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Separate ChromaDB model cache into its own named volume

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The ONNX embedding model (~79 MB) downloads to ~/.cache/chroma/ on
first mempalace search. Without persistence it re-downloads on every
container recreation. Add a separate devbox-chroma-cache volume
rather than mixing it into the palace data volume — model cache is
disposable (delete and re-download), palace data is precious (back
up and migrate). Both volumes are commented out by default (opt-in).

Updated README.md storage section to explain the two-volume split
and the air-gapped pre-population path. Added chroma cache row to
DOCKER_HUB.md data storage table.
This commit is contained in:
Joakim Persson
2026-04-27 20:05:45 +02:00
parent adaf7ba2ff
commit 7a8de0463f
4 changed files with 26 additions and 3 deletions
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README.md
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@@ -495,9 +495,20 @@ Each workspace gets its own isolated "wing" — memories never leak between proj
### Storage
- **Palace data** (ChromaDB vectors, SQLite knowledge graph, drawers): `~/.mempalace/` — persists via the `devbox-palace` named volume
- **Embedding model** (~300 MB): downloaded on first use, cached inside the palace directory
- **No API keys required** for core functionality (local embeddings via ONNX)
Two separate named volumes keep different data classes apart:
- **Palace data** (`~/.mempalace/`): ChromaDB vectors, SQLite knowledge graph, drawers. This is your memory — back it up, treat it as precious. Persists via the `devbox-palace` named volume.
- **Embedding model cache** (`~/.cache/chroma/`): ONNX model (~79 MB), downloaded automatically on first search. Disposable — blow it away and it re-downloads in ~4 seconds. Persists via the `devbox-chroma-cache` named volume so you don't re-download on every container recreation.
- **No API keys required** for core functionality (local embeddings via ONNX).
Both volumes are commented out by default in `docker-compose.yml` — uncomment to enable:
```yaml
- devbox-palace:/home/developer/.mempalace
- devbox-chroma-cache:/home/developer/.cache/chroma
```
**Air-gapped environments:** pre-populate the `devbox-chroma-cache` volume with the `all-MiniLM-L6-v2/` model contents. The palace volume needs no pre-population.
## Shell defaults