/**
 * PlayerSession entity data for creation
 */
export interface PlayerSessionProps {
    /** Row id once persisted; undefined for a session not yet saved. */
    id?: number;
    serverName: string;
    playerName: string;
    joinedAt: Date;
    /** null while the player is still connected. */
    leftAt: Date | null;
}
/**
 * Plain-serializable representation of a PlayerSession.
 */
export interface PlayerSessionJson {
    id?: number;
    serverName: string;
    playerName: string;
    joinedAt: string;
    leftAt: string | null;
}
/**
 * PlayerSession entity
 * A single join→leave connection window for a player on a server, derived
 * from parsed server log lines (#528, Phase 4). An open session (`leftAt ===
 * null`) counts as ongoing up to whatever `now` is passed to
 * `durationSeconds`.
 */
export declare class PlayerSession {
    private readonly _id?;
    private readonly _serverName;
    private readonly _playerName;
    private readonly _joinedAt;
    private readonly _leftAt;
    private constructor();
    get id(): number | undefined;
    get serverName(): string;
    get playerName(): string;
    get joinedAt(): Date;
    get leftAt(): Date | null;
    /** Session length in seconds; an open session (`leftAt === null`) counts up to `now`. */
    durationSeconds(now: Date): number;
    static create(data: PlayerSessionProps): PlayerSession;
    toJSON(): PlayerSessionJson;
}
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