/** Learned-teammate entries older than this (by lastSeenAt) are ignored by
 *  isTeamBot / listTeamBots — the bot hasn't shown up in a team context for a
 *  month, so we stop vouching for it until it's seen again. */
export declare const DEFAULT_EXPIRY_MS: number;
export interface TeamBot {
    unionId: string;
    name: string;
    firstSeenAt: number;
    lastSeenAt: number;
}
/**
 * Upsert a learned teammate bot by union_id. Existing entry keeps firstSeenAt
 * and bumps lastSeenAt (+ refreshes name); new entry stamps both.
 *
 * No-op when unionId is empty — many inbound bot events DO carry
 * `sender.sender_id.union_id`, but the ones that don't simply can't be learned
 * (and fall back to the existing /grant path), never polluting the store with a
 * keyless entry. name may be empty (we still record the trusted union_id).
 *
 * Returns true iff the store changed (new entry or refreshed timestamp/name),
 * so callers can skip a redundant log.
 */
export declare function recordTeamBot(dataDir: string, bot: {
    unionId: string | undefined;
    name?: string;
}, now?: number): boolean;
/** Is `unionId` a known (non-expired) teammate bot? The auth gate's predicate.
 *  Empty/unknown/expired → false (caller falls back to /grant). */
export declare function isTeamBot(dataDir: string, unionId: string | undefined, maxAgeMs?: number, now?: number): boolean;
/** All non-expired learned teammate bots (for discovery / debugging). Unordered. */
export declare function listTeamBots(dataDir: string, maxAgeMs?: number, now?: number): TeamBot[];
/** Forget a learned teammate (explicit revoke). Returns true if removed. */
export declare function removeTeamBot(dataDir: string, unionId: string | undefined): boolean;
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