Dan Newton c4027e23bf
ENT-5649 Always load from db when flow retries (#6637)
Always attempt to load a checkpoint from the database when a flow
retries.

This is to prevent transient errors where the checkpoint is committed to
the database but throws an error back to the node. When the node tries
to retry in this scenario, `isAnyCheckpointPersisted` is false, meaning
that it will try to insert when it tries to save its initial checkpoint
again.

By loading from the existing checkpoint, even though it doesn't
really use it because it is `Unstarted`, the flag gets put into the
right state and will update rather than insert later on.
2020-08-14 17:42:19 +01:00
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