Well, how embarrasing!!!
Whomever exported that merc sql appears to have used a wildcard of "merc" so the merchantlist and merchanlist_temp tables were exported to it. When you import this mercs.sql it deletes your existing merchantlist and inserts an older non-compat version.
You have two options:
1-
A>On your working database, export the merchantlist tables into an sql file.
B>Import mercs.sql, then import your merchanlist.sql from your previously working db
2-
A> Edit the mercs.sql and remove all lines pertaining to merchantlist
B> Import the now smaller mercs.sql
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