Refa: link connector to KB. (#10991)

### What problem does this PR solve?

#10953

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/connector_app.py

@@ -40,9 +40,9 @@ def set_connector():
             "source": req["source"],
             "input_type": InputType.POLL,
             "config": req["config"],
-            "refresh_freq": int(req["refresh_freq"]),
-            "prune_freq": int(req["prune_freq"]),
-            "timeout_secs": int(req["timeout_secs"]),
+            "refresh_freq": int(req.get("refresh_freq", 30)),
+            "prune_freq": int(req.get("prune_freq", 720)),
+            "timeout_secs": int(req.get("timeout_secs", 60*29)),
             "status": TaskStatus.SCHEDULE
         }
         conn["status"] = TaskStatus.SCHEDULE