Improve performance of signups calendar #4430
Merged
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This should (hopefully) dramatically improve the performance of the signups calendar by rewriting the call for assigned shifts so it stops generating so many DB queries.
There's less that we can immediately do about the call for available jobs, since there's so much processing that happens to figure out what jobs you can actually sign up for. We'll want to tackle that later, but in the meantime, we've added caching to the page so that switching to List view no longer re-fetches jobs from the server (thank you Hayley!).
We also now update the "you are signed up for X hours" text when you sign up for and drop a shift, so people don't have to refresh the page to see their current hours total.