feat: Compact 1-page print view, event lifecycle & conflict warnings, bulk email invites, guest pass link and post-event guest cleanup

app/models.py

@@ -35,7 +35,7 @@ class User(Base):
     created_at = Column(DateTime, default=func.now())
 
     tenant = relationship("Tenant", back_populates="users")
-    orders = relationship("Order", back_populates="user", cascade="all, delete-orphan")
+    orders = relationship("Order", back_populates="user")
 
 
 class Invitation(Base):
@@ -93,7 +93,8 @@ class Order(Base):
     id = Column(Integer, primary_key=True, index=True)
     tenant_id = Column(Integer, ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False)
     event_id = Column(Integer, ForeignKey("events.id", ondelete="CASCADE"), nullable=False)
-    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
+    guest_display_name = Column(String(150), nullable=True)
     total_price = Column(Numeric(10, 2), nullable=False, default=0.00)
     is_paid = Column(Boolean, default=False)
     created_at = Column(DateTime, default=func.now())
@@ -103,6 +104,12 @@ class Order(Base):
     user = relationship("User", back_populates="orders")
     items = relationship("OrderItem", back_populates="order", cascade="all, delete-orphan")
 
+    @property
+    def display_name(self) -> str:
+        if self.user:
+            return f"{self.user.first_name} {self.user.last_name}"
+        return self.guest_display_name or "Gast"
+
 
 class OrderItem(Base):
     __tablename__ = "order_items"