Rust generally has large ecosystem, Not only Zig is early, it going to take some time for ecosystem form arround the language and become actually useful for broder audiance. Zig might be useful some folks even that this stage. So use whatever right for your situation.
HelixDB (YC X25) is a Graph vector database, where you can store both data and vector embeddings as graph nodes so your AI agents can seamlessly hybrid query on graph data and similarity search on embeddings.
Check out how you can ingest helixdb node with realtime data from kafka topic and