Unique, monotonic sequence in NoSQL using SELECT FOR UPDATE style lock

Bharath was the son of king Dushmantya and legendary Shakuntala. Bharath conquered the land and became its emperor. The land would be known after his name: BharathVarsha.

Family Tree of Kuru Clan

Several generations after Bharath, Hasti ascended to the throne. Hasti founded the capital city of Hastinapur. Four generations after Hasti, Kuru became the emperor.
Kuru was the mightiest of Bharath's clan. He mediated regularly on the banks of Saraswati river. His meditation site became known as Kurukshetra. Kurukshetra would later be the battleground of the greatest war among his own clan.
Prateep became the emperor after seven generations from Kuru.