On 19 Nov 2014, at 18:47, Brian May <brian@microcomaustralia.com.au> wrote:
This has been raised as a bug report against mythtv, but instead of fixing it (e.g. creating a unique index), the concerns were dismissed :-(

This is very typical of their attitude.  I have raised issues with the developers before, and not a single one was even accepted as existing, let along getting fixed.