discourse/db/migrate/20200306060737_add_reminder_set_at_to_bookmarks.rb

# frozen_string_literal: true

class AddReminderSetAtToBookmarks < ActiveRecord::Migration[6.0]
  def change
    add_column :bookmarks, :reminder_set_at, :datetime, null: true
    add_index :bookmarks, :reminder_set_at
  end
end
FEATURE: Send notifications for time-based and At Desktop bookmark reminders (#9071) * This PR implements the scheduling and notification system for bookmark reminders. Every 5 minutes a schedule runs to check any reminders that need to be sent before now, limited to 300 reminders at a time. Any leftover reminders will be sent in the next run. This is to avoid having to deal with fickle sidekiq and reminders in the far-flung future, which would necessitate having a background job anyway to clean up any missing `enqueue_at` reminders. * If a reminder is sent its `reminder_at` time is cleared and the `reminder_last_sent_at` time is filled in. Notifications are only user-level notifications for now. * All JavaScript and frontend code related to displaying the bookmark reminder notification is contained here. The reminder functionality is now re-enabled in the bookmark modal as well. * This PR also implements the "Remind me next time I am at my desktop" bookmark reminder functionality. When the user is on a mobile device they are able to select this option. When they choose this option we set a key in Redis saying they have a pending at desktop reminder. The next time they change devices we check if the new device is desktop, and if it is we send reminders using a DistributedMutex. There is also a job to ensure consistency of these reminders in Redis (in case Redis drops the ball) and the at desktop reminders expire after 20 days. * Also in this PR is a fix to delete all Bookmarks for a user via `UserDestroyer` 2020-03-12 10:16:00 +10:00			`# frozen_string_literal: true`

			`class AddReminderSetAtToBookmarks < ActiveRecord::Migration[6.0]`
			`def change`
			`add_column :bookmarks, :reminder_set_at, :datetime, null: true`
			`add_index :bookmarks, :reminder_set_at`
			`end`
			`end`