text: import datetime
  
  from database.database_schemas import Schemas
  from sqlalchemy import Column, Integer, String, DateTime
  
  from database.base import Base
  
  
  class Mosaics(Base):
      """Maps to mosaics table in chemprop databases."""
  
      __tablename__ = 'mosaics'
      __table_args__ = {'schema': Schemas.qsar_schema}
  
      id = Column(Integer, primary_key=True, nullable=False)
      filename = Column(String)
      file_url = Column(String)
      file_kilobytes = Column(Integer)
      file_record_count = Column(Integer)
      added_by_user_id = Column(Integer)
      user_id = Column(Integer)
      file_app_name = Column(String)
      inserts = Column(Integer)
      deletes = Column(Integer)
      updates = Column(Integer)
      processing = Column(Integer, default=1)
      is_valid = Column(Integer)
      bottle_count = Column(Integer)
      created_at = Column(DateTime, default=datetime.datetime.now, nullable=False)
      updated_at = Column(DateTime, default=datetime.datetime.now, nullable=False)