enhance utilisation of postgres features

internal/settings/settings_strict_test.go

@@ -63,6 +63,45 @@ func TestReadYMLSettingsAppliesAuthDefaults(t *testing.T) {
 	if got.AuthClockSkewSeconds != defaultAuthClockSkewSeconds {
 		t.Fatalf("expected default auth_clock_skew_seconds=%d, got %d", defaultAuthClockSkewSeconds, got.AuthClockSkewSeconds)
 	}
+	if got.CaptureWriteBatchSize != 1000 {
+		t.Fatalf("expected default capture_write_batch_size=1000, got %d", got.CaptureWriteBatchSize)
+	}
+	if got.SnapshotTableCompatMode == nil || !*got.SnapshotTableCompatMode {
+		t.Fatalf("expected default snapshot_table_compat_mode=true, got %#v", got.SnapshotTableCompatMode)
+	}
+	if got.AsyncReportGeneration == nil || !*got.AsyncReportGeneration {
+		t.Fatalf("expected default async_report_generation=true, got %#v", got.AsyncReportGeneration)
+	}
+	if got.PostgresVmHourlyPartitioning == nil || *got.PostgresVmHourlyPartitioning {
+		t.Fatalf("expected default postgres_vm_hourly_partitioning_enabled=false, got %#v", got.PostgresVmHourlyPartitioning)
+	}
+	if got.ScheduledAggregationEngine != scheduledAggregationEngineGo {
+		t.Fatalf("expected default scheduled_aggregation_engine=%q, got %q", scheduledAggregationEngineGo, got.ScheduledAggregationEngine)
+	}
+	if got.MonthlyAggregationGranularity != "daily" {
+		t.Fatalf("expected default monthly_aggregation_granularity=daily, got %q", got.MonthlyAggregationGranularity)
+	}
+}
+
+func TestReadYMLSettingsRejectsInvalidScheduledAggregationEngine(t *testing.T) {
+	tmpDir := t.TempDir()
+	settingsPath := filepath.Join(tmpDir, "vctp.yml")
+	content := `settings:
+  scheduled_aggregation_engine: "hybrid"
+`
+	if err := os.WriteFile(settingsPath, []byte(content), 0o600); err != nil {
+		t.Fatalf("failed to write settings file: %v", err)
+	}
+
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	s := New(logger, settingsPath)
+	err := s.ReadYMLSettings()
+	if err == nil {
+		t.Fatal("expected invalid scheduled_aggregation_engine to fail")
+	}
+	if !strings.Contains(strings.ToLower(err.Error()), "scheduled_aggregation_engine") {
+		t.Fatalf("expected error to mention scheduled_aggregation_engine, got: %v", err)
+	}
 }
 
 func TestReadYMLSettingsRejectsInvalidAuthMode(t *testing.T) {