# Issue

**Title:** JSON export fails with PydanticSerializationUnexpectedValue for reclassified transactions

## Description
When transactions are reclassified, the `TransactionType` field incorrectly stores a string representation of the enum rather than the enum object itself. This leads to a `PydanticSerializationUnexpectedValue` error when attempting to export data to JSON, particularly for merged descriptions. The expected behavior is for the `TransactionType` field to consistently hold the correct enum value, allowing JSON export to complete successfully without errors after reclassification.

## Task

Modify the repository so that the issue described above is resolved. The task's test suite verifies your patch by applying it on top of the base commit `96ce8cdb5561` and running the modified tests.