/**
 * SqliteMemoryBackend — better-sqlite3 backed memory storage.
 *
 * Lives in src/store/ alongside SqliteSlopeStore. Uses the same
 * `.slope/slope.db` file but a dedicated `memories` table (added in
 * migration v8). Keeps the API sync via better-sqlite3 prepared statements.
 *
 * Migration: on first open, if a sibling `.slope/memories.json` exists and
 * the memories table is empty, contents are imported and the JSON file is
 * renamed to `.slope/memories.json.bak` so the original is preserved as a
 * one-time backup.
 */
import type { MemoryBackend } from '../core/memory-backend.js';
import type { Memory, MemoriesFile } from '../core/memory-types.js';
export declare class SqliteMemoryBackend implements MemoryBackend {
    readonly kind: "sqlite";
    private db;
    private cwd;
    /** True after the importJsonIfPresent() pass has run for this instance. */
    private importedJson;
    constructor(cwd: string, dbPath: string);
    /**
     * Idempotent: create the memories table if it doesn't exist. Independent
     * of the SqliteSlopeStore migration system so the backend can be used
     * standalone (tests, embedded use). The full migration is owned by
     * SqliteSlopeStore (v8).
     */
    private ensureSchema;
    /** One-time migration from .slope/memories.json. Runs at most once per
     *  backend instance and only if the table is currently empty. */
    private importJsonIfPresent;
    private renameJsonBackup;
    private prepareInsert;
    load(): MemoriesFile;
    saveAll(data: MemoriesFile): void;
    add(memory: Memory): void;
    remove(id: string): boolean;
    update(id: string, fields: Partial<Pick<Memory, 'text' | 'category' | 'weight' | 'updatedAt'>>): Memory | null;
    getById(id: string): Memory | undefined;
    /** Close the underlying connection. Test/teardown helper. */
    close(): void;
}
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