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- task domain model + exhaustive §4.4 status machine tests (single source of truth) - per-customer polling workers reconciled every 30s from the customers collection; panic-safe runs; manual sync-now trigger; status provider for the admin panel - §5.3 upsert keyed on (system, key, customerId): refreshes content while status=imported, records upstream_changed timeline + notification after - attachments cached into GridFS via connector-authorized downloads - orphaned tickets flagged with timeline + consultant notification, never deleted; idempotent across polls - consultant identity from users.extra.ticketingIdentities per system - notifications store (insert/list/unread-count/mark-read) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>