executing an `update` statement does not use `.onUpdateNow()` defined in schema

export const users = mysqlTable("USERS", {
  id: varchar("ID", { length: 21 }).notNull().primaryKey(),
  hostname: varchar("HOSTNAME", { length: 253 }).notNull(),
  email: varchar("EMAIL", { length: 320 }).notNull(),
  verified: boolean("VERIFIED").notNull().default(false),
  createdAt: timestamp("CREATED_AT").notNull().defaultNow(),
  updatedAt: timestamp("UPDATED_AT").onUpdateNow(),
});

  await db
    .update(users)
    .set({
      ...(putUser.email ? { email: putUser.email } : {}),
      ...(putUser.url ? { hostname: new URL(putUser.url).hostname } : {}),
    })
    .where(eq(users.id, user.id));