perf(chat): 优化后台客服会话查询与状态

2026-08-25 15:53:10 +08:00
parent 87327fbd91
commit 417f7398e4
14 changed files with 461 additions and 141 deletions
@@ -0,0 +1,67 @@
+-- +goose Up
+-- +goose StatementBegin
+
+CREATE TABLE IF NOT EXISTS chat_admin_conversation_states (
+  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
+  conversation_id BIGINT UNSIGNED NOT NULL COMMENT '会话ID',
+  admin_user_id BIGINT UNSIGNED NOT NULL COMMENT '管理员ID',
+  remark VARCHAR(128) NOT NULL DEFAULT '' COMMENT '管理员个人备注',
+  last_read_message_id BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT '最后已读消息ID',
+  last_read_at DATETIME NULL COMMENT '最后已读时间',
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  UNIQUE KEY uk_chat_admin_conversation_state (conversation_id, admin_user_id),
+  KEY idx_chat_admin_state_admin (admin_user_id, conversation_id),
+  KEY idx_chat_admin_state_read (admin_user_id, last_read_message_id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='管理员会话个人状态';
+
+INSERT INTO chat_admin_conversation_states (
+  conversation_id, admin_user_id, remark, last_read_message_id, last_read_at
+)
+SELECT
+  cp.conversation_id,
+  cp.participant_id,
+  cp.remark,
+  COALESCE((
+    SELECT MAX(cm.id)
+    FROM chat_messages cm
+    WHERE cm.conversation_id = cp.conversation_id
+      AND cp.last_read_at IS NOT NULL
+      AND cm.created_at <= cp.last_read_at
+  ), 0),
+  cp.last_read_at
+FROM chat_participants cp
+WHERE cp.participant_type = 'admin'
+  AND (cp.remark <> '' OR cp.last_read_at IS NOT NULL)
+ON DUPLICATE KEY UPDATE
+  remark = VALUES(remark),
+  last_read_message_id = GREATEST(last_read_message_id, VALUES(last_read_message_id)),
+  last_read_at = CASE
+    WHEN last_read_at IS NULL THEN VALUES(last_read_at)
+    WHEN VALUES(last_read_at) IS NULL THEN last_read_at
+    ELSE GREATEST(last_read_at, VALUES(last_read_at))
+  END;
+
+ALTER TABLE chat_conversations
+  ADD INDEX idx_chat_conversations_status_activity (status, last_message_at, id),
+  ADD INDEX idx_chat_conversations_type_scene_activity (type, support_scene, last_message_at, id);
+
+-- 后台客服列表需要按商品快速定位最新订单，避免为每个会话执行全表排序。
+ALTER TABLE rental_orders
+  ADD INDEX idx_rental_orders_listing_id_id (listing_id, id);
+
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+
+ALTER TABLE rental_orders
+  DROP INDEX idx_rental_orders_listing_id_id;
+
+ALTER TABLE chat_conversations
+  DROP INDEX idx_chat_conversations_type_scene_activity,
+  DROP INDEX idx_chat_conversations_status_activity;
+
+DROP TABLE IF EXISTS chat_admin_conversation_states;
+
+-- +goose StatementEnd