Fix generation status query errors when source is deleted. #2361
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Added migration to alter views to not return any generations for sources that do not exist.
Fixes #2360.
There is a problem of consistency in the codebase about when entity graphs are used when the
@transactional
annotation is used, and the use of views to track generation info (ie: the source may be deleted but we can't set a foreign key to a spring batch job table based on astring_value
column. We should have maintained our entity-specific generation status table instead of trying to generically use the job_execution table to store this. We will revisit this decision in WebAPI 3.0.