add worker-based precalculation of cashbook-values

__init__.py

@@ -16,6 +16,8 @@ from .category import Category
 from .reconciliation import Reconciliation
 from .cbreport import ReconciliationReport
 from .currency import CurrencyRate
+from .valuestore import ValueStore
+from .cron import Cron
 
 
 def register():
@@ -33,6 +35,8 @@ def register():
         OpenCashBookStart,
         RunCbReportStart,
         EnterBookingStart,
+        ValueStore,
+        Cron,
         module='cashbook', type_='model')
     Pool.register(
         ReconciliationReport,