fix(events): keep registration status reads nonblocking

config/api_errors.py

@@ -0,0 +1,18 @@
+"""HTTP handling for recoverable database errors."""
+
+from django.http import JsonResponse
+
+
+def handle_database_operational_error(request, error):
+    """Return a retryable response when PostgreSQL rejects a lock wait."""
+    cause = error.__cause__
+    while cause is not None:
+        if getattr(cause, "sqlstate", None) == "55P03" or getattr(cause, "pgcode", None) == "55P03":
+            response = JsonResponse(
+                {"detail": "درخواست به‌دلیل شلوغی موقت پایگاه داده انجام نشد؛ کمی بعد دوباره تلاش کنید."},
+                status=503,
+            )
+            response["Retry-After"] = "2"
+            return response
+        cause = cause.__cause__
+    raise error