Is drizzle-kit supposed to include existings table in the migration file?

is drizzle-kit supposed to include an existing table in the migration file (the sql file)? For context, I’m using keycloak for authentication. The tables created by keycloak are on the same database as those created by my BE app. I want to query the keycloak tables using Drizzle so I use the introspect feature to generate the schema. I notice that when I generate migration file, the file includes the sql for the keycloak tables. I don’t think it’s supposed to do that because the keycloak tables have already been created (by keycloak). They already exist in the database, why would the migration file include the sql to create an already existing tables? Thanks