[mythtv] [PATCH]DVB setup truncation of dtv_multiplex table

[Nigel Pearson]

> This doesn't make sense to me. If you were on 0.16 and you cleared
> your channel options these tables would have been truncated.

	True, but now that we are 0.17 or later, those old tables are an
informative backup, in case the 0.17/CVS DVB code is somehow broken.


>  So you are
> actively leaving tables that would have been emptied before ?

	More like not clearing tables that don't need
to be cleared, and have some nominally slight value.

(i.e. I can lookup the values without
having to snoop around in database backups,
and can compare the operation of a backend between
a 0.17/CVS tune with 0.16 data, in the same database)



	I think the correct way/time to clear these is via drop
table in dbcheck.cpp, and the correct time is just after 0.18
is released.

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