Resolves ENGA-932 "Modify BigQueryExporter class export() method to accept a pull_date"

[DevDaveFrame]

ENGA-932

Non-technical Context

For the sake of backfilling or coordinating a pull date across multiple models, we want the export function to accept a pull_date argument

Technical Context

I added the pull_date parameter which defaults to None. The pull_time used internally by the method is then set to either the specified pull_date, or now if no pull_date is set.

As an aside, I added .order_by('id') to the default queryset method to accommodate the batching of querysets where ordering avoids reprocessing or missing records.

Developer

• Ensure code complies with the style guide
• Devise edge cases to test the bug fix or feature being merged
• Make sure the code is clean and understandable
• Ensure code is not overly inefficient
• Code changes include a migration
  • Migration modifies large table and has been run against full db to estimate completion time
  • Migration modifies a small table and has only been run against slim db
  • There are no conflicting migration leaf nodes
• Ensure documentation is understandable and accurate, including:
  • Code comments and doc strings
  • Technical documentation

Reviewer

• Ensure code complies with the style guide
  • If there are few or minor issues, add inline comments
  • If there are many issues or it seems like the developer did not follow the style guide, leave a comment asking them to do so
• Devise edge cases to test the bug fix or feature being merged
• Make sure the code is clean and understandable
  • Ask for inline comments on unclear sections
• Ensure code is not overly inefficient
• Ensure documentation is understandable and accurate, including:
  • Code comments and doc strings
  • Technical documentation
• There are no conflicting migration leaf nodes

[echan217]

LGTM!