Show HN: Streambed – Stream Postgres to Iceberg on S3, Supports Postgres Wire

Re:Show HN: Streambed – Stream Postgres to Iceberg on S3, Su... by saxenaabhi on Monday June 01, 2026 @08:16AM (#48355821)

Hey vira28, thanks a lot for your work. This is a very promising project because other alternative like supabase/etl, Kuvasz-streamer, Sequin all have some subtle issues.

Few questions: 1) For a supabase project can we setup replication slot on replica instead of primary? https://sequinstream.com/docs/reference/databases#using-sequ...

2) For a planetscale cluster are the replication slots on primary or the follower nodes?

I'm asking because isn't setting up slots on primary riskier than setting them on replicas/followers? Because If you have them primary In case of WAL buildup your primary will go down?

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Re:Show HN: Streambed – Stream Postgres to Iceberg on S3, Su... by vira28 on Tuesday June 02, 2026 @12:51AM (#48366205)

Welcome. To avoid primary running out of disk space, you can configure max_slot_wal_keep_size https://www.postgresql.org/docs/17/runtime-config-replicatio...

Since Supabase is vanilla Postgres, streambed should work with replica as the source.

reg, Planetscale, I haven't looked at their offerings yet.

Where do you host your DB currently? Happy to try out with that provider as the source.

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