The filter string was filtering out valid values for the Report Generator
delivery mode. This results in the valid string "E-mail" being converted to
a null which then getes converted to "E-mail" on the sql load if the
sql_mode is set empty. _Sigh_

Null is not an allowed value for the not null foreign keys to the organization
and person tables. This change initializes them to a valid value (-1 == Unknown)

You can't call SQL function in PDO parameters. This code changes it so the that call to the MySQL
NOW() function is done good and proper like.

The physical_usage column in the fact table is nullable, but the one in the
aggregates table is not. This updates the load SQL to coalesce the null to 0 if necessary.