Python logging with structlog in production

# app/logging.py
import structlog
import logging
import sys

def configure_logging(debug: bool = False) -> None:
    shared_processors = [
        structlog.contextvars.merge_contextvars,  # Merge bound context
        structlog.processors.add_log_level,
        structlog.processors.TimeStamper(fmt='iso', utc=True),
        structlog.stdlib.add_logger_name,
    ]

    if debug:
        # Human-readable in development
        processors = shared_processors + [
            structlog.dev.ConsoleRenderer()
        ]
    else:
        # JSON in production
        processors = shared_processors + [
            structlog.processors.dict_tracebacks,
            structlog.processors.JSONRenderer(),
        ]

    structlog.configure(
        processors=processors,
        wrapper_class=structlog.make_filtering_bound_logger(logging.DEBUG if debug else logging.INFO),
        context_class=dict,
        logger_factory=structlog.PrintLoggerFactory(file=sys.stdout),
        cache_logger_on_first_use=True,
    )

# Usage in FastAPI middleware — bind request context
from starlette.middleware.base import BaseHTTPMiddleware
import uuid

class RequestLoggingMiddleware(BaseHTTPMiddleware):
    async def dispatch(self, request, call_next):
        request_id = str(uuid.uuid4())[:8]
        structlog.contextvars.clear_contextvars()
        structlog.contextvars.bind_contextvars(
            request_id=request_id,
            method=request.method,
            path=request.url.path,
        )

        logger = structlog.get_logger()
        logger.info('request_started')
        response = await call_next(request)
        logger.info('request_completed', status_code=response.status_code)
        return response

# In route handlers
logger = structlog.get_logger()

async def create_trace(trace: TraceCreate, user: User) -> Trace:
    logger.info('creating_trace', user_id=str(user.id), title=trace.title)
    result = await db.insert(trace)
    logger.info('trace_created', trace_id=str(result.id))
    return result