system-prompts-and-models-of-ai-tools/salesflow-saas/backend/app/models/base.py

import uuid
from datetime import datetime, timezone
from sqlalchemy import Column, DateTime, ForeignKey, String
from sqlalchemy.orm import declared_attr
from app.database import Base
from app.models.compat import UUID, default_uuid


class BaseModel(Base):
    __abstract__ = True

    id = Column(UUID(as_uuid=True), primary_key=True, default=default_uuid)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
    updated_at = Column(DateTime(timezone=True),
                        default=lambda: datetime.now(timezone.utc),
                        onupdate=lambda: datetime.now(timezone.utc))


class TenantModel(BaseModel):
    __abstract__ = True

    @declared_attr
    def tenant_id(cls):
        return Column(UUID(as_uuid=True), ForeignKey("tenants.id"), nullable=False, index=True)