If you need to talk to me about the bot please reach out via https://matrix.to/#/#server_stats:nordgedanken.dev or in a dm via https://matrix.to/#/@mtrnord:nordgedanken.dev
The list page is currently down due to resolving https://sunbeam.city/@kawaiipunk/106726017782788109 and especially people urging for gdpr complaints (https://masthead.social/@KitKat/106727127882922905).
As I am in no position to handle such complaints I am going to take the safe side until it seems to settle down.
No. It doesnt spam messages, it doesnt't record any of your messages permanently, it doesn't record who mentioned a room and it doesn't record when a room was mentioned.
To this question 2 things are needed to be known:
For the first half the bot records the room id, a hash of that room id and the childs of a room and the
parents of that room based on the room id hash.
For the second half the same thing as with regular Matrix Users applies to the data. The bot can see members, topic, avatar, room name. It can't see messages of the past as those after scanning for aliases get cleared from synapse due to the space required. Any of this data is data stored in synapse as the bot is a regular Matrix user in the same way as you and others are.
However only a subset of that data will ever be publicly made available. This includes: