Currently:
- hashs (T54927 for prod)
- povwatch_log (T54924 for prod)
- povwatch_subscribers (T54924 for prod)
- pif_edits (part of https://www.mediawiki.org/wiki/Personal_image_filter ?? )
These were probably used at some point in teh long lone past, but labsdb should provide a consistent view of active MW tables, not long lost ones (we can make them available in other formats if necessary).