Optimize data population service

https://github.com/harshraj22/Dis-Sim/blob/f6e283c753a1b1188798a27c480704add5a166b0/src/data_population/populate.py#L26

Currently data population service creates a new connection to db each time a user registers. It needs to fetch the details to update the redis. Creating and destroying db connections is costly. Optimize this step, maybe using db triggers, or using connections that are able to read changes made in databases.