This tells us which sheet a row came from
(so we don't need to scan every sheet to find it if we're trying to do
lookups in that direction).
It is also needed in order to tag the videos with the Day number.
This should help prevent changing state to EDITED with any of these fields unset,
which would blow up the cutter.
We also fix up upload_location, which was set up as a sheet input (NOT NULL DEFAULT ''),
and add a similar constraint saying any DONE columns must have non-NULL video link.
* Had to rename `end` as `end` is a reserved word in postgres SQL.
`event_end` is more consistent with `video_end` anyway. Updated `start` to match.
* Added ability to specify channel and stream quality in the editor, which may prove useful
if we have issues with a particular stream quality, or if content needs to be captured from
other channels.
Changed allow_holes and uploader_whitelist to be edit inputs - there's no need for them to come from the sheet; and we'll have an admin dashboard for modifying them if needed.
This solves the problem of rows which don't need a full cut video,
but we'd like to link to an image or a short gif or clip of it.
It is a sheet input that is only used in the output sheet, so it doesn't affect the wubloader itself.
Split UPLOADED into TRANSCODING and DONE, to represent the time after upload
that youtube is transcoding the video and it's not viewable.
Any cutter can poll for the state of a transcoding video and mark it as done.
Add some extra sheet input columns.
I fully expect the exact list of sheet inputs, edit inputs and outputs to change.
The important thing I wanted to codify here was the state machine and the behaviour of the cutters.