adding migration

[KarenAJ]

Description: Describe in a couple of sentences how this pull request modifies the repository. Comment on the business context, and highlight any concerns about the changes being introduced.

Issue: Provide the URL for a corresponding issue/work ticket, if applicable.

Dependencies: List dependencies on open pull requests, other issue/work tickets, etc.

Merge Deadline: Indicate the merge deadline date.

Pre-Merge Checklist:

• I have ensured this code follows the style guidelines of this project.
• I have performed a comprehensive self-review of the code.
• I have included comments clarifying hard-to-understand areas of the code.
• I have updated the documentation corresponding to my change(s).
• I have confirmed the code executes properly on my local environment.
• I have confirmed all new/modified data models are structured correctly.
• I have included all necessary database migration files.
• I have verified that all new and existing tests pass.
• I have received approval from the requisite number of reviewers.
• I have squashed all working commits into as few final commits as reasonably possible.
• I have confirmed Github reports all automated tests/checks are passing.

Post-Merge Checklist:

• Delete working branch @ Github repository
• Pull latest master branch to local repository
• Delete working branch @ local repository