Use lock for VulnerabilityPolicyFetchTask
#504
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Description
Adds locking to
VulnerabilityPolicyFetchTasksuch that no two API server instances can execute it in parallel.The lock is held for at least one minute, and at most 5min in case the executing API server instance crashes before it can release the lock.
Addressed Issue
N/A
Additional Details
N/A
Checklist
This PR implements an enhancement, and I have provided tests to verify that it works as intendedThis PR introduces changes to the database model, and I have added corresponding update logicThis PR introduces new or alters existing behavior, and I have updated the documentation accordingly