fix: 消除游戏下拉重复请求并优化申请范围查询

internal/data/business/approved_games.go

@@ -19,10 +19,18 @@ func approvedGamesAvailable(db *gorm.DB) (bool, error) {
 // 用平台和 ID 配对，避免同号游戏或其他商务的申请扩大可选范围。
 func approvedGamesQuery(db *gorm.DB, viewer business.UserScope, sources []string) *gorm.DB {
 	promotes := ledgerBasePromotes(db, business.LedgerScope{Viewer: viewer, IncludeSub: true, Unrestricted: viewer.All}, business.LedgerFilter{Sources: sources}, "approved_p").Select("approved_p.source_db,approved_p.id")
-	applications := db.Table("tab_promote_apply a").Select("a.source_db,a.game_id").Where("a.status=1").Where("(a.source_db,a.promote_id) IN (?)", promotes)
-	q := db.Table("tab_game g").Where("(g.source_db,g.id) IN (?)", applications)
+	// 逐个游戏检查有效申请，命中即停止；非相关 IN 在 MySQL 5.7 会先
+	// 物化整张百万级申请表，即使下拉只需要前 50 项也要扫描全部申请。
+	applications := db.Table("tab_promote_apply a").Select("1").Where("a.source_db=g.source_db AND a.game_id=g.id AND a.status=1").Where("(a.source_db,a.promote_id) IN (?)", promotes)
+	q := db.Table("tab_game g").Where("EXISTS (?)", applications)
 	if len(sources) > 0 {
 		q = q.Where("g.source_db IN ?", sources)
 	}
 	return q
 }
+
+func migrateApprovedGameIndexes(db *gorm.DB) error {
+	return migrateQueryIndexes(db, []businessQueryIndex{
+		{"tab_promote_apply", "idx_sw_apply_game_scope", []string{"game_id", "source_db", "status", "promote_id"}},
+	})
+}