How to use record_class

[Pirulax]

So, maybe it's just me, but I can't find any documentation on how all this record_class thing works.
From what I understand I have to sub-class it:

class MyCustomRecord(asyncpg.Record):
  id : int
  is_special : bool

Should match records from a table like, right?

CREATE TABLE mytbl (
 id SERIAL PRIMARY KEY,
 is_special BOOL NOT NULL DEFAULT TRUE
)

Also, what if the record has extra keys? (Lets say the above table had an extra column "price")
Do the variable names have to match with the ones in the db?