We now require CoreNLP listening on port :9000. We will have to find
a way to spin that up in CI as well.

This was removed from `dev` and was causing the DB tests to fail.

IF NOT EXISTS makes sense only when you provide the name of the index.

Unique index is necessary when one wants to refresh the view
concurrently.

This is so that we correctly order _a_history later.

This doesn't work with locks yet.

Read in backend works now, insert and upsert not yet.