$defaultFn() for an ISO timestamp in a text() field set as NULL

export const users = sqliteTable("user", {
  id: text("id")
    .primaryKey()
    .$defaultFn(() => crypto.randomUUID()),
  name: text("name"),
  email: text("email").unique(),
  createdAt: text('created_at').$defaultFn(() => new Date().toISOString()),
  updatedAt: text('updated_at').$defaultFn(() => new Date().toISOString())
})

export const users = sqliteTable("user", {
  id: text("id")
    .primaryKey()
    .$defaultFn(() => crypto.randomUUID()),
  name: text("name"),
  email: text("email").unique(),
  createdAt: text('created_at').$defaultFn(() => new Date().toISOString()),
  updatedAt: text('updated_at').$defaultFn(() => new Date().toISOString())
})