Log hash key conflicts

The normalized hash will inherently have conflicts.

The initial hash is a PK in the title table.
so the first entry there wins
so initial population of the table wins.
Conflicts for the main hash are done using a
pre insert select on the master.

Bug: T156240
Change-Id: Ibf284146de4637ea901e0bc4c402d4f18b7d7f48