Update schema, support pass/fail
change the grade to a double
Save the letter grade
Make the uri unique per scans_id
Add scan record classes
Update SQL

Update field types and names to be more appropriate
Remove the unique uri per scan index

A URI should be able to be scanned multiple times for a scan, without having to rescan the entire site.  That re-scan should not overwrite history.
Use a status field instead of a boolean is_scanned field
add the job id to the scanned_page table
Only Log, don't schedule
Add a method to schedule a scan
add tables to drop
Fix sql errors

workbench has a bug which doesn't export index comments correctly.  Also, use decimal instead of double
Correct the decimal arguments

I didn't understand these correctly and they were invalid.  This should fix them.
Add a method to schedule a scan
Fix spelling error
Add a method to run a scan
add a logger to schedule pages for scan
throw an exception if we can NOT connect
add a method to schedule a scan