Checking errors from transactions in go

backend/internal/database/db.go

@@ -204,15 +204,22 @@ func (d *Db) AddProject(name string, description string, username string) error
 	tx := d.MustBegin()
 	_, err := tx.Exec(projectInsert, name, description, username)
 	if err != nil {
-		tx.Rollback()
+		if err := tx.Rollback(); err != nil {
+			return err
+		}
 		return err
 	}
 	_, err = tx.Exec(changeUserRole, "project_manager", username, name)
 	if err != nil {
-		tx.Rollback()
+		if err := tx.Rollback(); err != nil {
+			return err
+		}
 		return err
 	}
-	tx.Commit()
+	if err := tx.Commit(); err != nil {
+		return err
+	}
+
 	return err
 }