Page Comparison

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1. Validate merge_person_id UUID

   1. In case of error - return 422

2. Find preperson by id in mpi.prepersons

   1. In case of error - return 422 (Such preperson doesn't exist)

3. Check preperson status is active in mpi.prepersons

   1. In case of error - return 409 (Preperson is not active)

4. Check if exists another preperson merge requests with status NEW or APPROVED for this preperson

   1. if exists - update status of another requests to REJECTED

5. Check if preperson has at least one episode

   1. if no episodes - return 422 (Preperson has no episodes)

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