[em500]

"Production" can mean many different things to different people. It's very widely used as a backend strutured file format in Android and iOS/macOS (e.g. for appls like Notes, Photos). Is that "production"? It's not widely used and largely inappropriate for applications with many concurrent writes.

Sqlite docs has a good overview of appropriate and inappropriate uses: https://sqlite.org/whentouse.html It's best to start with Section 2 "Situations Where A Client/Server RDBMS May Work Better"