Called by:

• Mobilizon.GraphQL.Resolvers.Event.extract_timezone (L553)
• Mobilizon.GraphQL.Resolvers.User.user_settings (L680)
• Mobilizon.GraphQL.Resolvers.User.user_settings (L689)
• Mobilizon.GraphQL.Resolvers.User.set_user_setting (L704)
• Mobilizon.Service.Notifications.Scheduler.before_event_notification (L37)
• Mobilizon.Service.Notifications.Scheduler.on_day_notification (L56)
• Mobilizon.Service.Notifier.Email.save_last_notification_time (L198)