fix(backup): show explicit sign-in prompt after database restore

Restoring a backup replaces the database, invalidating the database-backed
session (Auth.js session strategy: database). The old code silently reloaded
the page, leaving users on an empty board or a login screen with no context.

Replace the opaque reload with an explicit completion state that informs the
user their session was invalidated and auto-redirects to the sign-in page
(bypassing bfcache so the stale board cannot be restored).

apps/nextjs/src/components/backup/database-restore-flow.tsx

@@ -1,10 +1,10 @@
 "use client";
 
-import { useCallback, useRef, useState } from "react";
-import { Alert, Button, Group, Loader, rem, Stack, Text } from "@mantine/core";
+import { useCallback, useEffect, useRef, useState } from "react";
+import { Alert, Button, Group, Loader, rem, Stack, Text, ThemeIcon } from "@mantine/core";
 import type { FileWithPath } from "@mantine/dropzone";
 import { Dropzone, MIME_TYPES } from "@mantine/dropzone";
-import { IconAlertTriangle, IconArrowRight, IconFileZip, IconUpload, IconX } from "@tabler/icons-react";
+import { IconAlertTriangle, IconArrowRight, IconCheck, IconFileZip, IconUpload, IconX } from "@tabler/icons-react";
 
 import "@mantine/dropzone/styles.css";
 
@@ -30,8 +30,17 @@ export const DatabaseRestoreFlow = ({ variant = "card", onRestoreComplete }: Dat
   const apiDoneRef = useRef(false);
   const animDoneRef = useRef(false);
   const apiErrorRef = useRef<string | null>(null);
+  const redirectTimerRef = useRef<number | null>(null);
   const { analysis, loading, error: analysisError, migrationProgress, analyzeFile, reset } = useBackupAnalysis();
 
+  useEffect(() => {
+    return () => {
+      if (redirectTimerRef.current !== null) {
+        window.clearTimeout(redirectTimerRef.current);
+      }
+    };
+  }, []);
+
   const handleFileDrop = useCallback(
     (files: FileWithPath[]) => {
       const droppedFile = files[0];
@@ -45,6 +54,10 @@ export const DatabaseRestoreFlow = ({ variant = "card", onRestoreComplete }: Dat
   );
 
   const handleClear = useCallback(() => {
+    if (redirectTimerRef.current !== null) {
+      window.clearTimeout(redirectTimerRef.current);
+      redirectTimerRef.current = null;
+    }
     setFile(null);
     setStep("upload");
     setImportError(null);
@@ -65,9 +78,20 @@ export const DatabaseRestoreFlow = ({ variant = "card", onRestoreComplete }: Dat
 
     if (!animDoneRef.current) return;
     onRestoreComplete?.();
-    window.location.reload();
+    setStep("complete");
+    redirectTimerRef.current = window.setTimeout(() => {
+      window.location.assign("/auth/login");
+    }, 2000);
   }, [onRestoreComplete]);
 
+  const handleSignInAgain = useCallback(() => {
+    if (redirectTimerRef.current !== null) {
+      window.clearTimeout(redirectTimerRef.current);
+      redirectTimerRef.current = null;
+    }
+    window.location.assign("/auth/login");
+  }, []);
+
   const handleConfirm = useCallback(async () => {
     if (!file) return;
     setStep("restoring");
@@ -212,6 +236,23 @@ export const DatabaseRestoreFlow = ({ variant = "card", onRestoreComplete }: Dat
     );
   }
 
+  if (step === "complete") {
+    return (
+      <Stack gap="md" align="center" py="lg">
+        <ThemeIcon size={64} radius="xl" color="green" variant="light">
+          <IconCheck size={32} style={{ width: rem(40), height: rem(40) }} stroke={1.5} />
+        </ThemeIcon>
+        <Text size="lg" fw={600} ta="center">
+          {t("complete.title")}
+        </Text>
+        <Text size="sm" c="dimmed" ta="center" maw={480}>
+          {t("complete.message")}
+        </Text>
+        <Button onClick={handleSignInAgain}>{t("complete.button")}</Button>
+      </Stack>
+    );
+  }
+
   if (step === "error") {
     return (
       <Stack gap="md">

apps/nextjs/src/components/backup/types.ts

@@ -25,6 +25,6 @@ export interface BackupAnalysis {
   migrations: MigrationStatus;
 }
 
-export type RestoreStep = "upload" | "preview" | "confirm" | "restoring" | "error";
+export type RestoreStep = "upload" | "preview" | "confirm" | "restoring" | "complete" | "error";
 
 export const PREVIEW_TABLE_KEYS = ["board", "user", "app", "integration", "item", "media", "search_engine"] as const;

packages/translation/src/lang/en.json

@@ -5276,7 +5276,8 @@
             },
             "complete": {
               "title": "Restore Complete",
-              "message": "Database has been restored successfully. The server is restarting — please refresh the page in a few seconds."
+              "message": "Database has been restored successfully and the server has restarted. Your previous session was invalidated, so you need to sign in again to see the restored board.",
+              "button": "Sign in now"
             },
             "failed": {
               "title": "Restore Failed"