diff --git a/infra/atlas/migrations/20260621040000_init_entries_run_feed_heartbeats.sql b/infra/atlas/migrations/20260621040000_init_entries_run_feed_heartbeats.sql
index c07c98562c..561dc1289b 100644
--- a/infra/atlas/migrations/20260621040000_init_entries_run_feed_heartbeats.sql
+++ b/infra/atlas/migrations/20260621040000_init_entries_run_feed_heartbeats.sql
@@ -16,8 +16,10 @@
 -- key). An UPSERT would need UPDATE, which the append-only cora_app role
 -- is REVOKEd from (test_migration_revokes enforces this for every
 -- entries_* table). Reading MAX(recorded_at) gives the same "newest
--- heartbeat" answer with no mutable state. Retention sweeps prune old
--- ping rows (same posture as the other entries_* tables; BRIN-friendly).
+-- heartbeat" answer with no mutable state. Rows therefore accumulate
+-- without bound: nothing prunes this table today. The only index below
+-- is a (run_id, recorded_at DESC) btree, so a time-range sweep would
+-- need an index of its own before it could run cheaply here.
 --
 -- ## Freshness keys on recorded_at, not heartbeat_at
 --
diff --git a/infra/atlas/migrations/atlas.sum b/infra/atlas/migrations/atlas.sum
index edb9274ab9..7daeaab19f 100644
--- a/infra/atlas/migrations/atlas.sum
+++ b/infra/atlas/migrations/atlas.sum
@@ -1,4 +1,4 @@
-h1:Hh2aacDC3e9ka8TTvNmeD8Zw7LlHWQSMl8waDuzuWL0=
+h1:dnh/fWUfqZPraHDnlG7pcOs20kUk3ampmAsKq9IXLmc=
 20260509120000_init_events.sql h1:GmgCZKfaqXu1m96/cKAks2vhaLWTdEaHTLkFtUo9FXg=
 20260509170000_init_idempotency.sql h1:Nbu8DIE4Sv1WiHw3G22+tYffPhKc5Jryw3PMK8wB2zY=
 20260510010000_add_event_id.sql h1:RbtYP6uMnOB20zhJ9dNXUi4YVqbmlEzf562pmygnRW8=
@@ -147,19 +147,19 @@ h1:Hh2aacDC3e9ka8TTvNmeD8Zw7LlHWQSMl8waDuzuWL0=
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 20260621030000_add_entries_run_observations_run_channel_recorded_idx.sql h1:Diaq8aq1dsFZLjwpLb5SyDHc4IxFaVaj6g3YDW+lkpQ=
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-20260810120000_grant_cora_app_entries_table_access.sql h1:LCngXYBMYN5aS7fy/3Sa8G1C/9KNG+J4GFf5Xh4X2kM=
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