I have a question about mapping our systems codes to standard-concepts. If we use the Usagi tool to create the map (to a standard concept in the CONCEPT table), I understand that we append to the source_to_concept_map table (one record for each source-code). But in looking at the table documentation, I don’t understand: “If there is no source_concept_id available because the source codes are local and not supported by the Standard Vocabulary, the content of the field is 0 (zero, not null) encoding an undefined concept. However, local Source Concepts are established (concept_id values above 2,000,000,000).”
Do we create a CONCEPT table record for each of our codes or use “0” as the source_concept_id?