Hello, @eprodromou! You can follow progress regarding our conversations with the DBAs (and, consequently, whether or not any changes will need to be made to the watchlist expiry feature or the ability to store more data in the watchlist table) in T261005. Currently, we have received the go-ahead from the DBAs for our plan, so no additional work is necessary to determine changes to the watchlist table at the moment. The plan is to incrementally release to a group of pilot wikis. The DBAs will then monitor if the introduction of the feature impacts the table and if any further adjustments must be made. So, in short, we can hold off on looking into accommodating more data in the watchlist table until we hear word from the DBAs on next steps in T261005. Thanks!

See also T258098: Purge unused watchlist rows which should fee up a sizable amount of space in the watchlist table (depending on the wiki), and has some ideas about future-proofing. I believe this is a worthwhile pursuit regardless of what happens with watchlist expiry.

@ifried I'm going to close this ticket, then. Seems like we're in good shape. LMK if we can help out otherwise.

Works for me. Thanks for the update, @eprodromou.