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Add new table rating_change_log in which updated user ratings are logged (both after finished games and due to score decay). Small change to the score decay: Filter out users who are already at the maximum sigma. Their score wouldn't change anymore and by skipping them, we do not pollute the logs with basically meaningless entries.
It is useful to re-run the script on an existing database if the only change was adding tables. So instead of directly exiting in this case, ask for confirmation.
It is much shorter and says basically the same.
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Log all user rating changes (after games and due to score decay) in a new database table.
This log may be useful later for analyzing how the leaderboard evolves.
Closes #189.