What the sources establish
- Email Log Search, Gmail log events, the Reports API and BigQuery export are distinct evidence surfaces with different access paths.
- Email Log Search delivery records are available for 30 days; Gmail log events are retained for six months.
- BigQuery cost depends on data processed. A LIMIT clause does not generally cap bytes read.
- Partition filters, selected columns, dry runs and maximumBytesBilled can reduce or bound query cost.
PunchOp proposed response
- Start from the incident and identify the smallest relevant evidence source.
- Generate bounded queries with explicit columns and time partitions.
- Show the retention, permission and edition constraints before a search is attempted.
- Separate “no matching event” from “this source cannot contain the event.”
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