Overwriting lower quality files

[MrBrunes]

I've just realised that some of my historical downloads of TOTP are in
SD or non-50fps HD but the download history doesn't seem to note the
quality, so I need to force download them again. Since new programmes
are currently made available each week (for 30d) I thought I could add
"force 1" to the PVR search for that programme, but then this will
obvs download files that are already in 50fps. Also it will keep
downloading files each time they are made available.

I thought of deleting all the TOTP lines in download_history as that
at least would prevent them from being downloaded again subsequently,
but I don't know if this is an easy thing to do (can't see if my text
editor can do this (Notepad++).

Is there a better, more efficient method of doing this?