WO-2 — Kick off the full USPTO TRTYRAP corpus backfill in a DETACHED subprocess.

The full backfile is ~14M rows across ~177 chunks. Expected wall-clock: 3–8 hours (network + disk-bound). We use the same start_new_session=True detached-subprocess pattern as /v1/cron/run-pipeline so the HTTP request returns immediately.

Query params (both optional): max_chunks — cap chunks (smoke: 1 = ~1min, 5 = ~10min). max_records — cap records per chunk (smoke slice verification only).

Example (smoke): curl -X POST "https://api.etymolt.com/v1/cron/backfill-uspto-full?max_chunks=1&max_records=100" -H "Authorization: Bearer $ETL_CRON_TOKEN"

Example (real): curl -X POST "https://api.etymolt.com/v1/cron/backfill-uspto-full" -H "Authorization: Bearer $ETL_CRON_TOKEN"

Response: {"started_at": "...", "pid": 12345, "log_path": "/tmp/backfill_uspto_bulk_full.log", "note": "Detached. Poll /v1/cron/tm-index-coverage for progress."}