Expand description
Tier policy for access-pattern-driven bit-width selection.
Score = access_count * 1024 / (now_ts - last_access_ts + 1)
| Tier | Condition | Bits |
|---|---|---|
| Hot | score >= hot_min_score | 8 |
| Warm | score >= warm_min_score | warm_bits (7 or 5) |
| Cold | otherwise | 3 |