Simplify cache rotation to monthly (year-month) #4509
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Replace the complex 28-day modulo logic with a year-month approach that rotates the cache 12 times per year.
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Pull request overview
This PR simplifies the cache key determination logic by replacing a complex 28-day modulo-based rotation with a straightforward monthly (year-month) format. This provides more predictable cache behavior with 12 cache rotations per year instead of the previous irregular pattern.
Key changes:
- Replaced day-of-year modulo logic with simple year-month date formatting
- Updated comments to reflect the new monthly rotation approach
- Removed conditional logic that alternated between date-based keys and "latest"
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aruiz14
approved these changes
Jan 9, 2026
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Replace the complex 28-day modulo logic with a year-month approach that rotates the cache 12 times per year.