Order Discord metadata-only comment snapshots deterministically

Keep exact comment membership assertions stable across PostgreSQL row orders and bound the existing external integration fixture with a typed four-connection option.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/chat-channels.integration.test.ts

@@ -1122,6 +1122,7 @@ describeEmbeddedPostgres("chat channel control-plane integration", () => {
     // Do not expire or time out its connections on those virtual clock jumps.
     db = createDb(externalTestDatabaseUrl ?? tempDb!.connectionString, {
       idleTimeoutSeconds: 0, connectTimeoutSeconds: 0, maxLifetimeSeconds: 0,
+      ...(externalTestDatabaseUrl ? { maxConnections: 4 } : {}),
     });
   }, 90_000);
 
@@ -60453,7 +60454,8 @@ describeEmbeddedPostgres("chat channel control-plane integration", () => {
         const commentsBefore = await db
           .select({ id: issueComments.id })
           .from(issueComments)
-          .where(eq(issueComments.issueId, conversation.issueId));
+          .where(eq(issueComments.issueId, conversation.issueId))
+          .orderBy(asc(issueComments.id));
         const wakesBefore = wakeup.mock.calls.length;
         const reactionsBefore = providerRuntime.reactions.length;
         const postsBefore = providerRuntime.posts.length;
@@ -60483,7 +60485,8 @@ describeEmbeddedPostgres("chat channel control-plane integration", () => {
             await db
               .select({ id: issueComments.id })
               .from(issueComments)
-              .where(eq(issueComments.issueId, conversation.issueId)),
+              .where(eq(issueComments.issueId, conversation.issueId))
+              .orderBy(asc(issueComments.id)),
           ).toEqual(commentsBefore);
           expect(wakeup).toHaveBeenCalledTimes(wakesBefore);
           expect(cancelRun).not.toHaveBeenCalled();