chore: add .gitignore, clean tracked junk files

app/utils/db_utils.py

@@ -3,6 +3,7 @@ import time
 from flask import current_app
 import logging
 from sqlalchemy.exc import SQLAlchemyError
+from sqlalchemy import text
 from scripts.models import db
 from collections import defaultdict
 
@@ -121,6 +122,44 @@ def clear_table_cache(table_name):
         if key in query_cache.access_times:
             del query_cache.access_times[key]
 
+# 数据库连接重试机制
+def retry_database_connection(db_instance, app, max_retries=10, retry_delay=5):
+    """
+    尝试连接数据库，在连接失败时进行重试
+    :param db_instance: SQLAlchemy数据库实例
+    :param app: Flask应用实例
+    :param max_retries: 最大重试次数
+    :param retry_delay: 重试间隔(秒)
+    :return: 连接成功返回True，失败返回False
+    """
+    import sqlalchemy.exc as sa_exc
+
+    for attempt in range(max_retries):
+        try:
+            app.logger.info(f"尝试连接数据库... (尝试 {attempt + 1}/{max_retries})")
+
+            # 使用with语句确保应用上下文正确
+            with app.app_context():
+                # 尝试建立连接 - SQLAlchemy 2.0 兼容方式
+                with db_instance.engine.connect() as connection:
+                    connection.execute(text("SELECT 1"))
+                    connection.commit()  # 确保事务提交
+
+            app.logger.info("数据库连接成功！")
+            return True
+
+        except (sa_exc.OperationalError, sa_exc.DatabaseError, Exception) as e:
+            app.logger.warning(f"数据库连接失败: {str(e)}")
+
+            if attempt < max_retries - 1:
+                app.logger.info(f"等待 {retry_delay} 秒后重试...")
+                time.sleep(retry_delay)
+            else:
+                app.logger.error(f"数据库连接失败，已重试 {max_retries} 次，放弃连接")
+                return False
+
+    return False
+
 # 通用查询函数，包含异常处理和缓存
 @db_operation()
 @cache_query()