This code written in Python get all more than a year inactive users from Mastodon's database and email them with the subject and message of your choice.
1. Run 'db-setup.py' to set database parameters and create needed database and table. All collected data of inactive users (see point 3) will be written there.
3. Run 'mailing.py' to start emailing your inactive users ('last_sign_in_at' older than a year). Their username, account_id, email, delivery status (True if successful) and delivery date will be written to Postgresql database. There is another column, 'deleted', False by default. Will be useful to track deleted/not deleted inactive users if you choose to do so.
4. Use your favourite scheduling method to set mailing.py to run regularly. Column 'elapsed_days' of mailing's database will be updated so you can decide actions after some time.