windowValue mapped only the 24h/7d keys and used `?? row.d30` as the fallback:
const col = { '24h': row.d1, '7d': row.d7 }[key] ?? row.d30
so a null d1/d7 (which the function is documented to tolerate) returned the
30-day count instead of 0, inflating the 24h/7d moderation tiles. It happens to
be masked today because `SUM(created_at >= ?)` nulls d1/d7/d30 only in unison,
but the contract is wrong and the existing test used an all-null row that hid it.
Map all three window keys explicitly so each reads its own column and a null
coerces to 0 via `Number(col) || 0`. Add a regression test with a null narrow
column and a non-null d30.
Co-Authored-By: Claude <noreply@anthropic.com>
