---
description: Rules for API layer (FastAPI endpoints)
globs: main.py
alwaysApply: true
---

# Rules for API Layer (main.py)

## General Structure

The API layer is located in `main.py` and uses FastAPI.

## Principles

1. **Thin layer**: API must not contain business logic
2. **Validation**: Use Pydantic models for request validation
3. **Error handling**: Convert exceptions to HTTP status codes
4. **Documentation**: All endpoints must be documented

## Endpoint Structure

### Pydantic Models
- Create separate models for requests (`SearchRequest`, `UpdateRequest`)
- Create separate models for responses (`SearchResponse`, `UpdateResponse`)
- Use `Field` for field descriptions
- Use `field_validator` for custom validation

### Request Processing
- Always validate input data through Pydantic
- Handle errors and return clear HTTP status codes

## Endpoints

... список эндпоинтов с указанием методов и для чего они нужны...

## Error Handling

### HTTP Status Codes
- `200` - successful request
- `400` - validation error or invalid request
- `404` - resource not found
- `500` - internal server error
- `503` - service not initialized

### Error Messages
- Always include detailed error description
- Specify what exactly was not found

## References

@architecture.mdc