Nuevos cambios en el backend

backend/app/models/exam.py

@@ -39,6 +39,12 @@ class ExamTemplate(Base):
     __tablename__ = "exam_templates"
 
     id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    user_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("users.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
+    )
     title: Mapped[str] = mapped_column(String(200), nullable=False)
     subject: Mapped[str] = mapped_column(String(200), nullable=False)
     educational_level: Mapped[str] = mapped_column(String(120), nullable=False)
@@ -48,6 +54,8 @@ class ExamTemplate(Base):
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
     updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
 
+    owner: Mapped["User"] = relationship(back_populates="exam_templates")
+
     questions: Mapped[list["Question"]] = relationship(
         back_populates="template",
         cascade="all, delete-orphan",