Rollback of Bug 714370 as it causes error in bug creation due to DB_COLUMNS

Bugzilla/Flag.pm

@@ -65,21 +65,15 @@ use constant AUDIT_REMOVES => 0;
 
 use constant SKIP_REQUESTEE_ON_ERROR => 1;
 
-sub DB_COLUMNS {
-    my $dbh = Bugzilla->dbh;
-    return qw(
-        id
-        type_id
-        bug_id
-        attach_id
-        requestee_id
-        setter_id
-        status), 
-        $dbh->sql_date_format('creation_date', '%Y.%m.%d %H:%i:%s') .
-                              ' AS creation_date', 
-        $dbh->sql_date_format('modification_date', '%Y.%m.%d %H:%i:%s') .
-                              ' AS modification_date';
-}
+use constant DB_COLUMNS => qw(
+    id
+    type_id
+    bug_id
+    attach_id
+    requestee_id
+    setter_id
+    status
+);
 
 use constant UPDATE_COLUMNS => qw(
     requestee_id
@@ -124,14 +118,6 @@ Returns the ID of the attachment this flag belongs to, if any.
 
 Returns the status '+', '-', '?' of the flag.
 
-=item C<creation_date>
-
-Returns the timestamp when the flag was created.
-
-=item C<modification_date>
-
-Returns the timestamp when the flag was last modified.
-
 =back
 
 =cut
@@ -144,8 +130,6 @@ sub attach_id    { return $_[0]->{'attach_id'};    }
 sub status       { return $_[0]->{'status'};       }
 sub setter_id    { return $_[0]->{'setter_id'};    }
 sub requestee_id { return $_[0]->{'requestee_id'}; }
-sub creation_date     { return $_[0]->{'creation_date'};     }
-sub modification_date { return $_[0]->{'modification_date'}; }
 
 ###############################
 ####       Methods         ####
@@ -452,7 +436,6 @@ sub update {
     if (scalar(keys %$changes)) {
         $dbh->do('UPDATE flags SET modification_date = ? WHERE id = ?',
                  undef, ($timestamp, $self->id));
-        $self->{'modification_date'} = format_time($timestamp, '%Y.%m.%d %H:%M:%S');
     }
     return $changes;
 }