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There are more gradations in "locking" than just pure pessimistic ("don't allow any other accesses of this document while it's being looked at!") and pure optimistic ("assume that no accesses of or updates to this document will ever conflict with one another!"). There's more granular, still-pessimistic locking. E.g., allow clients to only take out one ...


I would try to solve this with (at least) four document states unprocessed export started (but not under processing) under processing (means: after export finished) processed Moreover, it will be probably a good idea to add a timestamp field to remember when the last state was changed, and as @Bart pointed out, an additional field which user caused the ...

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