first commit

app/middleware/request_id.py

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+from uuid import uuid4
+
+from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.requests import Request
+
+
+class RequestIdMiddleware(BaseHTTPMiddleware):
+    async def dispatch(self, request: Request, call_next):
+        request_id = request.headers.get("X-Request-ID") or str(uuid4())
+        request.state.request_id = request_id
+        response = await call_next(request)
+        response.headers["X-Request-ID"] = request_id
+        return response