mempalace-dict-pickle-repairlisted

## When to use - `mempalace_search` throws `'dict' object has no attribute 'dimensionality'` - Healthcheck shows `ok` but search fails (probe gap — healthcheck doesn't do a live query) - Dict-format pickles keep reappearing after repair (segment UUID changes each time → repair pipeline is the source) ## Root cause pattern The repair pipeline (`mempalace-repair-now.sh`) writes a new HNSW pickle during each run. If the pipeline uses a code path that serializes the HNSW index as a plain `dict` instead of a `PersistentData` object, every repair run regenerates the broken pickle at a new segment UUID. The healthcheck only checks `CHROMA_API_IMPL` path existence — it does not open the pickle or run a live query — so it passes green while search is broken. ## Step 1 — Manual migration (immediate fix) # Find the broken segment grep -r "dimensionality" ~/.local/share/mempalace/ # or wherever the palace data dir is # Identify the pickle file find <palace-data-dir>/chroma/chroma-collections -name "*.pkl" | \ xargs python3 -c " import pickle, sys for f in sys.argv[1:]: with open(f, 'rb') as fh: d = pickle.load(fh) print(f, type(d).__name__) " 2>&1 | grep dict Once the file is identified: import pickle, shutil from chromadb.segment.impl.vector.local_persistent_hnsw import PersistentData pkl_path = "/path/to/broken/segment.pkl" shutil.copy(pkl_path, pkl_path + ".bak") with open(pkl_path, "rb") as f: d = pickle.load(f) if isinstance(d, dict): fixed = Pe