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Round-2 review feedback on PR #2256: 1. Add explicit dirty-bucket queue (task_usage_daily_dirty) populated by triggers on agent_task_queue (UPDATE OF runtime_id, DELETE) and task_usage (DELETE). The rollup window function drains both this queue and the updated_at-based discovery, so runtime reassignment and issue-cascade deletes no longer leave the rollup divergent from the raw query. Triggers join via agent (not issue) to look up workspace_id, because when the cascade comes from issue, the issue row is already gone by the time atq's BEFORE DELETE fires; agent stays alive. 2. Make migration 072 online-safe: only ADD COLUMN updated_at TIMESTAMPTZ (nullable, no default → metadata-only ALTER, no row rewrite) and a separate ALTER for SET DEFAULT now() (also metadata-only). No bulk UPDATE on the hot task_usage table. The rollup window function's dirty_keys CTE handles legacy NULL rows via an OR branch, supported by partial index idx_task_usage_created_at_legacy. 3. Refresh stale documentation in cmd/backfill_task_usage_daily/main.go header to describe the current recompute/replace semantics, idempotent re-runnability, and the actual migration numbering (072..077). Tests: - TestRollupTaskUsageDaily_InvalidationOnReassign: verifies usage moves between runtime buckets after ReassignTasksToRuntime-style update. - TestRollupTaskUsageDaily_InvalidationOnIssueDelete: verifies daily bucket is cleared after issue delete cascades through atq → task_usage. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: multica-agent <github@multica.ai>