curl --request DELETE \
  --url https://{base_url}/files/cleanup \
  --header 'X-API-Key: <api-key>'

{
  "files_deleted": 123,
  "bytes_freed": 123,
  "files_skipped": 123,
  "skipped_reasons": {
    "in_use_by_jobs": 123,
    "retention_policy": 123
  }
}