/**
 * The provisioned expansion tracker and its trial clock. One row per expansion, written when CS
 * activates the device. Every scheduled sweep reads only this table.
 *
 * Trial lengths differ by arm, and `free_loaner`'s is the non-obvious one:
 * - `free_subscription` — `trial_end = activation + 6 months`.
 * - `free_loaner` — `trial_end = shipped + 75 days`, not 60. The offer is advertised as 60 days with
 *   a 15-day return grace, and Notion US-04 is explicit that no charge applies until day 75, which
 *   is also what the confirmation checkbox authorises. Setting the trial to the full 75 makes a
 *   return a cancel-*during*-trial instead of a bill-then-refund, and means the subscription starts
 *   on time without anyone having to act.
 *
 * So for a loaner `graceEndsAt === trialEndAt` by construction. Both are kept: the sweeps read
 * `graceEndsAt`, Stripe owns `trialEndAt`, and a divergence between them is a bug worth catching.
 *
 * At day 75 two things happen with different actors — Stripe converts the subscription by itself,
 * while the one-time hardware fee is an explicit call somebody has to make from the CS queue
 * (`billingCampaignExpansionOrder.deviceFeeChargedAt`). Only the second one can be forgotten.
 */
export declare class BillingCampaignExpansionDevice {
    id: number;
    /** FK to `billingCampaignExpansion.id`. */
    expansionId: number;
    /** The expansion tracker itself. Unknown until CS activates — see `qualifyingImei` for the other one. */
    imei: string | null;
    subscriptionId: string | null;
    subscriptionCreatedAt: Date | null;
    trialStartAt: Date | null;
    trialEndAt: Date | null;
    /** Trial flipped to active and the subscription started billing. */
    convertedAt: Date | null;
    canceledAt: Date | null;
    activatedAt: Date | null;
    /**
     * `free_subscription` only — delivery + 30 days. The device has to report by then or the offer
     * expires and the trial subscription is cancelled.
     */
    activationDeadlineAt: Date | null;
    firstPingAt: Date | null;
    lastPingCheckedAt: Date | null;
    pingDetected: boolean;
    /** `free_loaner` — shipped + 60 days. The advertised trial end; nothing bills here. */
    returnDueAt: Date | null;
    /** `free_loaner` — shipped + 75 days. Equals `trialEndAt`; see the class comment. */
    graceEndsAt: Date | null;
    /** Always a CS stamp — no system of ours observes a physical return. */
    returnedAt: Date | null;
    /** Set when day 75 passes with no return stamped and no fee charged. Surfaced in the CS queue. */
    returnNeedsManualVerification: boolean;
    /** `free_loaner` day 50 — keep/return reminder. */
    reminderD50SentAt: Date | null;
    /** Informational heads-up before billing starts. No opt-out prompt on either arm. */
    preBillingFyiSentAt: Date | null;
    csReminderSentAt: Date | null;
    csReminderCount: number;
    createdAt: Date | null;
    updatedAt: Date | null;
}