I have an example of this with Databento market data. The MCP server was a proof-of-concept and needs improvement, but certainly a good base from fashioning your own specific MCP Tool [1].
This week I'm adding a SQL-based MCP server to my DataBento Golang Tutorial, but it's not there yet. [2]. That step will follow an MCP implementation like this, where it will just give a "sql" endpoint along with other tools to fill the database [3].