Fit a lot of encodings for text file. (#458)

### What problem does this PR solve?

#384

### Type of change

- [x] Performance Improvement

rag/svr/task_broker.py

@@ -121,6 +121,7 @@ def dispatch():
                 tsks.append(new_task())
 
             bulk_insert_into_db(Task, tsks, True)
+            print("TSK:", len(tsks))
             set_dispatching(r["id"])
         except Exception as e:
             cron_logger.exception(e)