diff --git a/src/app/core/audio/audio-recorder.service.ts b/src/app/core/audio/audio-recorder.service.ts
index 794e5d6..7e75bf0 100644
--- a/src/app/core/audio/audio-recorder.service.ts
+++ b/src/app/core/audio/audio-recorder.service.ts
@@ -296,6 +296,17 @@ export class AudioRecorderService {
     }
 
     if (this.webSocket) {
+      // Flush the sub-chunk tail (< CHUNK_SIZE samples) before closing, so the last
+      // ~100ms of speech — often the end of the final sentence — reaches the STT.
+      if (this.webSocket.readyState === WebSocket.OPEN && this.pcmBufferAccumulator.length > 0) {
+        const tail = this.pcmBufferAccumulator;
+        const buffer = new ArrayBuffer(tail.length * 2);
+        const view = new DataView(buffer);
+        for (let i = 0; i < tail.length; i++) {
+          view.setInt16(i * 2, tail[i], true); // little-endian
+        }
+        this.webSocket.send(buffer);
+      }
       // Detach first: a late close event from this socket must not tear down the next one.
       this.webSocket.onopen = null;
       this.webSocket.onerror = null;
diff --git a/src/app/features/discovery/data/discovery-chat.store.spec.ts b/src/app/features/discovery/data/discovery-chat.store.spec.ts
index 3f671ee..d7e1ab5 100644
--- a/src/app/features/discovery/data/discovery-chat.store.spec.ts
+++ b/src/app/features/discovery/data/discovery-chat.store.spec.ts
@@ -360,6 +360,37 @@ describe('DiscoveryChatStore', () => {
     expect(store.blocks()).toHaveLength(0);
   });
 
+  it('warns and ignores an unknown realtime message type instead of failing silently', () => {
+    flushInit([session()]);
+    http
+      .expectOne((r) => r.url === '/api/projects/proj-1/suggestions')
+      .flush(page<SuggestionResponse>([]));
+    // Settle the historical block with each endpoint's real shape: the session's segments and
+    // suggestions are plain arrays (a page here would break the pending-queue reduce), its
+    // stories a page, its transcript an object.
+    http
+      .match(() => true)
+      .forEach((r) => {
+        const url = r.request.url;
+        if (url.endsWith('/transcript')) r.flush({ sessionId: 'sess-1', transcript: '' });
+        else if (url.endsWith('/stories')) r.flush(page<never>([]));
+        else r.flush([]);
+      });
+    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => undefined);
+
+    store.applyRealtime({
+      sessionId: 's-1',
+      type: 'BRAND_NEW_EVENT',
+      occurredAt: new Date().toISOString(),
+    } as never);
+
+    expect(warnSpy).toHaveBeenCalledWith(
+      '[discovery] Unhandled realtime message type:',
+      'BRAND_NEW_EVENT',
+    );
+    warnSpy.mockRestore();
+  });
+
   describe('decide', () => {
     /** Boots one completed session whose queue holds a single pending suggestion. */
     function setupWithPending(): SuggestionResponse {
diff --git a/src/app/features/discovery/data/discovery-chat.store.ts b/src/app/features/discovery/data/discovery-chat.store.ts
index 39340a1..d1869f0 100644
--- a/src/app/features/discovery/data/discovery-chat.store.ts
+++ b/src/app/features/discovery/data/discovery-chat.store.ts
@@ -873,31 +873,39 @@ export class DiscoveryChatStore {
       return;
     }
 
+    // Creation is announced on the project topic; a session block has nothing to update.
+    if (message.type === 'SESSION_CREATED') return;
+
     const status = STATUS_BY_EVENT[message.type];
-    if (status) {
-      const error =
-        message.type === 'FAILED' ? (message as SessionProcessingFailedMessage).reason : null;
-      this.updateBlock(sessionId, (b) => ({
-        ...b,
-        session: {
-          ...b.session,
-          status,
-          processingError: error ?? b.session.processingError,
-        },
-      }));
-      this.recording.syncStatus(sessionId, status);
-      // Keep the project-level live flag in sync even when the lifecycle
-      // reaches us only through the per-session topic.
-      if (status === 'RECORDING' || status === 'PAUSED') {
-        this._liveSessionId.set(sessionId);
-      } else if (this._liveSessionId() === sessionId) {
-        this._liveSessionId.set(null);
-      }
-      // A block created while the session was live never fetched its persisted
-      // timeline. Once the session settles, reload it as a historical block so
-      // segments and resolved decisions survive exactly like after a reload.
-      if (HISTORICAL_STATUSES.includes(status)) this.upgradeToHistorical(sessionId);
+    if (!status) {
+      // A type this build doesn't know (backend shipped a new event first). Log it so a
+      // schema drift is visible in the console instead of a silently dead feature.
+      console.warn('[discovery] Unhandled realtime message type:', message.type);
+      return;
     }
+
+    const error =
+      message.type === 'FAILED' ? (message as SessionProcessingFailedMessage).reason : null;
+    this.updateBlock(sessionId, (b) => ({
+      ...b,
+      session: {
+        ...b.session,
+        status,
+        processingError: error ?? b.session.processingError,
+      },
+    }));
+    this.recording.syncStatus(sessionId, status);
+    // Keep the project-level live flag in sync even when the lifecycle
+    // reaches us only through the per-session topic.
+    if (status === 'RECORDING' || status === 'PAUSED') {
+      this._liveSessionId.set(sessionId);
+    } else if (this._liveSessionId() === sessionId) {
+      this._liveSessionId.set(null);
+    }
+    // A block created while the session was live never fetched its persisted
+    // timeline. Once the session settles, reload it as a historical block so
+    // segments and resolved decisions survive exactly like after a reload.
+    if (HISTORICAL_STATUSES.includes(status)) this.upgradeToHistorical(sessionId);
   }
 
   /**
diff --git a/src/app/features/discovery/data/discovery.models.ts b/src/app/features/discovery/data/discovery.models.ts
index 5c4ea4a..f21be98 100644
--- a/src/app/features/discovery/data/discovery.models.ts
+++ b/src/app/features/discovery/data/discovery.models.ts
@@ -455,11 +455,11 @@ export function editableToAcceptRequest(
 // ---- Realtime (STOMP topic /topic/sessions/{id}) ----
 
 export type SessionEventType =
+  | 'SESSION_CREATED'
   | 'RECORDING_STARTED'
   | 'RECORDING_PAUSED'
   | 'RECORDING_RESUMED'
   | 'RECORDING_STOPPED'
-  | 'SESSION_RESET'
   | 'TRANSCRIPT_SEGMENT'
   | 'TRANSCRIPT_UPLOADED'
   | 'PROCESSING'
diff --git a/src/app/features/discovery/pages/discovery-chat/discovery-chat.ts b/src/app/features/discovery/pages/discovery-chat/discovery-chat.ts
index fce7cb1..418b372 100644
--- a/src/app/features/discovery/pages/discovery-chat/discovery-chat.ts
+++ b/src/app/features/discovery/pages/discovery-chat/discovery-chat.ts
@@ -42,6 +42,7 @@ import {
   lucideUsers,
 } from '@ng-icons/lucide';
 import { AuthStore } from '../../../../core/auth/auth.store';
+import { PermissionsStore } from '../../../../core/authz/permissions.store';
 import { WorkspaceStore } from '../../../workspace/data/workspace.store';
 import { ToastService } from '../../../../shared/toast/toast.service';
 import { messageForError } from '../../../../core/errors/error-message';
@@ -50,7 +51,6 @@ import { AudioSource, supportsMeetingAudio } from '../../../../core/audio/audio-
 import { DiscoveryChatStore, RenderBlock } from '../../data/discovery-chat.store';
 import { AssistantChatStore } from '../../data/assistant-chat.store';
 import { ASSISTANT_MESSAGE_MAX, messageToSend } from '../../data/assistant-chat';
-import { PermissionsStore } from '../../../../core/authz/permissions.store';
 import { SessionRecordingService } from '../../data/session-recording.service';
 import { DecisionEntry } from '../../data/feed';
 import { SessionSpeakersStore } from '../../data/session-speakers.store';