Erik Johnston 59fa91fe88 Retry event persistence on IntegrityError
Due to a bug in the porting script some backfilled events were not
correctly persisted, causing irrecoverable IntegrityErrors on future
attempts to persist those events.

This commit adds a retry mechanism invoked upon IntegrityError,
where when retried the tables are purged for all references to the
events being persisted.
2016-08-04 15:02:15 +01:00
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