修改登录和基础功能样式，目前已经支持钉钉登录和自定义登录注册

config.py

@@ -1,6 +1,22 @@
 import os
+from datetime import timedelta
 
 class Config:
     SECRET_KEY = os.environ.get('SECRET_KEY') or 'hard_to_guess_string_for_flask_app'
     SQLALCHEMY_DATABASE_URI = 'sqlite:///question_collector.db'
-    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    SQLALCHEMY_ENGINE_OPTIONS = {
+        'connect_args': {'check_same_thread': False}
+    }
+
+# 设置 UTC+8 时区
+import pytz
+tz = pytz.timezone('Asia/Shanghai')
+
+def naive_now():
+    from datetime import datetime
+    return datetime.now(tz)
+
+def utc_now():
+    from datetime import datetime
+    return datetime.utcnow()