add group registry for MLS push notifications

Server now tracks MLS groups (synced from clients) and subscribes
to kind 445 events on group relays, sending push to all members
except the sender. Registry persisted to Redis across restarts.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

1 files changed, 12 insertions, 1 deletions

diff --git a/index.ts b/index.ts
index a6cfa3de..f557bba0 100644
--- a/index.ts
+++ b/index.ts
@@ -22,7 +22,7 @@ import { getFx } from "$lib/rates";
 import { sendHeartbeat, websocket } from "$lib/sockets";
 import { initTigerBeetle } from "$lib/tb";
 import { startZmq } from "$lib/zmq";
-import { listenForDMs } from "$lib/dmNotifications";
+import { listenForDMs, syncGroupsAndSave } from "$lib/dmNotifications";
 import { initMlsIndex } from "$lib/mls";
 
 import ecash from "$routes/ecash";
@@ -194,6 +194,17 @@ app.get("/trust", auth, users.trust);
 app.post("/trust", auth, users.addTrust);
 app.post("/trust/delete", auth, users.deleteTrust);
 
+app.post("/groups/sync", auth, async (c) => {
+  try {
+    const { groups } = await c.req.json();
+    if (!Array.isArray(groups)) return c.json("invalid groups", 400);
+    await syncGroupsAndSave(groups);
+    return c.json({ ok: true });
+  } catch (e: any) {
+    return c.json(e.message, 500);
+  }
+});
+
 app.get("/subscriptions", auth, users.subscriptions);
 app.post("/subscription", auth, users.subscription);
 app.post("/subscription/delete", auth, users.deleteSubscription);