fix: backend_accounting monkey-patch _get_db to use initialized DBPools instance

bin/backend_accounting.py

@@ -29,7 +29,10 @@ from product_management import get_manager
 # 初始化配置
 p = ProgramPath()
 config = getConfig(NS={'workdir': os.getcwd(), 'ProgramPath': p})
-DBPools(config.databases)
+db = DBPools(config.databases)
+# 防止 businessdate._get_db() 创建新的空 DBPools 实例
+import appbase.businessdate as _bd
+_bd._get_db = lambda: db
 
 def get_module_dbname(m):
 	return 'sage'