Re-name columns named "start" and "end"

[maneesha]

Two tables in AMY use start and end as a column name. Since end is also a PostgreSQL reserved word and start is a SQL reserved word, it causes problems when running SQL queries. SQLite was more forgiving, but as PostgreSQL is stricter, this should be fixed, renaming start and end to start_date and end_date.

Tables with start and end columns:

• extrequests_selforganisedsubmission
• workshops_event

[pbanaszkiewicz]

A migration and possibly quite some changes in templates required.

[maneesha]

We had a community member create a PR long ago that I closed becuase I didn't think the PR does everything it needs to, and would be reluctant to merge it as it would break many of our external queries.

It makes writing SQL queries a bit annoying as we have to do something to escape the reserved words. I'm not sure if this could potentially cause other problems as well, so I would defer to @elichad and @pbanaszkiewicz on what to do next.

[pbanaszkiewicz]

I think we can make this change, it's just a matter of finding all the places that use the old names and updating them. @maneesha Feel free to add this to the next milestone.

[pbanaszkiewicz]

Note: we now have other models with these fields too, for example CommunityRole.