If you have your RDS backup retention period set to a non-zero value, then change it to zero, all of your automatic snapshots get deleted...at least when deploying via CDK.
Easy to imagine that causing trouble!
DynamoDB Storage Overhead and Billing
The dangers of restoring RDS instances from snapshots
AWS RDS MySQL restore stalling
Restoring a MySQL backup to AWS RDS without the automated post-restore snapshot
Optimizing EC2-S3 transfer throughput / bandwidth utilization