Move previous suspendUser feature to rejectUsername

graph/typeDefs.graphql

@@ -679,13 +679,21 @@ input SuspendUserInput {
   # TODO: should this be required?
   message: String
 
-  # If set, the user is requested to change its username.
-  mustChangeUsername: Boolean
-
   # If set, the suspension lasts at least until specified date.
   until: Date
 }
 
+# Input for rejectUsername mutation.
+input RejectUsernameInput {
+
+  # id of target user.
+  id: ID!
+
+  # message to be sent to the user.
+  # TODO: should this be required?
+  message: String
+}
+
 # DeleteActionResponse is the response returned with possibly some errors
 # relating to the delete action attempt.
 type DeleteActionResponse implements Response {
@@ -710,6 +718,14 @@ type SuspendUserResponse implements Response {
   errors: [UserError]
 }
 
+# RejectUsernameResponse is the response returned with possibly some errors
+# relating to the reject username action attempt.
+type RejectUsernameResponse implements Response {
+
+  # An array of errors relating to the mutation that occurred.
+  errors: [UserError]
+}
+
 # SetCommentStatusResponse is the response returned with possibly some errors
 # relating to the delete action attempt.
 type SetCommentStatusResponse implements Response {
@@ -785,6 +801,9 @@ type RootMutation {
   # Suspends a user. Requires the `ADMIN` role.
   suspendUser(input: SuspendUserInput!): SuspendUserResponse
 
+  # Suspends a user. Requires the `ADMIN` role.
+  rejectUsername(input: RejectUsernameInput!): RejectUsernameResponse
+
   # Sets Comment status. Requires the `ADMIN` role.
   setCommentStatus(id: ID!, status: COMMENT_STATUS!): SetCommentStatusResponse