feature/IO-3478-Mark-Conversation-Unread: Finished

client/src/utils/GraphQLClient.js

@@ -148,6 +148,26 @@ const cache = new InMemoryCache({
     Query: {
       fields: {
         // Note: This is required because we switch from a read to an unread state with a toggle,
+        conversations: {
+          keyArgs: ["where", "order_by"], // keep separate caches for archived/unarchived + sort
+          merge(existing = [], incoming = [], { args, readField }) {
+            const offset = args?.offset ?? 0;
+            const merged = existing ? existing.slice(0) : [];
+
+            for (let i = 0; i < incoming.length; i++) {
+              merged[offset + i] = incoming[i];
+            }
+
+            // Deduplicate by id (important when you also upsert via sockets)
+            const seen = new Set();
+            return merged.filter((ref) => {
+              const id = readField("id", ref);
+              if (!id || seen.has(id)) return false;
+              seen.add(id);
+              return true;
+            });
+          }
+        },
         notifications: {
           merge(existing = [], incoming = [], { readField }) {
             // Create a map to deduplicate by __ref