Upload 404 warning doc_set(merge=True) in upload.py — creates doc if missing
MQTT call_end 404 error doc_set(merge=True) in mqtt_handler.py — same root cause
Transcription 404 (saving transcript to nonexistent doc) doc_set(merge=True) in transcription.py
Transcription ADC credentials error Explicit service_account.Credentials from gcp-key.json in _sync_transcribe — same pattern as storage.py
app/internal/storage.py Replaced make_public() + public_url with a v2 signed URL (1-year expiry, no public bucket needed)
app/main.py Releases all in-use tokens at startup — tokens from previous sessions are cleared automatically
app/routers/tokens.py Added POST /tokens/flush to force-release orphaned tokens on demand
Logan