Auto merge of #1996 - bruceadams:no-trigger-during-import, r=smarnach
Auto merge of #1996 - bruceadams:no-trigger-during-import, r=smarnach

Disable database triggers during import

- This allows `updated_at` field values to be loaded during import.
  Before this change, `updated_at` was set to when the import ran,
  overwriting the values being loaded.
- Also, the import completes in about one fifth the time
  (on my slow MacBook Air).

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io