Recoverable jobs

[jqnatividad]

For an existing resource, when a job fails after it has already been deleted from the datastore, there is no easy way to recover.

To avoid this, DP+ should:

• do a "soft-delete" of the table (perhaps, by temporarily renaming it?)
• do the DP+ job as usual
• if the job is successful, drop the "soft-deleted" table. If the job failed, restore the old table