Mysterious entries in topic_users table

fefrei (Felix Freiberger) May 11, 2016, 9:10pm 5

No, the account never existed – I only have about 150 users, so the id has never been used.

Topic		Replies	Views
App/models/topic_tracking_state - `report` - long response times? Development slow-sql	6	1946	February 26, 2016
NULL first_visited_at dates in the topic_users table Development	5	2884	July 2, 2016
Failed to process hijacked response correctly : Couldn't find Topic with 'id'=569 Bug	14	1820	November 26, 2018
Performance improvements on long topics? Product Support	29	5849	July 12, 2018
Is `topic_users.last_visited_at` supposed to be updated on every visit? Development	5	2385	July 25, 2016