Delete protection can provide assurance that a database cannot be deleted until the instance running that database is first altered to disable the setting. This is enabled by default when choosing the 'production' option during new database instance setup. For more information, see the AWS documentation.
References:
https://aws.amazon.com/about-aws/whats-new/2018/09/amazon-rds-now-provides-database-deletion-protection/
In AWS Console -
In Terraform -