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Код

IF (OLD."Pk_Id" IS NOT NULL)
    THEN
        WITH rec AS(
            SELECT "@Document" AS "Id",
                    (COALESCE(("Key"->>OLD."Key"::text)::bigint, 0) - 1)::bigint AS "Value",
                    "Key"  - OLD."Key"::text AS "NewKey"
            FROM "Document"
            WHERE "Pk_Id" = OLD."Pk_Id"
            LIMIT 1
        ),
          upd AS(
           UPDATE "DocumentRaw"
           SET "Key" =  (CASE
             WHEN (SELECT "Value" FROM rec) > 0 AND rec."NewKey" != '{}'::jsonb
             THEN "Key" || jsonb_build_object(OLD."Key"::text, (SELECT "Value" FROM rec))
             WHEN (SELECT "Value" FROM rec) <= 0 AND rec."NewKey" != '{}'::jsonb
             THEN "Key"  - OLD."Key"::text
             END
             )
           FROM rec
           WHERE
               rec."NewKey" != '{}'::jsonb AND
              "@DocumentRaw" = rec."Id"
       )
         DELETE FROM "DocumentRaw"
       USING rec
       WHERE rec."NewKey" = '{}'::jsonb AND
       "@DocumentRaw" = rec."Id";
END IF;