Very interesting. I have a question regarding the change from a external periodic process (author mentions two: backup database, and send post-wedding email to

Very interesting. I have a question regarding the change from a external periodic process (author mentions two: backup database, and send post-wedding email to couple) to goroutine: - if fly.io ever needs to scale your app up to > 1 instance, won't couples receive duplicate emails? (similarly, any other background process like database backup would be run in multiplicity)