remove service letter contact model

app/models.py

@@ -512,10 +512,6 @@ class Service(db.Model, Versioned):
         default_reply_to = [x for x in self.reply_to_email_addresses if x.is_default]
         return default_reply_to[0].email_address if default_reply_to else None
 
-    def get_default_letter_contact(self):
-        default_letter_contact = [x for x in self.letter_contacts if x.is_default]
-        return default_letter_contact[0].contact_block if default_letter_contact else None
-
     def has_permission(self, permission):
         return permission in [p.permission for p in self.permissions]
 
@@ -916,34 +912,20 @@ class TemplateBase(db.Model):
 
     redact_personalisation = association_proxy('template_redacted', 'redact_personalisation')
 
-    @declared_attr
-    def service_letter_contact_id(cls):
-        return db.Column(UUID(as_uuid=True), db.ForeignKey('service_letter_contacts.id'), nullable=True)
-
-    @declared_attr
-    def service_letter_contact(cls):
-        return db.relationship('ServiceLetterContact', viewonly=True)
-
+    # TODO: possibly unnecessary after removing letters
     @property
     def reply_to(self):
-        if self.template_type == LETTER_TYPE:
-            return self.service_letter_contact_id
-        else:
-            return None
+        return None
 
     @reply_to.setter
     def reply_to(self, value):
-        if self.template_type == LETTER_TYPE:
-            self.service_letter_contact_id = value
-        elif value is None:
+        if value is None:
             pass
         else:
             raise ValueError('Unable to set sender for {} template'.format(self.template_type))
 
     def get_reply_to_text(self):
-        if self.template_type == LETTER_TYPE:
-            return self.service_letter_contact.contact_block if self.service_letter_contact else None
-        elif self.template_type == EMAIL_TYPE:
+        if self.template_type == EMAIL_TYPE:
             return self.service.get_default_reply_to_email_address()
         elif self.template_type == SMS_TYPE:
             return try_validate_and_format_phone_number(self.service.get_default_sms_sender())
@@ -983,7 +965,6 @@ class TemplateBase(db.Model):
                 }
                 for key in self._as_utils_template().placeholders
             },
-            "letter_contact_block": self.service_letter_contact.contact_block if self.service_letter_contact else None,
         }
 
         return serialized
@@ -1924,32 +1905,6 @@ class ServiceEmailReplyTo(db.Model):
         }
 
 
-class ServiceLetterContact(db.Model):
-    __tablename__ = "service_letter_contacts"
-
-    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
-
-    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
-    service = db.relationship(Service, backref=db.backref("letter_contacts"))
-
-    contact_block = db.Column(db.Text, nullable=False, index=False, unique=False)
-    is_default = db.Column(db.Boolean, nullable=False, default=True)
-    archived = db.Column(db.Boolean, nullable=False, default=False)
-    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
-    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)
-
-    def serialize(self):
-        return {
-            'id': str(self.id),
-            'service_id': str(self.service_id),
-            'contact_block': self.contact_block,
-            'is_default': self.is_default,
-            'archived': self.archived,
-            'created_at': self.created_at.strftime(DATETIME_FORMAT),
-            'updated_at': get_dt_string_or_none(self.updated_at),
-        }
-
-
 class AuthType(db.Model):
     __tablename__ = 'auth_type'