[INTF25] Implement Delegation Algorithm & Mutator

[ruiichen]

Notion ticket link

Ticket Name

Implementation description

• Added the delegation algorithm.
• Added the GraphQL endpoint to trigger the delegation algorithm

Steps to test

1. Drop everything from your reviewed_applicant_records table: DELETE FROM reviewed_applicant_records;
2. Take a look at the applicant_records table: SELECT * FROM applicant_records WHERE position='VP Engineering';
3. Take a look at the users table: SELECT * FROM users WHERE position='VP Engineering';
4. Run the GQL mutator

mutation {
  delegateReviewers(
    positions: ["VP Engineering"]
  ) {
    applicantRecordId
  }
}

``` mutation { delegateReviewers( positions: ["Developer"] ) { applicantRecordId } } ```

What should reviewers focus on?

• 💀 if it works
• Note: if there are an odd number of users with a position, the corresponding applicant record will only have one reviewed applicant record. This is intentional. We will just let the VPEs decide what to do.

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[isabellehuangg]

Algorithm makes sense to me! Just added a comment for code clarity

[isabellehuangg]

NIT: Could FSM.get(record.position)![1] be replaced by userIds from line 220?

[mxc-maggiechen]

LGTM!