export interface LegacySessionRow {
    id: string;
    title: string;
    updatedAt: number;
    turns: number;
    agent?: string;
}
export interface LegacyTokenGroup {
    id: string;
    label: string;
    createdAt: number;
    lastUsedAt: number | null;
    sessions: LegacySessionRow[];
}
export interface LegacyUpgradePreview {
    pending: boolean;
    tokens: LegacyTokenGroup[];
    local: {
        sessions: LegacySessionRow[];
    };
}
export declare function markLegacyUpgradeDone(): void;
export declare function listLegacyUpgrade(): LegacyUpgradePreview;
export declare function allLegacyThreadIds(preview?: LegacyUpgradePreview): string[];
export declare function inheritLegacySession(userId: string, threadId: string): {
    inherited: string;
    discardedTokens: number;
    discardedSessions: number;
    messengers: number;
};
export declare function skipLegacyUpgrade(userId: string): {
    discardedTokens: number;
    discardedSessions: number;
    messengers: number;
};
/** First-admin hook: claim messengers only. Tokens wait for the inherit step. */
export declare function adoptLegacyInstall(userId: string): {
    tokens: number;
    messengers: number;
};
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