lock website for background jobs (#1820)

* lock website for background jobs

* remove byebug

* fix

* fix

* if...else instead of begin...rescue

Co-authored-by: Arnaud Levy <arnaud.levy@noesya.coop>

* fix

* fix

* fix

* fix

* fix

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Co-authored-by: Arnaud Levy <arnaud.levy@noesya.coop>