Right now the supported Vector stores are Chroma (which you can self-host), Pinecone and Astra. Adding a new vector store is quite easy: you just need to extend the VectorStore class (https://github.com/Dataherald/dataherald/tree/main/services/...) and set it as the Vector store module to be used in the environment variable https://github.com/Dataherald/dataherald/blob/main/services/...