Curious what you mean by switching from Aurora to Postgres? AWS offers Postgres on Aurora, and Postgres on regular RDS. Do you mean you switched to RDS, or off of AWS altogether, or something else?
Probably means Aurora MySQL. In CloudFormation and other AWS artifacts, "Aurora" is a keyword that regularly comes up meaning MySQL, since that was the original target for Aurora years before the Postgres flavor was released. There are AWS old-timers at my shop that call it Aurora, and it shows up in their YAML.
To whomever downvoted, when specifying the AWS::RDS::DBCluster "Engine" property in CloudFormation, aurora = mysql5.6 and below, aurora-mysql = mysql5.7 or mysql8.x, aurora-postgresql = postgres. Since 5.6 was deprecated, the "aurora" engine type was removed the CF docs, but it was there until a few years ago. "Aurora" was synonymous with MySQL for a while.
People downvoted because you were assuming that when someone says "we moved to postgres" they would mean "we moved to mysql" as if they wouldn't know what they were talking about.
Even your history thing makes no sense, Aurora Postgres was launched 9 months after Mysql version in July 2015.
> People downvoted because you were assuming that when someone says "we moved to postgres" they would mean "we moved to mysql" as if they wouldn't know what they were talking about.
What? That's not what that comment says at all. They're saying that aurora mysql was a plausible interpretation of what OP moved from, before OP clarified.