CORE-4838: added some new tables for job information
CORE-4838: added the not null constraint to the user_id column of the jobs table
CORE-4838: widened the external_id field in the jobs table to 40 characters
CORE-4838: added a column for job status
CORE-4838: added a "deleted" column to the jobs table
CORE-4897: converted the internal identifier in the jobs table to a UUID