>>davewb+u7
It looks like it's a PostgreSQL extension, and probably not one supported by AWS RDS for PostgreSQL or Aurora PostgreSQL. AWS generally only supports extensions that ship with PostgreSQL (and maybe some limited third-party extensions?).
The lists of supported extensions are here:
* https://docs.aws.amazon.com/AmazonRDS/latest/PostgreSQLRelea...
* https://docs.aws.amazon.com/AmazonRDS/latest/AuroraPostgreSQ...