import type { DatabaseSync } from 'node:sqlite';
import type { ChatSyncCommand } from './chat-message-sync.js';
/** Shares the timeline database and transaction boundary; runs only in its Worker. */
export declare class ChatMessageSyncStore {
    private readonly db;
    private readonly reserve;
    private readonly enforceBudget;
    private readonly statements;
    private prepare;
    constructor(db: DatabaseSync, reserve: () => number, enforceBudget: () => void);
    private initializeBudget;
    private get;
    private assert;
    private status;
    command(command: ChatSyncCommand): unknown;
    private applySession;
    retire(scope: string, eventId?: string): void;
    invalidate(scope: string, itemKey?: string): void;
    private read;
}
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