migrate timestamp fields to timestamptz

[syphar]

with some time on my hands I started on #1067 with the migration to timezone aware datetime fields.
In general I believe it's a good idea to be explicit about timezones also on the database level.

As we see, it simplifies quite some code :)

I'm happy to apply any changes needed (the column defaults actually don't have to be changed, since NOW() and CURRENT TIMESTAMP already are timezone aware)

Tests work locally, not sure what else needs to be tested.

[jyn514]

Looks good to me.

r? @Nemo157

[syphar]

@jyn514 @Nemo157 not sure who does deploy this,

while working on another issue I ran into a panic in rustwide_builder caused by this change, seems like that part is not covered with tests.

I'll build a quick fix for that

[syphar]

first I have to check if that's related to me running the builder in the web container

[syphar]

forget what I said, likely my mistake. The web Dockerfile copies the local release build to the container, which likely was outdated.

Just building and checking