feat: Oracle Canvas Component Schema and Qwen 3.6 integration (#31)

Co-authored-by: Sagnik <sagnik7896@gmail.com>
Reviewed-on: #31

backend/oracle/action_service.py

@@ -17,8 +17,23 @@ except Exception:  # pragma: no cover
 _DB_URL = os.getenv("DATABASE_URL", "")
 
 
-def _now() -> str:
-    return datetime.now(timezone.utc).isoformat()
+def _now() -> datetime:
+    return datetime.now(timezone.utc)
+
+
+def _iso(value: datetime | None) -> str | None:
+    return value.isoformat() if value else None
+
+
+def _coerce_datetime(value: datetime | str | None) -> datetime | None:
+    if value is None or isinstance(value, datetime):
+        return value
+    if isinstance(value, str) and value.strip():
+        try:
+            return datetime.fromisoformat(value)
+        except ValueError:
+            return None
+    return None
 
 
 def _db_ready() -> bool:
@@ -314,8 +329,8 @@ class OracleActionService:
                 json.dumps(action.get("componentIds") or []),
                 json.dumps(action.get("writebackPayload") or {}),
                 json.dumps(action.get("resultPayload") or {}),
-                action["createdAt"],
-                action["updatedAt"],
+                _coerce_datetime(action["createdAt"]),
+                _coerce_datetime(action["updatedAt"]),
             )
         finally:
             await conn.close()
@@ -338,8 +353,8 @@ class OracleActionService:
             "componentIds": row["component_ids"] or [],
             "writebackPayload": row["writeback_payload"] or {},
             "resultPayload": row["result_payload"] or {},
-            "createdAt": row["created_at"].isoformat() if row["created_at"] else None,
-            "updatedAt": row["updated_at"].isoformat() if row["updated_at"] else None,
+            "createdAt": _iso(row["created_at"]),
+            "updatedAt": _iso(row["updated_at"]),
         }