remove unused code

internal/db/bundb/errors.go

@@ -1,50 +0,0 @@
-// GoToSocial
-// Copyright (C) GoToSocial Authors admin@gotosocial.org
-// SPDX-License-Identifier: AGPL-3.0-or-later
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package bundb
-
-import (
-	"errors"
-	"fmt"
-
-	"github.com/jackc/pgx/v5/pgconn"
-	"github.com/superseriousbusiness/gotosocial/internal/db"
-)
-
-// errBusy is a sentinel error indicating
-// busy database (e.g. retry needed).
-var errBusy = errors.New("busy")
-
-// processPostgresError processes an error, replacing any postgres specific errors with our own error type
-func processPostgresError(err error) error {
-	// Attempt to cast as postgres
-	pgErr, ok := err.(*pgconn.PgError)
-	if !ok {
-		return err
-	}
-
-	// Handle supplied error code:
-	// (https://www.postgresql.org/docs/10/errcodes-appendix.html)
-	switch pgErr.Code { //nolint
-	case "23505" /* unique_violation */ :
-		return db.ErrAlreadyExists
-	}
-
-	// Wrap the returned error with the code and
-	// extended code for easier debugging later.
-	return fmt.Errorf("%w (code=%s)", err, pgErr.Code)
-}