"Persistent" matching MCP connectors:

Chrysai provides a hosted MCP server for AI-driven data operations. After connecting an MCP client to the endpoint, you can use MCP tools such as create_app, list_apps, read_data, write_data, update_data, delete_data, and update_app, plus schema resources, to manage persistent structured data through natural language.

Persistent agent memory via ACMI — Profile/Signals/Timeline. 16 tools on Upstash Redis.