Apply remaining pricelist and local-first updates

internal/localdb/migrations.go

@@ -42,6 +42,11 @@ var localMigrations = []localMigration{
 		name: "Create default projects and attach existing configurations",
 		run:  backfillProjectsForConfigurations,
 	},
+	{
+		id:   "2026_02_06_pricelist_backfill",
+		name: "Attach existing configurations to latest local pricelist and recalc usage",
+		run:  backfillConfigurationPricelists,
+	},
 }
 
 func runLocalMigrations(db *gorm.DB) error {
@@ -192,6 +197,40 @@ func ensureDefaultProjectTx(tx *gorm.DB, ownerUsername string) (*LocalProject, e
 	return &project, nil
 }
 
+func backfillConfigurationPricelists(tx *gorm.DB) error {
+	var latest LocalPricelist
+	if err := tx.Order("created_at DESC").First(&latest).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil
+		}
+		return fmt.Errorf("load latest local pricelist: %w", err)
+	}
+
+	if err := tx.Model(&LocalConfiguration{}).
+		Where("pricelist_id IS NULL").
+		Update("pricelist_id", latest.ServerID).Error; err != nil {
+		return fmt.Errorf("backfill configuration pricelist_id: %w", err)
+	}
+
+	if err := tx.Model(&LocalPricelist{}).Where("1 = 1").Update("is_used", false).Error; err != nil {
+		return fmt.Errorf("reset local pricelist usage flags: %w", err)
+	}
+
+	if err := tx.Exec(`
+		UPDATE local_pricelists
+		SET is_used = 1
+		WHERE server_id IN (
+			SELECT DISTINCT pricelist_id
+			FROM local_configurations
+			WHERE pricelist_id IS NOT NULL AND is_active = 1
+		)
+	`).Error; err != nil {
+		return fmt.Errorf("recalculate local pricelist usage flags: %w", err)
+	}
+
+	return nil
+}
+
 func chooseNonZeroTime(candidate time.Time, fallback time.Time) time.Time {
 	if candidate.IsZero() {
 		return fallback