This array structure was too deep and caused invalid records to
get added to the DB on MySQL (since it doesn't have CHECK
constraints) and errors on Postgres.

Bug introduced in e283a68a

 while
implementing the features described in bug #807278.

Change-Id: I65aa9b6de736294320e6d2bce2ea549a67ba2577
Signed-off-by: Francois Marier <francois@catalyst.net.nz>