@Override
    public void releaseSavepoint(Handle handle, String savepointName) {
        nonspecial(handle).releaseSavepoint(handle, savepointName);
    }
This <code>TransactionHandler</code> uses local JDBC transactions
demarcated explicitly on the handle and passed through to be handled
directly on the JDBC Connection instance.
core/src/main/java/org/jdbi/v3/core/transaction/LocalTransactionHandler.java