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backend/scripts/add_delivery_tasks_perf_indexes.sql

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+-- /api/web/delivery-tasks 列表性能索引补强
+-- 目标查询特征：
+--   1) WHERE is_del=0 ORDER BY create_at DESC（默认列表）
+--   2) WHERE is_del=0 AND region_id=? AND status=? ORDER BY create_at DESC
+--   3) WHERE is_del=0 AND deliver_id=? ORDER BY create_at DESC
+--   4) 列表中按 task_id 聚合明细数量（biz_delivery_task_item）
+
+-- 1) 默认列表与时间倒序分页
+ALTER TABLE biz_delivery_task
+  ADD INDEX idx_dt_isdel_createat (is_del, create_at);
+
+-- 2) 区域 + 状态过滤场景
+ALTER TABLE biz_delivery_task
+  ADD INDEX idx_dt_isdel_region_status_createat (is_del, region_id, status, create_at);
+
+-- 3) 配送员维度过滤场景
+ALTER TABLE biz_delivery_task
+  ADD INDEX idx_dt_isdel_deliver_createat (is_del, deliver_id, create_at);
+
+-- 4) 供应商维度过滤场景（供应商端任务列表）
+ALTER TABLE biz_delivery_task
+  ADD INDEX idx_dt_isdel_supplier_createat (is_del, supplier_id, create_at);
+
+-- 5) 列表 itemCount 聚合：WHERE task_id IN (...) AND is_del=0 GROUP BY task_id
+ALTER TABLE biz_delivery_task_item
+  ADD INDEX idx_dti_task_isdel (task_id, is_del);