Ensure performance insights are enabled for Amazon Relational Database Service (Amazon RDS) instances

Performance insights are disabled for AWS DB instances. This may make audit challenging.

In AWS Console -

1. Sign in to the AWS Console and go to the AWS RDS Console.
2. In the RDS Dashboard, click on Databases.
3. Select Modify to modify the instance of your choice.
4. Modify performance insights in the Performance Insights section to ensure performance insights are enabled.

In Terraform -

1. In the aws_db_instance resource, set the performance_insights_enabled field to true.

References:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PerfInsights.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/db_instance#performance_insights_enabled