During the first phase of the migration to the subscription_measurements table we had to migrate the has_unlimited_usage column from the subscription_measurements table to the subscriptions table.  As part of this migration, we added a trigger to the subscription_measurements table so that subsequent changes to its has_unlimited_usage column would be reflected in the subscription table.

We then added a foreign key relationship between the offering and subscriptions table (SWATCH-1365).  Part of that effort moved the has_unlimited_usage column from the subscriptions table to the offering table.  In that card we dropped the has_unlimited_usage column off subscription entirely since that column is also on the offering table.  However, I forgot to remove the triggers on subscription_capacity.  Those triggers were then left trying to insert data into a column that no longer existed.