feat: introduce role based access control

packages/backend/src/models/role.ts

@@ -0,0 +1,39 @@
+import Base from './base';
+import User from './user';
+
+class Role extends Base {
+  id!: string;
+  name!: string;
+  key: string;
+  description: string;
+  users?: User[];
+
+  static tableName = 'roles';
+
+  static jsonSchema = {
+    type: 'object',
+    required: ['name', 'key'],
+
+    properties: {
+      id: { type: 'string', format: 'uuid' },
+      name: { type: 'string', minLength: 1 },
+      key: { type: 'string', minLength: 1 },
+      description: { type: ['string', 'null'], minLength: 1, maxLength: 255 },
+      createdAt: { type: 'string' },
+      updatedAt: { type: 'string' },
+    },
+  };
+
+  static relationMappings = () => ({
+    users: {
+      relation: Base.HasManyRelation,
+      modelClass: User,
+      join: {
+        from: 'roles.id',
+        to: 'users.role_id',
+      },
+    },
+  });
+}
+
+export default Role;