When migrating add several more important sanity checks:
* SHAs must be SHAs
* Refs must be valid Refs
* URLs must be reasonable
Signed-off-by: Andrew Thornton <art27@cantab.net>
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: techknowlogick <matti@mdranta.net>
In #21031 we have discovered that on very big tables postgres will use a
search involving the sort term in preference to the restrictive index.
Therefore we add another index for postgres and update the original migration.
Fix #21031
Signed-off-by: Andrew Thornton <art27@cantab.net>
