#3 managed_dns_records ledger (migration 026) — the single source of truth for
records ServerKit created in a connected provider zone, written by every write
path (zones page, DDNS, WordPress auto-DNS, email).
#4 DnsOwnershipService.guarded_upsert/guarded_delete: automatic paths refuse to
overwrite or delete a record ServerKit didn't create (the user's own records),
while the explicit Zones page adopts a matching record and takes ownership.
Wired into both CF paths (DNSZoneService._cloudflare_sync and
DNSProviderService._cloudflare_set_record/_delete_record). ensure_a_record now
surfaces a 'foreign_record' reason instead of clobbering.
#5 Live zone mirror: CloudflareClient.list_records +
DNSZoneService.list_provider_records classify every live record as serverkit vs
external; GET /api/v1/dns/<id>/mirror.
Tests: test_dns_ownership.py. Existing set_record mocks updated for the new
source kwarg.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
