$OpenBSD$
set secure_delete PRAGMA on by default, instead of using internal sqlite copy
--- storage/src/mozStorageConnection.cpp.orig	Sat Mar 19 16:21:29 2011
+++ storage/src/mozStorageConnection.cpp	Sat Mar 19 16:22:05 2011
@@ -464,6 +464,13 @@ Connection::initialize(nsIFile *aDatabaseFile,
     return convertResultCode(srv);
   }
 
+  srv = ::sqlite3_exec(mDBConn, "PRAGMA secure_delete = ON", NULL, NULL, NULL);
+  if (srv != SQLITE_OK) {
+    ::sqlite3_close(mDBConn);
+    mDBConn = nsnull;
+    return convertResultCode(srv);
+  }
+
   // Set the synchronous PRAGMA, according to the preference.
   switch (Service::getSynchronousPref()) {
     case 2: