import type { ClientSession, Db } from 'mongodb';
import type { Logger } from '@nl-framework/logger';
export interface MigrationContext {
    db: Db;
    /** Present when the migration runs inside a transaction (replica-set topology). */
    session?: ClientSession;
    logger: Logger;
}
/** A single, reversible schema/data migration. */
export interface Migration {
    name: string;
    up(context: MigrationContext): Promise<void>;
    down(context: MigrationContext): Promise<void>;
    /** Optional explicit checksum; when omitted it is derived from `up`/`down` source. */
    checksum?: string;
}
/** A row in the `_nl_migrations` history collection. */
export interface MigrationRecord {
    name: string;
    appliedAt: Date;
    durationMs: number;
    checksum: string;
}
export interface MigrationStatusEntry {
    name: string;
    applied: boolean;
    appliedAt?: Date;
    /** True when the file's checksum no longer matches the applied record. */
    checksumChanged: boolean;
}
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