Add repository method for deleting entity

link/repository.go

@@ -74,6 +74,30 @@ func (r *PgRepository) FindById(id string) (*Link, error) {
 	return entity, nil
 }
 
+func (r *PgRepository) DeleteById(id string) error {
+	ctx := context.Background()
+	tx, err := r.pool.Begin(ctx)
+	if err != nil {
+		return err
+	}
+
+	sql := `
+		DELETE FROM links WHERE id = $1
+	`
+
+	_, err = tx.Exec(ctx, sql, id)
+	if err != nil {
+		_ = tx.Rollback(ctx)
+		return err
+	}
+
+	if err = tx.Commit(ctx); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func mapRowToEntity(r pgx.Row) (*Link, error) {
 	var entity Link
 	var urlStr string