Amy-Jane Davies is one of 687,958 waiting for any type of NHS treatment in Wales.
The government said medical data of 500,000 people was affected but no personally identifiable information had been made available.
The improvement in government finances is unlikely to last, analysts say, with the impact of the Iran way yet to hit.
The arrest was made as part of a wider investigation into leadership at the Countess of Chester Hospital.
The Serious Fraud Office raided homes and businesses over alleged conspiracy to defraud public money.
Hundreds of thousands of firms could potentially win back some money after the tariffs were struck down.
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