2014-11-01 11:05:02 INFO pgsql-relation-joined OperationalError: FATAL:  the database system is shutting down
2014-11-01 11:05:02 INFO pgsql-relation-joined FATAL:  the database system is shutting down
2014-11-01 11:05:02 INFO pgsql-relation-joined Syncing...
2014-11-01 11:05:02 INFO juju-log pgsql:28: migration command failed, retrying...
2014-11-01 11:05:08 INFO pgsql-relation-joined OperationalError: could not connect to server: Connection refused
2014-11-01 11:05:08 INFO pgsql-relation-joined 	Is the server running on host "10.0.3.85" and accepting
2014-11-01 11:05:08 INFO pgsql-relation-joined 	TCP/IP connections on port 5432?
2014-11-01 11:05:08 INFO pgsql-relation-joined Syncing...
2014-11-01 11:05:08 INFO juju-log pgsql:28: migration command failed, retrying...
2014-11-01 11:05:13 INFO pgsql-relation-joined OperationalError: could not connect to server: Connection refused
2014-11-01 11:05:13 INFO pgsql-relation-joined 	Is the server running on host "10.0.3.85" and accepting
2014-11-01 11:05:13 INFO pgsql-relation-joined 	TCP/IP connections on port 5432?
2014-11-01 11:05:13 INFO pgsql-relation-joined Syncing...
2014-11-01 11:05:13 INFO juju-log pgsql:28: migration command failed, retrying...
2014-11-01 11:05:19 INFO pgsql-relation-joined OperationalError: could not connect to server: Connection refused
2014-11-01 11:05:19 INFO pgsql-relation-joined 	Is the server running on host "10.0.3.85" and accepting
2014-11-01 11:05:19 INFO pgsql-relation-joined 	TCP/IP connections on port 5432?
2014-11-01 11:05:19 INFO pgsql-relation-joined Syncing...
2014-11-01 11:05:19 INFO juju-log pgsql:28: migration command failed, retrying...
2014-11-01 11:05:25 INFO pgsql-relation-joined OperationalError: could not connect to server: Connection refused
2014-11-01 11:05:25 INFO pgsql-relation-joined 	Is the server running on host "10.0.3.85" and accepting
2014-11-01 11:05:25 INFO pgsql-relation-joined 	TCP/IP connections on port 5432?
2014-11-01 11:05:25 INFO pgsql-relation-joined Syncing...
2014-11-01 11:05:25 INFO juju-log pgsql:28: migration command failed, retrying...
2014-11-01 11:05:34 INFO juju-log pgsql:28: migration command failed
2014-11-01 11:05:34 INFO pgsql-relation-joined Traceback (most recent call last):
2014-11-01 11:05:34 INFO pgsql-relation-joined   File "/var/lib/juju/agents/unit-ci-airline-ts-django-0/charm/hooks/pgsql-relation-joined", line 613, in <module>
2014-11-01 11:05:34 INFO pgsql-relation-joined     hooks.execute(sys.argv)
2014-11-01 11:05:34 INFO pgsql-relation-joined   File "/var/lib/juju/agents/unit-ci-airline-ts-django-0/charm/hooks/charmhelpers/core/hookenv.py", line 480, in execute
2014-11-01 11:05:34 INFO pgsql-relation-joined     self._hooks[hook_name]()
2014-11-01 11:05:34 INFO pgsql-relation-joined   File "/var/lib/juju/agents/unit-ci-airline-ts-django-0/charm/hooks/pgsql-relation-joined", line 550, in pgsql_relation_joined_changed
2014-11-01 11:05:34 INFO pgsql-relation-joined     _db_migrate()
2014-11-01 11:05:34 INFO pgsql-relation-joined   File "/var/lib/juju/agents/unit-ci-airline-ts-django-0/charm/hooks/pgsql-relation-joined", line 444, in _db_migrate
2014-11-01 11:05:34 INFO pgsql-relation-joined     raise Exception("Migration failed")
2014-11-01 11:05:34 INFO pgsql-relation-joined Exception: Migration failed
2014-11-01 11:05:34 ERROR juju.worker.uniter uniter.go:486 hook failed: exit status 1

Some races can't be defeated by re-trying...