Kusto query for table size, number of entries, isBillable, recency in AZ log analytics

LogAnalyticsTableSize.kql

union withsource=TableName1 *
| where TimeGenerated > ago(30d)
| summarize
    Entries = count(),
    Size = sum(_BilledSize),
    last_log = datetime_diff("second", now(), max(TimeGenerated)),
    estimate = sumif(_BilledSize, _IsBillable == true)
    by TableName1, _IsBillable
| project
    ['Table Name'] = TableName1,
    ['Table Entries'] = Entries,
    ['Table Size'] = Size,
    ['Size per Entry'] = 1.0 * Size / Entries,
    ['IsBillable'] = _IsBillable,
    ['Last Entry Ago (s)'] = last_log,
    ['Estimated Table Price'] = (estimate / (1024 * 1024 * 1024)) * 0.0
| order by ['Table Size'] desc