fix: 完成商务迁移复核与接口优化并清理历史资料

internal/data/business/server_report_index.go

@@ -0,0 +1,18 @@
+package business
+
+import "gorm.io/gorm"
+
+// 区服汇总按创角时间读取原始记录；旧表只有 play_time 索引，导致每日创角扫描全表。
+func migrateServerReportIndex(db *gorm.DB) error {
+	if db.Dialector.Name() != "mysql" || !db.Migrator().HasTable("tab_user_play_info") {
+		return nil
+	}
+	var existing int64
+	if err := db.Raw("SELECT COUNT(*) FROM information_schema.statistics WHERE table_schema=DATABASE() AND table_name='tab_user_play_info' AND column_name='create_time' AND seq_in_index=1").Scan(&existing).Error; err != nil {
+		return err
+	}
+	if existing > 0 {
+		return nil
+	}
+	return db.Exec("ALTER TABLE tab_user_play_info ADD INDEX idx_sw_play_create_time(create_time), ALGORITHM=INPLACE, LOCK=NONE").Error
+}