feat: [backend] vision support (#1510)

Co-authored-by: Garfield Dai <dai.hai@foxmail.com>

api/controllers/console/datasets/data_source.py

@@ -1,7 +1,6 @@
 import datetime
 import json
 
-from cachetools import TTLCache
 from flask import request
 from flask_login import current_user
 from libs.login import login_required
@@ -20,8 +19,6 @@ from models.source import DataSourceBinding
 from services.dataset_service import DatasetService, DocumentService
 from tasks.document_indexing_sync_task import document_indexing_sync_task
 
-cache = TTLCache(maxsize=None, ttl=30)
-
 
 class DataSourceApi(Resource):