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coexistence-connection-and-devices-ux, Increment 1 (design.md D1, tasks.md 1.1): purely additive, read-time-computed field used by front/dashboard to group Meta + QR devices sharing the same number into one card (groupDevicesByNumber). Reuses the SAME PhoneNumberNormalizer the backend already uses at write time (DeviceController) — never a second, drifting implementation. null when number is empty/null (device not yet connected).

meta-number-health-status, Increment 2 (design.md D4/D5/D6): null for any non-Meta device, WITHOUT exception. NEVER triggers a Meta call — reads only the eager-loaded healthStatus relation (see DeviceController::index()) via DeviceHealthSummaryBuilder, the single source of truth for this shape (also reused by the Increment 4 detail endpoint).

Bolsa unica de numeros (whatsapp-preverified-number-assignment, Inc 9, D15/D29): aditivo. Identidad persistente del numero (sobrevive a la desconexion) y el ultimo numero para mostrar cuando number esta vacio. Las columnas estan en Device::$hidden; aca se exponen explicitamente.

Identidad confirmada = clave + number_key_confirmed_at (una clave sin fecha es la "esperada" de una fila hermana todavia sin conectar).

Inc 10 (D29): free / reserved / pending / held, computed only from the row's columns (no event probe, no extra query). A torn-down row without key from before the backfill may look free (see DeviceSlotService::slotState()).

Inc 25 (audit 2026-10-15, D29/D36/D41/D42): suspension by the plan, the customer's keep choice, and whether a QR connection of this number is allowed (computed over the titular's rows already loaded by the listing; a single resource reads its number's rows with one query).

D60 (contract with front/dashboard): a QR row of the titular with a confirmed number identity may change to Meta in place (PUT devices/{id} with the Embedded Signup code of the same number, own SIM). Never an extra query.

armar-funnelchat-f1-f2 (contract 1014 C4, design.md D3): what the public API can do with this number, per provider. Additive; shared by the web routes and the /api/v1 alias.