Renamed an RDS, now can't fully terminate an EB instance

While trying to debug a database problem, I manually renamed the RDS created as part of an EB instance. I eventually wanted to tear down the EB and start over, so I ran eb terminate <env name>. I got an error talking about an inability to find the RDS under its old name, and then two more errors relating to failed security group deletions due to dependency violations. The final error reads

Stack deletion failed: The following resource(s) failed to delete: AWSEBSecurityGroup, AWSEBRDSDatabase, AWSEBLoadBalancerSecurityGroup.

How can I terminate the dangling resources and finalize the termination of the EB instance?

Edited by: nbarnes on Mar 30, 2019 1:47 PM