Added new columns to dashboard table

pkg/services/sqlstore/migrations/dashboard_mig.go

@@ -92,4 +92,14 @@ func addDashboardMigration(mg *Migrator) {
 		Sqlite("SELECT 0 WHERE 0;").
 		Postgres("SELECT 0;").
 		Mysql("ALTER TABLE dashboard MODIFY data MEDIUMTEXT;"))
+
+  // add column to store creator of a dashboard
+  mg.AddMigration("Add column created_by", NewAddColumnMigration(dashboardV2, &Column{
+    Name: "created_by", Type: DB_BigInt, Nullable: true,
+  }))
+
+  // add column to store updater of a dashboard
+  mg.AddMigration("Add column updated_by", NewAddColumnMigration(dashboardV2, &Column{
+    Name: "updated_by", Type: DB_BigInt, Nullable: true,
+  }))
 }