diff --git a/src/app/db/schema/recommendations.ts b/src/app/db/schema/recommendations.ts
index 0c74a584..af7acf0e 100644
--- a/src/app/db/schema/recommendations.ts
+++ b/src/app/db/schema/recommendations.ts
@@ -263,6 +263,13 @@ export const planRecommendations = pgTable(
       table.planId,
       table.recommendationId,
     ),
+    // Supports the FK check fired when `recommendation` rows are deleted
+    // (cascaded from plan deletes); without it each delete seq-scans this
+    // ~26M-row table. Already created on the live DB (CONCURRENTLY,
+    // 2026-07-02) — the migration must match the existing index name.
+    index("idx_plan_recommendations_recommendation_id").on(
+      table.recommendationId,
+    ),
   ],
 );