/**
 * Pluggable storage backend interface.
 * Both sql.js (WASM) and better-sqlite3 (native) implement this.
 * All queries — including recursive CTEs — work identically on both.
 */
export interface RunResult {
    changes: number;
    lastInsertRowid: number;
}
export interface StorageBackend {
    /** Execute a mutating SQL statement (CREATE, INSERT, UPDATE, DELETE). */
    run(sql: string, params?: unknown[]): RunResult;
    /** Query multiple rows. */
    all<T = Record<string, unknown>>(sql: string, params?: unknown[]): T[];
    /** Query a single row. */
    get<T = Record<string, unknown>>(sql: string, params?: unknown[]): T | undefined;
    /** Wrap multiple operations in a transaction. */
    transaction<R>(fn: () => R): R;
    /** Execute raw SQL (for schema setup, multiple statements). */
    exec(sql: string): void;
    /** Serialize DB to a buffer (sql.js → file persistence). Returns null for native backend. */
    serialize(): Buffer | null;
    /** Close the connection. */
    close(): void;
}
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