user = SystemUser.new(email: "marcos@example.com", password: "marcos123")
user.profile = Profile.new(first_name: "Marcos")
user.save

(0.1ms)  begin transaction
  SystemUser Exists (2.7ms)  SELECT  1 AS one FROM "system_users" WHERE "system_users"."email" = ? LIMIT ?  [["email", "marcos@example.com"], ["LIMIT", 1]]
  SQL (7.1ms)  INSERT INTO "system_users" ("email", "encrypted_password", "created_at", "updated_at") VALUES (?, ?, ?, ?)  [["email", "marcos@example.com"], ["encrypted_password", "$2a$11$Wl8mzOtFlD9RRCdAr38Ze.vYdrbrPRHkIEqutAsAyodQSDzihy35O"], ["created_at", "2017-11-12 23:27:23.270956"], ["updated_at", "2017-11-12 23:27:23.270956"]]
   (0.1ms)  begin transaction
  SQL (5188.0ms)  INSERT INTO "profiles" ("first_name", "created_at", "updated_at", "system_user_id") VALUES (?, ?, ?, ?)  [["first_name", "Marcos"], ["created_at", "2017-11-12 23:27:23.281227"], ["updated_at", "2017-11-12 23:27:23.281227"], ["system_user_id", 1]]
   (0.1ms)  rollback transaction
   (6.2ms)  rollback transaction
ActiveRecord::StatementInvalid: SQLite3::BusyException: database is locked: INSERT INTO "profiles" ("first_name", "created_at", "updated_at", "system_user_id") VALUES (?, ?, ?, ?)
        from (irb):3