Add request/response logging with correlation IDs

[Asi0Flammeus]

Description

The API lacks comprehensive logging and request tracking, making debugging and monitoring difficult.

Problems

• No correlation IDs to track requests across operations
• Missing structured logging for API operations
• Difficult to trace issues through async operations
• No request/response logging for debugging

Requirements

• Add correlation ID generation for each request
• Implement structured logging with consistent format
• Log request/response details (sanitized for security)
• Add correlation ID to error responses
• Include timing information in logs
• Add log levels for different severity

Implementation

import uuid
from fastapi import Request

@app.middleware("http")
async def add_correlation_id(request: Request, call_next):
    correlation_id = str(uuid.uuid4())
    request.state.correlation_id = correlation_id
    # Add to logs and response headers

Acceptance Criteria

• Every request gets a unique correlation ID
• Structured logging throughout the application
• Correlation IDs in error responses and logs
• Request timing information logged
• Sensitive data excluded from logs

Related

• Monitoring improvement from PR Create API endpoints for contribute app #22 review
• Enables better debugging and observability

Priority

Medium - Operational improvement