add exports

src/index.ts

 import db from './lib/db.js';
 import { AuditRecord,AuditEngine,FS_ERROR } from './interfaces/index.js';
-import {FileEngine} from './engines/index.js';
+import { FileEngine, PostgreSqlEngine } from './engines/index.js';
 
 /**
  * @description Use this on your app to generate and log the audit record
@@ -41,5 +41,5 @@ export const generateAuditRecord = (auditInit?: AuditRecord | undefined, dbEngin
 }
 
 export default generateAuditRecord;
-export {FileEngine} from './engines/index.js';
-export { AuditRecord };
+export { FileEngine, PostgreSqlEngine };
+export { AuditRecord, AuditEngine ,FS_ERROR };