feat: 实现单价分离、班级转课、消课筛选和手动录入功能

Coze-Commit-Type: user
Coze-User-ID: 3722323274763196
Coze-Conversation-ID: 5260473

xuexiao/app.py

@@ -11,13 +11,15 @@ def create_app():
     app.config.from_object(Config)
     app.config['TEMPLATES_AUTO_RELOAD'] = True
 
-    # 初始化数据库（复用 config 中预创建的 write_engine）
+    # 初始化数据库
     db.init_app(app)
-    if app in db._app_engines:
-        old_engine = db._app_engines[app].get(None)
-        if old_engine is not None and old_engine is not write_engine:
-            old_engine.dispose()
-        db._app_engines[app][None] = write_engine
+    # 仅当存在有效的 write_engine（非 None）时才复用
+    if write_engine is not None:
+        if app in db._app_engines:
+            old_engine = db._app_engines[app].get(None)
+            if old_engine is not None and old_engine is not write_engine:
+                old_engine.dispose()
+            db._app_engines[app][None] = write_engine
 
     # 注入模板上下文变量
     @app.context_processor