fix database insert and validation

backend/src/utilities/database.py

@@ -27,6 +27,7 @@ def _db_text(value: Any) -> Any:
 
 def _serialize_row_for_broadcast(row: Dict[str, Any]) -> Dict[str, Any]:
     serialized = dict(row)
+    _normalize_json_fields(serialized)
 
     raw_val = serialized.get("raw")
     if isinstance(raw_val, (bytes, bytearray)):
@@ -40,6 +41,18 @@ def _serialize_row_for_broadcast(row: Dict[str, Any]) -> Dict[str, Any]:
     return serialized
 
 
+def _normalize_json_fields(payload: Dict[str, Any]) -> None:
+    for key in ("dpi_metadata", "telemetry_metadata"):
+        value = payload.get(key)
+        if isinstance(value, str):
+            try:
+                parsed = json.loads(value)
+            except json.JSONDecodeError:
+                continue
+            if isinstance(parsed, dict):
+                payload[key] = parsed
+
+
 class DatabasePool:
     """Asyncpg connection pool wrapper used by the packet APIs."""
 
@@ -239,6 +252,7 @@ class DatabasePool:
         result: List[PacketDBModel] = []
         for row in rows:
             data = dict(row)
+            _normalize_json_fields(data)
 
             raw_val = data.get("raw")
             if isinstance(raw_val, (bytes, bytearray)):