t7.scala

// Re-useable effect descriptions
val sendEmail: IO[Unit] = IO(println("Sending email"))
val insertUser: ConnectionIO[Int] = 
  sql"INSERT INTO users(name, email) VALUES('Emily', '[email protected]')"
    .update.run

// (1)  BEGIN; INSERT; sendEmail(); COMMIT;
val insertThenSend: ConnectionIO[Unit] =
  insertUser.flatMap(_ => sendEmail.to[ConnectionIO])
  
val result1: IO[Unit] = insertThenSend.transact(transactor)