fix off-by-one error in visible messages for current channel

spacetimedb/src/reducers.ts

@@ -277,7 +277,8 @@ export const subscribe_to_channel = spacetimedb.reducer(
   (ctx, { channelId }) => {
     const hwm = ctx.db.channel_high_water_mark.channel_id.find(channelId);
     const currentMax = hwm ? hwm.last_seq_id : 0n;
-    const earliest = currentMax > 100n ? currentMax - 100n : 0n;
+    // Sync exactly 100 messages (e.g. if max is 100, we want 1-100 inclusive, so earliest is 1)
+    const earliest = currentMax > 99n ? currentMax - 99n : 1n;
 
     const existing = ctx.db.channel_subscription.identity.find(ctx.sender);
     if (existing) {

src/chat/services/messaging.svelte.ts

@@ -308,6 +308,7 @@ export class MessagingService {
 
     this.isLoadingMore = true;
     try {
+        // Fetch exactly 100 more messages (inclusive range)
         const newEarliest = oldestSeq > 100n ? oldestSeq - 100n : 1n;
 
         this.#extendSubscriptionReducer({

utils/stress.ts

@@ -86,11 +86,6 @@ const builder = DbConnection.builder()
 
     // New Architecture: Good practice to subscribe to our own state
     console.log("Subscribing to system configuration and user state...");
-    conn.subscriptionBuilder().subscribe([
-        "SELECT * FROM system_configuration",
-        `SELECT * FROM user WHERE identity = 0x${identity.toHexString()}`,
-        "SELECT * FROM my_channel_subscriptions"
-    ]);
 
     // Give it a brief moment to initialize before hammering
     setTimeout(startStressTest, 1000);