Persisting a LocalDateTime as a Timestamp with `Timestamp.valueOf(LocalDateTime)`
and retrieving it with `ResultSet#getObject(index, LocalDateTime.class)` seems
to result in a data loss at the millisecond fraction level.
This commit changes the usage of `ResultSet#getObject(index, LocalDateTime.class)`
to `ResultSet#getTimestamp(index).toLocalDateTime()`.
A round trip to the database with `Timestamp.valueOf(LocalDateTime)` and
`Timestamp.toLocalDateTime()` should not result in a data loss.
5c92623785