This reverts commit f4284b4e.

This reverts commit efbe327f, reversing
changes made to 6d9bcd07.

We have contexts.hash_id which is enough (computed by postgres as a
trigger).

Basically, Gargantext.Prelude exports all of Protolude now.

Based on the suggestions in
https://kodimensional.dev/space-leak

Doesn't compile yet.

This is somewhere in Flow.hs in types for ConduitT () a m ()
where m monad is IO.

Now the job doesn't return 'succeeded' fields when it actually fails.