Index: openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl,v
diff -u -r1.15.2.17 -r1.15.2.18
--- openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl	25 Jun 2022 08:25:41 -0000	1.15.2.17
+++ openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl	25 Jun 2022 08:52:11 -0000	1.15.2.18
@@ -902,6 +902,19 @@
       }
     }
 
+    set v 5.10.1d32
+    if {[apm_version_names_compare $from_version_name $v] == -1 &&
+        [apm_version_names_compare $to_version_name $v] > -1} {
+      ns_log notice "-- upgrading to $v"
+
+      if {[::xo::dc 0or1row constraint_exists {
+        SELECT 1 FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
+        WHERE CONSTRAINT_NAME ='xowiki_page_instance_page_template_fkey'
+        AND TABLE_NAME = 'xowiki_page_instance'}]} {
+        ::xo::dc dml alter_constraint \
+            "alter table xowiki_page_instance alter constraint xowiki_page_instance_page_template_fkey DEFERRABLE INITIALLY DEFERRED"
+      }
+    }
   }
 }