Added columns in dashboard_snapshot

pkg/services/sqlstore/migrations/dashboard_snapshot_mig.go

@@ -54,4 +54,15 @@ func addDashboardSnapshotMigrations(mg *Migrator) {
 		Sqlite("SELECT 0 WHERE 0;").
 		Postgres("SELECT 0;").
 		Mysql("ALTER TABLE dashboard_snapshot MODIFY dashboard MEDIUMTEXT;"))
+
+	// add column to store creator of a dashboard snapshot
+	mg.AddMigration("Add column created_by in dashboard_snapshot", NewAddColumnMigration(snapshotV5, &Column{
+		Name: "created_by", Type: DB_BigInt, Nullable: true,
+	}))
+
+	// add column to store updater of a dashboard snapshot
+	mg.AddMigration("Add column updated_by in dashboard_snapshot", NewAddColumnMigration(snapshotV5, &Column{
+		Name: "updated_by", Type: DB_BigInt, Nullable: true,
+	}))
+
 }