fix data base

bd/tables/poll.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, String, Boolean, DateTime, Text
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.sql import func
+from sqlalchemy.orm import relationship
+from .simple_base import Base
+import uuid
+
+
+class Poll(Base):
+    __tablename__ = "polls"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    title = Column(String(255), nullable=False)
+    description = Column(Text, nullable=True)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
+
+    questions = relationship("Question", backref="poll", cascade="all, delete-orphan", passive_deletes=True)
+
+
+__all__ = ["Base", "Poll"]