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narratio/docs/archive-storage.md

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# Archive Storage
This document describes implemented archive-stage publish behavior.
## S3 Paths
Session root:
`{root_prefix}/campaigns/{campaign}/sessions/{session_id}/`
Run prefix:
`{root_prefix}/campaigns/{campaign}/sessions/{session_id}/runs/{run_id}/`
## Scope
Implemented:
- archive uploads successful run records to remote object storage through the storage backend abstraction.
- archive uploads configured promoted outputs to session-level keys.
- archive uploads `current/manifest.json`.
- archive uploads `current/run_id.txt` last as the effective commit marker.
- tests use fake storage and do not require live S3.
Future work:
- spool audio cleanup/deletion behavior
- `notify` stage behavior
- stale detection
- optional future source-audio upload mode
- additional artifact generation beyond current implemented set
## Prerequisites
Archive verifies these stages succeeded before upload:
- `prepare`
- `transcribe`
- `merge`
- `polish`
- `normalize`
- `trim`
- `analyze`
If any prerequisite is missing or not succeeded, archive fails and does not upload.
Failed or incomplete runs remain local only.
## Run Upload
Archive uploads existing files from the run workdir when present:
- `inputs/`
- `transcripts/`
- `artifacts/`
- `reports/` (optional)
- `config/`
- `logs/`
- `manifest.json`
Relative paths are preserved under `runs/{run_id}/`.
## Promotion Rules
Archive applies `archive.promote_artifacts` in config order.
Rule behavior:
- `from`: local workdir-relative source path
- `to`: session-root-relative destination key
- `required: true`: missing source fails archive
- `required: false`: missing source is skipped and recorded
Default promoted outputs:
- `transcripts/trimmed.json`
- `artifacts/session_recap.md`
## Current Pointers
Archive writes:
1. `current/manifest.json` (after run upload + promotions)
2. `current/run_id.txt` last
`current/run_id.txt` contains exactly:
- `{run_id}` plus trailing newline
Writing `current/run_id.txt` last makes it the effective commit marker for published session state.
If any required run upload, promotion upload, or current-manifest upload fails, archive returns failure and does not write `current/run_id.txt`.
## Audio Upload Policy
Archive does not upload local `audio/` by default.
Original audio is expected at the session-level audio prefix and is not duplicated under `runs/{run_id}/`.
## Config Controls
- `archive.enabled: false` skips archive cleanly.
- `archive.upload_run: false` skips run upload cleanly.
## Metadata
Archive stage metadata includes non-secret upload context (for example):
- `s3_bucket`
- `s3_run_prefix`
- run upload counts/paths
- promoted upload counts/paths
- skipped optional promotions
- `current_manifest_key`
- `current_run_id_key`
- `current_pointer_written`
- `audio_upload_skipped`