Add user settings key/value DB table (#16834)

models/migrations/v202.go

@@ -0,0 +1,25 @@
+// Copyright 2021 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 (
+	"fmt"
+
+	"xorm.io/xorm"
+)
+
+func createUserSettingsTable(x *xorm.Engine) error {
+	type UserSetting struct {
+		ID           int64  `xorm:"pk autoincr"`
+		UserID       int64  `xorm:"index unique(key_userid)"`              // to load all of someone's settings
+		SettingKey   string `xorm:"varchar(255) index unique(key_userid)"` // ensure key is always lowercase
+		SettingValue string `xorm:"text"`
+	}
+	if err := x.Sync2(new(UserSetting)); err != nil {
+		return fmt.Errorf("sync2: %v", err)
+	}
+	return nil
+
+}