The socket retrieved from ensureManagerSocketReady() was never passed to
enqueueDalpuriFullSync(), so inside createWorkerJob the socket.emit('requestId')
call crashed with 'TypeError: undefined is not an object (evaluating A.emit)'.
This caused every full sync job to fail immediately, leaving the DB empty.
The 5s incremental sync interval then flooded the queue with 4700+ jobs that
all failed too since there was no data.
Also manually cleared the backlog of 4720 failed/pending incremental jobs and
2 failed full sync jobs from the production queue.
HoloPanio