Core/syncer diff bug
Created by: keegancsmith
Current state: Postgres does not seem to be able to update where repos "swap" names. I am running into unique name constraints violations. The code currently contains hacky attempts to update the SQL query to work around this.
Alternative to https://github.com/sourcegraph/sourcegraph/pull/3682 Fixes https://github.com/sourcegraph/sourcegraph/issues/3680