Due to an oversight on my part the tool is currently saving recentchanges IDs to the database instead of revision IDs. These are much less useful because the recentchanges table only stores ~30 days of data.

We can re-import revision IDs pre-August 2018 from the old database, but we'll have a gap between then and 30 days from when this task is completed unless we go back to do a one-off task to fill in the gaps. This might be worthwhile anyway to retrieve missing data between August and September 2018 when the tool was down.