Versioning of questions: when editing questions the teacher is told about the quizzes in which the question is used and is asked whether to replace them with the new version or not. If there are already attempts at a question than the original version is always kept in the database for audit purposes. More details at http://moodle.org/mod/forum/discuss.php?d=16479

mod/quiz/db/postgres7.sql

@@ -202,6 +202,20 @@ CREATE INDEX prefix_quiz_question_grades_question_idx ON prefix_quiz_question_gr
 
 # --------------------------------------------------------
 
+#
+# Table structure for table `quiz_question_version`
+#
+
+CREATE TABLE prefix_quiz_question_version (
+  id SERIAL PRIMARY KEY,
+  quiz integer NOT NULL default '0',
+  oldquestion integer NOT NULL default '0',
+  newquestion integer NOT NULL default '0',
+  userid integer NOT NULL default '0',
+  timestamp integer NOT NULL default '0'
+);
+# --------------------------------------------------------
+
 #
 # Table structure for table quiz_questions
 #
@@ -216,7 +230,8 @@ CREATE TABLE prefix_quiz_questions (
   defaultgrade integer NOT NULL default '1',
   qtype integer NOT NULL default '0',
   stamp varchar(255) NOT NULL default '',
-  version integer NOT NULL default '1'
+  version integer NOT NULL default '1',
+  hidden integer NOT NULL default '0'
 );
 
 CREATE INDEX prefix_quiz_questions_category_idx ON prefix_quiz_questions (category);
@@ -243,6 +258,7 @@ CREATE TABLE prefix_quiz_responses (
   id SERIAL PRIMARY KEY,
   attempt integer NOT NULL default '0',
   question integer NOT NULL default '0',
+  originalquestion integer NOT NULL default '0',
   answer text NOT NULL default '',
   grade varchar(10) NOT NULL default '0.0'
 );