cubicweb-worker #1908694 be robust against db disconnection > 5 minutes [resolved]

(5 minutes being the default stale worker TTL)

cases: * "db link failure" * laptop hibernation

prioritynormal
typebug
done in0.1.1
load0.100
load left0.000
closed by#e802b57d7979 [hooks] recreate worker if it was killed by accident (e.g. laptop hibernation, db out for some time)