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SP4 Phase B.3 — preview-counts. Validates the operation tree, compiles to a SELECT-subject_id SQL fragment using the source's cohort schema, and dispatches to Darkstar's sync /finngen/cohort/preview-count route to get COUNT(DISTINCT subject_id).

POST 
/api/v1/finngen/workbench/preview-counts

Errors:

  • 422 — tree fails validation (missing children, bad cohort_id, ...)
  • 404 — source_key not found
  • 504 — Darkstar timeout
  • 502 — Darkstar unreachable (network) or rejected (4xx)

Request​

Responses​