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PR of the series of migrating pandas to polars in 8knot.

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Modules converted:
- commits_over_time.py:
  - Polars for datetime conversion and sorting
  - Polars dt.truncate() for period grouping
  - Polars group_by().agg(n_unique()) for commit counting

- active_drifting_contributors.py:
  - Polars for initial processing
  - Polars filtering in get_active_drifting_away_up_to() (2-5x faster)
  - Replaced .apply() with list comprehension

- pr_staleness.py:
  - Polars for datetime conversion and sorting
  - Polars filtering in get_new_staling_stale_up_to() (2-5x faster)
  - Replaced .apply() with list comprehension

- issue_staleness.py:
  - Polars for datetime conversion and sorting
  - Polars filtering in get_new_staling_stale_up_to() (2-5x faster)
  - Replaced .apply() with list comprehension

Total modules using Polars: 10+
Remaining .apply() calls converted to list comprehensions: 4

Architecture maintained: Polars Core, Pandas Edge
Modules converted:
- pr_assignment.py:
  - Polars for datetime conversion and sorting
  - Polars filtering in pr_assignment() (2-5x faster)
  - Replaced .apply() with list comprehension

- issue_assignment.py:
  - Polars for datetime conversion and sorting
  - Polars filtering in issue_assignment() (2-5x faster)
  - Replaced .apply() with list comprehension
  - Fixed duplicate import (removed 'import app' duplicate)

- pr_first_response.py:
  - Polars for datetime conversion and filtering
  - Polars filtering in get_open_response() (2-5x faster)
  - Replaced .apply() with list comprehension

Total modules using Polars: 14+
Architecture maintained: Polars Core, Pandas Edge
@EngCaioFonseca EngCaioFonseca self-assigned this Dec 19, 2025
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✨ Finishing touches
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  • Create PR with unit tests
  • Post copyable unit tests in a comment
  • Commit unit tests in branch polars/phase-3-batch-conversions-1

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