Rebuilds more photos than necessary (metadata = 1 hour off)

[rprieto]

On one occasion, thumbsup tried to rebuild more photos than necessary.
Adding some debugging, it seemed that:

file	real date (in Finder)	in thumbsup
source file	Sun May 25 2014 19:09	metadata.json said 1401012582000 (Sun May 25 2014 20:09:42 GMT+1000)
destination thumbmail	Sun May 25 2014 19:40	fs.stat said 1401010814000 (Sun May 25 2014 19:40:14 GMT+1000)

So the cache data (metadata.json) was an hour off, and the destination seemed out of date - when it really wasn't. Deleting metadata.json and doing a full rebuild fixed it.

Note: A diff between the old and rebuilt metadata.json shows many photos where fileDate is exactly 1 hour apart. Since this happened the day after daylight savings, it could be related?

[rprieto]

After a lot of troubleshooting, still can't reproduce. This should be fixed by the move to exiftool-json-db for the database format, which has much better test coverage than the old "metadata" logic.