Reduce scheduler polling noise

server/internal/scheduler/control_plane_test.go

@@ -45,3 +45,47 @@ func TestNextIntervalAutoAtSchedulesAfterCurrentCompletion(t *testing.T) {
 		t.Fatalf("nextIntervalAutoAt() = %s, want %s", got, want)
 	}
 }
+
+func TestIsEmptySuccessRunRequiresConfiguredZeroMetrics(t *testing.T) {
+	stats := map[string]any{
+		"hydrated_count": 0,
+		"claimed_count":  0,
+	}
+	config := map[string]any{
+		"suppress_empty_success_runs": true,
+		"empty_success_metric_keys":   []any{"hydrated_count", "claimed_count"},
+	}
+
+	if !isEmptySuccessRun(stats, config) {
+		t.Fatal("expected empty success run to be suppressed")
+	}
+}
+
+func TestIsEmptySuccessRunKeepsRunsWithOutput(t *testing.T) {
+	stats := map[string]any{
+		"recoverable_count": 1,
+		"republished_count": 0,
+	}
+	config := map[string]any{
+		"suppress_empty_success_runs": true,
+		"empty_success_metric_keys":   []any{"recoverable_count", "republished_count"},
+	}
+
+	if isEmptySuccessRun(stats, config) {
+		t.Fatal("expected non-empty success run to be retained")
+	}
+}
+
+func TestShouldSuppressEmptySuccessRunOnlyForAutoNonDryRun(t *testing.T) {
+	config := map[string]any{"suppress_empty_success_runs": true}
+
+	if !shouldSuppressEmptySuccessRun("auto", false, config) {
+		t.Fatal("expected auto non-dry-run to allow suppression")
+	}
+	if shouldSuppressEmptySuccessRun("manual", false, config) {
+		t.Fatal("manual runs must not be suppressed")
+	}
+	if shouldSuppressEmptySuccessRun("auto", true, config) {
+		t.Fatal("dry runs must not be suppressed")
+	}
+}