Chris Hill-Scott 1e20cb6be9 Stop searching the to field ...

We were doing this temporarily while the `normalised_to` field was not
populated for letters. Once we have a week of data in the
`normalised_to` field we can stop looking in the `to` field. This should
improve performance because:
- it’s one `WHERE` clause not two
- we had to do `ilike` on the `to` field, because we don’t lowercase its
  contents – even if the two where clauses are somehow paralleized it’s
  is slower than a `like` comparison, which is case-sensitive

Depends on:
- [ ] Tuesday 5 May (7 full days after deploying https://github.com/alphagov/notifications-api/pull/2814)

2020-04-30 10:51:30 +01:00

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