Pick one canonical unit for each measure: minutes, grams, milliliters, beats per minute. Convert at ingestion to prevent fragile formulas later. Store ISO timestamps with timezone offsets so evening runs and red-eye flights do not break streaks or daily summaries.
Link habits to events like workouts or meals, and to context like location, weather, and mood. These relationships reveal why success happens. You may discover a simple truth: hydration before meetings doubles focus, or sunlight walks shift sleep onset earlier.





