Hi, The documentation for hibernate.id.optimizer.pooled.preferred says the following: hilo; legacy-hilo Define a custom algorithm for generating pools of values based on a single value from a table or sequence. These optimizers are not recommended for use. They are maintained (and mentioned) here simply for use by legacy applications that used these strategies previously. Will these settings be supported long-term, or are there plans to deprecate/remove them? Thanks, Gail