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activity_notification uses internal models for notifications and subscriptions
  - ActivityNotification::Notification
  - ActivityNotification::Subscription

  You can use your own models with same database table used by these internal models.

  Ensure you have configured table name in your initializer activity_notification.rb.
  For example:
    config.notification_table_name = "notifications"
    config.subscription_table_name = "subscriptions"

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