UPDATE sop_nodes n
JOIN sop_versions sv ON sv.id = n.sop_version_id
SET n.config = JSON_SET(
  n.config,
  '$.knowledge_card_version_id',
  (
    SELECT kv.id
    FROM knowledge_card_versions kv
    WHERE kv.tenant_id = n.tenant_id
      AND kv.knowledge_card_id = CAST(JSON_UNQUOTE(JSON_EXTRACT(n.config, '$.knowledge_card_id')) AS UNSIGNED)
      AND kv.created_at <= COALESCE(sv.published_at, sv.updated_at)
    ORDER BY kv.version DESC
    LIMIT 1
  )
)
WHERE n.type = 'knowledge'
  AND JSON_EXTRACT(n.config, '$.knowledge_card_version_id') IS NULL
  AND JSON_EXTRACT(n.config, '$.knowledge_card_id') IS NOT NULL
  AND EXISTS (
    SELECT 1
    FROM knowledge_card_versions kv
    WHERE kv.tenant_id = n.tenant_id
      AND kv.knowledge_card_id = CAST(JSON_UNQUOTE(JSON_EXTRACT(n.config, '$.knowledge_card_id')) AS UNSIGNED)
      AND kv.created_at <= COALESCE(sv.published_at, sv.updated_at)
  );