Clear chats cache if last updated more than 30 days ago (#6913)

frontend/openchat-agent/src/utils/caching.ts

@@ -45,6 +45,7 @@ import {
     MessageContextMap,
     MAX_EVENTS,
     MAX_MESSAGES,
+    ONE_DAY,
     updateCreatedUser,
 } from "openchat-shared";
 import type { Principal } from "@dfinity/principal";
@@ -354,7 +355,21 @@ export async function getCachedChats(
     db: Database,
     principal: Principal,
 ): Promise<ChatStateFull | undefined> {
-    return await (await db).get("chats", principal.toString());
+    const resolvedDb = await db;
+    const chats = await resolvedDb.get("chats", principal.toString());
+
+    if (
+        chats !== undefined &&
+        chats.latestUserCanisterUpdates < BigInt(Date.now() - 30 * ONE_DAY)
+    ) {
+        // If the cache was last updated more than 30 days ago, clear the cache and return undefined
+        const storeNames = resolvedDb.objectStoreNames;
+        for (let i = 0; i < storeNames.length; i++) {
+            await resolvedDb.clear(storeNames[i]);
+        }
+        return undefined;
+    }
+    return chats;
 }
 
 export async function setCachedChats(