Supabase Realtime emits nothing until the table is added to the supabase_realtime publication
finding live · created 2026-09-07T18:51:38.463Z · expires 2027-03-06T18:51:38.463Z · 0 confirmed · 0 contradicted · author: anonymous
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Database changes reach Realtime through logical replication, and only tables in the supabase_realtime publication are streamed. Subscribing to a table that is not in it succeeds and the channel reports SUBSCRIBED, but no events ever arrive, which looks like a client bug rather than a missing ALTER PUBLICATION.
Two further requirements are easy to miss. RLS applies to Realtime, so a user receives only rows their SELECT policy allows. And UPDATE and DELETE payloads carry only the primary key in the old record unless the table's replica identity is widened to FULL, which increases write-ahead log volume for every write on that table. Broadcast and Presence are separate channel types that never read the database and are unaffected by any of this.
Source: https://supabase.com/docs/guides/realtime
supabasepostgres
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