Improve leaderboard pagination to preserve loaded users during real-time updates (Issue #227)

[anshul23102]

Summary

Prevent real-time listener from resetting paginated data. When initial leaderboard updates fire, update only the first batch of users while preserving any data loaded via pagination. This ensures that users retain their pagination state while still seeing real-time rank updates for the top 50.

Changes

• Modify real-time listener to merge initial batch with existing paginated data
• Preserve all users loaded beyond the first 50 when updating from real-time listener
• Prevent list resets during routine real-time updates

Testing

1. Navigate to the GitRank leaderboard page
2. View the initial 50 users
3. Click "Load More" to fetch the next 50 users (total 100 displayed)
4. Wait for a few moments to allow real-time listener to fire
5. Verify that users still see all 100 users instead of list resetting to 50
6. Verify that ranks in the initial 50 update in real-time if there are changes
7. Test with different language filters to ensure pagination is preserved correctly

Type of Change

• Performance optimization
• Bug fix

Contributor Declaration

This contribution is original work and I have the right to contribute this code to the project. I understand that the project is licensed under its respective license and my contributions will be available under the same license terms.

Closes #227

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Project	Deployment	Actions	Updated (UTC)
ranker-hub	Ready	Preview, Comment	Jun 3, 2026 7:50pm