diff --git a/.gitea/workflows/e2e-chat.yml b/.gitea/workflows/e2e-chat.yml
index a186f5a3d..59276345a 100644
--- a/.gitea/workflows/e2e-chat.yml
+++ b/.gitea/workflows/e2e-chat.yml
@@ -278,16 +278,33 @@ jobs:
           export NEXT_PUBLIC_WS_URL="ws://127.0.0.1:${PLATFORM_PORT}/ws"
           npx next dev --turbopack -p "${CANVAS_PORT}" > canvas.log 2>&1 &
           echo $! > canvas.pid
-          for i in $(seq 1 30); do
-            if curl -sf "http://localhost:${CANVAS_PORT}" > /dev/null 2>&1; then
-              echo "Canvas up after ${i}s"
-              exit 0
+          # Readiness must wait for the actual chat route to *compile*, not
+          # just for the dev server to bind the port. `next dev --turbopack`
+          # accepts the TCP connection well before it has compiled a route
+          # on first request, so a bare `curl /` can 200 (or hang) while the
+          # page the tests load is still building. We therefore probe the
+          # real route the specs navigate to (`/?m=chat`) and require a 2xx,
+          # which only happens once Turbopack has finished the first
+          # compile. The previous 30s budget was also too tight for a cold
+          # Turbopack first-compile on a loaded operator-host runner — the
+          # `Canvas did not start in 30s` flake. Raise to 120s (job
+          # timeout-minutes is 15, so this is comfortably bounded) and probe
+          # every 2s.
+          READY=""
+          for i in $(seq 1 60); do
+            CODE=$(curl -s -o /dev/null -w '%{http_code}' "http://localhost:${CANVAS_PORT}/?m=chat" 2>/dev/null || echo 000)
+            if [ "$CODE" -ge 200 ] && [ "$CODE" -lt 400 ]; then
+              echo "Canvas (chat route compiled) up after ~$((i*2))s (HTTP ${CODE})"
+              READY=1
+              break
             fi
-            sleep 1
+            sleep 2
           done
-          echo "::error::Canvas did not start in 30s"
-          cat canvas.log || true
-          exit 1
+          if [ -z "$READY" ]; then
+            echo "::error::Canvas chat route did not compile in 120s (last HTTP ${CODE})"
+            cat canvas.log || true
+            exit 1
+          fi
 
       - name: Run Playwright E2E tests
         if: needs.detect-changes.outputs.chat == 'true'
diff --git a/canvas/e2e/chat-mobile.spec.ts b/canvas/e2e/chat-mobile.spec.ts
index ddc2bab70..d51a6fc90 100644
--- a/canvas/e2e/chat-mobile.spec.ts
+++ b/canvas/e2e/chat-mobile.spec.ts
@@ -60,11 +60,26 @@ test.describe("MobileChat", () => {
 
     await expect(page.getByText("Echo: Mobile persistence")).toBeVisible({ timeout: 15_000 });
 
+    // Reload and deterministically wait for the chat-history GET that
+    // rehydrates the transcript to come back 2xx, rather than racing a
+    // fixed-timeout render assertion against an in-flight fetch. The
+    // server now persists the a2a_receive row SYNCHRONOUSLY before the
+    // send's 200 (workspace-server logA2ASuccess), so the row is
+    // guaranteed present by the time this GET runs — the wait is for
+    // hydration latency, not for a still-racing write.
+    const historyResponse = page.waitForResponse(
+      (resp) =>
+        resp.url().includes("/chat-history") &&
+        resp.request().method() === "GET" &&
+        resp.status() === 200,
+      { timeout: 15_000 },
+    );
     await page.reload();
     await page.waitForSelector("[data-testid='chat-panel']", { timeout: 10_000 });
+    await historyResponse;
 
-    await expect(page.getByText("Mobile persistence", { exact: true })).toBeVisible({ timeout: 5_000 });
-    await expect(page.getByText("Echo: Mobile persistence")).toBeVisible({ timeout: 5_000 });
+    await expect(page.getByText("Mobile persistence", { exact: true })).toBeVisible();
+    await expect(page.getByText("Echo: Mobile persistence")).toBeVisible();
   });
 
   test("composer auto-grows with multi-line text", async ({ page }) => {
diff --git a/workspace-server/internal/handlers/a2a_proxy_helpers.go b/workspace-server/internal/handlers/a2a_proxy_helpers.go
index 920e8b5ba..06434ec60 100644
--- a/workspace-server/internal/handlers/a2a_proxy_helpers.go
+++ b/workspace-server/internal/handlers/a2a_proxy_helpers.go
@@ -383,23 +383,48 @@ func (h *WorkspaceHandler) logA2ASuccess(ctx context.Context, workspaceID, calle
 	}
 	summary := a2aMethod + " → " + wsNameForLog
 	toolTrace := extractToolTrace(respBody)
-	parent := ctx
-	h.goAsync(func() {
-		logCtx, cancel := context.WithTimeout(context.WithoutCancel(parent), 30*time.Second)
-		defer cancel()
-		LogActivity(logCtx, h.broadcaster, ActivityParams{
-			WorkspaceID:  workspaceID,
-			ActivityType: "a2a_receive",
-			SourceID:     nilIfEmpty(callerID),
-			TargetID:     &workspaceID,
-			Method:       &a2aMethod,
-			Summary:      &summary,
-			RequestBody:  json.RawMessage(body),
-			ResponseBody: json.RawMessage(respBody),
-			ToolTrace:    toolTrace,
-			DurationMs:   &durationMs,
-			Status:       logStatus,
-		})
+
+	// DATA-LOSS FIX (internal#470 / #1347 push-mode sibling): this
+	// a2a_receive row is the ONLY durable record of a push-mode chat
+	// round-trip — request_body carries the user's message, response_body
+	// carries the agent's reply, and chat-history hydration
+	// (messagestore.PostgresMessageStore) reads BOTH back to rebuild the
+	// transcript on canvas reopen / reload. It MUST be written
+	// SYNCHRONOUSLY, before proxyA2ARequest returns and ProxyA2A flushes
+	// the 200 to the canvas — otherwise the canvas sees the reply
+	// acknowledged (and rendered optimistically) while the row is still
+	// racing in a detached goroutine, and a reload (or a workspace-server
+	// restart / deploy / OOM) between the 200 and the goroutine's commit
+	// loses the message permanently on reopen.
+	//
+	// This mirrors the discipline already applied to the poll-mode ingest
+	// path (logA2AReceiveQueued / persistUserMessageAtIngest); the
+	// push-mode counterpart was left async, which the E2E Chat
+	// "history persists across reload" test surfaced as an intermittent
+	// red (the reload out-raced the INSERT).
+	//
+	//   - context.WithoutCancel: a client disconnect on chat-exit (which
+	//     cancels the inbound request ctx) MUST NOT abort this write.
+	//   - SYNCHRONOUS (no goAsync): the row must be durable before the 200.
+	//   - Best-effort: LogActivity logs+swallows INSERT errors internally,
+	//     so a DB hiccup never blocks or fails the user's send — behaviour
+	//     for that one request is never worse than the pre-fix async path.
+	//   - The post-commit ACTIVITY_LOGGED broadcast still fires inside
+	//     LogActivity; the durable row is the truth the canvas re-reads.
+	logCtx, cancel := context.WithTimeout(context.WithoutCancel(ctx), 30*time.Second)
+	defer cancel()
+	LogActivity(logCtx, h.broadcaster, ActivityParams{
+		WorkspaceID:  workspaceID,
+		ActivityType: "a2a_receive",
+		SourceID:     nilIfEmpty(callerID),
+		TargetID:     &workspaceID,
+		Method:       &a2aMethod,
+		Summary:      &summary,
+		RequestBody:  json.RawMessage(body),
+		ResponseBody: json.RawMessage(respBody),
+		ToolTrace:    toolTrace,
+		DurationMs:   &durationMs,
+		Status:       logStatus,
 	})
 
 	if callerID == "" && statusCode < 400 {