How could I predefine my schemas in the parse server cloud side?

[cbaker6]

You can create standard indexes or unique indexes by accessing the adapter directly. I show code for how to do this here:

Automatic DB indexes when Postgresql used as DB backend

You can do this after initializing your your Parse Server by accessing your adapter. This example works on both Postgres and Mongo:

There are other types of indexes you are not able to create as @Moumouls pointed out, for those, I typically run a script to add them to the DB directly.