index added to db, pagination working

backend/prisma/migrations/20250409214100_add_indexes/migration.sql

@@ -0,0 +1,17 @@
+-- DropForeignKey
+ALTER TABLE "Note" DROP CONSTRAINT "Note_userId_fkey";
+
+-- AlterTable
+ALTER TABLE "Note" ALTER COLUMN "userId" DROP NOT NULL;
+
+-- CreateIndex
+CREATE INDEX "Article_url_idx" ON "Article"("url");
+
+-- CreateIndex
+CREATE INDEX "Collection_userId_idx" ON "Collection"("userId");
+
+-- CreateIndex
+CREATE INDEX "QuickNote_collectionId_idx" ON "QuickNote"("collectionId");
+
+-- AddForeignKey
+ALTER TABLE "Note" ADD CONSTRAINT "Note_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE SET NULL ON UPDATE CASCADE;

backend/prisma/migrations/migration_lock.toml

@@ -1,3 +1,3 @@
 # Please do not edit this file manually
 # It should be added in your version-control system (e.g., Git)
-provider = "postgresql"
+provider = "postgresql"

backend/prisma/schema.prisma

@@ -18,6 +18,8 @@ model Collection {
   notes       Note[]
   userId      String
   user        User        @relation(fields: [userId], references: [id])
+
+  @@index([userId])
 }
 
 model Article {
@@ -34,6 +36,8 @@ model Article {
   categories  String[]
   authors     String[]
   Note        Note[]
+
+  @@index([url])
 }
 
 model QuickNote {
@@ -50,6 +54,8 @@ model QuickNote {
   articleId    String?
   createdAt    DateTime   @default(now())
   updatedAt    DateTime   @updatedAt
+
+  @@index([collectionId])
 }
 
 model Note {

backend/src/articles/articles.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Get } from '@nestjs/common';
+import { Controller, Get, Query } from '@nestjs/common';
 import { ArticlesService } from './articles.service';
 
 @Controller('api/articles')
@@ -6,7 +6,18 @@ export class ArticlesController {
   constructor(private readonly articlesService: ArticlesService) {}
 
   @Get()
-  async findAll() {
-    return this.articlesService.findAll();
+  async findAll(
+    @Query('limit') limit?: number,
+    @Query('cursor') cursor?: string,
+  ) {
+    return this.articlesService.findAll(
+      limit ? Number(limit) : undefined,
+      cursor,
+    );
+  }
+
+  @Get('count')
+  async getCount() {
+    return { count: await this.articlesService.count() };
   }
 }

backend/src/articles/articles.service.ts

@@ -1,14 +1,52 @@
 import { Injectable } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
+import { PaginatedArticles } from './types';
 
 @Injectable()
 export class ArticlesService {
   constructor(private prisma: PrismaService) {}
 
-  async findAll() {
-    return this.prisma.article.findMany({
-      orderBy: { publishedAt: 'desc' },
-      take: 100,
+  async findAll(
+    limit: number = 20,
+    cursor?: string,
+  ): Promise<PaginatedArticles> {
+    const articles = await this.prisma.article.findMany({
+      take: limit + 1,
+      skip: cursor ? 1 : 0,
+      cursor: cursor
+        ? {
+            id: cursor,
+          }
+        : undefined,
+      orderBy: [
+        { publishedAt: 'desc' },
+        { id: 'desc' }, // Secondary sort for stability
+      ],
+      select: {
+        id: true,
+        title: true,
+        content: true,
+        source: true,
+        url: true,
+        publishedAt: true,
+        categories: true,
+        authors: true,
+      },
     });
+
+    let nextCursor: string | null = null;
+    if (articles.length > limit) {
+      const nextItem = articles.pop()!;
+      nextCursor = nextItem.id;
+    }
+
+    return {
+      articles,
+      nextCursor,
+    };
+  }
+
+  async count(): Promise<number> {
+    return this.prisma.article.count();
   }
 }

backend/src/articles/types.ts

@@ -0,0 +1,4 @@
+export interface PaginatedArticles {
+  articles: any[];
+  nextCursor: string | null;
+}