     Example:
+        ```python
         from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
         from fastapi_toolsets.db import create_db_context
 
@@ -83,6 +86,7 @@ def create_db_context(
             async with get_db_context() as session:
                 user = await UserCrud.get(session, [User.id == 1])
                 ...
+        ```
     """
     get_db = create_db_dependency(session_maker)
     return asynccontextmanager(get_db)
@@ -104,9 +108,11 @@ async def get_transaction(
         The session within the transaction context
 
     Example:
+        ```python
         async with get_transaction(session):
             session.add(model)
             # Auto-commits on exit, rolls back on exception
+        ```
     """
     if session.in_transaction():
         async with session.begin_nested():
@@ -158,6 +164,7 @@ async def lock_tables(
         SQLAlchemyError: If lock cannot be acquired within timeout
 
     Example:
+        ```python
         from fastapi_toolsets.db import lock_tables, LockMode
 
         async with lock_tables(session, [User, Account]):
@@ -169,6 +176,7 @@ async def lock_tables(
         async with lock_tables(session, [Order], mode=LockMode.EXCLUSIVE):
             # Exclusive lock - no other transactions can access
             await process_order(session, order_id)
+        ```
     """
     table_names = ",".join(table.__tablename__ for table in tables)
 
@@ -212,6 +220,7 @@ async def wait_for_row_change(
         TimeoutError: If timeout expires before a change is detected
 
     Example:
+        ```python
         from fastapi_toolsets.db import wait_for_row_change
 
         # Wait for any column to change
@@ -224,6 +233,7 @@ async def wait_for_row_change(
             interval=1.0,
             timeout=30.0,
         )
+        ```
     """
     instance = await session.get(model, pk_value)
     if instance is None:

src/fastapi_toolsets/dependencies.py

@@ -8,7 +8,9 @@ from fastapi import Depends
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 
-from ..crud import CrudFactory
+from .crud import CrudFactory
+
+__all__ = ["BodyDependency", "PathDependency"]
 
 ModelType = TypeVar("ModelType", bound=DeclarativeBase)
 SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]
@@ -36,12 +38,14 @@ def PathDependency(
         NotFoundError: If no matching record is found
 
     Example:
+        ```python
         UserDep = PathDependency(User, User.id, session_dep=get_db)
 
         @router.get("/user/{id}")
         async def get(
             user: User = UserDep,
         ): ...
+        ```
     """
     crud = CrudFactory(model)
     name = (
@@ -100,6 +104,7 @@ def BodyDependency(
         NotFoundError: If no matching record is found
 
     Example:
+        ```python
         UserDep = BodyDependency(
             User, User.ctfd_id, session_dep=get_db, body_field="user_id"
         )
@@ -108,6 +113,7 @@ def BodyDependency(
         async def assign(
             user: User = UserDep,
         ): ...
+        ```
     """
     crud = CrudFactory(model)
     python_type = field.type.python_type

src/fastapi_toolsets/dependencies/__init__.py

@@ -1,5 +0,0 @@
-"""FastAPI dependency factories for database objects."""
-
-from .factory import BodyDependency, PathDependency
-
-__all__ = ["BodyDependency", "PathDependency"]

src/fastapi_toolsets/exceptions/__init__.py

@@ -5,6 +5,8 @@ from .exceptions import (
     ApiException,
     ConflictError,
     ForbiddenError,
+    InvalidFacetFilterError,
+    InvalidOrderFieldError,
     NoSearchableFieldsError,
     NotFoundError,
     UnauthorizedError,
@@ -19,6 +21,8 @@ __all__ = [
     "ForbiddenError",
     "generate_error_responses",
     "init_exceptions_handlers",
+    "InvalidFacetFilterError",
+    "InvalidOrderFieldError",
     "NoSearchableFieldsError",
     "NotFoundError",
     "UnauthorizedError",

src/fastapi_toolsets/exceptions/exceptions.py

@@ -12,6 +12,7 @@ class ApiException(Exception):
     The exception handler will use api_error to generate the response.
 
     Example:
+        ```python
         class CustomError(ApiException):
             api_error = ApiError(
                 code=400,
@@ -19,6 +20,7 @@ class ApiException(Exception):
                 desc="The request was invalid.",
                 err_code="CUSTOM-400",
             )
+        ```
     """
 
     api_error: ClassVar[ApiError]
@@ -76,55 +78,6 @@ class ConflictError(ApiException):
     )
 
 
-class InsufficientRolesError(ForbiddenError):
-    """User does not have the required roles."""
-
-    api_error = ApiError(
-        code=403,
-        msg="Insufficient Roles",
-        desc="You do not have the required roles to access this resource.",
-        err_code="RBAC-403",
-    )
-
-    def __init__(self, required_roles: list[str], user_roles: set[str] | None = None):
-        """Initialize the exception.
-
-        Args:
-            required_roles: Roles needed to access the resource
-            user_roles: Roles the current user has, if known
-        """
-        self.required_roles = required_roles
-        self.user_roles = user_roles
-
-        desc = f"Required roles: {', '.join(required_roles)}"
-        if user_roles is not None:
-            desc += f". User has: {', '.join(user_roles) if user_roles else 'no roles'}"
-
-        super().__init__(desc)
-
-
-class UserNotFoundError(NotFoundError):
-    """User was not found."""
-
-    api_error = ApiError(
-        code=404,
-        msg="User Not Found",
-        desc="The requested user was not found.",
-        err_code="USER-404",
-    )
-
-
-class RoleNotFoundError(NotFoundError):
-    """Role was not found."""
-
-    api_error = ApiError(
-        code=404,
-        msg="Role Not Found",
-        desc="The requested role was not found.",
-        err_code="ROLE-404",
-    )
-
-
 class NoSearchableFieldsError(ApiException):
     """Raised when search is requested but no searchable fields are available."""
 
@@ -149,6 +102,57 @@ class NoSearchableFieldsError(ApiException):
         super().__init__(detail)
 
 
+class InvalidFacetFilterError(ApiException):
+    """Raised when filter_by contains a key not declared in facet_fields."""
+
+    api_error = ApiError(
+        code=400,
+        msg="Invalid Facet Filter",
+        desc="One or more filter_by keys are not declared as facet fields.",
+        err_code="FACET-400",
+    )
+
+    def __init__(self, key: str, valid_keys: set[str]) -> None:
+        """Initialize the exception.
+
+        Args:
+            key: The unknown filter key provided by the caller
+            valid_keys: Set of valid keys derived from the declared facet_fields
+        """
+        self.key = key
+        self.valid_keys = valid_keys
+        detail = (
+            f"'{key}' is not a declared facet field. "
+            f"Valid keys: {sorted(valid_keys) or 'none — set facet_fields on the CRUD class'}."
+        )
+        super().__init__(detail)
+
+
+class InvalidOrderFieldError(ApiException):
+    """Raised when order_by contains a field not in the allowed order fields."""
+
+    api_error = ApiError(
+        code=422,
+        msg="Invalid Order Field",
+        desc="The requested order field is not allowed for this resource.",
+        err_code="SORT-422",
+    )
+
+    def __init__(self, field: str, valid_fields: list[str]) -> None:
+        """Initialize the exception.
+
+        Args:
+            field: The unknown order field provided by the caller
+            valid_fields: List of valid field names
+        """
+        self.field = field
+        self.valid_fields = valid_fields
+        detail = (
+            f"'{field}' is not an allowed order field. Valid fields: {valid_fields}."
+        )
+        super().__init__(detail)
+
+
 def generate_error_responses(
     *errors: type[ApiException],
 ) -> dict[int | str, dict[str, Any]]:
@@ -163,6 +167,7 @@ def generate_error_responses(
         Dict suitable for FastAPI's responses parameter
 
     Example:
+        ```python
         from fastapi_toolsets.exceptions import generate_error_responses, UnauthorizedError, ForbiddenError
 
         @app.get(
@@ -171,6 +176,7 @@ def generate_error_responses(
         )
         async def admin_endpoint():
             ...
+        ```
     """
     responses: dict[int | str, dict[str, Any]] = {}
 

src/fastapi_toolsets/exceptions/handler.py

@@ -25,11 +25,13 @@ def init_exceptions_handlers(app: FastAPI) -> FastAPI:
         The same FastAPI instance (for chaining)
 
     Example:
+        ```python
         from fastapi import FastAPI
         from fastapi_toolsets.exceptions import init_exceptions_handlers
 
         app = FastAPI()
         init_exceptions_handlers(app)
+        ```
     """
     _register_exception_handlers(app)
     app.openapi = lambda: _custom_openapi(app)  # type: ignore[method-assign]

src/fastapi_toolsets/fixtures/registry.py

@@ -26,6 +26,7 @@ class FixtureRegistry:
     """Registry for managing fixtures with dependencies.
 
     Example:
+        ```python
         from fastapi_toolsets.fixtures import FixtureRegistry, Context
 
         fixtures = FixtureRegistry()
@@ -48,6 +49,7 @@ class FixtureRegistry:
             return [
                 Post(id=1, title="Test", user_id=1),
             ]
+        ```
     """
 
     def __init__(
@@ -80,6 +82,7 @@ class FixtureRegistry:
             contexts: List of contexts this fixture belongs to
 
         Example:
+            ```python
             @fixtures.register
             def roles():
                 return [Role(id=1, name="admin")]
@@ -87,6 +90,7 @@ class FixtureRegistry:
             @fixtures.register(depends_on=["roles"], contexts=[Context.TESTING])
             def test_users():
                 return [User(id=1, username="test", role_id=1)]
+            ```
         """
 
         def decorator(
@@ -124,6 +128,7 @@ class FixtureRegistry:
             ValueError: If a fixture name already exists in the current registry
 
         Example:
+            ```python
             registry = FixtureRegistry()
             dev_registry = FixtureRegistry()
 
@@ -132,6 +137,7 @@ class FixtureRegistry:
                 return [...]
 
             registry.include_registry(registry=dev_registry)
+            ```
         """
         for name, fixture in registry._fixtures.items():
             if name in self._fixtures:

src/fastapi_toolsets/fixtures/utils.py

@@ -59,9 +59,11 @@ async def load_fixtures(
         Dict mapping fixture names to loaded instances
 
     Example:
+        ```python
         # Loads 'roles' first (dependency), then 'users'
         result = await load_fixtures(session, fixtures, "users")
         print(result["users"])  # [User(...), ...]
+        ```
     """
     ordered = registry.resolve_dependencies(*names)
     return await _load_ordered(session, registry, ordered, strategy)
@@ -85,11 +87,13 @@ async def load_fixtures_by_context(
         Dict mapping fixture names to loaded instances
 
     Example:
+        ```python
         # Load base + testing fixtures
         await load_fixtures_by_context(
             session, fixtures,
             Context.BASE, Context.TESTING
         )
+        ```
     """
     ordered = registry.resolve_context_dependencies(*contexts)
     return await _load_ordered(session, registry, ordered, strategy)

src/fastapi_toolsets/logger.py

@@ -37,10 +37,12 @@ def configure_logging(
         The configured Logger instance.
 
     Example:
+        ```python
         from fastapi_toolsets.logger import configure_logging
 
         logger = configure_logging("DEBUG")
         logger.info("Application started")
+        ```
     """
     formatter = logging.Formatter(fmt)
 
@@ -83,11 +85,13 @@ def get_logger(name: str | None = _SENTINEL) -> logging.Logger:  # type: ignore[
         A Logger instance.
 
     Example:
+        ```python
         from fastapi_toolsets.logger import get_logger
 
         logger = get_logger()          # uses caller's __name__
         logger = get_logger("myapp")   # explicit name
         logger = get_logger(None)      # root logger
+        ```
     """
     if name is _SENTINEL:
         name = sys._getframe(1).f_globals.get("__name__")

src/fastapi_toolsets/metrics/__init__.py

@@ -0,0 +1,21 @@
+"""Prometheus metrics integration for FastAPI applications."""
+
+from typing import Any
+
+from .registry import Metric, MetricsRegistry
+
+try:
+    from .handler import init_metrics
+except ImportError:
+
+    def init_metrics(*_args: Any, **_kwargs: Any) -> None:
+        from .._imports import require_extra
+
+        require_extra(package="prometheus_client", extra="metrics")
+
+
+__all__ = [
+    "Metric",
+    "MetricsRegistry",
+    "init_metrics",
+]

src/fastapi_toolsets/metrics/handler.py

@@ -0,0 +1,75 @@
+"""Prometheus metrics endpoint for FastAPI applications."""
+
+import asyncio
+import os
+
+from fastapi import FastAPI
+from fastapi.responses import Response
+from prometheus_client import (
+    CONTENT_TYPE_LATEST,
+    CollectorRegistry,
+    generate_latest,
+    multiprocess,
+)
+
+from ..logger import get_logger
+from .registry import MetricsRegistry
+
+logger = get_logger()
+
+
+def _is_multiprocess() -> bool:
+    """Check if prometheus multi-process mode is enabled."""
+    return "PROMETHEUS_MULTIPROC_DIR" in os.environ
+
+
+def init_metrics(
+    app: FastAPI,
+    registry: MetricsRegistry,
+    *,
+    path: str = "/metrics",
+) -> FastAPI:
+    """Register a Prometheus ``/metrics`` endpoint on a FastAPI app.
+
+    Args:
+        app: FastAPI application instance.
+        registry: A :class:`MetricsRegistry` containing providers and collectors.
+        path: URL path for the metrics endpoint (default ``/metrics``).
+
+    Returns:
+        The same FastAPI instance (for chaining).
+
+    Example:
+        ```python
+        from fastapi import FastAPI
+        from fastapi_toolsets.metrics import MetricsRegistry, init_metrics
+
+        metrics = MetricsRegistry()
+        app = FastAPI()
+        init_metrics(app, registry=metrics)
+        ```
+    """
+    for provider in registry.get_providers():
+        logger.debug("Initialising metric provider '%s'", provider.name)
+        provider.func()
+
+    collectors = registry.get_collectors()
+
+    @app.get(path, include_in_schema=False)
+    async def metrics_endpoint() -> Response:
+        for collector in collectors:
+            if asyncio.iscoroutinefunction(collector.func):
+                await collector.func()
+            else:
+                collector.func()
+
+        if _is_multiprocess():
+            prom_registry = CollectorRegistry()
+            multiprocess.MultiProcessCollector(prom_registry)
+            output = generate_latest(prom_registry)
+        else:
+            output = generate_latest()
+
+        return Response(content=output, media_type=CONTENT_TYPE_LATEST)
+
+    return app

src/fastapi_toolsets/metrics/registry.py

@@ -0,0 +1,128 @@
+"""Metrics registry with decorator-based registration."""
+
+from collections.abc import Callable
+from dataclasses import dataclass, field
+from typing import Any, cast
+
+from ..logger import get_logger
+
+logger = get_logger()
+
+
+@dataclass
+class Metric:
+    """A metric definition with metadata."""
+
+    name: str
+    func: Callable[..., Any]
+    collect: bool = field(default=False)
+
+
+class MetricsRegistry:
+    """Registry for managing Prometheus metric providers and collectors.
+
+    Example:
+        ```python
+        from prometheus_client import Counter, Gauge
+        from fastapi_toolsets.metrics import MetricsRegistry
+
+        metrics = MetricsRegistry()
+
+        @metrics.register
+        def http_requests():
+            return Counter("http_requests_total", "Total HTTP requests", ["method", "status"])
+
+        @metrics.register(name="db_pool")
+        def database_pool_size():
+            return Gauge("db_pool_size", "Database connection pool size")
+
+        @metrics.register(collect=True)
+        def collect_queue_depth(gauge=Gauge("queue_depth", "Current queue depth")):
+            gauge.set(get_current_queue_depth())
+        ```
+    """
+
+    def __init__(self) -> None:
+        self._metrics: dict[str, Metric] = {}
+
+    def register(
+        self,
+        func: Callable[..., Any] | None = None,
+        *,
+        name: str | None = None,
+        collect: bool = False,
+    ) -> Callable[..., Any]:
+        """Register a metric provider or collector function.
+
+        Can be used as a decorator with or without arguments.
+
+        Args:
+            func: The metric function to register.
+            name: Metric name (defaults to function name).
+            collect: If ``True``, the function is called on every scrape.
+                If ``False`` (default), called once at init time.
+
+        Example:
+            ```python
+            @metrics.register
+            def my_counter():
+                return Counter("my_counter", "A counter")
+
+            @metrics.register(collect=True, name="queue")
+            def collect_queue_depth():
+                gauge.set(compute_depth())
+            ```
+        """
+
+        def decorator(fn: Callable[..., Any]) -> Callable[..., Any]:
+            metric_name = name or cast(Any, fn).__name__
+            self._metrics[metric_name] = Metric(
+                name=metric_name,
+                func=fn,
+                collect=collect,
+            )
+            return fn
+
+        if func is not None:
+            return decorator(func)
+        return decorator
+
+    def include_registry(self, registry: "MetricsRegistry") -> None:
+        """Include another :class:`MetricsRegistry` into this one.
+
+        Args:
+            registry: The registry to merge in.
+
+        Raises:
+            ValueError: If a metric name already exists in the current registry.
+
+        Example:
+            ```python
+            main = MetricsRegistry()
+            sub = MetricsRegistry()
+
+            @sub.register
+            def sub_metric():
+                return Counter("sub_total", "Sub counter")
+
+            main.include_registry(sub)
+            ```
+        """
+        for metric_name, definition in registry._metrics.items():
+            if metric_name in self._metrics:
+                raise ValueError(
+                    f"Metric '{metric_name}' already exists in the current registry"
+                )
+            self._metrics[metric_name] = definition
+
+    def get_all(self) -> list[Metric]:
+        """Get all registered metric definitions."""
+        return list(self._metrics.values())
+
+    def get_providers(self) -> list[Metric]:
+        """Get metric providers (called once at init)."""
+        return [m for m in self._metrics.values() if not m.collect]
+
+    def get_collectors(self) -> list[Metric]:
+        """Get collectors (called on each scrape)."""
+        return [m for m in self._metrics.values() if m.collect]

src/fastapi_toolsets/pytest/__init__.py

@@ -1,13 +1,24 @@
 """Pytest helpers for FastAPI testing: sessions, clients, and fixtures."""
 
-from .plugin import register_fixtures
+try:
-from .utils import (
+    from .plugin import register_fixtures
-    cleanup_tables,
+except ImportError:
-    create_async_client,
+    from .._imports import require_extra
-    create_db_session,
+
-    create_worker_database,
+    require_extra(package="pytest", extra="pytest")
-    worker_database_url,
+
-)
+try:
+    from .utils import (
+        cleanup_tables,
+        create_async_client,
+        create_db_session,
+        create_worker_database,
+        worker_database_url,
+    )
+except ImportError:
+    from .._imports import require_extra
+
+    require_extra(package="httpx", extra="pytest")
 
 __all__ = [
     "cleanup_tables",

src/fastapi_toolsets/pytest/plugin.py

@@ -1,55 +1,4 @@
-"""Pytest plugin for using FixtureRegistry fixtures in tests.
+"""Pytest plugin for using FixtureRegistry fixtures in tests."""
-
-This module provides utilities to automatically generate pytest fixtures
-from your FixtureRegistry, with proper dependency resolution.
-
-Example:
-    # conftest.py
-    import pytest
-    from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
-
-    from app.fixtures import fixtures  # Your FixtureRegistry
-    from app.models import Base
-    from fastapi_toolsets.pytest_plugin import register_fixtures
-
-    DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost:5432/test_db"
-
-    @pytest.fixture
-    async def engine():
-        engine = create_async_engine(DATABASE_URL)
-        yield engine
-        await engine.dispose()
-
-    @pytest.fixture
-    async def db_session(engine):
-        async with engine.begin() as conn:
-            await conn.run_sync(Base.metadata.create_all)
-
-        session_factory = async_sessionmaker(engine, expire_on_commit=False)
-        session = session_factory()
-
-        try:
-            yield session
-        finally:
-            await session.close()
-            async with engine.begin() as conn:
-                await conn.run_sync(Base.metadata.drop_all)
-
-    # Automatically generate pytest fixtures from registry
-    # Creates: fixture_roles, fixture_users, fixture_posts, etc.
-    register_fixtures(fixtures, globals())
-
-Usage in tests:
-    # test_users.py
-    async def test_user_count(db_session, fixture_users):
-        # fixture_users automatically loads fixture_roles first (if dependency)
-        # and returns the list of User models
-        assert len(fixture_users) > 0
-
-    async def test_user_role(db_session, fixture_users):
-        user = fixture_users[0]
-        assert user.role_id is not None
-"""
 
 from collections.abc import Callable, Sequence
 from typing import Any
@@ -86,6 +35,7 @@ def register_fixtures(
         List of created fixture names
 
     Example:
+        ```python
         # conftest.py
         from app.fixtures import fixtures
         from fastapi_toolsets.pytest_plugin import register_fixtures
@@ -96,6 +46,7 @@ def register_fixtures(
         # - fixture_roles
         # - fixture_users (depends on fixture_roles if users depends on roles)
         # - fixture_posts (depends on fixture_users if posts depends on users)
+        ```
     """
     created_fixtures: list[str] = []
 

src/fastapi_toolsets/pytest/utils.py

@@ -37,6 +37,7 @@ async def create_async_client(
         An AsyncClient configured for the app.
 
     Example:
+        ```python
         from fastapi import FastAPI
         from fastapi_toolsets.pytest import create_async_client
 
@@ -50,8 +51,10 @@ async def create_async_client(
         async def test_endpoint(client: AsyncClient):
             response = await client.get("/health")
             assert response.status_code == 200
+        ```
 
     Example with dependency overrides:
+        ```python
         from fastapi_toolsets.pytest import create_async_client, create_db_session
         from app.db import get_db
 
@@ -69,6 +72,7 @@ async def create_async_client(
                 app, dependency_overrides={get_db: override}
             ) as c:
                 yield c
+        ```
     """
     if dependency_overrides:
         app.dependency_overrides.update(dependency_overrides)
@@ -111,6 +115,7 @@ async def create_db_session(
         An AsyncSession ready for database operations.
 
     Example:
+        ```python
         from fastapi_toolsets.pytest import create_db_session
         from app.models import Base
 
@@ -127,6 +132,7 @@ async def create_db_session(
             user = User(name="test")
             db_session.add(user)
             await db_session.commit()
+        ```
     """
     engine = create_async_engine(database_url, echo=echo)
 
@@ -186,6 +192,7 @@ def worker_database_url(database_url: str, default_test_db: str) -> str:
         A database URL with a worker- or default-specific database name.
 
     Example:
+        ```python
         # With PYTEST_XDIST_WORKER="gw0":
         url = worker_database_url(
             "postgresql+asyncpg://user:pass@localhost/test_db",
@@ -199,6 +206,7 @@ def worker_database_url(database_url: str, default_test_db: str) -> str:
             default_test_db="test",
         )
         # "postgresql+asyncpg://user:pass@localhost/test_db_test"
+        ```
     """
     worker = _get_xdist_worker(default_test_db=default_test_db)
 
@@ -231,6 +239,7 @@ async def create_worker_database(
         The worker-specific database URL.
 
     Example:
+        ```python
         from fastapi_toolsets.pytest import (
             create_worker_database, create_db_session,
         )
@@ -248,6 +257,7 @@ async def create_worker_database(
                 worker_db_url, Base, cleanup=True
             ) as session:
                 yield session
+        ```
     """
     worker_url = worker_database_url(
         database_url=database_url, default_test_db=default_test_db
@@ -288,11 +298,13 @@ async def cleanup_tables(
         base: SQLAlchemy DeclarativeBase class containing model metadata.
 
     Example:
+        ```python
         @pytest.fixture
         async def db_session(worker_db_url):
             async with create_db_session(worker_db_url, Base) as session:
                 yield session
                 await cleanup_tables(session, Base)
+        ```
     """
     tables = base.metadata.sorted_tables
     if not tables:

src/fastapi_toolsets/schemas.py

@@ -7,7 +7,9 @@ from pydantic import BaseModel, ConfigDict
 
 __all__ = [
     "ApiError",
+    "CursorPagination",
     "ErrorResponse",
+    "OffsetPagination",
     "Pagination",
     "PaginatedResponse",
     "PydanticBase",
@@ -71,7 +73,9 @@ class Response(BaseResponse, Generic[DataT]):
     """Generic API response with data payload.
 
     Example:
+        ```python
         Response[UserRead](data=user, message="User retrieved")
+        ```
     """
 
     data: DataT | None = None
@@ -88,8 +92,8 @@ class ErrorResponse(BaseResponse):
     data: Any | None = None
 
 
-class Pagination(PydanticBase):
+class OffsetPagination(PydanticBase):
-    """Pagination metadata for list responses.
+    """Pagination metadata for offset-based list responses.
 
     Attributes:
         total_count: Total number of items across all pages
@@ -104,15 +108,29 @@ class Pagination(PydanticBase):
     has_more: bool
 
 
-class PaginatedResponse(BaseResponse, Generic[DataT]):
+# Backward-compatible - will be removed in v2.0
-    """Paginated API response for list endpoints.
+Pagination = OffsetPagination
 
-    Example:
+
-        PaginatedResponse[UserRead](
+class CursorPagination(PydanticBase):
-            data=users,
+    """Pagination metadata for cursor-based list responses.
-            pagination=Pagination(total_count=100, items_per_page=10, page=1, has_more=True)
+
-        )
+    Attributes:
+        next_cursor: Encoded cursor for the next page, or None on the last page.
+        prev_cursor: Encoded cursor for the previous page, or None on the first page.
+        items_per_page: Number of items requested per page.
+        has_more: Whether there is at least one more page after this one.
     """
 
+    next_cursor: str | None
+    prev_cursor: str | None = None
+    items_per_page: int
+    has_more: bool
+
+
+class PaginatedResponse(BaseResponse, Generic[DataT]):
+    """Paginated API response for list endpoints."""
+
     data: list[DataT]
-    pagination: Pagination
+    pagination: OffsetPagination | CursorPagination
+    filter_attributes: dict[str, list[Any]] | None = None

tests/conftest.py

@@ -5,24 +5,32 @@ import uuid
 
 import pytest
 from pydantic import BaseModel
-from sqlalchemy import ForeignKey, String, Uuid
+import datetime
+import decimal
+
+from sqlalchemy import (
+    Column,
+    Date,
+    DateTime,
+    ForeignKey,
+    Integer,
+    Numeric,
+    String,
+    Table,
+    Uuid,
+)
 from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
 from fastapi_toolsets.crud import CrudFactory
+from fastapi_toolsets.schemas import PydanticBase
 
-# PostgreSQL connection URL from environment or default for local development
+DATABASE_URL = os.getenv(
-DATABASE_URL = os.getenv("DATABASE_URL") or os.getenv(
+    key="DATABASE_URL",
-    "TEST_DATABASE_URL",
+    default="postgresql+asyncpg://postgres:postgres@localhost:5432/postgres",
-    "postgresql+asyncpg://postgres:postgres@localhost:5432/fastapi_toolsets_test",
 )
 
 
-# =============================================================================
-# Test Models
-# =============================================================================
-
-
 class Base(DeclarativeBase):
     """Base class for test models."""
 
@@ -56,6 +64,55 @@ class User(Base):
     role: Mapped[Role | None] = relationship(back_populates="users")
 
 
+class Tag(Base):
+    """Test tag model."""
+
+    __tablename__ = "tags"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(50), unique=True)
+
+
+post_tags = Table(
+    "post_tags",
+    Base.metadata,
+    Column(
+        "post_id", Uuid, ForeignKey("posts.id", ondelete="CASCADE"), primary_key=True
+    ),
+    Column("tag_id", Uuid, ForeignKey("tags.id", ondelete="CASCADE"), primary_key=True),
+)
+
+
+class IntRole(Base):
+    """Test role model with auto-increment integer PK."""
+
+    __tablename__ = "int_roles"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(String(50), unique=True)
+
+
+class Event(Base):
+    """Test model with DateTime and Date cursor columns."""
+
+    __tablename__ = "events"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(100))
+    occurred_at: Mapped[datetime.datetime] = mapped_column(DateTime)
+    scheduled_date: Mapped[datetime.date] = mapped_column(Date)
+
+
+class Product(Base):
+    """Test model with Numeric cursor column."""
+
+    __tablename__ = "products"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(100))
+    price: Mapped[decimal.Decimal] = mapped_column(Numeric(10, 2))
+
+
 class Post(Base):
     """Test post model."""
 
@@ -67,10 +124,7 @@ class Post(Base):
     is_published: Mapped[bool] = mapped_column(default=False)
     author_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"))
 
-
+    tags: Mapped[list[Tag]] = relationship(secondary=post_tags)
-# =============================================================================
-# Test Schemas
-# =============================================================================
 
 
 class RoleCreate(BaseModel):
@@ -80,6 +134,13 @@ class RoleCreate(BaseModel):
     name: str
 
 
+class RoleRead(PydanticBase):
+    """Schema for reading a role."""
+
+    id: uuid.UUID
+    name: str
+
+
 class RoleUpdate(BaseModel):
     """Schema for updating a role."""
 
@@ -96,6 +157,13 @@ class UserCreate(BaseModel):
     role_id: uuid.UUID | None = None
 
 
+class UserRead(PydanticBase):
+    """Schema for reading a user (subset of fields — no email)."""
+
+    id: uuid.UUID
+    username: str
+
+
 class UserUpdate(BaseModel):
     """Schema for updating a user."""
 
@@ -105,6 +173,13 @@ class UserUpdate(BaseModel):
     role_id: uuid.UUID | None = None
 
 
+class TagCreate(BaseModel):
+    """Schema for creating a tag."""
+
+    id: uuid.UUID | None = None
+    name: str
+
+
 class PostCreate(BaseModel):
     """Schema for creating a post."""
 
@@ -123,18 +198,60 @@ class PostUpdate(BaseModel):
     is_published: bool | None = None
 
 
-# =============================================================================
+class PostM2MCreate(BaseModel):
-# CRUD Classes
+    """Schema for creating a post with M2M tag IDs."""
-# =============================================================================
+
+    id: uuid.UUID | None = None
+    title: str
+    content: str = ""
+    is_published: bool = False
+    author_id: uuid.UUID
+    tag_ids: list[uuid.UUID] = []
+
+
+class PostM2MUpdate(BaseModel):
+    """Schema for updating a post with M2M tag IDs."""
+
+    title: str | None = None
+    content: str | None = None
+    is_published: bool | None = None
+    tag_ids: list[uuid.UUID] | None = None
+
+
+class IntRoleCreate(BaseModel):
+    """Schema for creating an IntRole."""
+
+    name: str
+
+
+class EventCreate(BaseModel):
+    """Schema for creating an Event."""
+
+    name: str
+    occurred_at: datetime.datetime
+    scheduled_date: datetime.date
+
+
+class ProductCreate(BaseModel):
+    """Schema for creating a Product."""
+
+    name: str
+    price: decimal.Decimal
+
 
 RoleCrud = CrudFactory(Role)
+RoleCursorCrud = CrudFactory(Role, cursor_column=Role.id)
+IntRoleCursorCrud = CrudFactory(IntRole, cursor_column=IntRole.id)
 UserCrud = CrudFactory(User)
+UserCursorCrud = CrudFactory(User, cursor_column=User.id)
 PostCrud = CrudFactory(Post)
-
+TagCrud = CrudFactory(Tag)
-
+PostM2MCrud = CrudFactory(Post, m2m_fields={"tag_ids": Post.tags})
-# =============================================================================
+EventCrud = CrudFactory(Event)
-# Fixtures
+EventDateTimeCursorCrud = CrudFactory(Event, cursor_column=Event.occurred_at)
-# =============================================================================
+EventDateCursorCrud = CrudFactory(Event, cursor_column=Event.scheduled_date)
+ProductCrud = CrudFactory(Product)
+ProductNumericCursorCrud = CrudFactory(Product, cursor_column=Product.price)
 
 
 @pytest.fixture

tests/test_crud_search.py

@@ -1,11 +1,20 @@
 """Tests for CRUD search functionality."""
 
+import inspect
 import uuid
 
 import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.sql.elements import ColumnElement, UnaryExpression
 
-from fastapi_toolsets.crud import SearchConfig, get_searchable_fields
+from fastapi_toolsets.crud import (
+    CrudFactory,
+    InvalidFacetFilterError,
+    SearchConfig,
+    get_searchable_fields,
+)
+from fastapi_toolsets.exceptions import InvalidOrderFieldError
+from fastapi_toolsets.schemas import OffsetPagination
 
 from .conftest import (
     Role,
@@ -39,6 +48,7 @@ class TestPaginateSearch:
             search_fields=[User.username],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
     @pytest.mark.anyio
@@ -57,6 +67,7 @@ class TestPaginateSearch:
             search_fields=[User.username, User.email],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
     @pytest.mark.anyio
@@ -84,6 +95,7 @@ class TestPaginateSearch:
             search_fields=[(User.role, Role.name)],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
     @pytest.mark.anyio
@@ -102,6 +114,7 @@ class TestPaginateSearch:
             search_fields=[User.username, (User.role, Role.name)],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
 
     @pytest.mark.anyio
@@ -117,6 +130,7 @@ class TestPaginateSearch:
             search_fields=[User.username],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
 
     @pytest.mark.anyio
@@ -132,6 +146,7 @@ class TestPaginateSearch:
             search=SearchConfig(query="johndoe", case_sensitive=True),
             search_fields=[User.username],
         )
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 0
 
         # Should find (case match)
@@ -140,6 +155,7 @@ class TestPaginateSearch:
             search=SearchConfig(query="JohnDoe", case_sensitive=True),
             search_fields=[User.username],
         )
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
 
     @pytest.mark.anyio
@@ -153,9 +169,11 @@ class TestPaginateSearch:
         )
 
         result = await UserCrud.paginate(db_session, search="")
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
         result = await UserCrud.paginate(db_session, search=None)
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
     @pytest.mark.anyio
@@ -177,6 +195,7 @@ class TestPaginateSearch:
             search_fields=[User.username],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
         assert result.data[0].username == "active_john"
 
@@ -189,6 +208,7 @@ class TestPaginateSearch:
 
         result = await UserCrud.paginate(db_session, search="findme")
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
 
     @pytest.mark.anyio
@@ -204,6 +224,7 @@ class TestPaginateSearch:
             search_fields=[User.username],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 0
         assert result.data == []
 
@@ -224,6 +245,7 @@ class TestPaginateSearch:
             items_per_page=5,
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 15
         assert len(result.data) == 5
         assert result.pagination.has_more is True
@@ -248,6 +270,7 @@ class TestPaginateSearch:
             search_fields=[User.username],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
     @pytest.mark.anyio
@@ -270,6 +293,7 @@ class TestPaginateSearch:
             order_by=User.username,
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 3
         usernames = [u.username for u in result.data]
         assert usernames == ["alice", "bob", "charlie"]
@@ -292,13 +316,40 @@ class TestPaginateSearch:
             search_fields=[User.id, User.username],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
         assert result.data[0].id == user_id
 
 
+class TestBuildSearchFilters:
+    """Unit tests for build_search_filters."""
+
+    def test_deduplicates_relationship_join(self):
+        """Two tuple fields sharing the same relationship do not add the join twice."""
+        from fastapi_toolsets.crud.search import build_search_filters
+
+        # Both fields traverse User.role — the second must not re-add the join.
+        filters, joins = build_search_filters(
+            User,
+            "admin",
+            search_fields=[(User.role, Role.name), (User.role, Role.id)],
+        )
+
+        assert len(joins) == 1
+
+
 class TestSearchConfig:
     """Tests for SearchConfig options."""
 
+    def test_search_config_empty_query_returns_empty(self):
+        """SearchConfig with an empty/blank query returns empty filters without hitting the DB."""
+        from fastapi_toolsets.crud.search import build_search_filters
+
+        filters, joins = build_search_filters(User, SearchConfig(query="   "))
+
+        assert filters == []
+        assert joins == []
+
     @pytest.mark.anyio
     async def test_match_mode_all(self, db_session: AsyncSession):
         """match_mode='all' requires all fields to match (AND)."""
@@ -318,6 +369,7 @@ class TestSearchConfig:
             search_fields=[User.username, User.email],
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
         assert result.data[0].username == "john_test"
 
@@ -333,6 +385,7 @@ class TestSearchConfig:
             search=SearchConfig(query="findme", fields=[User.email]),
         )
 
+        assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
 
 
@@ -413,3 +466,695 @@ class TestGetSearchableFields:
         # Role.users is a collection, should not be included
         field_strs = [str(f) for f in fields]
         assert not any("users" in f for f in field_strs)
+
+
+class TestFacetsNotSet:
+    """filter_attributes is None when no facet_fields are configured."""
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_no_facets(self, db_session: AsyncSession):
+        """filter_attributes is None when facet_fields not set on factory or call."""
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        result = await UserCrud.offset_paginate(db_session)
+
+        assert result.filter_attributes is None
+
+    @pytest.mark.anyio
+    async def test_cursor_paginate_no_facets(self, db_session: AsyncSession):
+        """filter_attributes is None for cursor_paginate when facet_fields not set."""
+        UserCursorCrud = CrudFactory(User, cursor_column=User.id)
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        result = await UserCursorCrud.cursor_paginate(db_session)
+
+        assert result.filter_attributes is None
+
+
+class TestFacetsDirectColumn:
+    """Facets on direct model columns."""
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_direct_column(self, db_session: AsyncSession):
+        """Returns distinct values for a direct column via factory default."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(db_session)
+
+        assert result.filter_attributes is not None
+        # Distinct usernames, sorted
+        assert result.filter_attributes["username"] == ["alice", "bob"]
+
+    @pytest.mark.anyio
+    async def test_cursor_paginate_direct_column(self, db_session: AsyncSession):
+        """Returns distinct values for a direct column in cursor_paginate."""
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.email]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCursorCrud.cursor_paginate(db_session)
+
+        assert result.filter_attributes is not None
+        assert set(result.filter_attributes["email"]) == {"a@test.com", "b@test.com"}
+
+    @pytest.mark.anyio
+    async def test_multiple_facet_columns(self, db_session: AsyncSession):
+        """Returns distinct values for multiple columns."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(db_session)
+
+        assert result.filter_attributes is not None
+        assert "username" in result.filter_attributes
+        assert "email" in result.filter_attributes
+        assert set(result.filter_attributes["username"]) == {"alice", "bob"}
+
+    @pytest.mark.anyio
+    async def test_per_call_override(self, db_session: AsyncSession):
+        """Per-call facet_fields overrides the factory default."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        # Override: ask for email instead of username
+        result = await UserFacetCrud.offset_paginate(
+            db_session, facet_fields=[User.email]
+        )
+
+        assert result.filter_attributes is not None
+        assert "email" in result.filter_attributes
+        assert "username" not in result.filter_attributes
+
+
+class TestFacetsRespectFilters:
+    """Facets reflect the active filter conditions."""
+
+    @pytest.mark.anyio
+    async def test_facets_respect_base_filters(self, db_session: AsyncSession):
+        """Facet values are scoped to the applied filters."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com", is_active=True)
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com", is_active=False)
+        )
+
+        # Filter to active users only — facets should only see "alice"
+        result = await UserFacetCrud.offset_paginate(
+            db_session,
+            filters=[User.is_active == True],  # noqa: E712
+        )
+
+        assert result.filter_attributes is not None
+        assert result.filter_attributes["username"] == ["alice"]
+
+
+class TestFacetsRelationship:
+    """Facets on relationship columns via tuple syntax."""
+
+    @pytest.mark.anyio
+    async def test_relationship_facet(self, db_session: AsyncSession):
+        """Returns distinct values from a related model column."""
+        UserRelFacetCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        editor = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="bob", email="b@test.com", role_id=editor.id),
+        )
+        # User without a role — their role.name should be excluded (None filtered out)
+        await UserCrud.create(
+            db_session, UserCreate(username="charlie", email="c@test.com")
+        )
+
+        result = await UserRelFacetCrud.offset_paginate(db_session)
+
+        assert result.filter_attributes is not None
+        assert set(result.filter_attributes["name"]) == {"admin", "editor"}
+
+    @pytest.mark.anyio
+    async def test_relationship_facet_none_excluded(self, db_session: AsyncSession):
+        """None values (e.g. NULL role) are excluded from facet results."""
+        UserRelFacetCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+
+        # Only user with no role
+        await UserCrud.create(
+            db_session, UserCreate(username="norole", email="n@test.com")
+        )
+
+        result = await UserRelFacetCrud.offset_paginate(db_session)
+
+        assert result.filter_attributes is not None
+        assert result.filter_attributes["name"] == []
+
+    @pytest.mark.anyio
+    async def test_relationship_facet_deduplicates_join_with_search(
+        self, db_session: AsyncSession
+    ):
+        """Facet join is not duplicated when search already added the same relationship join."""
+        # Both search and facet use (User.role, Role.name) — join should not be doubled
+        UserSearchFacetCrud = CrudFactory(
+            User,
+            searchable_fields=[(User.role, Role.name)],
+            facet_fields=[(User.role, Role.name)],
+        )
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+
+        result = await UserSearchFacetCrud.offset_paginate(
+            db_session, search="admin", search_fields=[(User.role, Role.name)]
+        )
+
+        assert result.filter_attributes is not None
+        assert result.filter_attributes["name"] == ["admin"]
+
+
+class TestFilterBy:
+    """Tests for the filter_by parameter on offset_paginate and cursor_paginate."""
+
+    @pytest.mark.anyio
+    async def test_scalar_filter(self, db_session: AsyncSession):
+        """filter_by with a scalar value produces an equality filter."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by={"username": "alice"}
+        )
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+        # facet also scoped to the filter
+        assert result.filter_attributes == {"username": ["alice"]}
+
+    @pytest.mark.anyio
+    async def test_list_filter_produces_in_clause(self, db_session: AsyncSession):
+        """filter_by with a list value produces an IN filter."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="charlie", email="c@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by={"username": ["alice", "bob"]}
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 2
+        returned_names = {u.username for u in result.data}
+        assert returned_names == {"alice", "bob"}
+
+    @pytest.mark.anyio
+    async def test_relationship_filter_by(self, db_session: AsyncSession):
+        """filter_by works with relationship tuple facet fields."""
+        UserRelFacetCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        editor = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="bob", email="b@test.com", role_id=editor.id),
+        )
+
+        result = await UserRelFacetCrud.offset_paginate(
+            db_session, filter_by={"name": "admin"}
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_filter_by_combined_with_filters(self, db_session: AsyncSession):
+        """filter_by and filters= are combined (AND logic)."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com", is_active=True)
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice2", email="a2@test.com", is_active=False),
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session,
+            filters=[User.is_active == True],  # noqa: E712
+            filter_by={"username": ["alice", "alice2"]},
+        )
+
+        # Only alice passes both: is_active=True AND username IN [alice, alice2]
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_invalid_key_raises(self, db_session: AsyncSession):
+        """filter_by with an undeclared key raises InvalidFacetFilterError."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+
+        with pytest.raises(InvalidFacetFilterError) as exc_info:
+            await UserFacetCrud.offset_paginate(
+                db_session, filter_by={"nonexistent": "value"}
+            )
+
+        assert exc_info.value.key == "nonexistent"
+        assert "username" in exc_info.value.valid_keys
+
+    @pytest.mark.anyio
+    async def test_filter_by_deduplicates_relationship_join(
+        self, db_session: AsyncSession
+    ):
+        """Two filter_by keys through the same relationship do not duplicate the join."""
+        # Both (User.role, Role.name) and (User.role, Role.id) traverse User.role —
+        # the second key must not re-add the join (exercises the dedup branch in build_filter_by).
+        UserRoleFacetCrud = CrudFactory(
+            User,
+            facet_fields=[(User.role, Role.name), (User.role, Role.id)],
+        )
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        editor = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="bob", email="b@test.com", role_id=editor.id),
+        )
+
+        result = await UserRoleFacetCrud.offset_paginate(
+            db_session,
+            filter_by={"name": "admin", "id": str(admin.id)},
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_cursor_paginate_filter_by(self, db_session: AsyncSession):
+        """filter_by works with cursor_paginate."""
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.username]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCursorCrud.cursor_paginate(
+            db_session, filter_by={"username": "alice"}
+        )
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+        assert result.filter_attributes == {"username": ["alice"]}
+
+    @pytest.mark.anyio
+    async def test_basemodel_filter_by_offset_paginate(self, db_session: AsyncSession):
+        """filter_by accepts a BaseModel instance (model_dump path) in offset_paginate."""
+        from pydantic import BaseModel as PydanticBaseModel
+
+        class UserFilter(PydanticBaseModel):
+            username: str | None = None
+
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by=UserFilter(username="alice")
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_basemodel_filter_by_cursor_paginate(self, db_session: AsyncSession):
+        """filter_by accepts a BaseModel instance (model_dump path) in cursor_paginate."""
+        from pydantic import BaseModel as PydanticBaseModel
+
+        class UserFilter(PydanticBaseModel):
+            username: str | None = None
+
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.username]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCursorCrud.cursor_paginate(
+            db_session, filter_by=UserFilter(username="alice")
+        )
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+
+
+class TestFilterParamsSchema:
+    """Tests for AsyncCrud.filter_params()."""
+
+    def test_generates_fields_from_facet_fields(self):
+        """Returned dependency has one keyword param per facet field."""
+        import inspect
+
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        dep = UserFacetCrud.filter_params()
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"username", "email"}
+
+    def test_relationship_facet_uses_column_key(self):
+        """Relationship tuple uses the terminal column's key."""
+        import inspect
+
+        UserRoleCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+        dep = UserRoleCrud.filter_params()
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"name"}
+
+    def test_raises_when_no_facet_fields(self):
+        """ValueError raised when no facet_fields are configured or provided."""
+        with pytest.raises(ValueError, match="no facet_fields"):
+            UserCrud.filter_params()
+
+    def test_facet_fields_override(self):
+        """facet_fields= parameter overrides the class-level default."""
+        import inspect
+
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        dep = UserFacetCrud.filter_params(facet_fields=[User.email])
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"email"}
+
+    @pytest.mark.anyio
+    async def test_awaiting_dep_returns_dict_with_values(self):
+        """Awaiting the dependency returns a dict with only the supplied keys."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        dep = UserFacetCrud.filter_params()
+
+        result = await dep(username=["alice"])
+        assert result == {"username": ["alice"]}
+
+    @pytest.mark.anyio
+    async def test_multi_value_list_field(self):
+        """Multiple values are accepted as a list."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        dep = UserFacetCrud.filter_params()
+
+        result = await dep(username=["alice", "bob"])
+        assert result == {"username": ["alice", "bob"]}
+
+    def test_disambiguates_duplicate_column_keys(self):
+        """Two relationship tuples sharing a terminal column key get prefixed names."""
+        from unittest.mock import MagicMock
+
+        from fastapi_toolsets.crud.search import facet_keys
+
+        col_a = MagicMock()
+        col_a.key = "name"
+        rel_a = MagicMock()
+        rel_a.key = "project"
+
+        col_b = MagicMock()
+        col_b.key = "name"
+        rel_b = MagicMock()
+        rel_b.key = "os"
+
+        keys = facet_keys([(rel_a, col_a), (rel_b, col_b)])
+        assert keys == ["project__name", "os__name"]
+
+    def test_unique_column_keys_kept_plain(self):
+        """Fields with unique column keys are not prefixed."""
+        from fastapi_toolsets.crud.search import facet_keys
+
+        keys = facet_keys([User.username, User.email])
+        assert keys == ["username", "email"]
+
+    def test_dependency_name_includes_model_name(self):
+        """Returned dependency is named {Model}FilterParams."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        dep = UserFacetCrud.filter_params()
+
+        assert dep.__name__ == "UserFilterParams"  # type: ignore[union-attr]
+
+    @pytest.mark.anyio
+    async def test_integration_with_offset_paginate(self, db_session: AsyncSession):
+        """Dependency result can be passed directly to offset_paginate via filter_by."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        dep = UserFacetCrud.filter_params()
+        f = await dep(username=["alice"])
+        result = await UserFacetCrud.offset_paginate(db_session, filter_by=f)
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_dep_result_passed_to_cursor_paginate(self, db_session: AsyncSession):
+        """Dependency result can be passed directly to cursor_paginate via filter_by."""
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.username]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        dep = UserFacetCursorCrud.filter_params()
+        f = await dep(username=["alice"])
+        result = await UserFacetCursorCrud.cursor_paginate(db_session, filter_by=f)
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_all_none_dep_result_passes_no_filter(self, db_session: AsyncSession):
+        """All-None dependency result results in no filter (returns all rows)."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        dep = UserFacetCrud.filter_params()
+        f = await dep()  # all fields None
+        result = await UserFacetCrud.offset_paginate(db_session, filter_by=f)
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 2
+
+
+class TestOrderParamsSchema:
+    """Tests for AsyncCrud.order_params()."""
+
+    def test_generates_order_by_and_order_params(self):
+        """Returned dependency has order_by and order query params."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params()
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"order_by", "order"}
+
+    def test_dependency_name_includes_model_name(self):
+        """Dependency function is named after the model."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        assert getattr(dep, "__name__") == "UserOrderParams"
+
+    def test_raises_when_no_order_fields(self):
+        """ValueError raised when no order_fields are configured or provided."""
+        with pytest.raises(ValueError, match="no order_fields"):
+            UserCrud.order_params()
+
+    def test_order_fields_override(self):
+        """order_fields= parameter overrides the class-level default."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params(order_fields=[User.email])
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert "order_by" in param_names
+        # description should only mention email, not username
+        sig = inspect.signature(dep)
+        description = sig.parameters["order_by"].default.description
+        assert "email" in description
+        assert "username" not in description
+
+    def test_order_by_description_lists_valid_fields(self):
+        """order_by query param description mentions each allowed field."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params()
+
+        sig = inspect.signature(dep)
+        description = sig.parameters["order_by"].default.description
+        assert "username" in description
+        assert "email" in description
+
+    def test_default_order_reflected_in_order_default(self):
+        """default_order is used as the default value for order."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep_asc = UserOrderCrud.order_params(default_order="asc")
+        dep_desc = UserOrderCrud.order_params(default_order="desc")
+
+        sig_asc = inspect.signature(dep_asc)
+        sig_desc = inspect.signature(dep_desc)
+        assert sig_asc.parameters["order"].default.default == "asc"
+        assert sig_desc.parameters["order"].default.default == "desc"
+
+    @pytest.mark.anyio
+    async def test_no_order_by_no_default_returns_none(self):
+        """Returns None when order_by is absent and no default_field is set."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        result = await dep(order_by=None, order="asc")
+        assert result is None
+
+    @pytest.mark.anyio
+    async def test_no_order_by_with_default_field_returns_asc_expression(self):
+        """Returns default_field.asc() when order_by absent and order=asc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params(default_field=User.username)
+        result = await dep(order_by=None, order="asc")
+        assert isinstance(result, UnaryExpression)
+        assert "ASC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_no_order_by_with_default_field_returns_desc_expression(self):
+        """Returns default_field.desc() when order_by absent and order=desc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params(default_field=User.username)
+        result = await dep(order_by=None, order="desc")
+        assert isinstance(result, UnaryExpression)
+        assert "DESC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_valid_order_by_asc(self):
+        """Returns field.asc() for a valid order_by with order=asc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        result = await dep(order_by="username", order="asc")
+        assert isinstance(result, UnaryExpression)
+        assert "ASC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_valid_order_by_desc(self):
+        """Returns field.desc() for a valid order_by with order=desc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        result = await dep(order_by="username", order="desc")
+        assert isinstance(result, UnaryExpression)
+        assert "DESC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_invalid_order_by_raises_invalid_order_field_error(self):
+        """Raises InvalidOrderFieldError for an unknown order_by value."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        with pytest.raises(InvalidOrderFieldError) as exc_info:
+            await dep(order_by="nonexistent", order="asc")
+        assert exc_info.value.field == "nonexistent"
+        assert "username" in exc_info.value.valid_fields
+
+    @pytest.mark.anyio
+    async def test_multiple_fields_all_resolve(self):
+        """All configured fields resolve correctly via order_by."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params()
+        result_username = await dep(order_by="username", order="asc")
+        result_email = await dep(order_by="email", order="desc")
+        assert isinstance(result_username, ColumnElement)
+        assert isinstance(result_email, ColumnElement)
+
+    @pytest.mark.anyio
+    async def test_order_params_integrates_with_get_multi(
+        self, db_session: AsyncSession
+    ):
+        """order_params output is accepted by get_multi(order_by=...)."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="charlie", email="c@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        dep = UserOrderCrud.order_params()
+        order_by = await dep(order_by="username", order="asc")
+        results = await UserOrderCrud.get_multi(db_session, order_by=order_by)
+
+        assert results[0].username == "alice"
+        assert results[1].username == "charlie"

tests/test_example_pagination_search.py

@@ -0,0 +1,395 @@
+"""Live test for the docs/examples/pagination-search.md example.
+
+Spins up the exact FastAPI app described in the example (sourced from
+docs_src/examples/pagination_search/) and exercises it through a real HTTP
+client against a real PostgreSQL database.
+"""
+
+import datetime
+
+import pytest
+from fastapi import FastAPI
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from docs_src.examples.pagination_search.db import get_db
+from docs_src.examples.pagination_search.models import Article, Base, Category
+from docs_src.examples.pagination_search.routes import router
+from fastapi_toolsets.exceptions import init_exceptions_handlers
+
+from .conftest import DATABASE_URL
+
+
+def build_app(session: AsyncSession) -> FastAPI:
+    app = FastAPI()
+    init_exceptions_handlers(app)
+
+    async def override_get_db():
+        yield session
+
+    app.dependency_overrides[get_db] = override_get_db
+    app.include_router(router)
+    return app
+
+
+@pytest.fixture(scope="function")
+async def ex_db_session():
+    """Isolated session for the example models (separate tables from conftest)."""
+    engine = create_async_engine(DATABASE_URL, echo=False)
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+    session_factory = async_sessionmaker(engine, expire_on_commit=False)
+    session = session_factory()
+
+    try:
+        yield session
+    finally:
+        await session.close()
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.drop_all)
+        await engine.dispose()
+
+
+@pytest.fixture
+async def client(ex_db_session: AsyncSession):
+    app = build_app(ex_db_session)
+    async with AsyncClient(
+        transport=ASGITransport(app=app), base_url="http://test"
+    ) as ac:
+        yield ac
+
+
+async def seed(session: AsyncSession):
+    """Insert representative fixture data."""
+    python = Category(name="python")
+    backend = Category(name="backend")
+    session.add_all([python, backend])
+    await session.flush()
+
+    now = datetime.datetime(2024, 1, 1, tzinfo=datetime.timezone.utc)
+    session.add_all(
+        [
+            Article(
+                title="FastAPI tips",
+                body="Ten useful tips for FastAPI.",
+                status="published",
+                published=True,
+                category_id=python.id,
+                created_at=now,
+            ),
+            Article(
+                title="SQLAlchemy async",
+                body="How to use async SQLAlchemy.",
+                status="published",
+                published=True,
+                category_id=backend.id,
+                created_at=now + datetime.timedelta(seconds=1),
+            ),
+            Article(
+                title="Draft notes",
+                body="Work in progress.",
+                status="draft",
+                published=False,
+                category_id=None,
+                created_at=now + datetime.timedelta(seconds=2),
+            ),
+        ]
+    )
+    await session.commit()
+
+
+class TestAppSessionDep:
+    @pytest.mark.anyio
+    async def test_get_db_yields_async_session(self):
+        """get_db yields a real AsyncSession when called directly."""
+        from docs_src.examples.pagination_search.db import get_db
+
+        gen = get_db()
+        session = await gen.__anext__()
+        assert isinstance(session, AsyncSession)
+        await session.close()
+
+
+class TestOffsetPagination:
+    @pytest.mark.anyio
+    async def test_returns_all_articles(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 3
+        assert len(body["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_pagination_page_size(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?items_per_page=2&page=1")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 2
+        assert body["pagination"]["total_count"] == 3
+        assert body["pagination"]["has_more"] is True
+
+    @pytest.mark.anyio
+    async def test_full_text_search(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?search=fastapi")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 1
+        assert body["data"][0]["title"] == "FastAPI tips"
+
+    @pytest.mark.anyio
+    async def test_search_traverses_relationship(
+        self, client: AsyncClient, ex_db_session
+    ):
+        await seed(ex_db_session)
+
+        # "python" matches Category.name, not Article.title or body
+        resp = await client.get("/articles/offset?search=python")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 1
+        assert body["data"][0]["title"] == "FastAPI tips"
+
+    @pytest.mark.anyio
+    async def test_facet_filter_scalar(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?status=published")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 2
+        assert all(a["status"] == "published" for a in body["data"])
+
+    @pytest.mark.anyio
+    async def test_facet_filter_multi_value(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?status=published&status=draft")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 3
+
+    @pytest.mark.anyio
+    async def test_filter_attributes_in_response(
+        self, client: AsyncClient, ex_db_session
+    ):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        fa = body["filter_attributes"]
+        assert set(fa["status"]) == {"draft", "published"}
+        # "name" is unique across all facet fields — no prefix needed
+        assert set(fa["name"]) == {"backend", "python"}
+
+    @pytest.mark.anyio
+    async def test_filter_attributes_scoped_to_filter(
+        self, client: AsyncClient, ex_db_session
+    ):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?status=published")
+
+        body = resp.json()
+        # draft is filtered out → should not appear in filter_attributes
+        assert "draft" not in body["filter_attributes"]["status"]
+
+    @pytest.mark.anyio
+    async def test_search_and_filter_combined(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?search=async&status=published")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 1
+        assert body["data"][0]["title"] == "SQLAlchemy async"
+
+
+class TestCursorPagination:
+    @pytest.mark.anyio
+    async def test_first_page(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?items_per_page=2")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 2
+        assert body["pagination"]["has_more"] is True
+        assert body["pagination"]["next_cursor"] is not None
+        assert body["pagination"]["prev_cursor"] is None
+
+    @pytest.mark.anyio
+    async def test_second_page(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        first = await client.get("/articles/cursor?items_per_page=2")
+        next_cursor = first.json()["pagination"]["next_cursor"]
+
+        resp = await client.get(
+            f"/articles/cursor?items_per_page=2&cursor={next_cursor}"
+        )
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 1
+        assert body["pagination"]["has_more"] is False
+
+    @pytest.mark.anyio
+    async def test_facet_filter(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?status=draft")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 1
+        assert body["data"][0]["status"] == "draft"
+
+    @pytest.mark.anyio
+    async def test_full_text_search(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?search=sqlalchemy")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 1
+        assert body["data"][0]["title"] == "SQLAlchemy async"
+
+
+class TestOffsetSorting:
+    """Tests for order_by / order query parameters on the offset endpoint."""
+
+    @pytest.mark.anyio
+    async def test_default_order_uses_created_at_asc(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """No order_by → default field (created_at) ASC."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["FastAPI tips", "SQLAlchemy async", "Draft notes"]
+
+    @pytest.mark.anyio
+    async def test_order_by_title_asc(self, client: AsyncClient, ex_db_session):
+        """order_by=title&order=asc returns alphabetical order."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?order_by=title&order=asc")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["Draft notes", "FastAPI tips", "SQLAlchemy async"]
+
+    @pytest.mark.anyio
+    async def test_order_by_title_desc(self, client: AsyncClient, ex_db_session):
+        """order_by=title&order=desc returns reverse alphabetical order."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?order_by=title&order=desc")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["SQLAlchemy async", "FastAPI tips", "Draft notes"]
+
+    @pytest.mark.anyio
+    async def test_order_by_created_at_desc(self, client: AsyncClient, ex_db_session):
+        """order_by=created_at&order=desc returns newest-first."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?order_by=created_at&order=desc")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["Draft notes", "SQLAlchemy async", "FastAPI tips"]
+
+    @pytest.mark.anyio
+    async def test_invalid_order_by_returns_422(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Unknown order_by field returns 422 with SORT-422 error code."""
+        resp = await client.get("/articles/offset?order_by=nonexistent_field")
+
+        assert resp.status_code == 422
+        body = resp.json()
+        assert body["error_code"] == "SORT-422"
+        assert body["status"] == "FAIL"
+
+
+class TestCursorSorting:
+    """Tests for order_by / order query parameters on the cursor endpoint.
+
+    In cursor_paginate the cursor_column is always the primary sort; order_by
+    acts as a secondary tiebreaker. With the seeded articles (all having unique
+    created_at values) the overall ordering is always created_at ASC regardless
+    of the order_by value — only the valid/invalid field check and the response
+    shape are meaningful here.
+    """
+
+    @pytest.mark.anyio
+    async def test_default_order_uses_created_at_asc(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """No order_by → default field (created_at) ASC."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["FastAPI tips", "SQLAlchemy async", "Draft notes"]
+
+    @pytest.mark.anyio
+    async def test_order_by_title_asc_accepted(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """order_by=title is a valid field — request succeeds and returns all articles."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?order_by=title&order=asc")
+
+        assert resp.status_code == 200
+        assert len(resp.json()["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_order_by_title_desc_accepted(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """order_by=title&order=desc is valid — request succeeds and returns all articles."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?order_by=title&order=desc")
+
+        assert resp.status_code == 200
+        assert len(resp.json()["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_invalid_order_by_returns_422(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Unknown order_by field returns 422 with SORT-422 error code."""
+        resp = await client.get("/articles/cursor?order_by=nonexistent_field")
+
+        assert resp.status_code == 422
+        body = resp.json()
+        assert body["error_code"] == "SORT-422"
+        assert body["status"] == "FAIL"

tests/test_exceptions.py

@@ -8,6 +8,7 @@ from fastapi_toolsets.exceptions import (
     ApiException,
     ConflictError,
     ForbiddenError,
+    InvalidOrderFieldError,
     NotFoundError,
     UnauthorizedError,
     generate_error_responses,
@@ -334,3 +335,43 @@ class TestExceptionIntegration:
 
         assert response.status_code == 200
         assert response.json() == {"id": 1}
+
+
+class TestInvalidOrderFieldError:
+    """Tests for InvalidOrderFieldError exception."""
+
+    def test_api_error_attributes(self):
+        """InvalidOrderFieldError has correct api_error metadata."""
+        assert InvalidOrderFieldError.api_error.code == 422
+        assert InvalidOrderFieldError.api_error.err_code == "SORT-422"
+        assert InvalidOrderFieldError.api_error.msg == "Invalid Order Field"
+
+    def test_stores_field_and_valid_fields(self):
+        """InvalidOrderFieldError stores field and valid_fields on the instance."""
+        error = InvalidOrderFieldError("unknown", ["name", "created_at"])
+        assert error.field == "unknown"
+        assert error.valid_fields == ["name", "created_at"]
+
+    def test_message_contains_field_and_valid_fields(self):
+        """Exception message mentions the bad field and valid options."""
+        error = InvalidOrderFieldError("bad_field", ["name", "email"])
+        assert "bad_field" in str(error)
+        assert "name" in str(error)
+        assert "email" in str(error)
+
+    def test_handled_as_422_by_exception_handler(self):
+        """init_exceptions_handlers turns InvalidOrderFieldError into a 422 response."""
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/items")
+        async def list_items():
+            raise InvalidOrderFieldError("bad", ["name"])
+
+        client = TestClient(app)
+        response = client.get("/items")
+
+        assert response.status_code == 422
+        data = response.json()
+        assert data["error_code"] == "SORT-422"
+        assert data["status"] == "FAIL"

tests/test_imports.py

@@ -0,0 +1,229 @@
+"""Tests for optional dependency import guards."""
+
+import importlib
+import sys
+from unittest.mock import patch
+
+import pytest
+
+from fastapi_toolsets._imports import require_extra
+
+
+class TestRequireExtra:
+    """Tests for the require_extra helper."""
+
+    def test_raises_import_error(self):
+        """require_extra raises ImportError."""
+        with pytest.raises(ImportError):
+            require_extra(package="some_pkg", extra="some_extra")
+
+    def test_error_message_contains_package_name(self):
+        """Error message mentions the missing package."""
+        with pytest.raises(ImportError, match="'prometheus_client'"):
+            require_extra(package="prometheus_client", extra="metrics")
+
+    def test_error_message_contains_install_instruction(self):
+        """Error message contains the pip install command."""
+        with pytest.raises(
+            ImportError, match=r"pip install fastapi-toolsets\[metrics\]"
+        ):
+            require_extra(package="prometheus_client", extra="metrics")
+
+
+def _reload_without_package(module_path: str, blocked_packages: list[str]):
+    """Reload a module while blocking specific package imports.
+
+    Removes the target module and its parents from sys.modules so they
+    get re-imported, and patches builtins.__import__ to raise ImportError
+    for *blocked_packages*.
+    """
+    # Remove cached modules so they get re-imported
+    to_remove = [
+        key
+        for key in sys.modules
+        if key == module_path or key.startswith(module_path + ".")
+    ]
+    saved = {}
+    for key in to_remove:
+        saved[key] = sys.modules.pop(key)
+
+    # Also remove parent package to force re-execution of __init__.py
+    parts = module_path.rsplit(".", 1)
+    if len(parts) == 2:
+        parent = parts[0]
+        parent_keys = [
+            key for key in sys.modules if key == parent or key.startswith(parent + ".")
+        ]
+        for key in parent_keys:
+            if key not in saved:
+                saved[key] = sys.modules.pop(key)
+
+    original_import = (
+        __builtins__.__import__ if hasattr(__builtins__, "__import__") else __import__
+    )
+
+    def blocking_import(name, *args, **kwargs):
+        for blocked in blocked_packages:
+            if name == blocked or name.startswith(blocked + "."):
+                raise ImportError(f"Mocked: No module named '{name}'")
+        return original_import(name, *args, **kwargs)
+
+    return saved, blocking_import
+
+
+class TestMetricsImportGuard:
+    """Tests for metrics module import guard when prometheus_client is missing."""
+
+    def test_registry_imports_without_prometheus(self):
+        """Metric and MetricsRegistry are importable without prometheus_client."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.metrics", ["prometheus_client"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                mod = importlib.import_module("fastapi_toolsets.metrics")
+                # Registry types should be available (they're stdlib-only)
+                assert hasattr(mod, "Metric")
+                assert hasattr(mod, "MetricsRegistry")
+        finally:
+            # Restore original modules
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.metrics"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_init_metrics_stub_raises_without_prometheus(self):
+        """init_metrics raises ImportError when prometheus_client is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.metrics", ["prometheus_client"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                mod = importlib.import_module("fastapi_toolsets.metrics")
+                with pytest.raises(ImportError, match="prometheus_client"):
+                    mod.init_metrics(None, None)  # type: ignore[arg-type]
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.metrics"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_init_metrics_works_with_prometheus(self):
+        """init_metrics is the real function when prometheus_client is available."""
+        from fastapi_toolsets.metrics import init_metrics
+
+        # Should be the real function, not a stub
+        assert init_metrics.__module__ == "fastapi_toolsets.metrics.handler"
+
+
+class TestPytestImportGuard:
+    """Tests for pytest module import guard when dependencies are missing."""
+
+    def test_import_raises_without_pytest_package(self):
+        """Importing fastapi_toolsets.pytest raises when pytest is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.pytest", ["pytest"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(ImportError, match="pytest"):
+                    importlib.import_module("fastapi_toolsets.pytest")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.pytest"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_import_raises_without_httpx(self):
+        """Importing fastapi_toolsets.pytest raises when httpx is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.pytest", ["httpx"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(ImportError, match="httpx"):
+                    importlib.import_module("fastapi_toolsets.pytest")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.pytest"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_all_exports_available_with_deps(self):
+        """All expected exports are available when deps are installed."""
+        from fastapi_toolsets.pytest import (
+            cleanup_tables,
+            create_async_client,
+            create_db_session,
+            create_worker_database,
+            register_fixtures,
+            worker_database_url,
+        )
+
+        assert callable(register_fixtures)
+        assert callable(create_async_client)
+        assert callable(create_db_session)
+        assert callable(create_worker_database)
+        assert callable(worker_database_url)
+        assert callable(cleanup_tables)
+
+
+class TestCliImportGuard:
+    """Tests for CLI module import guard when typer is missing."""
+
+    def test_import_raises_without_typer(self):
+        """Importing cli.app raises when typer is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.cli.app", ["typer"]
+        )
+        # Also remove cli.config since it imports typer too
+        config_keys = [
+            k for k in sys.modules if k.startswith("fastapi_toolsets.cli.config")
+        ]
+        for key in config_keys:
+            if key not in saved:
+                saved[key] = sys.modules.pop(key)
+
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(ImportError, match="typer"):
+                    importlib.import_module("fastapi_toolsets.cli.app")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.cli.app") or key.startswith(
+                    "fastapi_toolsets.cli.config"
+                ):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_error_message_suggests_cli_extra(self):
+        """Error message suggests installing the cli extra."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.cli.app", ["typer"]
+        )
+        config_keys = [
+            k for k in sys.modules if k.startswith("fastapi_toolsets.cli.config")
+        ]
+        for key in config_keys:
+            if key not in saved:
+                saved[key] = sys.modules.pop(key)
+
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(
+                    ImportError, match=r"pip install fastapi-toolsets\[cli\]"
+                ):
+                    importlib.import_module("fastapi_toolsets.cli.app")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.cli.app") or key.startswith(
+                    "fastapi_toolsets.cli.config"
+                ):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_async_command_imports_without_typer(self):
+        """async_command is importable without typer (stdlib only)."""
+        from fastapi_toolsets.cli import async_command
+
+        assert callable(async_command)

tests/test_metrics.py

@@ -0,0 +1,519 @@
+"""Tests for fastapi_toolsets.metrics module."""
+
+import os
+import tempfile
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+from prometheus_client import REGISTRY, CollectorRegistry, Counter, Gauge
+
+from fastapi_toolsets.metrics import Metric, MetricsRegistry, init_metrics
+
+
+@pytest.fixture(autouse=True)
+def _clean_prometheus_registry():
+    """Unregister test collectors from the global registry after each test."""
+    yield
+    collectors = list(REGISTRY._names_to_collectors.values())
+    for collector in collectors:
+        try:
+            REGISTRY.unregister(collector)
+        except Exception:
+            pass
+
+
+class TestMetric:
+    """Tests for Metric dataclass."""
+
+    def test_default_collect_is_false(self):
+        """Default collect is False (provider mode)."""
+        definition = Metric(name="test", func=lambda: None)
+        assert definition.collect is False
+
+    def test_collect_true(self):
+        """Collect can be set to True (collector mode)."""
+        definition = Metric(name="test", func=lambda: None, collect=True)
+        assert definition.collect is True
+
+
+class TestMetricsRegistry:
+    """Tests for MetricsRegistry class."""
+
+    def test_register_with_decorator(self):
+        """Register metric with bare decorator."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def my_counter():
+            return Counter("test_counter", "A test counter")
+
+        names = [m.name for m in registry.get_all()]
+        assert "my_counter" in names
+
+    def test_register_with_custom_name(self):
+        """Register metric with custom name."""
+        registry = MetricsRegistry()
+
+        @registry.register(name="custom_name")
+        def my_counter():
+            return Counter("test_counter_2", "A test counter")
+
+        definition = registry.get_all()[0]
+        assert definition.name == "custom_name"
+
+    def test_register_as_collector(self):
+        """Register metric with collect=True."""
+        registry = MetricsRegistry()
+
+        @registry.register(collect=True)
+        def collect_something():
+            pass
+
+        definition = registry.get_all()[0]
+        assert definition.collect is True
+
+    def test_register_preserves_function(self):
+        """Decorator returns the original function unchanged."""
+        registry = MetricsRegistry()
+
+        def my_func():
+            return "original"
+
+        result = registry.register(my_func)
+        assert result is my_func
+        assert result() == "original"
+
+    def test_register_parameterized_preserves_function(self):
+        """Parameterized decorator returns the original function unchanged."""
+        registry = MetricsRegistry()
+
+        def my_func():
+            return "original"
+
+        result = registry.register(name="custom")(my_func)
+        assert result is my_func
+        assert result() == "original"
+
+    def test_get_all(self):
+        """Get all registered metrics."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def metric_a():
+            pass
+
+        @registry.register
+        def metric_b():
+            pass
+
+        names = {m.name for m in registry.get_all()}
+        assert names == {"metric_a", "metric_b"}
+
+    def test_get_providers(self):
+        """Get only provider metrics (collect=False)."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def provider():
+            pass
+
+        @registry.register(collect=True)
+        def collector():
+            pass
+
+        providers = registry.get_providers()
+        assert len(providers) == 1
+        assert providers[0].name == "provider"
+
+    def test_get_collectors(self):
+        """Get only collector metrics (collect=True)."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def provider():
+            pass
+
+        @registry.register(collect=True)
+        def collector():
+            pass
+
+        collectors = registry.get_collectors()
+        assert len(collectors) == 1
+        assert collectors[0].name == "collector"
+
+    def test_register_overwrites_same_name(self):
+        """Registering with the same name overwrites the previous entry."""
+        registry = MetricsRegistry()
+
+        @registry.register(name="metric")
+        def first():
+            pass
+
+        @registry.register(name="metric")
+        def second():
+            pass
+
+        assert len(registry.get_all()) == 1
+        assert registry.get_all()[0].func is second
+
+
+class TestIncludeRegistry:
+    """Tests for MetricsRegistry.include_registry method."""
+
+    def test_include_empty_registry(self):
+        """Include an empty registry does nothing."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @main.register
+        def metric_a():
+            pass
+
+        main.include_registry(other)
+        assert len(main.get_all()) == 1
+
+    def test_include_registry_adds_metrics(self):
+        """Include registry adds all metrics from the other registry."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @main.register
+        def metric_a():
+            pass
+
+        @other.register
+        def metric_b():
+            pass
+
+        @other.register
+        def metric_c():
+            pass
+
+        main.include_registry(other)
+        names = {m.name for m in main.get_all()}
+        assert names == {"metric_a", "metric_b", "metric_c"}
+
+    def test_include_registry_preserves_collect_flag(self):
+        """Include registry preserves the collect flag."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @other.register(collect=True)
+        def collector():
+            pass
+
+        main.include_registry(other)
+        assert main.get_all()[0].collect is True
+
+    def test_include_registry_raises_on_duplicate(self):
+        """Include registry raises ValueError on duplicate metric names."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @main.register(name="metric")
+        def metric_main():
+            pass
+
+        @other.register(name="metric")
+        def metric_other():
+            pass
+
+        with pytest.raises(ValueError, match="already exists"):
+            main.include_registry(other)
+
+    def test_include_multiple_registries(self):
+        """Include multiple registries sequentially."""
+        main = MetricsRegistry()
+        sub1 = MetricsRegistry()
+        sub2 = MetricsRegistry()
+
+        @main.register
+        def base():
+            pass
+
+        @sub1.register
+        def sub1_metric():
+            pass
+
+        @sub2.register
+        def sub2_metric():
+            pass
+
+        main.include_registry(sub1)
+        main.include_registry(sub2)
+
+        names = {m.name for m in main.get_all()}
+        assert names == {"base", "sub1_metric", "sub2_metric"}
+
+
+class TestInitMetrics:
+    """Tests for init_metrics function."""
+
+    def test_returns_app(self):
+        """Returns the FastAPI app."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        result = init_metrics(app, registry)
+        assert result is app
+
+    def test_metrics_endpoint_responds(self):
+        """The /metrics endpoint returns 200."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert response.status_code == 200
+
+    def test_metrics_endpoint_content_type(self):
+        """The /metrics endpoint returns prometheus content type."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert "text/plain" in response.headers["content-type"]
+
+    def test_custom_path(self):
+        """Custom path is used for the metrics endpoint."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry, path="/custom-metrics")
+
+        client = TestClient(app)
+        assert client.get("/custom-metrics").status_code == 200
+        assert client.get("/metrics").status_code == 404
+
+    def test_providers_called_at_init(self):
+        """Provider functions are called once at init time."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = MagicMock()
+
+        @registry.register
+        def my_provider():
+            mock()
+
+        init_metrics(app, registry)
+
+        mock.assert_called_once()
+
+    def test_collectors_called_on_scrape(self):
+        """Collector functions are called on each scrape."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = MagicMock()
+
+        @registry.register(collect=True)
+        def my_collector():
+            mock()
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        client.get("/metrics")
+        client.get("/metrics")
+
+        assert mock.call_count == 2
+
+    def test_collectors_not_called_at_init(self):
+        """Collector functions are not called at init time."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = MagicMock()
+
+        @registry.register(collect=True)
+        def my_collector():
+            mock()
+
+        init_metrics(app, registry)
+
+        mock.assert_not_called()
+
+    def test_async_collectors_called_on_scrape(self):
+        """Async collector functions are awaited on each scrape."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = AsyncMock()
+
+        @registry.register(collect=True)
+        async def my_async_collector():
+            await mock()
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        client.get("/metrics")
+        client.get("/metrics")
+
+        assert mock.call_count == 2
+
+    def test_mixed_sync_and_async_collectors(self):
+        """Both sync and async collectors are called on scrape."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        sync_mock = MagicMock()
+        async_mock = AsyncMock()
+
+        @registry.register(collect=True)
+        def sync_collector():
+            sync_mock()
+
+        @registry.register(collect=True)
+        async def async_collector():
+            await async_mock()
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        client.get("/metrics")
+
+        sync_mock.assert_called_once()
+        async_mock.assert_called_once()
+
+    def test_registered_metrics_appear_in_output(self):
+        """Metrics created by providers appear in /metrics output."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+
+        @registry.register
+        def my_gauge():
+            g = Gauge("test_gauge_value", "A test gauge")
+            g.set(42)
+            return g
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert b"test_gauge_value" in response.content
+        assert b"42.0" in response.content
+
+    def test_endpoint_not_in_openapi_schema(self):
+        """The /metrics endpoint is not included in the OpenAPI schema."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+
+        schema = app.openapi()
+        assert "/metrics" not in schema.get("paths", {})
+
+
+class TestMultiProcessMode:
+    """Tests for multi-process Prometheus mode."""
+
+    def test_multiprocess_with_env_var(self):
+        """Multi-process mode works when PROMETHEUS_MULTIPROC_DIR is set."""
+        with tempfile.TemporaryDirectory() as tmpdir:
+            os.environ["PROMETHEUS_MULTIPROC_DIR"] = tmpdir
+            try:
+                # Use a separate registry to avoid conflicts with default
+                prom_registry = CollectorRegistry()
+                app = FastAPI()
+                registry = MetricsRegistry()
+
+                @registry.register
+                def mp_counter():
+                    return Counter(
+                        "mp_test_counter",
+                        "A multiprocess counter",
+                        registry=prom_registry,
+                    )
+
+                init_metrics(app, registry)
+
+                client = TestClient(app)
+                response = client.get("/metrics")
+
+                assert response.status_code == 200
+            finally:
+                del os.environ["PROMETHEUS_MULTIPROC_DIR"]
+
+    def test_single_process_without_env_var(self):
+        """Single-process mode when PROMETHEUS_MULTIPROC_DIR is not set."""
+        os.environ.pop("PROMETHEUS_MULTIPROC_DIR", None)
+
+        app = FastAPI()
+        registry = MetricsRegistry()
+
+        @registry.register
+        def sp_gauge():
+            g = Gauge("sp_test_gauge", "A single-process gauge")
+            g.set(99)
+            return g
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert response.status_code == 200
+        assert b"sp_test_gauge" in response.content
+
+
+class TestMetricsIntegration:
+    """Integration tests for the metrics module."""
+
+    def test_full_workflow(self):
+        """Full workflow: registry, providers, collectors, endpoint."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        call_count = {"value": 0}
+
+        @registry.register
+        def request_counter():
+            return Counter(
+                "integration_requests_total",
+                "Total requests",
+                ["method"],
+            )
+
+        @registry.register(collect=True)
+        def collect_uptime():
+            call_count["value"] += 1
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+
+        response = client.get("/metrics")
+        assert response.status_code == 200
+        assert b"integration_requests_total" in response.content
+        assert call_count["value"] == 1
+
+        response = client.get("/metrics")
+        assert call_count["value"] == 2
+
+    def test_multiple_registries_merged(self):
+        """Multiple registries can be merged and used together."""
+        app = FastAPI()
+        main = MetricsRegistry()
+        sub = MetricsRegistry()
+
+        @main.register
+        def main_gauge():
+            g = Gauge("main_gauge_val", "Main gauge")
+            g.set(1)
+            return g
+
+        @sub.register
+        def sub_gauge():
+            g = Gauge("sub_gauge_val", "Sub gauge")
+            g.set(2)
+            return g
+
+        main.include_registry(sub)
+        init_metrics(app, main)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert b"main_gauge_val" in response.content
+        assert b"sub_gauge_val" in response.content

tests/test_schemas.py

@@ -5,7 +5,9 @@ from pydantic import ValidationError
 
 from fastapi_toolsets.schemas import (
     ApiError,
+    CursorPagination,
     ErrorResponse,
+    OffsetPagination,
     PaginatedResponse,
     Pagination,
     Response,
@@ -154,12 +156,12 @@ class TestErrorResponse:
         assert data["description"] == "Details"
 
 
-class TestPagination:
+class TestOffsetPagination:
-    """Tests for Pagination schema."""
+    """Tests for OffsetPagination schema (canonical name for offset-based pagination)."""
 
     def test_create_pagination(self):
-        """Create Pagination with all fields."""
+        """Create OffsetPagination with all fields."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=100,
             items_per_page=10,
             page=1,
@@ -173,7 +175,7 @@ class TestPagination:
 
     def test_last_page_has_more_false(self):
         """Last page has has_more=False."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=25,
             items_per_page=10,
             page=3,
@@ -183,8 +185,8 @@ class TestPagination:
         assert pagination.has_more is False
 
     def test_serialization(self):
-        """Pagination serializes correctly."""
+        """OffsetPagination serializes correctly."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=50,
             items_per_page=20,
             page=2,
@@ -197,6 +199,77 @@ class TestPagination:
         assert data["page"] == 2
         assert data["has_more"] is True
 
+    def test_pagination_alias_is_offset_pagination(self):
+        """Pagination is a backward-compatible alias for OffsetPagination."""
+        assert Pagination is OffsetPagination
+
+    def test_pagination_alias_constructs_offset_pagination(self):
+        """Code using Pagination(...) still works unchanged."""
+        pagination = Pagination(
+            total_count=10,
+            items_per_page=5,
+            page=2,
+            has_more=False,
+        )
+        assert isinstance(pagination, OffsetPagination)
+
+
+class TestCursorPagination:
+    """Tests for CursorPagination schema."""
+
+    def test_create_with_next_cursor(self):
+        """CursorPagination with a next cursor indicates more pages."""
+        pagination = CursorPagination(
+            next_cursor="eyJ2YWx1ZSI6ICIxMjMifQ==",
+            items_per_page=20,
+            has_more=True,
+        )
+        assert pagination.next_cursor == "eyJ2YWx1ZSI6ICIxMjMifQ=="
+        assert pagination.prev_cursor is None
+        assert pagination.items_per_page == 20
+        assert pagination.has_more is True
+
+    def test_create_last_page(self):
+        """CursorPagination for the last page has next_cursor=None and has_more=False."""
+        pagination = CursorPagination(
+            next_cursor=None,
+            items_per_page=20,
+            has_more=False,
+        )
+        assert pagination.next_cursor is None
+        assert pagination.has_more is False
+
+    def test_prev_cursor_defaults_to_none(self):
+        """prev_cursor defaults to None."""
+        pagination = CursorPagination(
+            next_cursor=None, items_per_page=10, has_more=False
+        )
+        assert pagination.prev_cursor is None
+
+    def test_prev_cursor_can_be_set(self):
+        """prev_cursor can be explicitly set."""
+        pagination = CursorPagination(
+            next_cursor="next123",
+            prev_cursor="prev456",
+            items_per_page=10,
+            has_more=True,
+        )
+        assert pagination.prev_cursor == "prev456"
+
+    def test_serialization(self):
+        """CursorPagination serializes correctly."""
+        pagination = CursorPagination(
+            next_cursor="abc123",
+            prev_cursor="xyz789",
+            items_per_page=20,
+            has_more=True,
+        )
+        data = pagination.model_dump()
+        assert data["next_cursor"] == "abc123"
+        assert data["prev_cursor"] == "xyz789"
+        assert data["items_per_page"] == 20
+        assert data["has_more"] is True
+
 
 class TestPaginatedResponse:
     """Tests for PaginatedResponse schema."""
@@ -214,6 +287,7 @@ class TestPaginatedResponse:
             pagination=pagination,
         )
 
+        assert isinstance(response.pagination, OffsetPagination)
         assert len(response.data) == 2
         assert response.pagination.total_count == 30
         assert response.status == ResponseStatus.SUCCESS
@@ -247,6 +321,7 @@ class TestPaginatedResponse:
             pagination=pagination,
         )
 
+        assert isinstance(response.pagination, OffsetPagination)
         assert response.data == []
         assert response.pagination.total_count == 0
 
@@ -290,6 +365,36 @@ class TestPaginatedResponse:
         assert data["data"] == ["item1", "item2"]
         assert data["pagination"]["page"] == 5
 
+    def test_pagination_field_accepts_offset_pagination(self):
+        """PaginatedResponse.pagination accepts OffsetPagination."""
+        response = PaginatedResponse(
+            data=[1, 2],
+            pagination=OffsetPagination(
+                total_count=2, items_per_page=10, page=1, has_more=False
+            ),
+        )
+        assert isinstance(response.pagination, OffsetPagination)
+
+    def test_pagination_field_accepts_cursor_pagination(self):
+        """PaginatedResponse.pagination accepts CursorPagination."""
+        response = PaginatedResponse(
+            data=[1, 2],
+            pagination=CursorPagination(
+                next_cursor=None, items_per_page=10, has_more=False
+            ),
+        )
+        assert isinstance(response.pagination, CursorPagination)
+
+    def test_pagination_alias_accepted(self):
+        """Constructing PaginatedResponse with Pagination (alias) still works."""
+        response = PaginatedResponse(
+            data=[],
+            pagination=Pagination(
+                total_count=0, items_per_page=10, page=1, has_more=False
+            ),
+        )
+        assert isinstance(response.pagination, OffsetPagination)
+
 
 class TestFromAttributes:
     """Tests for from_attributes config (ORM mode)."""

uv.lock

@@ -215,6 +215,15 @@ toml = [
     { name = "tomli", marker = "python_full_version <= '3.11'" },
 ]
 
+[[package]]
+name = "deepmerge"
+version = "2.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/a8/3a/b0ba594708f1ad0bc735884b3ad854d3ca3bdc1d741e56e40bbda6263499/deepmerge-2.0.tar.gz", hash = "sha256:5c3d86081fbebd04dd5de03626a0607b809a98fb6ccba5770b62466fe940ff20", size = 19890, upload-time = "2024-08-30T05:31:50.308Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/2d/82/e5d2c1c67d19841e9edc74954c827444ae826978499bde3dfc1d007c8c11/deepmerge-2.0-py3-none-any.whl", hash = "sha256:6de9ce507115cff0bed95ff0ce9ecc31088ef50cbdf09bc90a09349a318b3d00", size = 13475, upload-time = "2024-08-30T05:31:48.659Z" },
+]
+
 [[package]]
 name = "execnet"
 version = "2.1.2"
@@ -226,7 +235,7 @@ wheels = [
 
 [[package]]
 name = "fastapi"
-version = "0.128.8"
+version = "0.133.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "annotated-doc" },
@@ -235,36 +244,63 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "typing-inspection" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/01/72/0df5c58c954742f31a7054e2dd1143bae0b408b7f36b59b85f928f9b456c/fastapi-0.128.8.tar.gz", hash = "sha256:3171f9f328c4a218f0a8d2ba8310ac3a55d1ee12c28c949650288aee25966007", size = 375523, upload-time = "2026-02-11T15:19:36.69Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/22/6f/0eafed8349eea1fa462238b54a624c8b408cd1ba2795c8e64aa6c34f8ab7/fastapi-0.133.1.tar.gz", hash = "sha256:ed152a45912f102592976fde6cbce7dae1a8a1053da94202e51dd35d184fadd6", size = 378741, upload-time = "2026-02-25T18:18:17.398Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/9f/37/37b07e276f8923c69a5df266bfcb5bac4ba8b55dfe4a126720f8c48681d1/fastapi-0.128.8-py3-none-any.whl", hash = "sha256:5618f492d0fe973a778f8fec97723f598aa9deee495040a8d51aaf3cf123ecf1", size = 103630, upload-time = "2026-02-11T15:19:35.209Z" },
+    { url = "https://files.pythonhosted.org/packages/d2/c9/a175a7779f3599dfa4adfc97a6ce0e157237b3d7941538604aadaf97bfb6/fastapi-0.133.1-py3-none-any.whl", hash = "sha256:658f34ba334605b1617a65adf2ea6461901bdb9af3a3080d63ff791ecf7dc2e2", size = 109029, upload-time = "2026-02-25T18:18:18.578Z" },
 ]
 
 [[package]]
 name = "fastapi-toolsets"
-version = "0.9.0"
+version = "1.3.0"
 source = { editable = "." }
 dependencies = [
     { name = "asyncpg" },
     { name = "fastapi" },
-    { name = "httpx" },
     { name = "pydantic" },
     { name = "sqlalchemy", extra = ["asyncio"] },
-    { name = "typer" },
 ]
 
 [package.optional-dependencies]
+all = [
+    { name = "httpx" },
+    { name = "prometheus-client" },
+    { name = "pytest" },
+    { name = "pytest-xdist" },
+    { name = "typer" },
+]
+cli = [
+    { name = "typer" },
+]
+metrics = [
+    { name = "prometheus-client" },
+]
+pytest = [
+    { name = "httpx" },
+    { name = "pytest" },
+    { name = "pytest-xdist" },
+]
+
+[package.dev-dependencies]
 dev = [
     { name = "coverage" },
+    { name = "fastapi-toolsets", extra = ["all"] },
+    { name = "httpx" },
+    { name = "mkdocstrings-python" },
     { name = "pytest" },
     { name = "pytest-anyio" },
     { name = "pytest-cov" },
     { name = "pytest-xdist" },
     { name = "ruff" },
     { name = "ty" },
+    { name = "zensical" },
 ]
-test = [
+docs = [
+    { name = "mkdocstrings-python" },
+    { name = "zensical" },
+]
+tests = [
     { name = "coverage" },
+    { name = "httpx" },
     { name = "pytest" },
     { name = "pytest-anyio" },
     { name = "pytest-cov" },
@@ -274,21 +310,56 @@ test = [
 [package.metadata]
 requires-dist = [
     { name = "asyncpg", specifier = ">=0.29.0" },
-    { name = "coverage", marker = "extra == 'test'", specifier = ">=7.0.0" },
     { name = "fastapi", specifier = ">=0.100.0" },
-    { name = "fastapi-toolsets", extras = ["test"], marker = "extra == 'dev'" },
+    { name = "fastapi-toolsets", extras = ["cli", "metrics", "pytest"], marker = "extra == 'all'" },
-    { name = "httpx", specifier = ">=0.25.0" },
+    { name = "httpx", marker = "extra == 'pytest'", specifier = ">=0.25.0" },
+    { name = "prometheus-client", marker = "extra == 'metrics'", specifier = ">=0.20.0" },
     { name = "pydantic", specifier = ">=2.0" },
-    { name = "pytest", marker = "extra == 'test'", specifier = ">=8.0.0" },
+    { name = "pytest", marker = "extra == 'pytest'", specifier = ">=8.0.0" },
-    { name = "pytest-anyio", marker = "extra == 'test'", specifier = ">=0.0.0" },
+    { name = "pytest-xdist", marker = "extra == 'pytest'", specifier = ">=3.0.0" },
-    { name = "pytest-cov", marker = "extra == 'test'", specifier = ">=4.0.0" },
-    { name = "pytest-xdist", marker = "extra == 'test'", specifier = ">=3.0.0" },
-    { name = "ruff", marker = "extra == 'dev'", specifier = ">=0.1.0" },
     { name = "sqlalchemy", extras = ["asyncio"], specifier = ">=2.0" },
-    { name = "ty", marker = "extra == 'dev'", specifier = ">=0.0.1a0" },
+    { name = "typer", marker = "extra == 'cli'", specifier = ">=0.9.0" },
-    { name = "typer", specifier = ">=0.9.0" },
+]
+provides-extras = ["cli", "metrics", "pytest", "all"]
+
+[package.metadata.requires-dev]
+dev = [
+    { name = "coverage", specifier = ">=7.0.0" },
+    { name = "fastapi-toolsets", extras = ["all"] },
+    { name = "httpx", specifier = ">=0.25.0" },
+    { name = "mkdocstrings-python", specifier = ">=2.0.2" },
+    { name = "pytest", specifier = ">=8.0.0" },
+    { name = "pytest-anyio", specifier = ">=0.0.0" },
+    { name = "pytest-cov", specifier = ">=4.0.0" },
+    { name = "pytest-xdist", specifier = ">=3.0.0" },
+    { name = "ruff", specifier = ">=0.1.0" },
+    { name = "ty", specifier = ">=0.0.1a0" },
+    { name = "zensical", specifier = ">=0.0.23" },
+]
+docs = [
+    { name = "mkdocstrings-python", specifier = ">=2.0.2" },
+    { name = "zensical", specifier = ">=0.0.23" },
+]
+tests = [
+    { name = "coverage", specifier = ">=7.0.0" },
+    { name = "httpx", specifier = ">=0.25.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
+    { name = "pytest-anyio", specifier = ">=0.0.0" },
+    { name = "pytest-cov", specifier = ">=4.0.0" },
+    { name = "pytest-xdist", specifier = ">=3.0.0" },
+]
+
+[[package]]
+name = "ghp-import"
+version = "2.1.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "python-dateutil" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/d9/29/d40217cbe2f6b1359e00c6c307bb3fc876ba74068cbab3dde77f03ca0dc4/ghp-import-2.1.0.tar.gz", hash = "sha256:9c535c4c61193c2df8871222567d7fd7e5014d835f97dc7b7439069e2413d343", size = 10943, upload-time = "2022-05-02T15:47:16.11Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/f7/ec/67fbef5d497f86283db54c22eec6f6140243aae73265799baaaa19cd17fb/ghp_import-2.1.0-py3-none-any.whl", hash = "sha256:8337dd7b50877f163d4c0289bc1f1c7f127550241988d568c1db512c4324a619", size = 11034, upload-time = "2022-05-02T15:47:14.552Z" },
 ]
-provides-extras = ["test", "dev"]
 
 [[package]]
 name = "greenlet"
@@ -342,6 +413,14 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/e1/2b/98c7f93e6db9977aaee07eb1e51ca63bd5f779b900d362791d3252e60558/greenlet-3.3.1-cp314-cp314t-win_amd64.whl", hash = "sha256:301860987846c24cb8964bdec0e31a96ad4a2a801b41b4ef40963c1b44f33451", size = 233181, upload-time = "2026-01-23T15:33:00.29Z" },
 ]
 
+[[package]]
+name = "griffelib"
+version = "2.0.0"
+source = { registry = "https://pypi.org/simple" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/4d/51/c936033e16d12b627ea334aaaaf42229c37620d0f15593456ab69ab48161/griffelib-2.0.0-py3-none-any.whl", hash = "sha256:01284878c966508b6d6f1dbff9b6fa607bc062d8261c5c7253cb285b06422a7f", size = 142004, upload-time = "2026-02-09T19:09:40.561Z" },
+]
+
 [[package]]
 name = "h11"
 version = "0.16.0"
@@ -397,6 +476,27 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/cb/b1/3846dd7f199d53cb17f49cba7e651e9ce294d8497c8c150530ed11865bb8/iniconfig-2.3.0-py3-none-any.whl", hash = "sha256:f631c04d2c48c52b84d0d0549c99ff3859c98df65b3101406327ecc7d53fbf12", size = 7484, upload-time = "2025-10-18T21:55:41.639Z" },
 ]
 
+[[package]]
+name = "jinja2"
+version = "3.1.6"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "markupsafe" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/df/bf/f7da0350254c0ed7c72f3e33cef02e048281fec7ecec5f032d4aac52226b/jinja2-3.1.6.tar.gz", hash = "sha256:0137fb05990d35f1275a587e9aee6d56da821fc83491a0fb838183be43f66d6d", size = 245115, upload-time = "2025-03-05T20:05:02.478Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/62/a1/3d680cbfd5f4b8f15abc1d571870c5fc3e594bb582bc3b64ea099db13e56/jinja2-3.1.6-py3-none-any.whl", hash = "sha256:85ece4451f492d0c13c5dd7c13a64681a86afae63a5f347908daf103ce6d2f67", size = 134899, upload-time = "2025-03-05T20:05:00.369Z" },
+]
+
+[[package]]
+name = "markdown"
+version = "3.10.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/2b/f4/69fa6ed85ae003c2378ffa8f6d2e3234662abd02c10d216c0ba96081a238/markdown-3.10.2.tar.gz", hash = "sha256:994d51325d25ad8aa7ce4ebaec003febcce822c3f8c911e3b17c52f7f589f950", size = 368805, upload-time = "2026-02-09T14:57:26.942Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/de/1f/77fa3081e4f66ca3576c896ae5d31c3002ac6607f9747d2e3aa49227e464/markdown-3.10.2-py3-none-any.whl", hash = "sha256:e91464b71ae3ee7afd3017d9f358ef0baf158fd9a298db92f1d4761133824c36", size = 108180, upload-time = "2026-02-09T14:57:25.787Z" },
+]
+
 [[package]]
 name = "markdown-it-py"
 version = "4.0.0"
@@ -409,6 +509,80 @@ wheels = [
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 ]
 
+[[package]]
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+version = "3.0.3"
+source = { registry = "https://pypi.org/simple" }
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zensical.toml

@@ -0,0 +1,97 @@
+[project]
+site_name = "FastAPI Toolsets"
+site_description = "Production-ready utilities for FastAPI applications."
+site_author = "d3vyce"
+site_url = "https://fastapi-toolsets.d3vyce.fr"
+copyright = "Copyright © 2026 d3vyce"
+repo_url = "https://github.com/d3vyce/fastapi-toolsets"
+
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+custom_dir = "docs/overrides"
+language = "en"
+features = [
+    "announce.dismiss",
+    "content.action.view",
+    "content.code.annotate",
+    "content.code.copy",
+    "content.code.select",
+    "content.footnote.tooltips",
+    "content.tabs.link",
+    "content.tooltips",
+    "navigation.footer",
+    "navigation.indexes",
+    "navigation.instant",
+    "navigation.instant.prefetch",
+    "navigation.path",
+    "navigation.sections",
+    "navigation.tabs",
+    "navigation.top",
+    "navigation.tracking",
+    "search.highlight",
+]
+
+[[project.theme.palette]]
+scheme = "default"
+toggle.icon = "lucide/sun"
+toggle.name = "Switch to dark mode"
+
+[[project.theme.palette]]
+scheme = "slate"
+toggle.icon = "lucide/moon"
+toggle.name = "Switch to light mode"
+
+[project.theme.font]
+text = "Inter"
+code = "Jetbrains Mono"
+
+[project.theme.icon]
+repo = "fontawesome/brands/github"
+
+[project.plugins.mkdocstrings.handlers.python]
+inventories = ["https://docs.python.org/3/objects.inv"]
+paths = ["src"]
+
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+docstring_style = "google"
+inherited_members = true
+show_source = false
+show_root_heading = true
+
+[project.markdown_extensions]
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+admonition = {}
+attr_list = {}
+def_list = {}
+footnotes = {}
+md_in_html = {}
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+"pymdownx.tasklist" = {custom_checkbox = true}
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+
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+line_spans = "__span"
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+
+[project.markdown_extensions."pymdownx.superfences"]
+custom_fences = [{name = "mermaid", class = "mermaid"}]
+
+[project.markdown_extensions."pymdownx.tabbed"]
+alternate_style = true
+combine_header_slug = true
+
+[project.markdown_extensions."toc"]
+permalink = true
+
+[project.markdown_extensions."pymdownx.snippets"]
+base_path = ["."]
+check_paths = true