feat: update

backend/app/models/users.go

@@ -343,3 +343,21 @@ func (m *usersModel) Count(ctx context.Context, cond BoolExpression) (int64, err
 
 	return cnt.Cnt, nil
 }
+
+// UpdateUsername
+func (m *usersModel) UpdateUsername(ctx context.Context, id int64, username string) error {
+	tbl := table.Users
+	stmt := tbl.
+		UPDATE(tbl.Username).
+		SET(String(username)).
+		WHERE(
+			tbl.ID.EQ(Int64(id)),
+		)
+	m.log.Infof("sql: %s", stmt.DebugSql())
+
+	if _, err := stmt.ExecContext(ctx, db); err != nil {
+		m.log.Errorf("error updating username: %v", err)
+		return err
+	}
+	return nil
+}