fix: Delta typing

Fix Delta typing to allow meta and values in updates at the
same time.

packages/server-api/src/deltas.ts

@@ -32,24 +32,22 @@ export interface DeltaSubscription {
   }>
 }
 
-// "Classic" Delta with values
-export interface ValuesDelta {
+export interface Delta {
   context?: Context
   updates: Update[]
 }
 
-export interface MetaDelta {
-  metas: Array<{ values: Meta[] }>
-}
-
-// Delta Message
-export type Delta = ValuesDelta | MetaDelta
+/**
+ * @deprecated earlier mistake assumed ValuesDelta and MetaDelta were separate
+ */
+export type ValuesDelta = Delta
 
 export interface Update {
   timestamp?: Timestamp
   source?: Source
   $source?: SourceRef
   values: PathValue[]
+  meta: Meta[]
 }
 
 // Update delta