调整部分前端布局和后端增删改逻辑

shierfeng-fastapi-backend/utils/common_util.py

@@ -11,7 +11,6 @@ from openpyxl.utils import get_column_letter
 from openpyxl.worksheet.datavalidation import DataValidation
 from sqlalchemy.engine.row import Row
 from sqlalchemy.orm.collections import InstrumentedList
-from sqlalchemy.sql.expression import TextClause, null
 
 from config.database import Base
 from config.env import CachePathConfig
@@ -153,17 +152,14 @@ class SqlalchemyUtil:
         return result
 
     @classmethod
-    def get_server_default_null(cls, dialect_name: str, need_explicit_null: bool = True) -> TextClause | None:
+    def get_server_default_null(cls, dialect_name: str, need_explicit_null: bool = True) -> None:
         """
         根据数据库方言动态返回值为null的server_default
 
         :param dialect_name: 数据库方言名称
         :param need_explicit_null: 是否需要显式DEFAULT NULL
-        :return: 不同数据库方言对应的null_server_default
+        :return: MySQL 使用隐式 NULL，不设置显式默认值
         """
-        if need_explicit_null and dialect_name == 'postgresql':
-            return null()
-        return None
 
 
 class CamelCaseUtil: