diff --git a/src/db/migration/V1_1736423100280__palaute_duplicate_cleanup.sql b/src/db/migration/V1_1736423100280__palaute_duplicate_cleanup.sql
new file mode 100644
index 000000000..448d4ff2d
--- /dev/null
+++ b/src/db/migration/V1_1736423100280__palaute_duplicate_cleanup.sql
@@ -0,0 +1,22 @@
+
+DELETE	FROM palautteet p1
+WHERE	p1.jakson_yksiloiva_tunniste IS NULL
+AND	EXISTS (
+	SELECT 1 FROM palautteet p2
+	WHERE	p1.hoks_id = p2.hoks_id
+	AND	p1.kyselytyyppi = p2.kyselytyyppi
+	AND	p2.jakson_yksiloiva_tunniste IS NULL
+	-- here we should also have a condition of having the same
+	-- rahoituskausi, but it's not needed yet because these have
+	-- accumulated only on RK 2024-2025
+	AND	p1.created_at < p2.created_at
+);
+
+DELETE	FROM palautteet p1
+WHERE	EXISTS (
+	SELECT 1 FROM palautteet p2
+	WHERE	p1.hoks_id = p2.hoks_id
+	AND	p1.jakson_yksiloiva_tunniste = p2.jakson_yksiloiva_tunniste
+	AND	p1.created_at < p2.created_at
+);
+