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Re:Writing a Postgres Foreign Data Wrapper for Clickhouse in Go by arunk-s on Thursday November 19, 2020 @04:17PM (#25154468)
I definitely think they are used in production though I haven't tried it myself.

But I can find ancedots of people using it production on the web[1].

1: https://carto.com/blog/postgres-fdw/

Re:Writing a Postgres Foreign Data Wrapper for Clickhouse in Go by noefingway on Thursday November 19, 2020 @05:50PM (#25155305)
Currently using this one https://github.com/pramsey/pgsql-ogr-fdw for an image migration project. Using it to pull image metadata thru ODBC. While it's primary design is for GIS data, it works well for any ODBC database.