/**
 * Base Database Adapter Interface
 * All adapters must implement these methods
 */
import type { Statement, RunResult } from './statement.js';
export type { Statement, RunResult };
export interface VectorSearchResult {
    rowid: number;
    similarity?: number;
    distance?: number;
}
export declare abstract class DatabaseAdapter {
    /**
     * Connect to database
     * @returns Database connection
     */
    abstract connect(): unknown;
    /**
     * Disconnect from database
     */
    abstract disconnect(): void;
    /**
     * Check if connected
     * @returns Connection status
     */
    abstract isConnected(): boolean;
    /**
     * Prepare a SQL statement
     * @param sql - SQL query
     * @returns Prepared statement
     */
    abstract prepare(sql: string): Statement;
    /**
     * Execute raw SQL
     * @param sql - SQL to execute
     */
    abstract exec(sql: string): void;
    /**
     * Execute function in transaction
     * @param fn - Function to execute
     * @returns Function return value
     */
    abstract transaction<T>(fn: () => T): T;
    /**
     * Vector similarity search
     * @param embedding - Query embedding (1024-dim)
     * @param limit - Max results
     * @returns Search results with distance
     */
    abstract vectorSearch(embedding: Float32Array | number[], limit: number, topicPrefix?: string): VectorSearchResult[] | null;
    /**
     * Insert vector embedding
     * @param rowid - Decision rowid
     * @param embedding - Embedding vector
     */
    abstract insertEmbedding(rowid: number, embedding: Float32Array | number[]): RunResult | null;
    /**
     * Get last inserted row ID
     * @returns Last rowid
     */
    abstract getLastInsertRowid(): number;
    /**
     * Run migrations
     * @param migrationsDir - Path to migrations directory
     */
    abstract runMigrations(migrationsDir: string): void;
    /**
     * Check if vector search is enabled
     */
    abstract get vectorSearchEnabled(): boolean;
    /**
     * Get database path
     */
    abstract getDbPath(): string;
}
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