old_contents: from app import db
  from models import Users, RepExercisesTaxonomy, RepExercisesHistory
  
  
  class UsersService(object):
      """
      Service class for interacting with the Users SQLAlchemy object
  
      I N T E R F A C E   G U A R A N T E E D
      ---------------------------------------
      get_user_with_email(email):
          -- Returns the Users with the email passed in. Returns None if no user exists with the given email
  
      add_user_to_database(email, nickname, hashed_password):
          -- Adds a user to the database
  
      user_with_email_already_exists(email):
          -- Returns True if a user with that email already exists. Otherwise returns False.
  
      get_list_of_all_users():
          -- Exports all Users as a list [Users(), ...]
      """
      @staticmethod
      def get_user_with_email(email):
          return db.session.query(Users).filter(Users.email == email).first()
  
      @staticmethod
      def add_user_to_database(email, nickname, hashed_password):
          new_user = Users(email=email, nickname=nickname, password=hashed_password)
          db.session.add(new_user)
          db.session.commit()
  
      @staticmethod
      def user_with_email_already_exists(email):
          users = Users.query.all()
          user_emails = [x.email for x in users]
          if email in user_emails:
              return True
          else:
              return False
  
      @staticmethod
      def get_list_of_all_users():
          return list(Users.query.all())
  
  
  class RepExercisesTaxonomyService(object):
      """
      Service class for interacting with the RepExercisesTaxonomy SQLAlchemy object
  
      I N T E R F A C E   G U A R A N T E E D
      ---------------------------------------
      get_list_of_all_exercises():
          -- Exports all RepExercisesTaxonomy entries as a list [RepExercisesTaxonomy(), ...]
      """
      @staticmethod
      def get_list_of_all_exercises():
          return list(RepExercisesTaxonomy.query.all())
  
  
  class RepExercisesHistoryService(object):
      """
      Service class for interacting with the RepExercisesHistory SQLAlchemy object
  
      I N T E R F A C E   G U A R A N T E E D
      ---------------------------------------
      get_list_of_all_history():
          -- Exports all RepExercisesHistory entries as a list [RepExercisesHistory(), ...]
      """
      @staticmethod
      def get_list_of_all_history():
          return list(RepExercisesHistory.query.all())
  
      @staticmethod
      def get_users_exercises(user_id):
          return list(db.session.query(RepExercisesHistory).filter_by(user_id=user_id).all())
  
new_contents: from app import db
  from models import Users, RepExercisesTaxonomy, RepExercisesHistory
  
  
  class UsersService(object):
      """
      Service class for interacting with the Users SQLAlchemy object
  
      I N T E R F A C E   G U A R A N T E E D
      ---------------------------------------
      get_user_with_email(email):
          -- Returns the Users with the email passed in. Returns None if no user exists with the given email
  
      add_user_to_database(email, nickname, hashed_password):
          -- Adds a user to the database
  
      user_with_email_already_exists(email):
          -- Returns True if a user with that email already exists. Otherwise returns False.
  
      get_list_of_all_users():
          -- Exports all Users as a list [Users(), ...]
      """
      @staticmethod
      def get_user_with_email(email):
          return db.session.query(Users).filter(Users.email == email).first()
  
      @staticmethod
      def add_user_to_database(email, nickname, hashed_password):
          new_user = Users(email=email, nickname=nickname, password=hashed_password)
          db.session.add(new_user)
          db.session.commit()
  
      @staticmethod
      def user_with_email_already_exists(email):
          users = Users.query.all()
          user_emails = [x.email for x in users]
          if email in user_emails:
              return True
          else:
              return False
  
      @staticmethod
      def get_list_of_all_users():
          return list(Users.query.all())
  
  
  class RepExercisesTaxonomyService(object):
      """
      Service class for interacting with the RepExercisesTaxonomy SQLAlchemy object
  
      I N T E R F A C E   G U A R A N T E E D
      ---------------------------------------
      get_list_of_all_exercises():
          -- Exports all RepExercisesTaxonomy entries as a list [RepExercisesTaxonomy(), ...]
      """
      @staticmethod
      def get_list_of_all_exercises():
          return list(RepExercisesTaxonomy.query.all())
  
  
  class RepExercisesHistoryService(object):
      """
      Service class for interacting with the RepExercisesHistory SQLAlchemy object
  
      I N T E R F A C E   G U A R A N T E E D
      ---------------------------------------
      get_list_of_all_history():
          -- Exports all RepExercisesHistory entries as a list [RepExercisesHistory(), ...]
  
      get_users_exercises():
          -- Exports all RepExercisesHistory entries of a particular user [RepExercisesHistory(), ...]
      """
      @staticmethod
      def get_list_of_all_history():
          return list(RepExercisesHistory.query.all())
  
      @staticmethod
      def get_users_exercises(user_id):
          return list(db.session.query(RepExercisesHistory).filter_by(user_id=user_id).all())
  
subject: Update interface docstring