/**
 * History Tracker Module
 * Manages migration history tracking in database
 */
import type { Client } from 'pg';
import type { IMigrationRecord } from '../../types/apply';
export declare class HistoryTracker {
    private readonly tableName;
    /**
     * Ensure the migration history table exists and is upgraded for migration_id + immutability.
     */
    ensureHistoryTable(client: Client): Promise<void>;
    private dropLegacyChecksumUnique;
    private createPartialUniqueIndex;
    private backfillMigrationIds;
    private extractMigrationIdFromPath;
    /**
     * Create indexes on migration history table
     */
    private createIndexes;
    /**
     * Decide whether to apply, skip, or fail (immutability violation).
     */
    getApplyDecision(client: Client, migrationId: string, checksum: string, enforceImmutability: boolean): Promise<'apply' | 'skip'>;
    /**
     * Record a migration in history
     */
    recordMigration(client: Client, record: Omit<IMigrationRecord, 'id'>): Promise<void>;
    /**
     * Get all applied migrations
     */
    getAppliedMigrations(client: Client): Promise<IMigrationRecord[]>;
    /**
     * Get migration status for a specific migration id
     */
    getMigrationStatus(client: Client, migrationId: string): Promise<IMigrationRecord | null>;
}
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