flowtyped everything, some functional, safety, and structural changes

models/Server.js

@@ -1,4 +1,22 @@
-module.exports = (sql, DataTypes) => {
+// @flow
+import type Sequelize, { DataTypes as DT } from 'sequelize'
+
+export type Category = {
+  hidden: boolean,
+  name: string,
+  roles: string[],
+  type: 'single' | 'multi' | string
+}
+
+export type ServerModel = {
+  id: string,
+  categories: {
+    [uuid: string]: Category
+  },
+  message: string
+}
+
+export default (sql: Sequelize, DataTypes: DT) => {
   return sql.define('server', {
     id: { // discord snowflake
       type: DataTypes.TEXT,