Derived planned-vs-actual-vs-result summary for one outreach. All aggregate counts are computed from the EFFECTIVE execution set and the event ledger, using the same canonical selector as /effective-state, so the two always agree.

CANONICAL AGGREGATION RULE: an execution that a later record supersedes is history, and of the rows sharing one external execution identity only the newest is effective. Only effective executions and their target-level observations contribute to current totals (sent_confirmed, not_contactable, delivery statuses, bounce counts derived from execution-target rows, recipient counts, execution summary metrics). A correction is a correction to what Forbiz knows about the same real-world batch, never a second send, so a supersession chain never inflates totals. History is never deleted: superseded and earlier corrected records remain readable via GET /outreach/{id}/executions, where each record carries is_effective, and duplicate_execution_rows_ignored reports how many records were excluded from current truth.