import uuid
from datetime import datetime
from sqlalchemy import Column, DateTime
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import declarative_base

Base = declarative_base()

class BaseDBModel(Base):
    __abstract__ = True
    
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, index=True, nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False, index=True)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)