Page Comparison

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1. Validate preperson_mpi_id UUID

   1. In case of error - return 422

2. Check preperson_mpi_id doesn't exist in mpi.persons, but exists in medical_data.patients as patient_id. It means that preperson_mpi_id relates to preperson, but not to person.

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

3. Check preperson status is active in medical_data.patients

   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 to REJECTED

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