Populate video IDs and fix matching algorithm #2148
Merged
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Previously we would find the best video for each page, but that often meant that the same video would be rendered on two different pages (e.g. a random unconference video would be rendered on the "Unconference" page in addition to its actual page, and the "Welcoming Remarks" video was rendered again on the "Closing Remarks" page which doesn't have a video).
I've changed the algorithm to be video-centric rather than session-centric, so each video will be assigned to the best available session page (rather than the other way around).
I don't have the full context of how all this works, so please check I'm not doing something unnecessarily expensive.