An open-source, on-prem feature flag solution
If you want to look at some example code, I do this same thing in my project Flipt which uses GRPC, Postgres (and optionally MySQL and Sqlite).
Golang gRPC Middlewares: interceptor chaining, auth, logging, retries and more.
I do some basic validation at the server layer using a GRPC interceptor.
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PostgreSQL driver and toolkit for Go
String manipulation could lead to nasty SQL injections and really because you're using pgx there's no need to do that either, see the Conn.SendBatch method, it should allow you to achieve what you're trying to do: execute multiple queries in a transaction and still get their results. (test example)
SQLite in Go, with and without cgo
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