text: from app import db
  from app.utils import get_current_timestamp_CST
  
  
  class TimestampMixin():
      created = db.Column(
          db.DateTime, nullable=False, default=get_current_timestamp_CST())
      updated = db.Column(db.DateTime, onupdate=get_current_timestamp_CST())
  
  
  class SoftDeleteMixin():
      is_deleted = db.Column(db.Boolean, default=False)