No, but previous workplace did fake it with a postgres-compatible front end (in node.js) which pointed to per-customer postgres schema with no data, but views/e

No, but previous workplace did fake it with a postgres-compatible front end (in node.js) which pointed to per-customer postgres schema with no data, but views/etc pointing to a multi-tenant schema with the actual data. Between the views and the fake front-end we could isolate customer data and provide hierarchical data access, allowing our customers to point pg-compatible tools to access their data. I suspect there was negative ROI, and the DBAs avoided me.