Clean up

backend/src/life_towers/main.py

@@ -1,8 +1,5 @@
-"""ASGI app, lifespan, static files mount, route registration."""
-
 from __future__ import annotations
 
-import json
 import os
 from contextlib import asynccontextmanager
 from html import escape
@@ -37,7 +34,6 @@ STATUS_CODE_MAP: dict[int, str] = {
     413: "payload_too_large",
     422: "bad_request",
     429: "rate_limited",
-    507: "quota_exceeded",
     500: "server_error",
 }
 
@@ -94,7 +90,12 @@ def create_app() -> FastAPI:
         request: Request, exc: RequestValidationError
     ) -> JSONResponse:
         fields = sorted(
-            {".".join(str(loc) for loc in e.get("loc", ()) if loc != "body") for e in exc.errors()}
+            field
+            for field in {
+                ".".join(str(loc) for loc in e.get("loc", ()) if loc != "body")
+                for e in exc.errors()
+            }
+            if field
         )
         if fields:
             detail_str = "Validation failed for: " + ", ".join(f for f in fields if f)