Multi-Vector Retrieval

This week’s landscape is shaped by a recurring tension between architectural simplicity and retrieval sophistication. Multiple independent projects are converging on SQLite as an all-in-one persistence substrate for AI memory, while new work on multi-vector search and memory management questions whether raw vector storage alone is sufficient at scale. A practitioner report on hybrid BM25-plus-vector retrieval also introduces a useful counterexample to one of the field’s more common assumptions.