old_contents: from datetime import datetime
  from peewee import ForeignKeyField, CompositeKey, DateTimeField
  from models.base_model import BaseModel
  from models.user_model import UserModel
  from models.waifu_model import WaifuModel
  
  
  class UserToWaifuModel(BaseModel):
      class Meta:
          db_table = 'users_to_waifus'
          primary_key = CompositeKey('user', 'waifu')
  
      user = ForeignKeyField(UserModel)
      waifu = ForeignKeyField(WaifuModel)
      created_at = DateTimeField(null=False, default=datetime.now)
  
new_contents: from datetime import datetime
  from peewee import ForeignKeyField, CompositeKey, DateTimeField
  from models.base_model import BaseModel
  from models.user_model import UserModel
  from models.waifu_model import WaifuModel
  
  
  class UserToWaifuModel(BaseModel):
      class Meta:
          db_table = 'users_to_waifus'
          primary_key = CompositeKey('user', 'waifu')
  
      user = ForeignKeyField(UserModel, related_name='waifus')
      waifu = ForeignKeyField(WaifuModel, related_name='users')
      created_at = DateTimeField(null=False, default=datetime.now)
  
subject: Fix related names.