@iska #Persistent #ObjectStorage instead of a #filesystem?
Yeah, while there *were* OSes that tried that, most of them died for a number of reasons (including blatantly anticompetitive political shit sometimes).
#Database #storage would qualify too, since most of them can do vacuuming of delete/unused backing storage.
Otherwise, #persistence / #prevalence libraries exist for a few languages but that'll be very program-specific.
@iska The RAM & DB-size assumptions of the prevalence stuff aged *badly* though.
It's common for the database to be an order of magnitude larger than any remotely affordable amount of RAM.