add migration

models/migrations/migrations.go

@@ -236,6 +236,8 @@ var migrations = []Migration{
 	NewMigration("add original author/url migration info to issues, comments, and repo ", addOriginalMigrationInfo),
 	// v90 -> v91
 	NewMigration("change length of some repository columns", changeSomeColumnsLengthOfRepo),
+	// v91 -> v92
+	NewMigration("add index on owner_id of repository and type, review_id of comment", addIndexOnRepositoryAndComment),
 }
 
 // Migrate database to current version

models/migrations/v91.go

@@ -0,0 +1,26 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import "github.com/go-xorm/xorm"
+
+func addIndexOnRepositoryAndComment(x *xorm.Engine) error {
+	type Repository struct {
+		ID      int64 `xorm:"pk autoincr"`
+		OwnerID int64 `xorm:"index"`
+	}
+
+	if err := x.Sync2(new(Repository)); err != nil {
+		return err
+	}
+
+	type Comment struct {
+		ID       int64 `xorm:"pk autoincr"`
+		Type     int   `xorm:"index"`
+		ReviewID int64 `xorm:"index"`
+	}
+
+	return x.Sync2(new(Comment))
+}