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6fb384635a
- Add explicit warning against .date on datetime index (causes data loss to single year, only 314 entries instead of 2020-2026) - Add explicit warning against df.merge() which destroys MultiIndex (causes RangeIndex output instead of required MultiIndex) - Enforce column name must be exactly factor_name, not a shortened alias - Require transform() over apply() for per-group calculations to preserve row count - Add MultiIndex assertion before saving to result.h5 - Document expected output: ~1500+ daily entries for full 2020-2026 range