fix: enforce Beijing Time (UTC+8) globally by replacing datetime.utcnow

inventory-backend/app/api/v1/inbound/base.py

@@ -1,7 +1,7 @@
 # 文件路径: app/api/v1/inbound/base.py
 
 from flask import Blueprint, request, jsonify, send_file, g, current_app
-from app.extensions import db
+from app.extensions import db, beijing_time
 from app.services.inbound.base_service import MaterialBaseService
 from app.utils.decorators import login_required, permission_required, audit_log
 from app.models.base import MaterialBase, MaterialWarningSetting
@@ -185,9 +185,8 @@ def export_data():
         file_stream = MaterialBaseService.export_excel(filters, user_permissions)
 
         # 生成文件名：库存统计+年月日+时分秒 (北京时间 UTC+8)
-        # 简单处理：UTC时间 + 8小时
-        beijing_time = datetime.datetime.utcnow() + datetime.timedelta(hours=8)
-        filename = f"库存统计_{beijing_time.strftime('%Y%m%d_%H%M%S')}.xlsx"
+        bj_time = beijing_time()
+        filename = f"库存统计_{bj_time.strftime('%Y%m%d_%H%M%S')}.xlsx"
 
         # 发送文件
         # 注意：download_name 仅在较新 Flask 版本有效，旧版本可能需要手动 header，

inventory-backend/app/api/v1/stock/adjustment.py

@@ -2,7 +2,7 @@
 from flask import Blueprint, request, jsonify
 from flask_jwt_extended import jwt_required, get_jwt_identity, get_jwt
 from app.utils.decorators import permission_required
-from app.extensions import db
+from app.extensions import db, beijing_time
 from app.models.stock.adjustment import StockAdjustment
 from app.models.base import MaterialBase
 from app.models.inbound.buy import StockBuy
@@ -17,7 +17,7 @@ adjustment_bp = Blueprint('adjustment', __name__, url_prefix='/stock/adjustment'
 
 def get_beijing_time():
     """获取北京时间 (UTC+8)"""
-    return datetime.utcnow() + timedelta(hours=8)
+    return beijing_time()
 
 
 def generate_order_no():

inventory-backend/app/extensions.py

@@ -16,8 +16,8 @@ redis_client = None
 
 
 def beijing_time():
-    """获取北京时间 (UTC+8)"""
-    return datetime.now(timezone(timedelta(hours=8)))
+    """获取北京时间 (UTC+8)，剥离时区信息以兼容数据库 naive DateTime 字段"""
+    return datetime.now(timezone(timedelta(hours=8))).replace(tzinfo=None)
 
 
 # 2. 定义初始化函数 (供工厂函数 create_app 调用)