title: Upgrade to Quartz 2.2 JDBC Jobstore new Column Sched_time
body: <p>I am currently upgrading Quartz to version 2.2. Therefore I had to do some migrations on the Tables which are used by the JDBCJobstore.</p>
  
  <p>For the table "qrtz_fired_triggers" there was added the column "sched_time" with a Not Null constraint.</p>
  
  <p>Actually I now ran into the issue, that there is an entry in this table, which results in, that I can't add the NotNull constraint.</p>
  
  <p>Does anyone have a clue, what a possible default value for this column could be, without breaking the functionallity of Quartz?</p>
  
  <p>Thanks in Advance!</p>