Proxy search

[ChuckHend]

Further work on implementing a proxy that enables the following on any postgres w/ pgvector installed:

SELECT *
FROM vectorize.search(job=>'my_job', query=>'camping backpack', num_results=>3)

vectorize.search is accessible only through the proxy and not through a direction connection to postgres. It is not a function in the database, rather it is only parsed and transformed in the proxy.

[Copilot]

Pull request overview

This PR continues the “proxy search” work by adding support for rewriting vectorize.search(...) SQL calls inside the PostgreSQL wire-protocol proxy into the underlying hybrid-search SQL (with embeddings generated by the proxy), plus adds a standalone vectorize-proxy binary and integration tests/docs to exercise the behavior.

Changes:

• Add parsing + rewriting for vectorize.search() in the proxy message pipeline, producing result sets as raw table rows (not JSON).
• Introduce a dedicated vectorize-proxy CLI binary and refactor the proxy accept loop into a reusable run_proxy_loop.
• Add proxy-focused README + integration tests to validate projection/ordering/limit semantics through the proxy.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
proxy/tests/proxy.rs	Adds end-to-end integration tests covering passthrough and vectorize.search() query shapes.
proxy/src/proxy.rs	Extracts the TCP accept loop into a reusable run_proxy_loop used by both library and binary.
proxy/src/message_parser.rs	Detects vectorize.search() in Simple Query + Parse messages and rewrites SQL before forwarding.
proxy/src/main.rs	Adds a standalone vectorize-proxy binary with CLI/env configuration and cache sync listener startup.
proxy/src/embeddings.rs	Implements parse_search_calls and rewrite_search_query that expands vectorize.search() into hybrid-search SQL rows.
proxy/README.md	Documents how to run the proxy and query vectorize.search() through it.
proxy/Cargo.toml	Adds bin/lib sections, clap dependency, and dev-dependencies.
docker-compose.yml	Bumps the Postgres/pgvector image tag.
core/src/query.rs	Refactors hybrid-search SQL generation and introduces hybrid_search_query_rows for non-JSON row results.
Cargo.lock	Updates lockfile for added/changed dependencies.

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