Jon Robson, 14/12/2013 03:41:
It seems there are duplicate rows in the database table where every column has the same value except id.
What table? If this somehow comes from recentchanges, remember that wikidata inserts fake rows. Any and all queries against RC must filter rc_type != 5. https://bugzilla.wikimedia.org/show_bug.cgi?id=43581
Nemo