Deleting a key from DB and writing it again in the same transaction does not work

[Remco]

Imagine key X is stored in the database. If we start a new transaction in which we will delete X, and later in the same transaction write X to the database again. The key will not be stored in the database.

@Test
public void shouldWriteKeyAfterDeletion() {
    // given
    oneKey.wrapLong(1);
    oneValue.wrapLong(-1);
    oneColumnFamily.put(oneKey, oneValue);

    // when
    assertThat(oneColumnFamily.get(oneKey).getValue()).isEqualTo(-1);
    transactionContext.runInTransaction(
        () -> {
          oneColumnFamily.delete(oneKey);
          oneValue.wrapLong(-2);
          oneColumnFamily.put(oneKey, oneValue);
        });

    // then
    assertThat(oneColumnFamily.exists(oneKey)).isTrue();
    assertThat(oneColumnFamily.get(oneKey).getValue()).isEqualTo(-2);
  }

The reason for this is that on commit of a transaction it will first process all the writes. After this it will process all the deletes. Therefore the order of the statements in the transactions is lost.

override fun commit() {
        inCurrentTransaction = false
        database.putAll(transactionCache)
        deletedKeys.forEach { database.remove(it) }
        deletedKeys.clear()
        transactionCache.clear()
    }