Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/boards/services/store/sqlstore/system.go

@@ -0,0 +1,69 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package sqlstore
+
+import (
+	sq "github.com/Masterminds/squirrel"
+
+	"github.com/mattermost/mattermost-server/v6/server/boards/model"
+)
+
+func (s *SQLStore) getSystemSetting(db sq.BaseRunner, key string) (string, error) {
+	scanner := s.getQueryBuilder(db).
+		Select("value").
+		From(s.tablePrefix + "system_settings").
+		Where(sq.Eq{"id": key}).
+		QueryRow()
+
+	var result string
+	err := scanner.Scan(&result)
+	if err != nil && !model.IsErrNotFound(err) {
+		return "", err
+	}
+
+	return result, nil
+}
+
+func (s *SQLStore) getSystemSettings(db sq.BaseRunner) (map[string]string, error) {
+	query := s.getQueryBuilder(db).Select("*").From(s.tablePrefix + "system_settings")
+
+	rows, err := query.Query()
+	if err != nil {
+		return nil, err
+	}
+	defer s.CloseRows(rows)
+
+	results := map[string]string{}
+
+	for rows.Next() {
+		var id string
+		var value string
+
+		err := rows.Scan(&id, &value)
+		if err != nil {
+			return nil, err
+		}
+
+		results[id] = value
+	}
+
+	return results, nil
+}
+
+func (s *SQLStore) setSystemSetting(db sq.BaseRunner, id, value string) error {
+	query := s.getQueryBuilder(db).Insert(s.tablePrefix+"system_settings").Columns("id", "value").Values(id, value)
+
+	if s.dbType == model.MysqlDBType {
+		query = query.Suffix("ON DUPLICATE KEY UPDATE value = ?", value)
+	} else {
+		query = query.Suffix("ON CONFLICT (id) DO UPDATE SET value = EXCLUDED.value")
+	}
+
+	_, err := query.Exec()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}