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Currently Aurora PG does not support multi-primary. Since this testing is done periodically, one option would be to restore a snapshot every time for simulation. Second option would be the promote read replica and delete the read-replica after the testing. With this, you need to create new read-replica every time. https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PostgreSQL.Replication.ReadReplicas.html#USER_PostgreSQL.Replication.ReadReplicas.Limitations
Another option would be to keep two active read-write databases. To configure this, you can first restore a snapshot and then keep a DMS instance to replicate changes from source to target instance. https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Target.PostgreSQL.html
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