import type { Db } from '../storage/database.js';
import type { EventBus } from './events.js';
import type { StateEntry } from '../types.js';
export declare class StateService {
    private readonly db;
    private readonly events;
    constructor(db: Db, events: EventBus);
    set(namespace: string, key: string, value: string, updatedBy: string, ttlSeconds?: number): StateEntry;
    get(namespace: string, key: string): StateEntry | null;
    /** Lazy-delete expired entries. Cheap: hits the partial index on expires_at.
     * Wrap expires_at in datetime() so it works for BOTH the SQLite native format
     * (used when entries are created via raw SQL) AND the ISO format with 'T' and
     * 'Z' (used when entries are created via state.set() from JS). Without the
     * datetime() wrap, ISO-format entries never expire because string comparison
     * against "datetime('now')" fails ('T' > ' '). */
    private expireSweep;
    list(namespace?: string, prefix?: string): StateEntry[];
    namespaces(): string[];
    delete(namespace: string, key: string): boolean;
    deleteNamespace(namespace: string): number;
    compareAndSwap(namespace: string, key: string, expected: string | null, newValue: string, updatedBy: string, ttlSeconds?: number): boolean;
    private validateKey;
}
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