1. Remove hard coded `/tmp` folder. At the very least, use `NSTemporaryDirectory`. You can also use `URLForDirectory` with `NSItemReplacementDirectory`, but I agree [with NSHipster says](http://nshipster.com/nstemporarydirectory/) that `NSTemporaryDirectory` is fine.
2. Comment out `[db release]` because for 99% of users, now, this isn't appropriate. But `nil` the pointer either way (in MRC, eliminate dangling pointer reference, in ARC, remove your strong reference).