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Wire the id-preserving mappers into a runnable, idempotent, reversible migration: - backfill_onboarded_targets(db, dry_run): repositories -> onboarded_targets; dast_targets fold into the linked repo target (append LiveUrl, promote type, relink dast_scan_runs/pentest_sessions history) or migrate standalone. Skips existing (by _id), writes a schema_migrations marker; dry-run computes the report without writing. Legacy collections are never deleted. - revert(db): replay the relink log, drop onboarded_targets + the log, clear the marker — restores the pre-migration state. - CLI: `compliance-agent migrate onboarding [--all | --tenant <id>] [--dry-run] [--revert]`, with DatabasePool::list_tenant_ids for --all. - database.rs: collection_named<T> accessor + list_tenant_ids helper. Integration test (real Mongo, local-only — CI is --lib) covers fold + relink + idempotency + revert end to end. 5 mapper unit tests run in CI. Closes #132. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>