list editing, deleting

bbconf/todo_schema.graphql

@@ -54,6 +54,13 @@ type Mutation {
     user: User! # username needs to be specified as it's non-nullable
   ): List @bb_resolver(_type: insert, _object: List, _fields: { title: "$title", user: "$user" })
 
+  updateList(
+    id: ID!,
+    title: String!
+  ): List @bb_resolver(_type: update, _object: List, _filter: { id: { _eq: "$id" } },  _fields: { title: "$title" })
+
+  deleteList(id: ID!): List @bb_resolver(_type: delete, _object: List, _filter: { id: { _eq: "$id" } })
+
   createTask(
     title: String!,
     description: String,