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Concept_id for custom values

I have 2 questions.

  1. In Notes entity, what shall we use for encoding_concept_id field. I assume it should be UTF-8 or UTF-16 but none of those are present in Athena Vocab.
  2. If there is no value for above and if I need to create a new concept_id with id > 2 Billion. What values should be added to Domain_Id, Vocabuary_Id,concept_class_id, standard_concept ,concept_code ,valid_start_date ,valid_end_date ,invalid_reason in concept table.

TIA
-Ambuj

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