* Revert "Revert "Unistore : Ensure Watch works in HA mode." (#94097)"
This reverts commit 7c3fc2f261.
* make previous_resource_version nullable
* handle nil case
* Revert "Revert "Unistore : Ensure Watch works in HA mode." (#94097)"
This reverts commit 7c3fc2f261.
* make previous_resource_version nullable
* handle nil case