Another way I've seen done to preserve uniqueness where order leakage doesn't matter is prefixing IDs uniquely per table. Something like uid147... for user IDs

Another way I've seen done to preserve uniqueness where order leakage doesn't matter is prefixing IDs uniquely per table. Something like uid147... for user IDs pid12... for post ID... It is certainly helpful when debugging and isn't hard to write a test to verify prefixes aren't duplicated across tables.