1/ Run clean install from cvshead
2/ Run check defaults script.
3/ Table: forum_discussions. Field: groupid, Expected '-1' Actual '(-1)'

ALTER TABLE mdl_forum_discussions ADD groupid_alter_column_tmp BIGINT;
UPDATE mdl_forum_discussions SET groupid_alter_column_tmp = groupid;
ALTER TABLE mdl_forum_discussions DROP COLUMN groupid;
ALTER TABLE mdl_forum_discussions RENAME COLUMN groupid_alter_column_tmp TO groupid;
ALTER TABLE mdl_forum_discussions ALTER COLUMN groupid SET DEFAULT -1;
ALTER TABLE mdl_forum_discussions ALTER COLUMN groupid SET NOT NULL;