Add soft delete API for signups

webapp/models.py

@@ -125,7 +125,7 @@ class SignupForm(models.Model):
 
 class Signup(models.Model):
     """
-    In
+    Actual signup into any SignupForm. Deletes are soft.
     """
 
     class Meta:
@@ -140,6 +140,7 @@ class Signup(models.Model):
     email = models.EmailField(blank=True, null=True)
     # Random unique identifier. Used for signup editing by the user.
     uuid = models.UUIDField(default=uuid4, editable=False)
+    deleted = models.BooleanField(default=False)
 
     def __str__(self):
         return f"{self.signupForm}: {self.list_name} ({self.pk})"
@@ -147,7 +148,6 @@ class Signup(models.Model):
 
 @receiver(post_save, sender=Signup)
 def email_on_signup(sender, instance, created, **kwargs):
-    """Send email validation."""
     if created and instance.email:
         # TODO: Possible bug due to many-to-many relationship with events and forms.
         # TODO: Subject field crashes with lazy loaded translations.