Add missing tx.Rollback in case of errors

[majst01]

According to: https://go.dev/doc/database/execute-transactions

Defer the transaction’s rollback. If the transaction succeeds, it will be committed before the function exits, making the deferred rollback call a no-op. If the transaction fails it won’t be committed, meaning that the rollback will be called as the function exits.

With this we can ensure we do not leak transactions which will eventually leak memory