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Interesting. I am working on a project to integrate access management to iceberg/parquet files for sagemaker. Controlling what users logged into sagemaker studio have access to in s3. It’s fine using static policies for mvp, but eventually it needs to be dynamic and integrated into enterprise iam tools. Those tools generally have great support for managing sql grants. Not so much for s3 bucket policies.

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DuckDB secrets management supports custom IAM roles and the like; at this point we are basically treating the pgduck_server external system as a black box.

For the postgres grants themselves, we provide privs to allow read/write to the remote tables, which is done via granting the `pg_lake_read`, `pg_lake_write` or `pg_lake_read_write` grants. This is a blanket all-or-nothing grant, however, so would need some design work/patching to support per-relation grants, say.

(You could probably get away with making roles in postgres that have the appropriate read/write grant, then only granting those specific roles to a given relation, so it's probably doable though a little clunky at the moment.)

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