-- orders 表索引优化：提升 /api/orders 列表、营收统计查询性能
-- 执行：mysql -u user -p database < soul-api/scripts/add-orders-indexes.sql
-- 幂等：索引已存在时跳过，可重复执行

-- 1. idx_status_created 复合索引
SELECT COUNT(*) INTO @cnt FROM information_schema.statistics
WHERE table_schema = DATABASE() AND table_name = 'orders' AND index_name = 'idx_status_created';
SET @sql = IF(@cnt = 0, 'ALTER TABLE orders ADD INDEX idx_status_created (status, created_at)', 'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- 2. idx_user_id 索引
SELECT COUNT(*) INTO @cnt FROM information_schema.statistics
WHERE table_schema = DATABASE() AND table_name = 'orders' AND index_name = 'idx_user_id';
SET @sql = IF(@cnt = 0, 'ALTER TABLE orders ADD INDEX idx_user_id (user_id)', 'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;