/**
 * `db/` domain — verification-focused database tools for the backend platform.
 *
 * Three engines supported via optional peer dependencies: `pg` (Postgres),
 * `mysql2` (MySQL/MariaDB), `better-sqlite3` (SQLite). Engines are loaded
 * only when actually used; missing peer deps surface as agent-readable
 * errors with the npm install command.
 *
 * Tool surface (14):
 *   - Connection lifecycle: connect / disconnect / list-connections
 *   - Schema discovery: list-tables / describe-table
 *   - Read path: query
 *   - State diffing: snapshot / diff
 *   - Streaming: watch-changes / get-changes
 *   - Transactions: transaction-begin / transaction-commit / transaction-rollback
 *   - Write path: seed (structured) / run-script (raw SQL)
 *
 * Readonly enforcement is defense-in-depth — see <readonly-guard.ts> for the
 * parser layer and the per-engine connection files for the server-side
 * READ ONLY mode that is the actual security boundary.
 */
import { Tool } from '../../../../tools';
import { BackendToolSessionContext } from '../context';
export declare const tools: Tool<BackendToolSessionContext>[];