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narratio/docs/runbooks/s3-archive-foundations.md

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# S3 Archive Foundations Runbook
This runbook documents the currently implemented storage/archive foundations and the boundaries of current behavior.
## Implemented Now
- config modeling for:
- `pipeline.storage.s3`
- `pipeline.spool`
- `pipeline.archive`
- `session.inputs.audio_s3`
- promotion rule validation for safe relative paths
- run ID generation and path/key helper functions
- manifest run/path identity fields
- remote storage backend layer:
- object-store interface (`List`, `Download`, `Upload`, `Exists`)
- fake backend for deterministic tests
- S3-compatible backend using AWS SDK v2
- config-based backend construction helper
## Not Implemented Yet
- prepare-stage S3 object listing or download
- archive-stage S3 upload or promotion writes
- writing `current/manifest.json` or `current/run_id.txt` in S3
## Operational Notes
- local audio workflows remain the active development path (`audio_dir` or `audio_files`)
- `audio_s3` and local audio config are mutually exclusive
- do not place AWS credentials in Narratio config files
## Next Implementation Target
Use the storage backend layer in prepare-stage session audio discovery/download flow, while preserving local audio input support.