From 936baf7e145a3f34bd61730cdee8b10c1d1f9713 Mon Sep 17 00:00:00 2001
From: Charles Haley <cbhaley@i.wont.say.com>
Date: Tue, 10 Sep 2013 10:46:53 +0200
Subject: [PATCH] Force a metadata backup when adding, deleting, or changing
 the structure/metadata of a custom column.

---
 src/calibre/gui2/library/models.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/library/models.py b/src/calibre/gui2/library/models.py
index 3d46b0e01e..58dcb6245e 100644
--- a/src/calibre/gui2/library/models.py
+++ b/src/calibre/gui2/library/models.py
@@ -937,7 +937,8 @@ class BooksModel(QAbstractTableModel):  # {{{
             tmpl = unicode(value.toString()).strip()
             disp = cc['display']
             disp['composite_template'] = tmpl
-            self.db.set_custom_column_metadata(cc['colnum'], display=disp)
+            self.db.set_custom_column_metadata(cc['colnum'], display=disp,
+                                               immediate_backup=True)
             self.refresh(reset=True)
             return True