refactor: simplify and deduplicate across crud, metrics, cli, and

exceptions

.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 +1,473 @@
+# 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
+  }
+}
+```
+
+### 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.
+
+---
+
+[: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 = "0.10.0"
-description = "Reusable tools for FastAPI: async CRUD, fixtures, CLI, and standardized responses for SQLAlchemy + PostgreSQL"
+version = "1.3.0"
+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",
-    "httpx>=0.25.0",
+    "sqlalchemy[asyncio]>=2.0",
 ]
 
 [project.urls]
@@ -46,25 +44,45 @@ Repository = "https://github.com/d3vyce/fastapi-toolsets"
 Issues = "https://github.com/d3vyce/fastapi-toolsets/issues"
 
 [project.optional-dependencies]
+cli = [
+    "typer>=0.9.0",
+]
 metrics = [
     "prometheus_client>=0.20.0",
 ]
-test = [
-    "pytest>=8.0.0",
-    "pytest-anyio>=0.0.0",
+pytest = [
+    "httpx>=0.25.0",
     "pytest-xdist>=3.0.0",
-    "coverage>=7.0.0",
-    "pytest-cov>=4.0.0",
+    "pytest>=8.0.0",
 ]
-dev = [
-    "fastapi-toolsets[metrics,test]",
-    "ruff>=0.1.0",
-    "ty>=0.0.1a0",
+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__ = "0.10.0"
+__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/commands/fixtures.py

@@ -72,7 +72,7 @@ async def load(
     registry = get_fixtures_registry()
     db_context = get_db_context()
 
-    context_list = [c.value for c in contexts] if contexts else [Context.BASE]
+    context_list = list(contexts) if contexts else [Context.BASE]
 
     ordered = registry.resolve_context_dependencies(*context_list)
 

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

@@ -1,17 +1,18 @@
 """Generic async CRUD operations for SQLAlchemy models."""
 
-from ..exceptions import NoSearchableFieldsError
-from .factory import CrudFactory, JoinType, M2MFieldType
-from .search import (
-    SearchConfig,
-    get_searchable_fields,
-)
+from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
+from ..types import FacetFieldType, JoinType, M2MFieldType, OrderByClause
+from .factory import CrudFactory
+from .search import SearchConfig, get_searchable_fields
 
 __all__ = [
     "CrudFactory",
+    "FacetFieldType",
     "get_searchable_fields",
+    "InvalidFacetFilterError",
     "JoinType",
     "M2MFieldType",
     "NoSearchableFieldsError",
+    "OrderByClause",
     "SearchConfig",
 ]

src/fastapi_toolsets/crud/factory.py

@@ -2,26 +2,71 @@
 
 from __future__ import annotations
 
-from collections.abc import Mapping, Sequence
-from typing import Any, ClassVar, Generic, Literal, Self, TypeVar, cast, overload
+import base64
+import inspect
+import json
+import uuid as uuid_module
+from collections.abc import Awaitable, Callable, Sequence
+from datetime import date, datetime
+from decimal import Decimal
+from typing import Any, ClassVar, Generic, Literal, Self, cast, overload
 
+from fastapi import Query
 from pydantic import BaseModel
-from sqlalchemy import and_, func, select
+from sqlalchemy import Date, DateTime, Float, Integer, Numeric, Uuid, and_, func, select
 from sqlalchemy import delete as sql_delete
 from sqlalchemy.dialects.postgresql import insert
 from sqlalchemy.exc import NoResultFound
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase, QueryableAttribute, selectinload
+from sqlalchemy.sql.base import ExecutableOption
 from sqlalchemy.sql.roles import WhereHavingRole
 
 from ..db import get_transaction
-from ..exceptions import NotFoundError
-from ..schemas import PaginatedResponse, Pagination, Response
-from .search import SearchConfig, SearchFieldType, build_search_filters
+from ..exceptions import InvalidOrderFieldError, NotFoundError
+from ..schemas import CursorPagination, OffsetPagination, PaginatedResponse, Response
+from ..types import (
+    FacetFieldType,
+    JoinType,
+    M2MFieldType,
+    ModelType,
+    OrderByClause,
+    SchemaType,
+    SearchFieldType,
+)
+from .search import (
+    SearchConfig,
+    build_facets,
+    build_filter_by,
+    build_search_filters,
+    facet_keys,
+)
 
-ModelType = TypeVar("ModelType", bound=DeclarativeBase)
-JoinType = list[tuple[type[DeclarativeBase], Any]]
-M2MFieldType = Mapping[str, QueryableAttribute[Any]]
+
+def _encode_cursor(value: Any) -> str:
+    """Encode cursor column value as an base64 string."""
+    return base64.b64encode(json.dumps(str(value)).encode()).decode()
+
+
+def _decode_cursor(cursor: str) -> str:
+    """Decode cursor base64 string."""
+    return json.loads(base64.b64decode(cursor.encode()).decode())
+
+
+def _apply_joins(q: Any, joins: JoinType | None, outer_join: bool) -> Any:
+    """Apply a list of (model, condition) joins to a SQLAlchemy select query."""
+    if not joins:
+        return q
+    for model, condition in joins:
+        q = q.outerjoin(model, condition) if outer_join else q.join(model, condition)
+    return q
+
+
+def _apply_search_joins(q: Any, search_joins: list[Any]) -> Any:
+    """Apply relationship-based outer joins (from search/filter_by) to a query."""
+    for join_rel in search_joins:
+        q = q.outerjoin(join_rel)
+    return q
 
 
 class AsyncCrud(Generic[ModelType]):
@@ -32,27 +77,20 @@ class AsyncCrud(Generic[ModelType]):
 
     model: ClassVar[type[DeclarativeBase]]
     searchable_fields: ClassVar[Sequence[SearchFieldType] | None] = None
+    facet_fields: ClassVar[Sequence[FacetFieldType] | None] = None
+    order_fields: ClassVar[Sequence[QueryableAttribute[Any]] | None] = None
     m2m_fields: ClassVar[M2MFieldType | None] = None
+    default_load_options: ClassVar[list[ExecutableOption] | None] = None
+    cursor_column: ClassVar[Any | None] = None
 
-    @overload
     @classmethod
-    async def create(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        obj: BaseModel,
-        *,
-        as_response: Literal[True],
-    ) -> Response[ModelType]: ...
-
-    @overload
-    @classmethod
-    async def create(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        obj: BaseModel,
-        *,
-        as_response: Literal[False] = ...,
-    ) -> ModelType: ...
+    def _resolve_load_options(
+        cls, load_options: list[ExecutableOption] | None
+    ) -> list[ExecutableOption] | None:
+        """Return load_options if provided, else fall back to default_load_options."""
+        if load_options is not None:
+            return load_options
+        return cls.default_load_options
 
     @classmethod
     async def _resolve_m2m(
@@ -110,23 +148,189 @@ class AsyncCrud(Generic[ModelType]):
             return set()
         return set(cls.m2m_fields.keys())
 
+    @classmethod
+    def _resolve_facet_fields(
+        cls: type[Self],
+        facet_fields: Sequence[FacetFieldType] | None,
+    ) -> Sequence[FacetFieldType] | None:
+        """Return facet_fields if given, otherwise fall back to the class-level default."""
+        return facet_fields if facet_fields is not None else cls.facet_fields
+
+    @classmethod
+    def _prepare_filter_by(
+        cls: type[Self],
+        filter_by: dict[str, Any] | BaseModel | None,
+        facet_fields: Sequence[FacetFieldType] | None,
+    ) -> tuple[list[Any], list[Any]]:
+        """Normalize filter_by and return (filters, joins) to apply to the query."""
+        if isinstance(filter_by, BaseModel):
+            filter_by = filter_by.model_dump(exclude_none=True)
+        if not filter_by:
+            return [], []
+        resolved = cls._resolve_facet_fields(facet_fields)
+        return build_filter_by(filter_by, resolved or [])
+
+    @classmethod
+    async def _build_filter_attributes(
+        cls: type[Self],
+        session: AsyncSession,
+        facet_fields: Sequence[FacetFieldType] | None,
+        filters: list[Any],
+        search_joins: list[Any],
+    ) -> dict[str, list[Any]] | None:
+        """Build facet filter_attributes, or return None if no facet fields configured."""
+        resolved = cls._resolve_facet_fields(facet_fields)
+        if not resolved:
+            return None
+        return await build_facets(
+            session,
+            cls.model,
+            resolved,
+            base_filters=filters,
+            base_joins=search_joins,
+        )
+
+    @classmethod
+    def filter_params(
+        cls: type[Self],
+        *,
+        facet_fields: Sequence[FacetFieldType] | None = None,
+    ) -> Callable[..., Awaitable[dict[str, list[str]]]]:
+        """Return a FastAPI dependency that collects facet filter values from query parameters.
+        Args:
+            facet_fields: Override the facet fields for this dependency. Falls back to the
+                class-level ``facet_fields`` if not provided.
+
+        Returns:
+            An async dependency function named ``{Model}FilterParams`` that resolves to a
+            ``dict[str, list[str]]`` containing only the keys that were supplied in the
+            request (absent/``None`` parameters are excluded).
+
+        Raises:
+            ValueError: If no facet fields are configured on this CRUD class and none are
+                provided via ``facet_fields``.
+        """
+        fields = cls._resolve_facet_fields(facet_fields)
+        if not fields:
+            raise ValueError(
+                f"{cls.__name__} has no facet_fields configured. "
+                "Pass facet_fields= or set them on CrudFactory."
+            )
+        keys = facet_keys(fields)
+
+        async def dependency(**kwargs: Any) -> dict[str, list[str]]:
+            return {k: v for k, v in kwargs.items() if v is not None}
+
+        dependency.__name__ = f"{cls.model.__name__}FilterParams"
+        dependency.__signature__ = inspect.Signature(  # type: ignore[attr-defined]
+            parameters=[
+                inspect.Parameter(
+                    k,
+                    inspect.Parameter.KEYWORD_ONLY,
+                    annotation=list[str] | None,
+                    default=Query(default=None),
+                )
+                for k in keys
+            ]
+        )
+
+        return dependency
+
+    @classmethod
+    def order_params(
+        cls: type[Self],
+        *,
+        order_fields: Sequence[QueryableAttribute[Any]] | None = None,
+        default_field: QueryableAttribute[Any] | None = None,
+        default_order: Literal["asc", "desc"] = "asc",
+    ) -> Callable[..., Awaitable[OrderByClause | None]]:
+        """Return a FastAPI dependency that resolves order query params into an order_by clause.
+
+        Args:
+            order_fields: Override the allowed order fields. Falls back to the class-level
+                ``order_fields`` if not provided.
+            default_field: Field to order by when ``order_by`` query param is absent.
+                If ``None`` and no ``order_by`` is provided, no ordering is applied.
+            default_order: Default order direction when ``order`` is absent
+                (``"asc"`` or ``"desc"``).
+
+        Returns:
+            An async dependency function named ``{Model}OrderParams`` that resolves to an
+            ``OrderByClause`` (or ``None``). Pass it to ``Depends()`` in your route.
+
+        Raises:
+            ValueError: If no order fields are configured on this CRUD class and none are
+                provided via ``order_fields``.
+            InvalidOrderFieldError: When the request provides an unknown ``order_by`` value.
+        """
+        fields = order_fields if order_fields is not None else cls.order_fields
+        if not fields:
+            raise ValueError(
+                f"{cls.__name__} has no order_fields configured. "
+                "Pass order_fields= or set them on CrudFactory."
+            )
+        field_map: dict[str, QueryableAttribute[Any]] = {f.key: f for f in fields}
+        valid_keys = sorted(field_map.keys())
+
+        async def dependency(
+            order_by: str | None = Query(
+                None, description=f"Field to order by. Valid values: {valid_keys}"
+            ),
+            order: Literal["asc", "desc"] = Query(
+                default_order, description="Sort direction"
+            ),
+        ) -> OrderByClause | None:
+            if order_by is None:
+                if default_field is None:
+                    return None
+                field = default_field
+            elif order_by not in field_map:
+                raise InvalidOrderFieldError(order_by, valid_keys)
+            else:
+                field = field_map[order_by]
+            return field.asc() if order == "asc" else field.desc()
+
+        dependency.__name__ = f"{cls.model.__name__}OrderParams"
+        return dependency
+
+    @overload
+    @classmethod
+    async def create(  # pragma: no cover
+        cls: type[Self],
+        session: AsyncSession,
+        obj: BaseModel,
+        *,
+        schema: type[SchemaType],
+    ) -> Response[SchemaType]: ...
+
+    @overload
+    @classmethod
+    async def create(  # pragma: no cover
+        cls: type[Self],
+        session: AsyncSession,
+        obj: BaseModel,
+        *,
+        schema: None = ...,
+    ) -> ModelType: ...
+
     @classmethod
     async def create(
         cls: type[Self],
         session: AsyncSession,
         obj: BaseModel,
         *,
-        as_response: bool = False,
-    ) -> ModelType | Response[ModelType]:
+        schema: type[BaseModel] | None = None,
+    ) -> ModelType | Response[Any]:
         """Create a new record in the database.
 
         Args:
             session: DB async session
             obj: Pydantic model with data to create
-            as_response: If True, wrap result in Response object
+            schema: Pydantic schema to serialize the result into. When provided,
+                the result is automatically wrapped in a ``Response[schema]``.
 
         Returns:
-            Created model instance or Response wrapping it
+            Created model instance, or ``Response[schema]`` when ``schema`` is given.
         """
         async with get_transaction(session):
             m2m_exclude = cls._m2m_schema_fields()
@@ -143,8 +347,8 @@ class AsyncCrud(Generic[ModelType]):
             session.add(db_model)
         await session.refresh(db_model)
         result = cast(ModelType, db_model)
-        if as_response:
-            return Response(data=result)
+        if schema:
+            return Response(data=schema.model_validate(result))
         return result
 
     @overload
@@ -157,9 +361,9 @@ class AsyncCrud(Generic[ModelType]):
         joins: JoinType | None = None,
         outer_join: bool = False,
         with_for_update: bool = False,
-        load_options: list[Any] | None = None,
-        as_response: Literal[True],
-    ) -> Response[ModelType]: ...
+        load_options: list[ExecutableOption] | None = None,
+        schema: type[SchemaType],
+    ) -> Response[SchemaType]: ...
 
     @overload
     @classmethod
@@ -171,8 +375,8 @@ class AsyncCrud(Generic[ModelType]):
         joins: JoinType | None = None,
         outer_join: bool = False,
         with_for_update: bool = False,
-        load_options: list[Any] | None = None,
-        as_response: Literal[False] = ...,
+        load_options: list[ExecutableOption] | None = None,
+        schema: None = ...,
     ) -> ModelType: ...
 
     @classmethod
@@ -184,9 +388,9 @@ class AsyncCrud(Generic[ModelType]):
         joins: JoinType | None = None,
         outer_join: bool = False,
         with_for_update: bool = False,
-        load_options: list[Any] | None = None,
-        as_response: bool = False,
-    ) -> ModelType | Response[ModelType]:
+        load_options: list[ExecutableOption] | None = None,
+        schema: type[BaseModel] | None = None,
+    ) -> ModelType | Response[Any]:
         """Get exactly one record. Raises NotFoundError if not found.
 
         Args:
@@ -196,26 +400,21 @@ class AsyncCrud(Generic[ModelType]):
             outer_join: Use LEFT OUTER JOIN instead of INNER JOIN
             with_for_update: Lock the row for update
             load_options: SQLAlchemy loader options (e.g., selectinload)
-            as_response: If True, wrap result in Response object
+            schema: Pydantic schema to serialize the result into. When provided,
+                the result is automatically wrapped in a ``Response[schema]``.
 
         Returns:
-            Model instance or Response wrapping it
+            Model instance, or ``Response[schema]`` when ``schema`` is given.
 
         Raises:
             NotFoundError: If no record found
             MultipleResultsFound: If more than one record found
         """
         q = select(cls.model)
-        if joins:
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
+        q = _apply_joins(q, joins, outer_join)
         q = q.where(and_(*filters))
-        if load_options:
-            q = q.options(*load_options)
+        if resolved := cls._resolve_load_options(load_options):
+            q = q.options(*resolved)
         if with_for_update:
             q = q.with_for_update()
         result = await session.execute(q)
@@ -223,8 +422,8 @@ class AsyncCrud(Generic[ModelType]):
         if not item:
             raise NotFoundError()
         result = cast(ModelType, item)
-        if as_response:
-            return Response(data=result)
+        if schema:
+            return Response(data=schema.model_validate(result))
         return result
 
     @classmethod
@@ -235,7 +434,7 @@ class AsyncCrud(Generic[ModelType]):
         *,
         joins: JoinType | None = None,
         outer_join: bool = False,
-        load_options: list[Any] | None = None,
+        load_options: list[ExecutableOption] | None = None,
     ) -> ModelType | None:
         """Get the first matching record, or None.
 
@@ -250,17 +449,11 @@ class AsyncCrud(Generic[ModelType]):
             Model instance or None
         """
         q = select(cls.model)
-        if joins:
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
+        q = _apply_joins(q, joins, outer_join)
         if filters:
             q = q.where(and_(*filters))
-        if load_options:
-            q = q.options(*load_options)
+        if resolved := cls._resolve_load_options(load_options):
+            q = q.options(*resolved)
         result = await session.execute(q)
         return cast(ModelType | None, result.unique().scalars().first())
 
@@ -272,8 +465,8 @@ class AsyncCrud(Generic[ModelType]):
         filters: list[Any] | None = None,
         joins: JoinType | None = None,
         outer_join: bool = False,
-        load_options: list[Any] | None = None,
-        order_by: Any | None = None,
+        load_options: list[ExecutableOption] | None = None,
+        order_by: OrderByClause | None = None,
         limit: int | None = None,
         offset: int | None = None,
     ) -> Sequence[ModelType]:
@@ -293,17 +486,11 @@ class AsyncCrud(Generic[ModelType]):
             List of model instances
         """
         q = select(cls.model)
-        if joins:
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
+        q = _apply_joins(q, joins, outer_join)
         if filters:
             q = q.where(and_(*filters))
-        if load_options:
-            q = q.options(*load_options)
+        if resolved := cls._resolve_load_options(load_options):
+            q = q.options(*resolved)
         if order_by is not None:
             q = q.order_by(order_by)
         if offset is not None:
@@ -323,8 +510,8 @@ class AsyncCrud(Generic[ModelType]):
         *,
         exclude_unset: bool = True,
         exclude_none: bool = False,
-        as_response: Literal[True],
-    ) -> Response[ModelType]: ...
+        schema: type[SchemaType],
+    ) -> Response[SchemaType]: ...
 
     @overload
     @classmethod
@@ -336,7 +523,7 @@ class AsyncCrud(Generic[ModelType]):
         *,
         exclude_unset: bool = True,
         exclude_none: bool = False,
-        as_response: Literal[False] = ...,
+        schema: None = ...,
     ) -> ModelType: ...
 
     @classmethod
@@ -348,8 +535,8 @@ class AsyncCrud(Generic[ModelType]):
         *,
         exclude_unset: bool = True,
         exclude_none: bool = False,
-        as_response: bool = False,
-    ) -> ModelType | Response[ModelType]:
+        schema: type[BaseModel] | None = None,
+    ) -> ModelType | Response[Any]:
         """Update a record in the database.
 
         Args:
@@ -358,10 +545,11 @@ class AsyncCrud(Generic[ModelType]):
             filters: List of SQLAlchemy filter conditions
             exclude_unset: Exclude fields not explicitly set in the schema
             exclude_none: Exclude fields with None value
-            as_response: If True, wrap result in Response object
+            schema: Pydantic schema to serialize the result into. When provided,
+                the result is automatically wrapped in a ``Response[schema]``.
 
         Returns:
-            Updated model instance or Response wrapping it
+            Updated model instance, or ``Response[schema]`` when ``schema`` is given.
 
         Raises:
             NotFoundError: If no record found
@@ -371,7 +559,7 @@ class AsyncCrud(Generic[ModelType]):
 
             # Eagerly load M2M relationships that will be updated so that
             # setattr does not trigger a lazy load (which fails in async).
-            m2m_load_options: list[Any] = []
+            m2m_load_options: list[ExecutableOption] = []
             if m2m_exclude and cls.m2m_fields:
                 for schema_field, rel in cls.m2m_fields.items():
                     if schema_field in obj.model_fields_set:
@@ -395,8 +583,8 @@ class AsyncCrud(Generic[ModelType]):
                 for rel_attr, related_instances in m2m_resolved.items():
                     setattr(db_model, rel_attr, related_instances)
         await session.refresh(db_model)
-        if as_response:
-            return Response(data=db_model)
+        if schema:
+            return Response(data=schema.model_validate(db_model))
         return db_model
 
     @classmethod
@@ -452,7 +640,7 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         filters: list[Any],
         *,
-        as_response: Literal[True],
+        return_response: Literal[True],
     ) -> Response[None]: ...
 
     @overload
@@ -462,8 +650,8 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         filters: list[Any],
         *,
-        as_response: Literal[False] = ...,
-    ) -> bool: ...
+        return_response: Literal[False] = ...,
+    ) -> None: ...
 
     @classmethod
     async def delete(
@@ -471,24 +659,26 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         filters: list[Any],
         *,
-        as_response: bool = False,
-    ) -> bool | Response[None]:
+        return_response: bool = False,
+    ) -> None | Response[None]:
         """Delete records from the database.
 
         Args:
             session: DB async session
             filters: List of SQLAlchemy filter conditions
-            as_response: If True, wrap result in Response object
+            return_response: When ``True``, returns ``Response[None]`` instead
+                of ``None``. Useful for API endpoints that expect a consistent
+                response envelope.
 
         Returns:
-            True if deletion was executed, or Response wrapping it
+            ``None``, or ``Response[None]`` when ``return_response=True``.
         """
         async with get_transaction(session):
             q = sql_delete(cls.model).where(and_(*filters))
             await session.execute(q)
-        if as_response:
+        if return_response:
             return Response(data=None)
-        return True
+        return None
 
     @classmethod
     async def count(
@@ -511,13 +701,7 @@ class AsyncCrud(Generic[ModelType]):
             Number of matching records
         """
         q = select(func.count()).select_from(cls.model)
-        if joins:
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
+        q = _apply_joins(q, joins, outer_join)
         if filters:
             q = q.where(and_(*filters))
         result = await session.execute(q)
@@ -544,33 +728,30 @@ class AsyncCrud(Generic[ModelType]):
             True if at least one record matches
         """
         q = select(cls.model)
-        if joins:
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
+        q = _apply_joins(q, joins, outer_join)
         q = q.where(and_(*filters)).exists().select()
         result = await session.execute(q)
         return bool(result.scalar())
 
     @classmethod
-    async def paginate(
+    async def offset_paginate(
         cls: type[Self],
         session: AsyncSession,
         *,
         filters: list[Any] | None = None,
         joins: JoinType | None = None,
         outer_join: bool = False,
-        load_options: list[Any] | None = None,
-        order_by: Any | None = None,
+        load_options: list[ExecutableOption] | None = None,
+        order_by: OrderByClause | None = None,
         page: int = 1,
         items_per_page: int = 20,
         search: str | SearchConfig | None = None,
         search_fields: Sequence[SearchFieldType] | None = None,
-    ) -> PaginatedResponse[ModelType]:
-        """Get paginated results with metadata.
+        facet_fields: Sequence[FacetFieldType] | None = None,
+        filter_by: dict[str, Any] | BaseModel | None = None,
+        schema: type[BaseModel],
+    ) -> PaginatedResponse[Any]:
+        """Get paginated results using offset-based pagination.
 
         Args:
             session: DB async session
@@ -583,50 +764,52 @@ class AsyncCrud(Generic[ModelType]):
             items_per_page: Number of items per page
             search: Search query string or SearchConfig object
             search_fields: Fields to search in (overrides class default)
+            facet_fields: Columns to compute distinct values for (overrides class default)
+            filter_by: Dict of {column_key: value} to filter by declared facet fields.
+                Keys must match the column.key of a facet field. Scalar → equality,
+                list → IN clause. Raises InvalidFacetFilterError for unknown keys.
+            schema: Pydantic schema to serialize each item into.
 
         Returns:
-            Dict with 'data' and 'pagination' keys
+            PaginatedResponse with OffsetPagination metadata
         """
         filters = list(filters) if filters else []
         offset = (page - 1) * items_per_page
-        search_joins: list[Any] = []
+
+        fb_filters, search_joins = cls._prepare_filter_by(filter_by, facet_fields)
+        filters.extend(fb_filters)
 
         # Build search filters
         if search:
-            search_filters, search_joins = build_search_filters(
+            search_filters, new_search_joins = build_search_filters(
                 cls.model,
                 search,
                 search_fields=search_fields,
                 default_fields=cls.searchable_fields,
             )
             filters.extend(search_filters)
+            search_joins.extend(new_search_joins)
 
         # Build query with joins
         q = select(cls.model)
 
         # Apply explicit joins
-        if joins:
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
+        q = _apply_joins(q, joins, outer_join)
 
         # Apply search joins (always outer joins for search)
-        for join_rel in search_joins:
-            q = q.outerjoin(join_rel)
+        q = _apply_search_joins(q, search_joins)
 
         if filters:
             q = q.where(and_(*filters))
-        if load_options:
-            q = q.options(*load_options)
+        if resolved := cls._resolve_load_options(load_options):
+            q = q.options(*resolved)
         if order_by is not None:
             q = q.order_by(order_by)
 
         q = q.offset(offset).limit(items_per_page)
         result = await session.execute(q)
-        items = cast(list[ModelType], result.unique().scalars().all())
+        raw_items = cast(list[ModelType], result.unique().scalars().all())
+        items: list[Any] = [schema.model_validate(item) for item in raw_items]
 
         # Count query (with same joins and filters)
         pk_col = cls.model.__mapper__.primary_key[0]
@@ -634,17 +817,10 @@ class AsyncCrud(Generic[ModelType]):
         count_q = count_q.select_from(cls.model)
 
         # Apply explicit joins to count query
-        if joins:
-            for model, condition in joins:
-                count_q = (
-                    count_q.outerjoin(model, condition)
-                    if outer_join
-                    else count_q.join(model, condition)
-                )
+        count_q = _apply_joins(count_q, joins, outer_join)
 
         # Apply search joins to count query
-        for join_rel in search_joins:
-            count_q = count_q.outerjoin(join_rel)
+        count_q = _apply_search_joins(count_q, search_joins)
 
         if filters:
             count_q = count_q.where(and_(*filters))
@@ -652,14 +828,161 @@ class AsyncCrud(Generic[ModelType]):
         count_result = await session.execute(count_q)
         total_count = count_result.scalar_one()
 
+        filter_attributes = await cls._build_filter_attributes(
+            session, facet_fields, filters, search_joins
+        )
+
         return PaginatedResponse(
             data=items,
-            pagination=Pagination(
+            pagination=OffsetPagination(
                 total_count=total_count,
                 items_per_page=items_per_page,
                 page=page,
                 has_more=page * items_per_page < total_count,
             ),
+            filter_attributes=filter_attributes,
+        )
+
+    @classmethod
+    async def cursor_paginate(
+        cls: type[Self],
+        session: AsyncSession,
+        *,
+        cursor: str | None = None,
+        filters: list[Any] | None = None,
+        joins: JoinType | None = None,
+        outer_join: bool = False,
+        load_options: list[ExecutableOption] | None = None,
+        order_by: OrderByClause | None = None,
+        items_per_page: int = 20,
+        search: str | SearchConfig | None = None,
+        search_fields: Sequence[SearchFieldType] | None = None,
+        facet_fields: Sequence[FacetFieldType] | None = None,
+        filter_by: dict[str, Any] | BaseModel | None = None,
+        schema: type[BaseModel],
+    ) -> PaginatedResponse[Any]:
+        """Get paginated results using cursor-based pagination.
+
+        Args:
+            session: DB async session.
+            cursor: Cursor string from a previous ``CursorPagination``.
+                Omit (or pass ``None``) to start from the beginning.
+            filters: List of SQLAlchemy filter conditions.
+            joins: List of ``(model, condition)`` tuples for joining related
+                tables.
+            outer_join: Use LEFT OUTER JOIN instead of INNER JOIN.
+            load_options: SQLAlchemy loader options. Falls back to
+                ``default_load_options`` when not provided.
+            order_by: Additional ordering applied after the cursor column.
+            items_per_page: Number of items per page (default 20).
+            search: Search query string or SearchConfig object.
+            search_fields: Fields to search in (overrides class default).
+            facet_fields: Columns to compute distinct values for (overrides class default).
+            filter_by: Dict of {column_key: value} to filter by declared facet fields.
+                Keys must match the column.key of a facet field. Scalar → equality,
+                list → IN clause. Raises InvalidFacetFilterError for unknown keys.
+            schema: Optional Pydantic schema to serialize each item into.
+
+        Returns:
+            PaginatedResponse with CursorPagination metadata
+        """
+        filters = list(filters) if filters else []
+
+        fb_filters, search_joins = cls._prepare_filter_by(filter_by, facet_fields)
+        filters.extend(fb_filters)
+
+        if cls.cursor_column is None:
+            raise ValueError(
+                f"{cls.__name__}.cursor_column is not set. "
+                "Pass cursor_column=<column> to CrudFactory() to use cursor_paginate."
+            )
+        cursor_column: Any = cls.cursor_column
+        cursor_col_name: str = cursor_column.key
+
+        if cursor is not None:
+            raw_val = _decode_cursor(cursor)
+            col_type = cursor_column.property.columns[0].type
+            if isinstance(col_type, Integer):
+                cursor_val: Any = int(raw_val)
+            elif isinstance(col_type, Uuid):
+                cursor_val = uuid_module.UUID(raw_val)
+            elif isinstance(col_type, DateTime):
+                cursor_val = datetime.fromisoformat(raw_val)
+            elif isinstance(col_type, Date):
+                cursor_val = date.fromisoformat(raw_val)
+            elif isinstance(col_type, (Float, Numeric)):
+                cursor_val = Decimal(raw_val)
+            else:
+                raise ValueError(
+                    f"Unsupported cursor column type: {type(col_type).__name__!r}. "
+                    "Supported types: Integer, BigInteger, SmallInteger, Uuid, "
+                    "DateTime, Date, Float, Numeric."
+                )
+            filters.append(cursor_column > cursor_val)
+
+        # Build search filters
+        if search:
+            search_filters, new_search_joins = build_search_filters(
+                cls.model,
+                search,
+                search_fields=search_fields,
+                default_fields=cls.searchable_fields,
+            )
+            filters.extend(search_filters)
+            search_joins.extend(new_search_joins)
+
+        # Build query
+        q = select(cls.model)
+
+        # Apply explicit joins
+        q = _apply_joins(q, joins, outer_join)
+
+        # Apply search joins (always outer joins)
+        q = _apply_search_joins(q, search_joins)
+
+        if filters:
+            q = q.where(and_(*filters))
+        if resolved := cls._resolve_load_options(load_options):
+            q = q.options(*resolved)
+
+        # Cursor column is always the primary sort
+        q = q.order_by(cursor_column)
+        if order_by is not None:
+            q = q.order_by(order_by)
+
+        # Fetch one extra to detect whether a next page exists
+        q = q.limit(items_per_page + 1)
+        result = await session.execute(q)
+        raw_items = cast(list[ModelType], result.unique().scalars().all())
+
+        has_more = len(raw_items) > items_per_page
+        items_page = raw_items[:items_per_page]
+
+        # next_cursor points past the last item on this page
+        next_cursor: str | None = None
+        if has_more and items_page:
+            next_cursor = _encode_cursor(getattr(items_page[-1], cursor_col_name))
+
+        # prev_cursor points to the first item on this page or None when on the first page
+        prev_cursor: str | None = None
+        if cursor is not None and items_page:
+            prev_cursor = _encode_cursor(getattr(items_page[0], cursor_col_name))
+
+        items: list[Any] = [schema.model_validate(item) for item in items_page]
+
+        filter_attributes = await cls._build_filter_attributes(
+            session, facet_fields, filters, search_joins
+        )
+
+        return PaginatedResponse(
+            data=items,
+            pagination=CursorPagination(
+                next_cursor=next_cursor,
+                prev_cursor=prev_cursor,
+                items_per_page=items_per_page,
+                has_more=has_more,
+            ),
+            filter_attributes=filter_attributes,
         )
 
 
@@ -667,21 +990,39 @@ def CrudFactory(
     model: type[ModelType],
     *,
     searchable_fields: Sequence[SearchFieldType] | None = None,
+    facet_fields: Sequence[FacetFieldType] | None = None,
+    order_fields: Sequence[QueryableAttribute[Any]] | None = None,
     m2m_fields: M2MFieldType | None = None,
+    default_load_options: list[ExecutableOption] | None = None,
+    cursor_column: Any | None = None,
 ) -> type[AsyncCrud[ModelType]]:
     """Create a CRUD class for a specific model.
 
     Args:
         model: SQLAlchemy model class
         searchable_fields: Optional list of searchable fields
+        facet_fields: Optional list of columns to compute distinct values for in paginated
+            responses. Supports direct columns (``User.status``) and relationship tuples
+            (``(User.role, Role.name)``). Can be overridden per call.
+        order_fields: Optional list of model attributes that callers are allowed to order by
+            via ``order_params()``. Can be overridden per call.
         m2m_fields: Optional mapping for many-to-many relationships.
             Maps schema field names (containing lists of IDs) to
             SQLAlchemy relationship attributes.
+        default_load_options: Default SQLAlchemy loader options applied to all read
+            queries when no explicit ``load_options`` are passed. Use this
+            instead of ``lazy="selectin"`` on the model so that loading
+            strategy is explicit and per-CRUD. Overridden entirely (not
+            merged) when ``load_options`` is provided at call-site.
+        cursor_column: Required to call ``cursor_paginate``.
+            Must be monotonically ordered (e.g. integer PK, UUID v7, timestamp).
+            See the cursor pagination docs for supported column types.
 
     Returns:
         AsyncCrud subclass bound to the model
 
     Example:
+        ```python
         from fastapi_toolsets.crud import CrudFactory
         from myapp.models import User, Post
 
@@ -701,6 +1042,31 @@ def CrudFactory(
             m2m_fields={"tag_ids": Post.tags},
         )
 
+        # With facet fields for filter dropdowns / faceted search:
+        UserCrud = CrudFactory(
+            User,
+            facet_fields=[User.status, User.country, (User.role, Role.name)],
+        )
+
+        # With a fixed cursor column for cursor_paginate:
+        PostCrud = CrudFactory(
+            Post,
+            cursor_column=Post.created_at,
+        )
+
+        # With default load strategy (replaces lazy="selectin" on the model):
+        ArticleCrud = CrudFactory(
+            Article,
+            default_load_options=[selectinload(Article.category), selectinload(Article.tags)],
+        )
+
+        # Override default_load_options for a specific call:
+        article = await ArticleCrud.get(
+            session,
+            [Article.id == 1],
+            load_options=[selectinload(Article.category)],  # tags won't load
+        )
+
         # Usage
         user = await UserCrud.get(session, [User.id == 1])
         posts = await PostCrud.get_multi(session, filters=[Post.user_id == user.id])
@@ -709,7 +1075,7 @@ def CrudFactory(
         post = await PostCrud.create(session, PostCreate(title="Hello", tag_ids=[id1, id2]))
 
         # With search
-        result = await UserCrud.paginate(session, search="john")
+        result = await UserCrud.offset_paginate(session, search="john")
 
         # With joins (inner join by default):
         users = await UserCrud.get_multi(
@@ -724,6 +1090,7 @@ def CrudFactory(
             joins=[(Post, Post.user_id == User.id)],
             outer_join=True,
         )
+        ```
     """
     cls = type(
         f"Async{model.__name__}Crud",
@@ -731,7 +1098,11 @@ def CrudFactory(
         {
             "model": model,
             "searchable_fields": searchable_fields,
+            "facet_fields": facet_fields,
+            "order_fields": order_fields,
             "m2m_fields": m2m_fields,
+            "default_load_options": default_load_options,
+            "cursor_column": cursor_column,
         },
     )
     return cast(type[AsyncCrud[ModelType]], cls)

src/fastapi_toolsets/crud/search.py

@@ -1,20 +1,23 @@
 """Search utilities for AsyncCrud."""
 
+import asyncio
+import functools
+from collections import Counter
 from collections.abc import Sequence
-from dataclasses import dataclass
+from dataclasses import dataclass, replace
 from typing import TYPE_CHECKING, Any, Literal
 
-from sqlalchemy import String, or_
+from sqlalchemy import String, and_, 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
+from ..types import FacetFieldType, SearchFieldType
 
 if TYPE_CHECKING:
     from sqlalchemy.sql.elements import ColumnElement
 
-SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
-
 
 @dataclass
 class SearchConfig:
@@ -33,6 +36,7 @@ class SearchConfig:
     match_mode: Literal["any", "all"] = "any"
 
 
+@functools.lru_cache(maxsize=128)
 def get_searchable_fields(
     model: type[DeclarativeBase],
     *,
@@ -89,19 +93,19 @@ 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):
         config = SearchConfig(query=search, fields=search_fields)
     else:
-        config = search
-        if search_fields is not None:
-            config = SearchConfig(
-                query=config.query,
-                fields=search_fields,
-                case_sensitive=config.case_sensitive,
-                match_mode=config.match_mode,
-            )
+        config = (
+            replace(search, fields=search_fields)
+            if search_fields is not None
+            else search
+        )
 
     if not config.query or not config.query.strip():
         return [], []
@@ -136,7 +140,7 @@ 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 +148,143 @@ 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:
+            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

@@ -1,17 +1,16 @@
 """Dependency factories for FastAPI routes."""
 
 import inspect
-from collections.abc import AsyncGenerator, Callable
-from typing import Any, TypeVar, cast
+from collections.abc import Callable
+from typing import Any, cast
 
 from fastapi import Depends
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy.orm import DeclarativeBase
 
-from ..crud import CrudFactory
+from .crud import CrudFactory
+from .types import ModelType, SessionDependency
 
-ModelType = TypeVar("ModelType", bound=DeclarativeBase)
-SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]
+__all__ = ["BodyDependency", "PathDependency"]
 
 
 def PathDependency(
@@ -36,12 +35,14 @@ 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 +101,7 @@ 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 +110,7 @@ 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

@@ -10,6 +10,10 @@ from fastapi.responses import JSONResponse
 from ..schemas import ErrorResponse, ResponseStatus
 from .exceptions import ApiException
 
+_VALIDATION_LOCATION_PARAMS: frozenset[str] = frozenset(
+    {"body", "query", "path", "header", "cookie"}
+)
+
 
 def init_exceptions_handlers(app: FastAPI) -> FastAPI:
     """Register exception handlers and custom OpenAPI schema on a FastAPI app.
@@ -25,11 +29,13 @@ 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]
@@ -104,9 +110,7 @@ def _format_validation_error(
 
     for error in errors:
         field_path = ".".join(
-            str(loc)
-            for loc in error["loc"]
-            if loc not in ("body", "query", "path", "header", "cookie")
+            str(loc) for loc in error["loc"] if loc not in _VALIDATION_LOCATION_PARAMS
         )
         formatted_errors.append(
             {

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

@@ -1,24 +1,84 @@
 """Fixture loading utilities for database seeding."""
 
 from collections.abc import Callable, Sequence
-from typing import Any, TypeVar
+from typing import Any
 
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 
 from ..db import get_transaction
 from ..logger import get_logger
+from ..types import ModelType
 from .enum import LoadStrategy
 from .registry import Context, FixtureRegistry
 
 logger = get_logger()
 
-T = TypeVar("T", bound=DeclarativeBase)
+
+async def _load_ordered(
+    session: AsyncSession,
+    registry: FixtureRegistry,
+    ordered_names: list[str],
+    strategy: LoadStrategy,
+) -> dict[str, list[DeclarativeBase]]:
+    """Load fixtures in order."""
+    results: dict[str, list[DeclarativeBase]] = {}
+
+    for name in ordered_names:
+        fixture = registry.get(name)
+        instances = list(fixture.func())
+
+        if not instances:
+            results[name] = []
+            continue
+
+        model_name = type(instances[0]).__name__
+        loaded: list[DeclarativeBase] = []
+
+        async with get_transaction(session):
+            for instance in instances:
+                if strategy == LoadStrategy.INSERT:
+                    session.add(instance)
+                    loaded.append(instance)
+
+                elif strategy == LoadStrategy.MERGE:
+                    merged = await session.merge(instance)
+                    loaded.append(merged)
+
+                else:  # LoadStrategy.SKIP_EXISTING
+                    pk = _get_primary_key(instance)
+                    if pk is not None:
+                        existing = await session.get(type(instance), pk)
+                        if existing is None:
+                            session.add(instance)
+                            loaded.append(instance)
+                    else:
+                        session.add(instance)
+                        loaded.append(instance)
+
+        results[name] = loaded
+        logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
+
+    return results
+
+
+def _get_primary_key(instance: DeclarativeBase) -> Any | None:
+    """Get the primary key value of a model instance."""
+    mapper = instance.__class__.__mapper__
+    pk_cols = mapper.primary_key
+
+    if len(pk_cols) == 1:
+        return getattr(instance, pk_cols[0].name, None)
+
+    pk_values = tuple(getattr(instance, col.name, None) for col in pk_cols)
+    if all(v is not None for v in pk_values):
+        return pk_values
+    return None
 
 
 def get_obj_by_attr(
-    fixtures: Callable[[], Sequence[T]], attr_name: str, value: Any
-) -> T:
+    fixtures: Callable[[], Sequence[ModelType]], attr_name: str, value: Any
+) -> ModelType:
     """Get a SQLAlchemy model instance by matching an attribute value.
 
     Args:
@@ -57,11 +117,6 @@ async def load_fixtures(
 
     Returns:
         Dict mapping fixture names to loaded instances
-
-    Example:
-        # 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)
@@ -83,74 +138,6 @@ async def load_fixtures_by_context(
 
     Returns:
         Dict mapping fixture names to loaded instances
-
-    Example:
-        # 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)
-
-
-async def _load_ordered(
-    session: AsyncSession,
-    registry: FixtureRegistry,
-    ordered_names: list[str],
-    strategy: LoadStrategy,
-) -> dict[str, list[DeclarativeBase]]:
-    """Load fixtures in order."""
-    results: dict[str, list[DeclarativeBase]] = {}
-
-    for name in ordered_names:
-        fixture = registry.get(name)
-        instances = list(fixture.func())
-
-        if not instances:
-            results[name] = []
-            continue
-
-        model_name = type(instances[0]).__name__
-        loaded: list[DeclarativeBase] = []
-
-        async with get_transaction(session):
-            for instance in instances:
-                if strategy == LoadStrategy.INSERT:
-                    session.add(instance)
-                    loaded.append(instance)
-
-                elif strategy == LoadStrategy.MERGE:
-                    merged = await session.merge(instance)
-                    loaded.append(merged)
-
-                elif strategy == LoadStrategy.SKIP_EXISTING:
-                    pk = _get_primary_key(instance)
-                    if pk is not None:
-                        existing = await session.get(type(instance), pk)
-                        if existing is None:
-                            session.add(instance)
-                            loaded.append(instance)
-                    else:
-                        session.add(instance)
-                        loaded.append(instance)
-
-        results[name] = loaded
-        logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
-
-    return results
-
-
-def _get_primary_key(instance: DeclarativeBase) -> Any | None:
-    """Get the primary key value of a model instance."""
-    mapper = instance.__class__.__mapper__
-    pk_cols = mapper.primary_key
-
-    if len(pk_cols) == 1:
-        return getattr(instance, pk_cols[0].name, None)
-
-    pk_values = tuple(getattr(instance, col.name, None) for col in pk_cols)
-    if all(v is not None for v in pk_values):
-        return pk_values
-    return None

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

@@ -1,8 +1,19 @@
 """Prometheus metrics integration for FastAPI applications."""
 
-from .handler import init_metrics
+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",

src/fastapi_toolsets/metrics/handler.py

@@ -40,28 +40,36 @@ def init_metrics(
         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()
+    # Partition collectors and cache env check at startup — both are stable for the app lifetime.
+    async_collectors = [
+        c for c in registry.get_collectors() if asyncio.iscoroutinefunction(c.func)
+    ]
+    sync_collectors = [
+        c for c in registry.get_collectors() if not asyncio.iscoroutinefunction(c.func)
+    ]
+    multiprocess_mode = _is_multiprocess()
 
     @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()
+        for collector in sync_collectors:
+            collector.func()
+        for collector in async_collectors:
+            await collector.func()
 
-        if _is_multiprocess():
+        if multiprocess_mode:
             prom_registry = CollectorRegistry()
             multiprocess.MultiProcessCollector(prom_registry)
             output = generate_latest(prom_registry)

src/fastapi_toolsets/metrics/registry.py

@@ -22,6 +22,7 @@ class MetricsRegistry:
     """Registry for managing Prometheus metric providers and collectors.
 
     Example:
+        ```python
         from prometheus_client import Counter, Gauge
         from fastapi_toolsets.metrics import MetricsRegistry
 
@@ -38,6 +39,7 @@ class MetricsRegistry:
         @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:
@@ -61,6 +63,7 @@ class MetricsRegistry:
                 If ``False`` (default), called once at init time.
 
         Example:
+            ```python
             @metrics.register
             def my_counter():
                 return Counter("my_counter", "A counter")
@@ -68,6 +71,7 @@ class MetricsRegistry:
             @metrics.register(collect=True, name="queue")
             def collect_queue_depth():
                 gauge.set(compute_depth())
+            ```
         """
 
         def decorator(fn: Callable[..., Any]) -> Callable[..., Any]:
@@ -93,6 +97,7 @@ class MetricsRegistry:
             ValueError: If a metric name already exists in the current registry.
 
         Example:
+            ```python
             main = MetricsRegistry()
             sub = MetricsRegistry()
 
@@ -101,6 +106,7 @@ class MetricsRegistry:
                 return Counter("sub_total", "Sub counter")
 
             main.include_registry(sub)
+            ```
         """
         for metric_name, definition in registry._metrics.items():
             if metric_name in self._metrics:

src/fastapi_toolsets/pytest/__init__.py

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

@@ -1,22 +1,23 @@
 """Base Pydantic schemas for API responses."""
 
 from enum import Enum
-from typing import Any, ClassVar, Generic, TypeVar
+from typing import Any, ClassVar, Generic
 
 from pydantic import BaseModel, ConfigDict
 
+from .types import DataT
+
 __all__ = [
     "ApiError",
+    "CursorPagination",
     "ErrorResponse",
-    "Pagination",
+    "OffsetPagination",
     "PaginatedResponse",
     "PydanticBase",
     "Response",
     "ResponseStatus",
 ]
 
-DataT = TypeVar("DataT")
-
 
 class PydanticBase(BaseModel):
     """Base class for all Pydantic models with common configuration."""
@@ -71,7 +72,9 @@ 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 +91,8 @@ class ErrorResponse(BaseResponse):
     data: Any | None = None
 
 
-class Pagination(PydanticBase):
-    """Pagination metadata for list responses.
+class OffsetPagination(PydanticBase):
+    """Pagination metadata for offset-based list responses.
 
     Attributes:
         total_count: Total number of items across all pages
@@ -104,15 +107,25 @@ class Pagination(PydanticBase):
     has_more: bool
 
 
-class PaginatedResponse(BaseResponse, Generic[DataT]):
-    """Paginated API response for list endpoints.
+class CursorPagination(PydanticBase):
+    """Pagination metadata for cursor-based list responses.
 
-    Example:
-        PaginatedResponse[UserRead](
-            data=users,
-            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

src/fastapi_toolsets/types.py

@@ -0,0 +1,27 @@
+"""Shared type aliases for the fastapi-toolsets package."""
+
+from collections.abc import AsyncGenerator, Callable, Mapping
+from typing import Any, TypeVar
+
+from pydantic import BaseModel
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import DeclarativeBase, QueryableAttribute
+from sqlalchemy.orm.attributes import InstrumentedAttribute
+from sqlalchemy.sql.elements import ColumnElement
+
+# Generic TypeVars
+DataT = TypeVar("DataT")
+ModelType = TypeVar("ModelType", bound=DeclarativeBase)
+SchemaType = TypeVar("SchemaType", bound=BaseModel)
+
+# CRUD type aliases
+JoinType = list[tuple[type[DeclarativeBase], Any]]
+M2MFieldType = Mapping[str, QueryableAttribute[Any]]
+OrderByClause = ColumnElement[Any] | QueryableAttribute[Any]
+
+# Search / facet type aliases
+SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
+FacetFieldType = SearchFieldType
+
+# Dependency type aliases
+SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]

tests/conftest.py

@@ -5,24 +5,32 @@ import uuid
 
 import pytest
 from pydantic import BaseModel
-from sqlalchemy import Column, ForeignKey, String, Table, 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") or os.getenv(
-    "TEST_DATABASE_URL",
-    "postgresql+asyncpg://postgres:postgres@localhost:5432/fastapi_toolsets_test",
+DATABASE_URL = os.getenv(
+    key="DATABASE_URL",
+    default="postgresql+asyncpg://postgres:postgres@localhost:5432/postgres",
 )
 
 
-# =============================================================================
-# Test Models
-# =============================================================================
-
-
 class Base(DeclarativeBase):
     """Base class for test models."""
 
@@ -75,6 +83,45 @@ post_tags = Table(
 )
 
 
+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 Permission(Base):
+    """Test model with composite primary key."""
+
+    __tablename__ = "permissions"
+
+    subject: Mapped[str] = mapped_column(String(50), primary_key=True)
+    action: Mapped[str] = mapped_column(String(50), primary_key=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."""
 
@@ -89,11 +136,6 @@ class Post(Base):
     tags: Mapped[list[Tag]] = relationship(secondary=post_tags)
 
 
-# =============================================================================
-# Test Schemas
-# =============================================================================
-
-
 class RoleCreate(BaseModel):
     """Schema for creating a role."""
 
@@ -101,6 +143,13 @@ 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."""
 
@@ -117,6 +166,14 @@ 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
+    is_active: bool = True
+
+
 class UserUpdate(BaseModel):
     """Schema for updating a user."""
 
@@ -171,20 +228,61 @@ class PostM2MUpdate(BaseModel):
     tag_ids: list[uuid.UUID] | None = None
 
 
-# =============================================================================
-# CRUD Classes
-# =============================================================================
+class IntRoleRead(PydanticBase):
+    """Schema for reading an IntRole."""
+
+    id: int
+    name: str
+
+
+class IntRoleCreate(BaseModel):
+    """Schema for creating an IntRole."""
+
+    name: str
+
+
+class EventRead(PydanticBase):
+    """Schema for reading an Event."""
+
+    id: uuid.UUID
+    name: str
+
+
+class EventCreate(BaseModel):
+    """Schema for creating an Event."""
+
+    name: str
+    occurred_at: datetime.datetime
+    scheduled_date: datetime.date
+
+
+class ProductRead(PydanticBase):
+    """Schema for reading a Product."""
+
+    id: uuid.UUID
+    name: str
+
+
+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})
-
-
-# =============================================================================
-# Fixtures
-# =============================================================================
+EventCrud = CrudFactory(Event)
+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_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_fixtures.py

@@ -14,7 +14,9 @@ from fastapi_toolsets.fixtures import (
     load_fixtures_by_context,
 )
 
-from .conftest import Role, User
+from fastapi_toolsets.fixtures.utils import _get_primary_key
+
+from .conftest import IntRole, Permission, Role, User
 
 
 class TestContext:
@@ -597,6 +599,46 @@ class TestLoadFixtures:
         count = await RoleCrud.count(db_session)
         assert count == 2
 
+    @pytest.mark.anyio
+    async def test_skip_existing_skips_if_record_exists(self, db_session: AsyncSession):
+        """SKIP_EXISTING returns empty loaded list when the record already exists."""
+        registry = FixtureRegistry()
+        role_id = uuid.uuid4()
+
+        @registry.register
+        def roles():
+            return [Role(id=role_id, name="admin")]
+
+        # First load — inserts the record.
+        result1 = await load_fixtures(
+            db_session, registry, "roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert len(result1["roles"]) == 1
+
+        # Remove from identity map so session.get() queries the DB in the second load.
+        db_session.expunge_all()
+
+        # Second load — record exists in DB, nothing should be added.
+        result2 = await load_fixtures(
+            db_session, registry, "roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert result2["roles"] == []
+
+    @pytest.mark.anyio
+    async def test_skip_existing_null_pk_inserts(self, db_session: AsyncSession):
+        """SKIP_EXISTING inserts when the instance has no PK set (auto-increment)."""
+        registry = FixtureRegistry()
+
+        @registry.register
+        def int_roles():
+            # No id provided — PK is None before INSERT (autoincrement).
+            return [IntRole(name="member")]
+
+        result = await load_fixtures(
+            db_session, registry, "int_roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert len(result["int_roles"]) == 1
+
 
 class TestLoadFixturesByContext:
     """Tests for load_fixtures_by_context function."""
@@ -755,3 +797,19 @@ class TestGetObjByAttr:
         """Raises StopIteration when value type doesn't match."""
         with pytest.raises(StopIteration):
             get_obj_by_attr(self.roles, "id", "not-a-uuid")
+
+
+class TestGetPrimaryKey:
+    """Unit tests for the _get_primary_key helper (composite PK paths)."""
+
+    def test_composite_pk_all_set(self):
+        """Returns a tuple when all composite PK values are set."""
+        instance = Permission(subject="post", action="read")
+        pk = _get_primary_key(instance)
+        assert pk == ("post", "read")
+
+    def test_composite_pk_partial_none(self):
+        """Returns None when any composite PK value is None."""
+        instance = Permission(subject="post")  # action is None
+        pk = _get_primary_key(instance)
+        assert pk is None

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_schemas.py

@@ -5,9 +5,10 @@ from pydantic import ValidationError
 
 from fastapi_toolsets.schemas import (
     ApiError,
+    CursorPagination,
     ErrorResponse,
+    OffsetPagination,
     PaginatedResponse,
-    Pagination,
     Response,
     ResponseStatus,
 )
@@ -154,12 +155,12 @@ class TestErrorResponse:
         assert data["description"] == "Details"
 
 
-class TestPagination:
-    """Tests for Pagination schema."""
+class TestOffsetPagination:
+    """Tests for OffsetPagination schema (canonical name for offset-based pagination)."""
 
     def test_create_pagination(self):
-        """Create Pagination with all fields."""
-        pagination = Pagination(
+        """Create OffsetPagination with all fields."""
+        pagination = OffsetPagination(
             total_count=100,
             items_per_page=10,
             page=1,
@@ -173,7 +174,7 @@ 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 +184,8 @@ class TestPagination:
         assert pagination.has_more is False
 
     def test_serialization(self):
-        """Pagination serializes correctly."""
-        pagination = Pagination(
+        """OffsetPagination serializes correctly."""
+        pagination = OffsetPagination(
             total_count=50,
             items_per_page=20,
             page=2,
@@ -198,12 +199,69 @@ class TestPagination:
         assert data["has_more"] is True
 
 
+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."""
 
     def test_create_paginated_response(self):
         """Create PaginatedResponse with data and pagination."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=30,
             items_per_page=10,
             page=1,
@@ -214,13 +272,14 @@ 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
 
     def test_with_custom_message(self):
         """PaginatedResponse with custom message."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=5,
             items_per_page=10,
             page=1,
@@ -236,7 +295,7 @@ class TestPaginatedResponse:
 
     def test_empty_data(self):
         """PaginatedResponse with empty data."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=0,
             items_per_page=10,
             page=1,
@@ -247,6 +306,7 @@ class TestPaginatedResponse:
             pagination=pagination,
         )
 
+        assert isinstance(response.pagination, OffsetPagination)
         assert response.data == []
         assert response.pagination.total_count == 0
 
@@ -257,7 +317,7 @@ class TestPaginatedResponse:
             id: int
             name: str
 
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=1,
             items_per_page=10,
             page=1,
@@ -272,7 +332,7 @@ class TestPaginatedResponse:
 
     def test_serialization(self):
         """PaginatedResponse serializes correctly."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=100,
             items_per_page=10,
             page=5,
@@ -290,6 +350,26 @@ 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)
+
 
 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" },
@@ -235,40 +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 = "0.10.0"
+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 = "prometheus-client" },
+    { 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" },
 ]
-metrics = [
-    { name = "prometheus-client" },
+docs = [
+    { name = "mkdocstrings-python" },
+    { name = "zensical" },
 ]
-test = [
+tests = [
     { name = "coverage" },
+    { name = "httpx" },
     { name = "pytest" },
     { name = "pytest-anyio" },
     { name = "pytest-cov" },
@@ -278,22 +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 = ["metrics", "test"], marker = "extra == 'dev'" },
-    { name = "httpx", specifier = ">=0.25.0" },
+    { name = "fastapi-toolsets", extras = ["cli", "metrics", "pytest"], marker = "extra == 'all'" },
+    { 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-anyio", marker = "extra == 'test'", specifier = ">=0.0.0" },
-    { 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" },
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+
+[project.markdown_extensions."toc"]
+permalink = true
+
+[project.markdown_extensions."pymdownx.snippets"]
+base_path = ["."]
+check_paths = true