How to add to the database where the table has a many relationship to another table

I have a users table, which has a many relationship to to a posts table.

I want to add a new user to the table, which I can do, but how do I go about adding new posts to that user? Does it add a full post object to the user? Or just an id to the new post which will be in the post table?

export const users = pgTable('users', { id: uuid('id').primaryKey().defaultRandom().unique().notNull(), username: varchar('username', { length: 512 }).unique().notNull(), }); export const usersRelations = relations(users, ({ many }) => ({ posts: many(posts), }));
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