Modello dati e contratto

Il contratto pubblico ruota intorno a prodotti, target, competitor product, osservazioni, alert e webhook.

Entity	Contract
Product	Host SKU, keyed by `external_id` per tenant.
MonitoringTarget	Product and country pair with frequency and options.
CompetitorProduct	Confirmed or reviewed URL attached to a target.
PriceObservation	Captured price in source currency and normalized cents.
Alert	Business signal derived from observations.
WebhookSubscription	Delivery endpoint, event filters, optional secret.

Tenant scope

Every business table is tenant-scoped. Jobs carry tenant_id and restore TenantContext before work.

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