feat(mes): add task assignee implementation

hsy

2026-08-18 56e8a8e8f6c90faf8240a5a05d64a6da441888ab

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DELETE FROM trade_order;
DELETE FROM trade_order_item;
DELETE FROM trade_after_sale;
DELETE FROM trade_after_sale_log;
DELETE FROM trade_brokerage_user;
DELETE FROM trade_brokerage_record;
DELETE FROM "trade_brokerage_withdraw";