Built a real MCP-backed persistent memory system for Claude (MemoryGate)

* PostgreSQL + pgvector * Unified semantic search across observations, concepts, documents * Knowledge graph with aliases + relationships * Google Docs as canonical content, MemoryGate as navigational memory * Cold-start “hello” immediately bootstraps context This isn’t prompt memory — Claude queries an external memory service via MCP and reconstitutes context on demand. Repo: [https://github.com/PStryder/memorygate](https://github.com/PStryder/memorygate) Happy to answer questions or share design details.