We might want a hook for foreign storage

[axch]

meaning, storing the state of a "foreign" metamodel somewhere other than the underlying sqlite3 database. Presumably this hook would want to know about savepoints, commits, and rollbacks.

[riastradh-probcomp]

Example of storage and intended interaction?

[axch]

Any sort of horrible foreign stuff; if I want to plug in a foreign model, written e.g. in VentureScript+Matlab with various legacy things, that has its own persistence code I don't want to rewrite just now, it might be nice if I could have a hook on which to hang code that invokes said persistence code so that when BayesDB reports to my ultimate user that everything has been saved to disk, it actually has. No very concrete use cases, which is why the target milestone is "someday".