chore: Migrate authentication to new tables (#1929)

This work provides a foundation for a more pluggable authentication system such as the one outlined in #1317.

closes #1317

server/models/UserAuthentication.js

@@ -0,0 +1,24 @@
+// @flow
+import { DataTypes, sequelize, encryptedFields } from "../sequelize";
+
+const UserAuthentication = sequelize.define("user_authentications", {
+  id: {
+    type: DataTypes.UUID,
+    defaultValue: DataTypes.UUIDV4,
+    primaryKey: true,
+  },
+  scopes: DataTypes.ARRAY(DataTypes.STRING),
+  accessToken: encryptedFields().vault("accessToken"),
+  refreshToken: encryptedFields().vault("refreshToken"),
+  providerId: {
+    type: DataTypes.STRING,
+    unique: true,
+  },
+});
+
+UserAuthentication.associate = (models) => {
+  UserAuthentication.belongsTo(models.AuthenticationProvider);
+  UserAuthentication.belongsTo(models.User);
+};
+
+export default UserAuthentication;