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Validate merge_person_id UUID
In case of error - return 422
Find preperson by id in mpi.prepersons
In case of error - return 404 (Preperson not found)
Check preperson status is active in mpi.prepersons
In case of error - return 409 (Preperson is not active)
Check if exists another preperson merge requests with status NEW or APPROVED for this preperson
if exists - update status of another requests to REJECTEDCANCELLED
Check if preperson has at least one episode
if no episodes - return 409 (Preperson has no episodes)
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