For a flat-file database that's available online
to a limited number of
people,
a spreadsheet is perfectly adequate. It's probably heresy, but Google docs
would
work.
Yes, I'm sure that's the right kind of solution for on the day and most of
the potential use cases.
I'd imagine that all of the data gathered would be within scope for
Wikidata, though I'm not sure whether Wikidata yet has good structures to
record constituency-level election data. It would be great if it did.
Chris