Its called CECA which allows Indian "professionals" to work in Singapore lol
As I said, first stage of decline. Inevitably, such a large population will influence Singapore's politics and policies in the future
This is a long term process
I don't think Singapore will allow Indian nationals to hijack the country for their own interests. The local Singaporeans and the government will not allow that. Unlike the Rose-tinted Westerners, Singaporeans are far more aware of Indian shenanigans. Singaporeans have a better understanding of Indian culture, because of their exposure to the sizable Singaporean Indian community. There are cultural similarities, but the Jai Hinds of India readily 'out-Jai Hinds' any Singaporean Indian.
Most Singaporeans don't view Indians as innocent, oppressed, and democratic people that needs saving. They just view them as they are, Indians. The foreign Indian community can try to push around the government and society. But Singaporeans will be far more aware about that, then the liberals in the West. There is no fast-track to Singaporean citizenship. It is quite challenging to get one, and it is very competitive. That means that most Indians won't be able to get Singaporean citizenship. They may get Permanent Resident status, but that does not come with voting rights.
Singapore is not as naïve as the West. There is already a pushback on too many foreign expats coming into Singapore and occupying too many white-collar positions. Now there are quotas for foreign expats to come into Singapore. If Indians try to populate and hijack Singapore, I'm sure that there will be a pushback.