saveIfNotExistsAndGet
suspend fun saveIfNotExistsAndGet(entity: T, serialConsistency: KandraConsistency = KandraConsistency.LOCAL_SERIAL): T?
Same LWT write as saveIfNotExists, but returns the entity actually persisted — including any @GeneratedUuid/@CreatedAt/@UpdatedAt values generated for the write, which saveIfNotExists computes internally and then discards behind a bare Boolean. Returns null when the row already existed (the same case saveIfNotExists reports as false). See KandraRepository.saveIfNotExistsAndGet's doc (the blocking counterpart) — GH #138.