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All the VM information is stored in the instances table. 
This includes all the time related field like scheduled_at, launched_at etc.

After upgrading to Juno, I have noticed that my 'scheduled_at' field
is not getting reflected at all in the database. I do see my VMs
being spawned and running just fine. However, the 'launched_at' time 
does get reflected rightly.


MariaDB [nova]> select created_at, deleted_at, host,scheduled_at, launched_at from instances;
+---------------------+---------------------+-----------------------+--------------+---------------------+
| created_at          | deleted_at          | host                  | scheduled_at | launched_at         |
+---------------------+---------------------+-----------------------+--------------+---------------------+
| 2015-03-09 20:00:41 | 2015-03-10 17:12:11 | localhost             | NULL         | 2015-03-09 20:01:30 |
| 2015-03-11 05:53:13 | NULL                | localhost	            | NULL         | 2015-03-18 19:48:12 |


Can anyone let me know if this is a genuine issue or have there been
a recent change in regard to updating this field ? 

I am basically trying to find as to how long a particular VM is running on a given host.
I was using the current time - scheduled time for the same.
Is there a better way to get this value ?

Regards,