feat: Implement deleteConnection mutation

packages/backend/src/graphql/mutations/delete-connection.ts

@@ -0,0 +1,26 @@
+import { GraphQLString, GraphQLNonNull, GraphQLBoolean } from 'graphql';
+import Connection from '../../models/connection';
+import RequestWithCurrentUser from '../../types/express/request-with-current-user';
+
+type Params = {
+  id: string,
+  data: object
+}
+const deleteConnectionResolver = async (params: Params, req: RequestWithCurrentUser) => {
+  await Connection.query().delete().findOne({
+    user_id: req.currentUser.id,
+    id: params.id
+  })
+
+  return;
+}
+
+const deleteConnection = {
+  type: GraphQLBoolean,
+  args: {
+    id: { type: GraphQLNonNull(GraphQLString) }
+  },
+  resolve: (_: any, params: Params, req: RequestWithCurrentUser) => deleteConnectionResolver(params, req)
+};
+
+export default deleteConnection;