So a user who isn't being careful enough (i.e. me) and supplies a
calculated milliseconds value that happens to be formatted in
exponential notation as above is getting a 3 millisecond (not 5
minute) busy_timeout. And that same careless user is likely
(i.e. was) not checking what the PRAGMA statement prints.
I'm only reporting this because it (i.e. user carelessness) turned out
to be the cause of a long-sought bug in some of my own code.
Hopefully, just this report might save someone else similar grief.
interprocess database-locking, pragma busy_timeout, database is locked