Dashboards: Add feature restore dashboards backend (#83131)

Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>

pkg/services/sqlstore/migrations/dashboard_mig.go

@@ -234,4 +234,13 @@ func addDashboardMigration(mg *Migrator) {
 	mg.AddMigration("Add isPublic for dashboard", NewAddColumnMigration(dashboardV2, &Column{
 		Name: "is_public", Type: DB_Bool, Nullable: false, Default: "0",
 	}))
+
+	mg.AddMigration("Add deleted for dashboard", NewAddColumnMigration(dashboardV2, &Column{
+		Name: "deleted", Type: DB_DateTime, Nullable: true,
+	}))
+
+	mg.AddMigration("Add index for deleted", NewAddIndexMigration(dashboardV2, &Index{
+		Cols: []string{"deleted"},
+		Type: IndexType,
+	}))
 }

pkg/services/sqlstore/searchstore/builder.go

@@ -66,6 +66,7 @@ func (b *Builder) buildSelect() {
 			dashboard_tag.term,
 			dashboard.is_folder,
 			dashboard.folder_id,
+			dashboard.deleted,
 			folder.uid AS folder_uid,
 		`)
 	if b.Features.IsEnabledGlobally(featuremgmt.FlagNestedFolders) {

pkg/services/sqlstore/searchstore/filters.go

@@ -198,3 +198,15 @@ var _ model.FilterWhere = &FolderWithAlertsFilter{}
 func (f FolderWithAlertsFilter) Where() (string, []any) {
 	return "EXISTS (SELECT 1 FROM alert_rule WHERE alert_rule.namespace_uid = dashboard.uid)", nil
 }
+
+type DeletedFilter struct {
+	Deleted bool
+}
+
+func (f DeletedFilter) Where() (string, []any) {
+	if f.Deleted {
+		return "dashboard.deleted IS NOT NULL", nil
+	}
+
+	return "dashboard.deleted IS NULL", nil
+}