How to automate unloading a database from memory

Is it possible to automate unloading a single database from memory? I already start and stop the services overnight but I have some databases that are loaded into memory when data readers run just before the working day begins. They are taking up memory even though they are used occasionally. I'm happy for these DBs to load when a user opens the capsule. I can't see any options to unload as a procedure. Is it possible to do it from command line?

 

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