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We store subscriptions which you add to the bot.

These subscriptions contain your chatId, a numeric
identifier assigned to your conversation with this bot by Telegram, and the stations which you subscribed to.

Subscriptions are stored in order to provide the main service of this bot to you, which is our legitimate interest
in processing this kind of information about you.

In the database itself subscriptions are only stored as long as the subscription is valid. It might also be
contained in backu