ELB simpleworkflow usage excessive

[sjones4]

ELB uses the simpleworkflow service for periodic tasks, this generates a large amount of data that is retained for a day in the simpleworkflow database. For ~20 ELBs there is over 2GB of data, which is many times all other database schemas combined.

Example showing largest two tables:

       table_schema        |              table_name          | row_estimate |   total    |   index    |   toast    |   table    
---------------------------+----------------------------------+--------------+------------+------------+------------+-----------
 eucalyptus_simpleworkflow | swf_workflow_history_event       |  6.95791e+06 | 3431 MB    | 1176 MB    | 16 MB      | 2239 MB
 eucalyptus_autoscaling    | metadata_scaling_activity_causes |       348332 | 86 MB      | 20 MB      | 8192 bytes | 67 MB

We could reduce the frequency and size (input/output) for problematic workflow activities.