feat: paint cached workspace config from indexeddb on boot

app/javascript/dashboard/helper/CacheHelper/DataManager.js

@@ -1,9 +1,10 @@
 import { openDB } from 'idb';
 import { DATA_VERSION } from './version';
+import { cacheableModels, cacheableModelNames } from './cacheableModels';
 
 export class DataManager {
   constructor(accountId) {
-    this.modelsToSync = ['inbox', 'label', 'team'];
+    this.modelsToSync = cacheableModelNames;
     this.accountId = accountId;
     this.db = null;
   }
@@ -11,12 +12,26 @@ export class DataManager {
   async initDb() {
     if (this.db) return this.db;
     const dbName = `cw-store-${this.accountId}`;
-    this.db = await openDB(`cw-store-${this.accountId}`, DATA_VERSION, {
-      upgrade(db) {
-        db.createObjectStore('cache-keys');
-        db.createObjectStore('inbox', { keyPath: 'id' });
-        db.createObjectStore('label', { keyPath: 'id' });
-        db.createObjectStore('team', { keyPath: 'id' });
+    this.db = await openDB(dbName, DATA_VERSION, {
+      upgrade(db, oldVersion, _newVersion, tx) {
+        // Flush data carried over from a previous schema version so a
+        // DATA_VERSION bump acts as a global cache reset. oldVersion === 0 on
+        // first install, so fresh devices skip this. Clearing before creating
+        // means we only ever clear stores that pre-existed this upgrade.
+        if (oldVersion > 0) {
+          for (let index = 0; index < db.objectStoreNames.length; index += 1) {
+            tx.objectStore(db.objectStoreNames.item(index)).clear();
+          }
+        }
+
+        if (!db.objectStoreNames.contains('cache-keys')) {
+          db.createObjectStore('cache-keys');
+        }
+        cacheableModels.forEach(model => {
+          if (!db.objectStoreNames.contains(model.name)) {
+            db.createObjectStore(model.name, { keyPath: 'id' });
+          }
+        });
       },
     });
 
@@ -41,7 +56,7 @@ export class DataManager {
   async replace({ modelName, data }) {
     this.validateModel(modelName);
 
-    this.db.clear(modelName);
+    await this.db.clear(modelName);
     return this.push({ modelName, data });
   }
 
@@ -65,9 +80,11 @@ export class DataManager {
   }
 
   async setCacheKeys(cacheKeys) {
-    Object.keys(cacheKeys).forEach(async modelName => {
-      this.db.put('cache-keys', cacheKeys[modelName], modelName);
-    });
+    await Promise.all(
+      Object.entries(cacheKeys).map(([modelName, value]) =>
+        this.db.put('cache-keys', value, modelName)
+      )
+    );
   }
 
   async getCacheKey(modelName) {

app/javascript/dashboard/helper/CacheHelper/cacheableModels.js

@@ -0,0 +1,17 @@
+// Single source of truth for IDB-cached workspace config.
+//
+// Each entry must keep `name` equal to the Rails `Model.name.underscore` value
+// so the server's `cache_keys` payload (and the IDB object store name) lines up
+// with what the client looks up.
+//
+// `setMutation` is the full commit path used to seed Vuex from IDB (boot
+// paint) and to swap in refetched rows (event-driven revalidation). Every
+// SET_* mutation must REPLACE its records (not merge) so rows deleted
+// server-side never survive as phantoms.
+export const cacheableModels = [
+  { name: 'inbox', setMutation: 'inboxes/SET_INBOXES' },
+  { name: 'label', setMutation: 'labels/SET_LABELS' },
+  { name: 'team', setMutation: 'teams/SET_TEAMS' },
+];
+
+export const cacheableModelNames = cacheableModels.map(model => model.name);

app/javascript/dashboard/helper/CacheHelper/paintStoresFromCache.js

@@ -0,0 +1,31 @@
+import { DataManager } from './DataManager';
+import { cacheableModels } from './cacheableModels';
+
+// Seed Vuex from IndexedDB before the dashboard renders so warm boots paint
+// cached config instantly. This is purely local — zero network calls.
+//
+// Freshness is handled entirely by the account.cache_invalidated event:
+// RoomChannel transmits the current cache-key map on every (re)subscribe, and
+// the server broadcasts it on every change. dispatchCacheRevalidations diffs
+// those keys against IDB and refetches mismatches — the client never pulls
+// cache keys itself.
+export default async function paintStoresFromCache(store, accountId) {
+  let dm;
+  try {
+    dm = new DataManager(accountId);
+    await dm.initDb();
+  } catch {
+    // IDB unsupported (e.g. Firefox private mode) — silent no-op. Components
+    // will fetch from the network normally via the cache-enabled API client.
+    return;
+  }
+
+  // Stale-while-revalidate paint: commit cached data into Vuex immediately.
+  await Promise.all(
+    cacheableModels.map(async model => {
+      const localData = await dm.get({ modelName: model.name });
+      if (localData.length === 0) return;
+      store.commit(model.setMutation, localData);
+    })
+  );
+}