Commits on Mar 25, 2024

1. Fixed email_recipients indexes to match query usage …

   closes https://linear.app/tryghost/issue/ENG-791/migration-to-fix-email-recipients-indexes
   
   Our indexes over single columns (`delivered_at`, `opened_at`, `failed_at`) were ineffective because the only time we query those is alongside `email_id` meaning we were frequently performing full table scans on very large tables during our email analytics jobs.
   
   - added migration to add new indexes covering `email_id` and the respective columns
   - added migration to drop the old indexes that weren't being used in any query plans

   

   kevinansfield committed Mar 25, 2024
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