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[ENH][SEC]: Move HNSW Index metadata (pickle) to protobuf binary file
Description of changes
Summarize the changes made by this PR.
- Improvements & Bug fixes
- We persist the HNSW max_seq_id when the index is written; this will help with WAL cleanup and will not require loading the HNSW index before cleanup.
Test plan
How are these changes tested?
- [x] Tests pass locally with
pytest
for python
Documentation Changes
N/A