What is pgvectorscale and how does it extend pgvector?

pgvectorscale is an extension from Timescale that builds on top of pgvector to add the StreamingDiskANN index, a disk-optimized graph index based on Microsoft's DiskANN research. It enables pgvector to scale to hundreds of millions of vectors with low memory requirements by keeping the index on SSD, similar to dedicated vector databases. pgvectorscale also adds statistical binary quantization for further compression. It is designed for Postgres users who hit pgvector's scaling limits but want to stay in the Postgres ecosystem rather than adopt a separate vector database. ---