feat: add app connections w/ testing and deleting functions

packages/web/src/graphql/cache.ts

@@ -4,6 +4,31 @@ const cache = new InMemoryCache({
   typePolicies: {
     App: {
       keyFields: ['key']
+    },
+    Mutation: {
+      mutationType: true,
+      fields: {
+        createConnection: {
+          merge(existing, newConnection, { args, readField, cache }) {
+            const appKey = readField('key', newConnection);
+            const appCacheId = cache.identify({
+              __typename: 'App',
+              key: appKey,
+            });
+
+            cache.modify({
+              id: appCacheId,
+              fields: {
+                connections: (existingConnections) => {
+                  return [...existingConnections, newConnection];
+                }
+              }
+            });
+
+            return newConnection;
+          }
+        }
+      }
     }
   }
 });