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This should prevent constrain errors, one of side effects observed is that some messages might not get deleted in the first run. #917
Usage of two additional nested subqueries is extremely heavy here though... not sure if doing one select query and then using PHP to select ids to remove wouldn't be a lighter solution here.
PS. telegram_update query was broken because of this missing
AND updated_at < \'%1$s\'
statement forchat
table - it didn't clean the table until I added that - @noplanman ?