from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, DateTime, func, String
import uuid

Base = declarative_base()


class BaseModel(Base):
    """Базовая модель с общими полями"""
    __abstract__ = True
    
    id = Column(
        String,
        primary_key=True,
        default=lambda: str(uuid.uuid4()),
        nullable=False
    )
    created_at = Column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False
    )
    updated_at = Column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False
    )