diff --git a/web/src/models.d.ts b/web/src/models.d.ts
index 7774e46..1a93c3c 100644
--- a/web/src/models.d.ts
+++ b/web/src/models.d.ts
@@ -1,3 +1,5 @@
+export enum MeasureType { Simple }
+
 export interface ApiToken {
   id: string;
   userId: string;
@@ -12,21 +14,27 @@ export interface LoginSubmit {
   password: string;
 }
 
-export interface Measure {
+export interface MeasureConfig {
+  type: string;
+}
+
+export interface Measure<C extends MeasureConfig> {
   id: string;
   userId: string;
   slug: string;
   name: string;
   description: string;
-  config: object;
+  config: C;
 }
 
-export interface Measurement {
+export interface MeasurementMeta {}
+
+export interface Measurement<M extends MeasurementMeta> {
   id: string;
   measureId: string;
   value: number;
   timestamp: Date;
-  extData: object;
+  extData: M;
 }
 
 export interface User {