Index: pykota-mysql.sql
===================================================================
--- pykota-mysql.sql    (revision 2209)
+++ pykota-mysql.sql    (working copy)
@@ -92,7 +92,7 @@
                         pagecounter INT4 DEFAULT 0,
                         softlimit INT4,
                         hardlimit INT4,
-                        datelimit TIMESTAMP,
+                        datelimit TIMESTAMP NULL DEFAULT NULL,
                         maxjobsize INT4,
                         warncount INT4 DEFAULT 0, 
                         INDEX (userid),
@@ -142,7 +142,7 @@
                          softlimit INT4,
                          hardlimit INT4,
                          maxjobsize INT4,
-                         datelimit TIMESTAMP,
+                         datelimit TIMESTAMP NULL DEFAULT NULL,
                          INDEX (groupid),
                          FOREIGN KEY (groupid) REFERENCES groups(id),
                          INDEX (printerid),