/**
 * Darwin — SQLite Memory Provider
 *
 * Persistent storage for experiments, prompt versions, learnings, and state.
 * Uses better-sqlite3 for synchronous, fast, single-file storage.
 *
 * Database location: {dataDir}/.darwin/darwin.db
 */
import type { DarwinConfig, DarwinExperiment, DarwinState, Learning, MemoryProvider, PromptVersion } from '../types.js';
export declare class SqliteMemoryProvider implements MemoryProvider {
    private db;
    private readonly dbPath;
    constructor(config: DarwinConfig);
    init(): Promise<void>;
    close(): Promise<void>;
    saveExperiment(exp: DarwinExperiment): Promise<void>;
    loadExperiments(agentName: string, limit?: number): Promise<DarwinExperiment[]>;
    savePromptVersion(pv: PromptVersion): Promise<void>;
    getActivePrompt(agentName: string): Promise<PromptVersion | null>;
    getAllPromptVersions(agentName: string): Promise<PromptVersion[]>;
    saveLearning(learning: Learning): Promise<void>;
    searchLearnings(query: string, limit?: number): Promise<Learning[]>;
    getState(): Promise<DarwinState>;
    saveState(state: DarwinState): Promise<void>;
    /**
     * Atomically read-modify-write the Darwin state inside a single transaction.
     * Prevents race conditions when multiple agents update state concurrently.
     * Uses BEGIN IMMEDIATE to acquire a write lock before reading.
     */
    updateState(fn: (state: DarwinState) => DarwinState): Promise<DarwinState>;
    /** Get the database connection, throw if not initialized */
    private getDb;
    /** Create all tables and indexes */
    private createTables;
}
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