Add guardrails for UniqueViolation caused by parallel requests #592
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Sometime, when multiple requests are submitted with the same parameters, it can cause a UniqueViolation in the database. Example, when requests A and B started, a value wasn't present so they both decide to add a value X. A's addition is successful while when B tries to add it, a UniqueViolation is triggered since A already added it.
Refers to CLOUDDST-20863