diff --git a/backend/internal/repository/migrations_schema_integration_test.go b/backend/internal/repository/migrations_schema_integration_test.go
index 7ef82f0cb3..7d5f66c7f5 100644
--- a/backend/internal/repository/migrations_schema_integration_test.go
+++ b/backend/internal/repository/migrations_schema_integration_test.go
@@ -32,6 +32,7 @@ func TestMigrationsRunner_IsIdempotent_AndSchemaIsUpToDate(t *testing.T) {
 	requireColumn(t, tx, "accounts", "rate_limit_reset_at", "timestamp with time zone", 0, true)
 	requireColumn(t, tx, "accounts", "overload_until", "timestamp with time zone", 0, true)
 	requireColumn(t, tx, "accounts", "session_window_status", "character varying", 20, true)
+	requireIndex(t, tx, "accounts", "idx_accounts_autopause_expiry_due")
 
 	// api_keys: key length should be 128
 	requireColumn(t, tx, "api_keys", "key", "character varying", 128, false)
diff --git a/backend/migrations/151_account_autopause_expiry_index_notx.sql b/backend/migrations/151_account_autopause_expiry_index_notx.sql
new file mode 100644
index 0000000000..4fdca30800
--- /dev/null
+++ b/backend/migrations/151_account_autopause_expiry_index_notx.sql
@@ -0,0 +1,6 @@
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_accounts_autopause_expiry_due
+    ON accounts (expires_at)
+    WHERE deleted_at IS NULL
+      AND schedulable = TRUE
+      AND auto_pause_on_expired = TRUE
+      AND expires_at IS NOT NULL;
diff --git a/backend/migrations/auth_identity_payment_migrations_regression_test.go b/backend/migrations/auth_identity_payment_migrations_regression_test.go
index d122a3b75a..047ea7de8a 100644
--- a/backend/migrations/auth_identity_payment_migrations_regression_test.go
+++ b/backend/migrations/auth_identity_payment_migrations_regression_test.go
@@ -155,3 +155,16 @@ func TestMigration135AllowsGitHubAndGoogleAuthProviders(t *testing.T) {
 	require.Contains(t, sql, "'github'")
 	require.Contains(t, sql, "'google'")
 }
+
+func TestMigration151AddsAccountAutoPauseExpiryPartialIndex(t *testing.T) {
+	content, err := FS.ReadFile("151_account_autopause_expiry_index_notx.sql")
+	require.NoError(t, err)
+
+	sql := string(content)
+	require.Contains(t, sql, "CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_accounts_autopause_expiry_due")
+	require.Contains(t, sql, "ON accounts (expires_at)")
+	require.Contains(t, sql, "WHERE deleted_at IS NULL")
+	require.Contains(t, sql, "schedulable = TRUE")
+	require.Contains(t, sql, "auto_pause_on_expired = TRUE")
+	require.Contains(t, sql, "expires_at IS NOT NULL")
+}