Show HN: Marrow – self-hosted semantic search over your Claude Code sessions (github.com)

Marrow, a new self-hosted semantic search engine, has been announced, allowing developers to conduct secure searches over their AI coding sessions powered by Claude Code. This system ingests session transcripts, enabling users to ask questions and receive answers traced back to specific interactions, all while ensuring that data remains private and is never shared outside the user's control. The key technological components include a PostgreSQL database enhanced with pgvector for vector storage and retrieval, which supports both semantic matching and lexical search through a hybrid approach. This development is significant for the AI/ML community as it addresses privacy concerns associated with using cloud-based solutions, offering a robust alternative for organizations that want to maintain their operational data securely. The open-core release of Marrow provides essential functionality—ingesting, retrieving, and citing past coding sessions—while omitting analytics or recommendation features, aligning with a growing demand for privacy-centric tools in software development environments. The product comes with comprehensive setup instructions, making it accessible for developers eager to leverage their coding histories for enhanced productivity without compromising data integrity.