Speed up ProgramInfo::SavePositionMap() database writes.

Use a single SQL query to save all new position map entries.
This speeds up SavePositionMap by an order of magnitude.

Fixes #12016

Signed-off-by: Jean-Yves Avenard <jyavenard@mythtv.org>
Speed up writing EIT cache to database

Use a single SQL query to write EIT cache to database rather than a series of queries. This significantly speed up disk operations

Ref #12016

Signed-off-by: Jean-Yves Avenard <jyavenard@mythtv.org>