When switching libraries update news scheduler since custom recipes are stored in the db

src/calibre/gui2/dialogs/scheduler.py

@@ -235,6 +235,7 @@ class Scheduler(QObject):
         self.oldest = gconf['oldest_news']
         self.oldest_timer.start(int(60 * 60000))
         self.oldest_check()
+        self.database_changed = self.recipe_model.database_changed
 
     def oldest_check(self):
         if self.oldest > 0:

src/calibre/gui2/ui.py

@@ -394,6 +394,7 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
         self.search.clear_to_help()
         self.book_details.reset_info()
         self.library_view.model().count_changed()
+        self.scheduler.database_changed(db)
         prefs['library_path'] = self.library_path
 
     def show_book_info(self, *args):

src/calibre/web/feeds/recipes/model.py

@@ -9,7 +9,7 @@ __docformat__ = 'restructuredtext en'
 import os, copy
 
 from PyQt4.Qt import QAbstractItemModel, QVariant, Qt, QColor, QFont, QIcon, \
-        QModelIndex, SIGNAL
+        QModelIndex, SIGNAL, QMetaObject, pyqtSlot
 
 from calibre.utils.search_query_parser import SearchQueryParser
 from calibre.gui2 import NONE
@@ -131,6 +131,16 @@ class RecipeModel(QAbstractItemModel, SearchQueryParser):
         self.scheduler_config = SchedulerConfig()
         self.do_refresh()
 
+    @pyqtSlot()
+    def do_database_change(self):
+        self.db = self.newdb
+        self.newdb = None
+        self.do_refresh()
+
+    def database_changed(self, db):
+        self.newdb = db
+        QMetaObject.invokeMethod(self, 'do_database_change', Qt.QueuedConnection)
+
     def get_builtin_recipe(self, urn, download=True):
         if download:
             try: