import type { DatabaseSync } from "node:sqlite";
import type { Context } from "@/types";
import type { DelayedSignalDbRecord } from "./databaseTypes.js";
/**
 * Delayed signals repository backed by SQLite with write-through caching.
 * Expects: schema migrations already applied for signals_delayed.
 */
export declare class DelayedSignalsRepository {
    private readonly db;
    private readonly signalsById;
    private readonly signalLocks;
    private readonly cacheLock;
    private readonly createLock;
    private allSignalsLoaded;
    constructor(db: DatabaseSync);
    create(record: DelayedSignalDbRecord): Promise<void>;
    findById(id: string): Promise<DelayedSignalDbRecord | null>;
    findDue(now: number): Promise<DelayedSignalDbRecord[]>;
    findMany(ctx: Context): Promise<DelayedSignalDbRecord[]>;
    findAll(): Promise<DelayedSignalDbRecord[]>;
    delete(id: string): Promise<boolean>;
    deleteByRepeatKey(ctx: Context, type: string, repeatKey: string): Promise<number>;
    private signalCacheSet;
    private signalLoadById;
    private signalParse;
    private signalLockForId;
}
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