Datalog patterns for changing data
I am considering using datalog as a database backend for an application I
am writing, because I see potential to allow me to switch between
representations easily without having to sacrifice my collected data or
write a cumbersome migration.
However, I can't foresee how I would deal with changing data -- e.g.
something as simple as a user-changeable password. I had an idea to tag
rows with a date:
changepassword(<user>, <passhash>, <date>)
and then use the latest, but there does not seem to be a way to get the
latest, without returning all rows and filtering them on the application
side.
How are datalog applications designed to handle changing data?
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