feat: paginate chat history (#903)

app/(chat)/api/history/route.ts

@@ -1,14 +1,37 @@
 import { auth } from '@/app/(auth)/auth';
+import { NextRequest } from 'next/server';
 import { getChatsByUserId } from '@/lib/db/queries';
 
-export async function GET() {
+export async function GET(request: NextRequest) {
+  const { searchParams } = request.nextUrl;
+
+  const limit = parseInt(searchParams.get('limit') || '10');
+  const startingAfter = searchParams.get('starting_after');
+  const endingBefore = searchParams.get('ending_before');
+
+  if (startingAfter && endingBefore) {
+    return Response.json(
+      'Only one of starting_after or ending_before can be provided!',
+      { status: 400 },
+    );
+  }
+
   const session = await auth();
 
-  if (!session || !session.user) {
+  if (!session?.user?.id) {
     return Response.json('Unauthorized!', { status: 401 });
   }
 
-  // biome-ignore lint: Forbidden non-null assertion.
+  try {
-  const chats = await getChatsByUserId({ id: session.user.id! });
+    const chats = await getChatsByUserId({
+      id: session.user.id,
+      limit,
+      startingAfter,
+      endingBefore,
+    });
+
     return Response.json(chats);
+  } catch (_) {
+    return Response.json('Failed to fetch chats!', { status: 500 });
+  }
 }

components/chat.tsx

@@ -10,9 +10,11 @@ import { fetcher, generateUUID } from '@/lib/utils';
 import { Artifact } from './artifact';
 import { MultimodalInput } from './multimodal-input';
 import { Messages } from './messages';
-import { VisibilityType } from './visibility-selector';
+import type { VisibilityType } from './visibility-selector';
 import { useArtifactSelector } from '@/hooks/use-artifact';
 import { toast } from 'sonner';
+import { unstable_serialize } from 'swr/infinite';
+import { getChatHistoryPaginationKey } from './sidebar-history';
 
 export function Chat({
   id,
@@ -47,7 +49,7 @@ export function Chat({
     sendExtraMessageFields: true,
     generateId: generateUUID,
     onFinish: () => {
-      mutate('/api/history');
+      mutate(unstable_serialize(getChatHistoryPaginationKey));
     },
     onError: () => {
       toast.error('An error occured, please try again!');

components/sidebar-history-item.tsx

@@ -0,0 +1,118 @@
+import { Chat } from '@/lib/db/schema';
+import {
+  SidebarMenuAction,
+  SidebarMenuButton,
+  SidebarMenuItem,
+} from './ui/sidebar';
+import Link from 'next/link';
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuPortal,
+  DropdownMenuSub,
+  DropdownMenuSubContent,
+  DropdownMenuSubTrigger,
+  DropdownMenuTrigger,
+} from './ui/dropdown-menu';
+import {
+  CheckCircleFillIcon,
+  GlobeIcon,
+  LockIcon,
+  MoreHorizontalIcon,
+  ShareIcon,
+  TrashIcon,
+} from './icons';
+import { memo } from 'react';
+import { useChatVisibility } from '@/hooks/use-chat-visibility';
+
+const PureChatItem = ({
+  chat,
+  isActive,
+  onDelete,
+  setOpenMobile,
+}: {
+  chat: Chat;
+  isActive: boolean;
+  onDelete: (chatId: string) => void;
+  setOpenMobile: (open: boolean) => void;
+}) => {
+  const { visibilityType, setVisibilityType } = useChatVisibility({
+    chatId: chat.id,
+    initialVisibility: chat.visibility,
+  });
+
+  return (
+    <SidebarMenuItem>
+      <SidebarMenuButton asChild isActive={isActive}>
+        <Link href={`/chat/${chat.id}`} onClick={() => setOpenMobile(false)}>
+          <span>{chat.title}</span>
+        </Link>
+      </SidebarMenuButton>
+
+      <DropdownMenu modal={true}>
+        <DropdownMenuTrigger asChild>
+          <SidebarMenuAction
+            className="data-[state=open]:bg-sidebar-accent data-[state=open]:text-sidebar-accent-foreground mr-0.5"
+            showOnHover={!isActive}
+          >
+            <MoreHorizontalIcon />
+            <span className="sr-only">More</span>
+          </SidebarMenuAction>
+        </DropdownMenuTrigger>
+
+        <DropdownMenuContent side="bottom" align="end">
+          <DropdownMenuSub>
+            <DropdownMenuSubTrigger className="cursor-pointer">
+              <ShareIcon />
+              <span>Share</span>
+            </DropdownMenuSubTrigger>
+            <DropdownMenuPortal>
+              <DropdownMenuSubContent>
+                <DropdownMenuItem
+                  className="cursor-pointer flex-row justify-between"
+                  onClick={() => {
+                    setVisibilityType('private');
+                  }}
+                >
+                  <div className="flex flex-row gap-2 items-center">
+                    <LockIcon size={12} />
+                    <span>Private</span>
+                  </div>
+                  {visibilityType === 'private' ? (
+                    <CheckCircleFillIcon />
+                  ) : null}
+                </DropdownMenuItem>
+                <DropdownMenuItem
+                  className="cursor-pointer flex-row justify-between"
+                  onClick={() => {
+                    setVisibilityType('public');
+                  }}
+                >
+                  <div className="flex flex-row gap-2 items-center">
+                    <GlobeIcon />
+                    <span>Public</span>
+                  </div>
+                  {visibilityType === 'public' ? <CheckCircleFillIcon /> : null}
+                </DropdownMenuItem>
+              </DropdownMenuSubContent>
+            </DropdownMenuPortal>
+          </DropdownMenuSub>
+
+          <DropdownMenuItem
+            className="cursor-pointer text-destructive focus:bg-destructive/15 focus:text-destructive dark:text-red-500"
+            onSelect={() => onDelete(chat.id)}
+          >
+            <TrashIcon />
+            <span>Delete</span>
+          </DropdownMenuItem>
+        </DropdownMenuContent>
+      </DropdownMenu>
+    </SidebarMenuItem>
+  );
+};
+
+export const ChatItem = memo(PureChatItem, (prevProps, nextProps) => {
+  if (prevProps.isActive !== nextProps.isActive) return false;
+  return true;
+});

components/sidebar-history.tsx

@@ -1,21 +1,11 @@
 'use client';
 
 import { isToday, isYesterday, subMonths, subWeeks } from 'date-fns';
-import Link from 'next/link';
+import { useParams, useRouter } from 'next/navigation';
-import { useParams, usePathname, useRouter } from 'next/navigation';
 import type { User } from 'next-auth';
-import { memo, useEffect, useState } from 'react';
+import { useState } from 'react';
 import { toast } from 'sonner';
-import useSWR from 'swr';
+import { motion } from 'framer-motion';
-
-import {
-  CheckCircleFillIcon,
-  GlobeIcon,
-  LockIcon,
-  MoreHorizontalIcon,
-  ShareIcon,
-  TrashIcon,
-} from '@/components/icons';
 import {
   AlertDialog,
   AlertDialogAction,
@@ -26,29 +16,17 @@ import {
   AlertDialogHeader,
   AlertDialogTitle,
 } from '@/components/ui/alert-dialog';
-import {
-  DropdownMenu,
-  DropdownMenuContent,
-  DropdownMenuItem,
-  DropdownMenuPortal,
-  DropdownMenuSeparator,
-  DropdownMenuSub,
-  DropdownMenuSubContent,
-  DropdownMenuSubTrigger,
-  DropdownMenuTrigger,
-} from '@/components/ui/dropdown-menu';
 import {
   SidebarGroup,
   SidebarGroupContent,
   SidebarMenu,
-  SidebarMenuAction,
-  SidebarMenuButton,
-  SidebarMenuItem,
   useSidebar,
 } from '@/components/ui/sidebar';
 import type { Chat } from '@/lib/db/schema';
 import { fetcher } from '@/lib/utils';
-import { useChatVisibility } from '@/hooks/use-chat-visibility';
+import { ChatItem } from './sidebar-history-item';
+import useSWRInfinite from 'swr/infinite';
+import { LoaderIcon } from './icons';
 
 type GroupedChats = {
   today: Chat[];
@@ -58,116 +36,89 @@ type GroupedChats = {
   older: Chat[];
 };
 
-const PureChatItem = ({
+export interface ChatHistory {
-  chat,
+  chats: Array<Chat>;
-  isActive,
+  hasMore: boolean;
-  onDelete,
+}
-  setOpenMobile,
-}: {
-  chat: Chat;
-  isActive: boolean;
-  onDelete: (chatId: string) => void;
-  setOpenMobile: (open: boolean) => void;
-}) => {
-  const { visibilityType, setVisibilityType } = useChatVisibility({
-    chatId: chat.id,
-    initialVisibility: chat.visibility,
-  });
 
-  return (
+const PAGE_SIZE = 20;
-    <SidebarMenuItem>
-      <SidebarMenuButton asChild isActive={isActive}>
-        <Link href={`/chat/${chat.id}`} onClick={() => setOpenMobile(false)}>
-          <span>{chat.title}</span>
-        </Link>
-      </SidebarMenuButton>
 
-      <DropdownMenu modal={true}>
+const groupChatsByDate = (chats: Chat[]): GroupedChats => {
-        <DropdownMenuTrigger asChild>
+  const now = new Date();
-          <SidebarMenuAction
+  const oneWeekAgo = subWeeks(now, 1);
-            className="data-[state=open]:bg-sidebar-accent data-[state=open]:text-sidebar-accent-foreground mr-0.5"
+  const oneMonthAgo = subMonths(now, 1);
-            showOnHover={!isActive}
-          >
-            <MoreHorizontalIcon />
-            <span className="sr-only">More</span>
-          </SidebarMenuAction>
-        </DropdownMenuTrigger>
 
-        <DropdownMenuContent side="bottom" align="end">
+  return chats.reduce(
-          <DropdownMenuSub>
+    (groups, chat) => {
-            <DropdownMenuSubTrigger className="cursor-pointer">
+      const chatDate = new Date(chat.createdAt);
-              <ShareIcon />
-              <span>Share</span>
-            </DropdownMenuSubTrigger>
-            <DropdownMenuPortal>
-              <DropdownMenuSubContent>
-                <DropdownMenuItem
-                  className="cursor-pointer flex-row justify-between"
-                  onClick={() => {
-                    setVisibilityType('private');
-                  }}
-                >
-                  <div className="flex flex-row gap-2 items-center">
-                    <LockIcon size={12} />
-                    <span>Private</span>
-                  </div>
-                  {visibilityType === 'private' ? (
-                    <CheckCircleFillIcon />
-                  ) : null}
-                </DropdownMenuItem>
-                <DropdownMenuItem
-                  className="cursor-pointer flex-row justify-between"
-                  onClick={() => {
-                    setVisibilityType('public');
-                  }}
-                >
-                  <div className="flex flex-row gap-2 items-center">
-                    <GlobeIcon />
-                    <span>Public</span>
-                  </div>
-                  {visibilityType === 'public' ? <CheckCircleFillIcon /> : null}
-                </DropdownMenuItem>
-              </DropdownMenuSubContent>
-            </DropdownMenuPortal>
-          </DropdownMenuSub>
 
-          <DropdownMenuItem
+      if (isToday(chatDate)) {
-            className="cursor-pointer text-destructive focus:bg-destructive/15 focus:text-destructive dark:text-red-500"
+        groups.today.push(chat);
-            onSelect={() => onDelete(chat.id)}
+      } else if (isYesterday(chatDate)) {
-          >
+        groups.yesterday.push(chat);
-            <TrashIcon />
+      } else if (chatDate > oneWeekAgo) {
-            <span>Delete</span>
+        groups.lastWeek.push(chat);
-          </DropdownMenuItem>
+      } else if (chatDate > oneMonthAgo) {
-        </DropdownMenuContent>
+        groups.lastMonth.push(chat);
-      </DropdownMenu>
+      } else {
-    </SidebarMenuItem>
+        groups.older.push(chat);
+      }
+
+      return groups;
+    },
+    {
+      today: [],
+      yesterday: [],
+      lastWeek: [],
+      lastMonth: [],
+      older: [],
+    } as GroupedChats,
   );
 };
 
-export const ChatItem = memo(PureChatItem, (prevProps, nextProps) => {
+export function getChatHistoryPaginationKey(
-  if (prevProps.isActive !== nextProps.isActive) return false;
+  pageIndex: number,
-  return true;
+  previousPageData: ChatHistory,
-});
+) {
+  if (previousPageData && previousPageData.hasMore === false) {
+    return null;
+  }
+
+  if (pageIndex === 0) return `/api/history?limit=${PAGE_SIZE}`;
+
+  const firstChatFromPage = previousPageData.chats.at(-1);
+
+  if (!firstChatFromPage) return null;
+
+  return `/api/history?ending_before=${firstChatFromPage.id}&limit=${PAGE_SIZE}`;
+}
 
 export function SidebarHistory({ user }: { user: User | undefined }) {
   const { setOpenMobile } = useSidebar();
   const { id } = useParams();
-  const pathname = usePathname();
+
   const {
-    data: history,
+    data: paginatedChatHistories,
+    setSize,
+    isValidating,
     isLoading,
     mutate,
-  } = useSWR<Array<Chat>>(user ? '/api/history' : null, fetcher, {
+  } = useSWRInfinite<ChatHistory>(getChatHistoryPaginationKey, fetcher, {
     fallbackData: [],
   });
 
-  useEffect(() => {
+  const router = useRouter();
-    mutate();
-  }, [pathname, mutate]);
-
   const [deleteId, setDeleteId] = useState<string | null>(null);
   const [showDeleteDialog, setShowDeleteDialog] = useState(false);
-  const router = useRouter();
+
+  const hasReachedEnd = paginatedChatHistories
+    ? paginatedChatHistories.some((page) => page.hasMore === false)
+    : false;
+
+  const hasEmptyChatHistory = paginatedChatHistories
+    ? paginatedChatHistories.every((page) => page.chats.length === 0)
+    : false;
+
   const handleDelete = async () => {
     const deletePromise = fetch(`/api/chat?id=${deleteId}`, {
       method: 'DELETE',
@@ -176,11 +127,15 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
     toast.promise(deletePromise, {
       loading: 'Deleting chat...',
       success: () => {
-        mutate((history) => {
+        mutate((chatHistories) => {
-          if (history) {
+          if (chatHistories) {
-            return history.filter((h) => h.id !== id);
+            return chatHistories.map((chatHistory) => ({
+              ...chatHistory,
+              chats: chatHistory.chats.filter((chat) => chat.id !== deleteId),
+            }));
           }
         });
+
         return 'Chat deleted successfully';
       },
       error: 'Failed to delete chat',
@@ -234,7 +189,7 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
     );
   }
 
-  if (history?.length === 0) {
+  if (hasEmptyChatHistory) {
     return (
       <SidebarGroup>
         <SidebarGroupContent>
@@ -246,52 +201,23 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
     );
   }
 
-  const groupChatsByDate = (chats: Chat[]): GroupedChats => {
-    const now = new Date();
-    const oneWeekAgo = subWeeks(now, 1);
-    const oneMonthAgo = subMonths(now, 1);
-
-    return chats.reduce(
-      (groups, chat) => {
-        const chatDate = new Date(chat.createdAt);
-
-        if (isToday(chatDate)) {
-          groups.today.push(chat);
-        } else if (isYesterday(chatDate)) {
-          groups.yesterday.push(chat);
-        } else if (chatDate > oneWeekAgo) {
-          groups.lastWeek.push(chat);
-        } else if (chatDate > oneMonthAgo) {
-          groups.lastMonth.push(chat);
-        } else {
-          groups.older.push(chat);
-        }
-
-        return groups;
-      },
-      {
-        today: [],
-        yesterday: [],
-        lastWeek: [],
-        lastMonth: [],
-        older: [],
-      } as GroupedChats,
-    );
-  };
-
   return (
     <>
       <SidebarGroup>
         <SidebarGroupContent>
           <SidebarMenu>
-            {history &&
+            {paginatedChatHistories &&
               (() => {
-                const groupedChats = groupChatsByDate(history);
+                const chatsFromHistory = paginatedChatHistories.flatMap(
+                  (paginatedChatHistory) => paginatedChatHistory.chats,
+                );
+
+                const groupedChats = groupChatsByDate(chatsFromHistory);
 
                 return (
-                  <>
+                  <div className="flex flex-col gap-6">
                     {groupedChats.today.length > 0 && (
-                      <>
+                      <div>
                         <div className="px-2 py-1 text-xs text-sidebar-foreground/50">
                           Today
                         </div>
@@ -307,12 +233,12 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
                             setOpenMobile={setOpenMobile}
                           />
                         ))}
-                      </>
+                      </div>
                     )}
 
                     {groupedChats.yesterday.length > 0 && (
-                      <>
+                      <div>
-                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50 mt-6">
+                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50">
                           Yesterday
                         </div>
                         {groupedChats.yesterday.map((chat) => (
@@ -327,12 +253,12 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
                             setOpenMobile={setOpenMobile}
                           />
                         ))}
-                      </>
+                      </div>
                     )}
 
                     {groupedChats.lastWeek.length > 0 && (
-                      <>
+                      <div>
-                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50 mt-6">
+                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50">
                           Last 7 days
                         </div>
                         {groupedChats.lastWeek.map((chat) => (
@@ -347,12 +273,12 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
                             setOpenMobile={setOpenMobile}
                           />
                         ))}
-                      </>
+                      </div>
                     )}
 
                     {groupedChats.lastMonth.length > 0 && (
-                      <>
+                      <div>
-                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50 mt-6">
+                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50">
                           Last 30 days
                         </div>
                         {groupedChats.lastMonth.map((chat) => (
@@ -367,13 +293,13 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
                             setOpenMobile={setOpenMobile}
                           />
                         ))}
-                      </>
+                      </div>
                     )}
 
                     {groupedChats.older.length > 0 && (
-                      <>
+                      <div>
-                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50 mt-6">
+                        <div className="px-2 py-1 text-xs text-sidebar-foreground/50">
-                          Older
+                          Older than last month
                         </div>
                         {groupedChats.older.map((chat) => (
                           <ChatItem
@@ -387,14 +313,36 @@ export function SidebarHistory({ user }: { user: User | undefined }) {
                             setOpenMobile={setOpenMobile}
                           />
                         ))}
-                      </>
+                      </div>
                     )}
-                  </>
+                  </div>
                 );
               })()}
           </SidebarMenu>
+
+          <motion.div
+            onViewportEnter={() => {
+              if (!isValidating && !hasReachedEnd) {
+                setSize((size) => size + 1);
+              }
+            }}
+          />
+
+          {hasReachedEnd ? (
+            <div className="px-2 text-zinc-500 w-full flex flex-row justify-center items-center text-sm gap-2 mt-8">
+              You have reached the end of your chat history.
+            </div>
+          ) : (
+            <div className="p-2 text-zinc-500 dark:text-zinc-400 flex flex-row gap-2 items-center mt-8">
+              <div className="animate-spin">
+                <LoaderIcon />
+              </div>
+              <div>Loading Chats...</div>
+            </div>
+          )}
         </SidebarGroupContent>
       </SidebarGroup>
+
       <AlertDialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
         <AlertDialogContent>
           <AlertDialogHeader>

hooks/use-chat-visibility.ts

@@ -1,10 +1,14 @@
 'use client';
 
-import { updateChatVisibility } from '@/app/(chat)/actions';
-import { VisibilityType } from '@/components/visibility-selector';
-import { Chat } from '@/lib/db/schema';
 import { useMemo } from 'react';
 import useSWR, { useSWRConfig } from 'swr';
+import { unstable_serialize } from 'swr/infinite';
+import { updateChatVisibility } from '@/app/(chat)/actions';
+import {
+  getChatHistoryPaginationKey,
+  type ChatHistory,
+} from '@/components/sidebar-history';
+import type { VisibilityType } from '@/components/visibility-selector';
 
 export function useChatVisibility({
   chatId,
@@ -14,7 +18,7 @@ export function useChatVisibility({
   initialVisibility: VisibilityType;
 }) {
   const { mutate, cache } = useSWRConfig();
-  const history: Array<Chat> = cache.get('/api/history')?.data;
+  const history: ChatHistory = cache.get('/api/history')?.data;
 
   const { data: localVisibility, mutate: setLocalVisibility } = useSWR(
     `${chatId}-visibility`,
@@ -26,31 +30,14 @@ export function useChatVisibility({
 
   const visibilityType = useMemo(() => {
     if (!history) return localVisibility;
-    const chat = history.find((chat) => chat.id === chatId);
+    const chat = history.chats.find((chat) => chat.id === chatId);
     if (!chat) return 'private';
     return chat.visibility;
   }, [history, chatId, localVisibility]);
 
   const setVisibilityType = (updatedVisibilityType: VisibilityType) => {
     setLocalVisibility(updatedVisibilityType);
-
+    mutate(unstable_serialize(getChatHistoryPaginationKey));
-    mutate<Array<Chat>>(
-      '/api/history',
-      (history) => {
-        return history
-          ? history.map((chat) => {
-              if (chat.id === chatId) {
-                return {
-                  ...chat,
-                  visibility: updatedVisibilityType,
-                };
-              }
-              return chat;
-            })
-          : [];
-      },
-      { revalidate: false },
-    );
 
     updateChatVisibility({
       chatId: chatId,

lib/db/queries.ts

@@ -1,7 +1,7 @@
 import 'server-only';
 
 import { genSaltSync, hashSync } from 'bcrypt-ts';
-import { and, asc, desc, eq, gt, gte, inArray } from 'drizzle-orm';
+import { and, asc, desc, eq, gt, gte, inArray, lt, SQL } from 'drizzle-orm';
 import { drizzle } from 'drizzle-orm/postgres-js';
 import postgres from 'postgres';
 
@@ -15,6 +15,7 @@ import {
   message,
   vote,
   type DBMessage,
+  Chat,
 } from './schema';
 import { ArtifactKind } from '@/components/artifact';
 
@@ -81,13 +82,68 @@ export async function deleteChatById({ id }: { id: string }) {
   }
 }
 
-export async function getChatsByUserId({ id }: { id: string }) {
+export async function getChatsByUserId({
+  id,
+  limit,
+  startingAfter,
+  endingBefore,
+}: {
+  id: string;
+  limit: number;
+  startingAfter: string | null;
+  endingBefore: string | null;
+}) {
   try {
-    return await db
+    const extendedLimit = limit + 1;
+
+    const query = (whereCondition?: SQL<any>) =>
+      db
         .select()
         .from(chat)
-      .where(eq(chat.userId, id))
+        .where(
-      .orderBy(desc(chat.createdAt));
+          whereCondition
+            ? and(whereCondition, eq(chat.userId, id))
+            : eq(chat.userId, id),
+        )
+        .orderBy(desc(chat.createdAt))
+        .limit(extendedLimit);
+
+    let filteredChats: Array<Chat> = [];
+
+    if (startingAfter) {
+      const [selectedChat] = await db
+        .select()
+        .from(chat)
+        .where(eq(chat.id, startingAfter))
+        .limit(1);
+
+      if (!selectedChat) {
+        throw new Error(`Chat with id ${startingAfter} not found`);
+      }
+
+      filteredChats = await query(gt(chat.createdAt, selectedChat.createdAt));
+    } else if (endingBefore) {
+      const [selectedChat] = await db
+        .select()
+        .from(chat)
+        .where(eq(chat.id, endingBefore))
+        .limit(1);
+
+      if (!selectedChat) {
+        throw new Error(`Chat with id ${endingBefore} not found`);
+      }
+
+      filteredChats = await query(lt(chat.createdAt, selectedChat.createdAt));
+    } else {
+      filteredChats = await query();
+    }
+
+    const hasMore = filteredChats.length > limit;
+
+    return {
+      chats: hasMore ? filteredChats.slice(0, limit) : filteredChats,
+      hasMore,
+    };
   } catch (error) {
     console.error('Failed to get chats by user from database');
     throw error;