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haxl
A Haskell library that simplifies access to remote data, such as databases or web-based services.
Since you mention Any real-world application uses a database or seventeen in the backend, it's probably worth checking out https://github.com/facebook/Haxl as its goal is to allow you to write high-level queries in Haskell and have the library call out to different datasources as efficiently as possible.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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For prior art in the 'make a quick CRUD app' space, I'd check out https://postgrest.org/ and https://ihp.digitallyinduced.com/, not that I've gotten around to trying either of them.
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ihp
🔥 The fastest way to build type safe web apps. IHP is a new batteries-included web framework optimized for longterm productivity and programmer happiness
For prior art in the 'make a quick CRUD app' space, I'd check out https://postgrest.org/ and https://ihp.digitallyinduced.com/, not that I've gotten around to trying either of them.