From 06ae17e6c66d1fabd2797a0b995ccb57090cb880 Mon Sep 17 00:00:00 2001
From: Yashaswini K P <yashaswinikpyashu@gmail.com>
Date: Mon, 1 Jun 2026 12:04:02 +0530
Subject: [PATCH 01/10] feat: add student history API endpoint

---
 package.json |  3 +-
 server.js    | 79 ++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 73 insertions(+), 9 deletions(-)

diff --git a/package.json b/package.json
index f27df097..6160d11e 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "dev": "node ./server.js"
+  "start": "node index.js",
+  "dev": "nodemon index.js"
   },
   "repository": {
     "type": "git",
diff --git a/server.js b/server.js
index ea2087f2..8b1ca667 100644
--- a/server.js
+++ b/server.js
@@ -1,37 +1,100 @@
 const express = require("express");
 const cors = require("cors");
-const path = require("path");
-const fs = require("fs");
+
 const app = express();
 const PORT = process.env.PORT || 3000;
 
 app.use(cors());
-app.use(express.static(path.join(__dirname, "frontend")));
+app.use(express.static("frontend"));
 
+/* ---------------- HOME ROUTES ---------------- */
 app.get("/", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "index.html"));
+  res.sendFile(__dirname + "/frontend/index.html");
 });
 
 app.get("/leaderboard", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "leaderboard.html"));
+  res.sendFile(__dirname + "/frontend/leaderboard.html");
 });
 
 app.get("/about", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "about.html"));
+  res.sendFile(__dirname + "/frontend/about.html");
 });
 
 app.get("/registration", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "registration.html"));
+  res.sendFile(__dirname + "/frontend/registration.html");
 });
 
 app.get("/uptime", (req, res) => {
   res.json({ status: "Website is running ✅" });
 });
 
+/* ---------------- API: STUDENT HISTORY ---------------- */
+app.get("/api/student/:username", async (req, res) => {
+  const { username } = req.params;
+
+  try {
+    console.log("Fetching history for:", username);
+
+    // 1. Get list of all daily files from GitHub repo
+    const apiURL =
+  "https://api.github.com/repos/codepvg/leetcode-ranking-data/contents/daily?ref=main";
+
+    const response = await fetch(apiURL);
+    const files = await response.json();
+
+
+    if (!Array.isArray(files)) {
+      return res.status(500).json({
+        error: "GitHub API failed",
+        details: files.message || files,
+      });
+    }
+
+    let history = [];
+
+    // 2. Loop through each file
+    for (const file of files) {
+      if (!file.name.endsWith(".json")) continue;
+
+      const fileRes = await fetch(file.download_url);
+      const data = await fileRes.json();
+
+      const user = data.find((u) => u.id === username);
+
+      if (user) {
+        const date = file.name.split("-").slice(0, 3).join("-");
+
+        history.push({
+          date,
+          easy: user.data.easySolved,
+          medium: user.data.mediumSolved,
+          hard: user.data.hardSolved,
+        });
+      }
+    }
+
+    // 3. Sort by date
+    history.sort((a, b) => new Date(a.date) - new Date(b.date));
+
+    res.json({
+      username,
+      history,
+    });
+  } catch (err) {
+    console.error(err);
+    res.status(500).json({
+      error: "Failed to fetch student history",
+      details: err.message,
+    });
+  }
+});
+
+/* ---------------- 404 ---------------- */
 app.use((req, res) => {
   res.status(404).send("Page not found");
 });
 
+/* ---------------- START ---------------- */
 app.listen(PORT, () => {
   console.log(`Server running at http://localhost:${PORT}`);
-});
+});
\ No newline at end of file

From 58e568e1f5eda9d7309dc09666248f40077727eb Mon Sep 17 00:00:00 2001
From: Yashaswini K P <yashaswinikpyashu@gmail.com>
Date: Mon, 1 Jun 2026 12:21:33 +0530
Subject: [PATCH 02/10] chore: update files

---
 .github/workflows/format-command.yml   |  4 ++--
 .github/workflows/prettier-check.yml   |  6 +++---
 .github/workflows/stale.yml            | 10 +++++-----
 .github/workflows/sync-leaderboard.yml |  4 ++--
 README.md                              | 21 +++++++++++----------
 package.json                           |  4 ++--
 server.js                              |  5 ++---
 7 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/.github/workflows/format-command.yml b/.github/workflows/format-command.yml
index 60981ea6..d1235234 100644
--- a/.github/workflows/format-command.yml
+++ b/.github/workflows/format-command.yml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   format:
-    name: 'Format code via comment'
+    name: "Format code via comment"
     runs-on: ubuntu-latest
     # Only run if it's a PR and the comment contains /format
     if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/format')
@@ -48,7 +48,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: "20"
 
       - name: Run Prettier
         run: npx prettier --write "frontend/**/*.{html,css,js}" "scripts/**/*.js" "server.js"
diff --git a/.github/workflows/prettier-check.yml b/.github/workflows/prettier-check.yml
index 13688e84..488bbb5b 100644
--- a/.github/workflows/prettier-check.yml
+++ b/.github/workflows/prettier-check.yml
@@ -2,9 +2,9 @@ name: Prettier Check
 
 on:
   pull_request:
-    branches: [ main ]
+    branches: [main]
   push:
-    branches: [ main ]
+    branches: [main]
 
 jobs:
   prettier:
@@ -22,7 +22,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: "20"
 
       - name: Run Prettier Requirements Check
         run: npx prettier --check "frontend/**/*.{html,css,js}" "scripts/**/*.js" "server.js"
diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
index 20296c6c..e66291dd 100644
--- a/.github/workflows/stale.yml
+++ b/.github/workflows/stale.yml
@@ -2,7 +2,7 @@ name: Mark stale issues and PRs
 
 on:
   schedule:
-    - cron: '0 0 * * *'
+    - cron: "0 0 * * *"
 
 jobs:
   stale:
@@ -14,9 +14,9 @@ jobs:
       - uses: actions/stale@v9
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-          stale-issue-message: 'This issue has been inactive for 14 days and has been marked as stale. To keep this issue open, please leave a comment.'
-          stale-pr-message: 'This PR has been inactive for 14 days and has been marked as stale. If you are still working on it, please leave a comment.'
-          stale-issue-label: 'stale'
-          stale-pr-label: 'stale'
+          stale-issue-message: "This issue has been inactive for 14 days and has been marked as stale. To keep this issue open, please leave a comment."
+          stale-pr-message: "This PR has been inactive for 14 days and has been marked as stale. If you are still working on it, please leave a comment."
+          stale-issue-label: "stale"
+          stale-pr-label: "stale"
           days-before-stale: 14
           days-before-close: 5
diff --git a/.github/workflows/sync-leaderboard.yml b/.github/workflows/sync-leaderboard.yml
index 08622c2f..c2ca5952 100644
--- a/.github/workflows/sync-leaderboard.yml
+++ b/.github/workflows/sync-leaderboard.yml
@@ -2,7 +2,7 @@ name: Sync Leaderboard Data
 
 on:
   schedule:
-    - cron: '0 */3 * * *'
+    - cron: "0 */3 * * *"
   workflow_dispatch:
 
 concurrency:
@@ -30,7 +30,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: "20"
 
       - name: Install dependencies
         run: npm install
diff --git a/README.md b/README.md
index 5bd6a63b..73d3ef6e 100644
--- a/README.md
+++ b/README.md
@@ -10,9 +10,9 @@ It allows users to register with their LeetCode username and automatically fetch
 
 The goal of this project is to:
 
-- Encourage consistent problem-solving among students  
-- Create a competitive yet motivating environment  
-- Provide visibility into individual coding progress  
+- Encourage consistent problem-solving among students
+- Create a competitive yet motivating environment
+- Provide visibility into individual coding progress
 
 ---
 
@@ -46,6 +46,7 @@ leetcode-ranking/
 ### 1. Fork and clone the repository
 
 First, fork the repository to your GitHub account. Then clone it locally:
+
 ```bash
 git clone https://github.com/YOUR-USERNAME/leetcode-ranking.git
 cd leetcode-ranking
@@ -63,9 +64,9 @@ or
 
 ## Usage
 
-1. Open the registration page  
-2. Enter your name and LeetCode username  
-3. Submit the form  
+1. Open the registration page
+2. Enter your name and LeetCode username
+3. Submit the form
 4. View your ranking on the leaderboard after the next sync
 
 ---
@@ -74,7 +75,7 @@ or
 
 Contributions are welcome.
 
-- Fork the repository  
-- Create a new branch  
-- Make your changes  
-- Submit a Pull Request  
+- Fork the repository
+- Create a new branch
+- Make your changes
+- Submit a Pull Request
diff --git a/package.json b/package.json
index 6160d11e..fb91ac52 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-  "start": "node index.js",
-  "dev": "nodemon index.js"
+    "start": "node index.js",
+    "dev": "nodemon index.js"
   },
   "repository": {
     "type": "git",
diff --git a/server.js b/server.js
index 8b1ca667..2de5b401 100644
--- a/server.js
+++ b/server.js
@@ -37,12 +37,11 @@ app.get("/api/student/:username", async (req, res) => {
 
     // 1. Get list of all daily files from GitHub repo
     const apiURL =
-  "https://api.github.com/repos/codepvg/leetcode-ranking-data/contents/daily?ref=main";
+      "https://api.github.com/repos/codepvg/leetcode-ranking-data/contents/daily?ref=main";
 
     const response = await fetch(apiURL);
     const files = await response.json();
 
-
     if (!Array.isArray(files)) {
       return res.status(500).json({
         error: "GitHub API failed",
@@ -97,4 +96,4 @@ app.use((req, res) => {
 /* ---------------- START ---------------- */
 app.listen(PORT, () => {
   console.log(`Server running at http://localhost:${PORT}`);
-});
\ No newline at end of file
+});

From 3d9c27ae1f895164fc452bdf8280edcd660bf943 Mon Sep 17 00:00:00 2001
From: Yashaswini K P <yashaswinikpyashu@gmail.com>
Date: Wed, 3 Jun 2026 10:54:06 +0530
Subject: [PATCH 03/10] refactor: move student history logic to separate module

---
 scripts/fetch-student-history.js | 44 ++++++++++++++++++++++++++
 server.js                        | 53 +++-----------------------------
 2 files changed, 48 insertions(+), 49 deletions(-)
 create mode 100644 scripts/fetch-student-history.js

diff --git a/scripts/fetch-student-history.js b/scripts/fetch-student-history.js
new file mode 100644
index 00000000..93fffd3e
--- /dev/null
+++ b/scripts/fetch-student-history.js
@@ -0,0 +1,44 @@
+async function fetchStudentHistory(username) {
+  console.log("Fetching history for:", username);
+
+  const apiURL =
+    "https://api.github.com/repos/codepvg/leetcode-ranking-data/contents/daily?ref=main";
+
+  const response = await fetch(apiURL);
+  const files = await response.json();
+
+  if (!Array.isArray(files)) {
+    throw new Error(files.message || "GitHub API failed");
+  }
+
+  let history = [];
+
+  for (const file of files) {
+    if (!file.name.endsWith(".json")) continue;
+
+    const fileRes = await fetch(file.download_url);
+    const data = await fileRes.json();
+
+    const user = data.find((u) => u.id === username);
+
+    if (user) {
+      const date = file.name.split("-").slice(0, 3).join("-");
+
+      history.push({
+        date,
+        easy: user.data.easySolved,
+        medium: user.data.mediumSolved,
+        hard: user.data.hardSolved,
+      });
+    }
+  }
+
+  history.sort((a, b) => new Date(a.date) - new Date(b.date));
+
+  return {
+    username,
+    history,
+  };
+}
+
+module.exports = fetchStudentHistory;
\ No newline at end of file
diff --git a/server.js b/server.js
index 2de5b401..ea898d1c 100644
--- a/server.js
+++ b/server.js
@@ -4,6 +4,8 @@ const cors = require("cors");
 const app = express();
 const PORT = process.env.PORT || 3000;
 
+const fetchStudentHistory = require("./scripts/fetch-student-history");
+
 app.use(cors());
 app.use(express.static("frontend"));
 
@@ -30,57 +32,10 @@ app.get("/uptime", (req, res) => {
 
 /* ---------------- API: STUDENT HISTORY ---------------- */
 app.get("/api/student/:username", async (req, res) => {
-  const { username } = req.params;
-
   try {
-    console.log("Fetching history for:", username);
-
-    // 1. Get list of all daily files from GitHub repo
-    const apiURL =
-      "https://api.github.com/repos/codepvg/leetcode-ranking-data/contents/daily?ref=main";
-
-    const response = await fetch(apiURL);
-    const files = await response.json();
-
-    if (!Array.isArray(files)) {
-      return res.status(500).json({
-        error: "GitHub API failed",
-        details: files.message || files,
-      });
-    }
-
-    let history = [];
-
-    // 2. Loop through each file
-    for (const file of files) {
-      if (!file.name.endsWith(".json")) continue;
-
-      const fileRes = await fetch(file.download_url);
-      const data = await fileRes.json();
-
-      const user = data.find((u) => u.id === username);
-
-      if (user) {
-        const date = file.name.split("-").slice(0, 3).join("-");
-
-        history.push({
-          date,
-          easy: user.data.easySolved,
-          medium: user.data.mediumSolved,
-          hard: user.data.hardSolved,
-        });
-      }
-    }
-
-    // 3. Sort by date
-    history.sort((a, b) => new Date(a.date) - new Date(b.date));
-
-    res.json({
-      username,
-      history,
-    });
+    const data = await fetchStudentHistory(req.params.username);
+    res.json(data);
   } catch (err) {
-    console.error(err);
     res.status(500).json({
       error: "Failed to fetch student history",
       details: err.message,

From c0ea29d0f836b9b964e5037c6b97e95e8993f1a7 Mon Sep 17 00:00:00 2001
From: Yashaswini K P <yashaswinikpyashu@gmail.com>
Date: Wed, 3 Jun 2026 10:59:01 +0530
Subject: [PATCH 04/10] style: format student history module

---
 scripts/fetch-student-history.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/fetch-student-history.js b/scripts/fetch-student-history.js
index 93fffd3e..85f00c48 100644
--- a/scripts/fetch-student-history.js
+++ b/scripts/fetch-student-history.js
@@ -41,4 +41,4 @@ async function fetchStudentHistory(username) {
   };
 }
 
-module.exports = fetchStudentHistory;
\ No newline at end of file
+module.exports = fetchStudentHistory;

From c9f2896176d3b21e77e4d92131f670ace5865d9a Mon Sep 17 00:00:00 2001
From: Yashaswini K P <yashaswinikpyashu@gmail.com>
Date: Wed, 3 Jun 2026 20:13:26 +0530
Subject: [PATCH 05/10] changing the file name and removing comments

---
 ...{fetch-student-history.js => fetch-student-info.js} |  0
 server.js                                              | 10 +++++-----
 2 files changed, 5 insertions(+), 5 deletions(-)
 rename scripts/{fetch-student-history.js => fetch-student-info.js} (100%)

diff --git a/scripts/fetch-student-history.js b/scripts/fetch-student-info.js
similarity index 100%
rename from scripts/fetch-student-history.js
rename to scripts/fetch-student-info.js
diff --git a/server.js b/server.js
index ea898d1c..10405ac0 100644
--- a/server.js
+++ b/server.js
@@ -3,8 +3,9 @@ const cors = require("cors");
 
 const app = express();
 const PORT = process.env.PORT || 3000;
+const path = require("path");
 
-const fetchStudentHistory = require("./scripts/fetch-student-history");
+const fetchStudentHistory = require("./scripts/fetch-student-info");
 
 app.use(cors());
 app.use(express.static("frontend"));
@@ -30,25 +31,24 @@ app.get("/uptime", (req, res) => {
   res.json({ status: "Website is running ✅" });
 });
 
-/* ---------------- API: STUDENT HISTORY ---------------- */
+
 app.get("/api/student/:username", async (req, res) => {
   try {
     const data = await fetchStudentHistory(req.params.username);
     res.json(data);
   } catch (err) {
     res.status(500).json({
-      error: "Failed to fetch student history",
+      error: "Failed to fetch student details",
       details: err.message,
     });
   }
 });
 
-/* ---------------- 404 ---------------- */
 app.use((req, res) => {
   res.status(404).send("Page not found");
 });
 
-/* ---------------- START ---------------- */
+
 app.listen(PORT, () => {
   console.log(`Server running at http://localhost:${PORT}`);
 });

From 78fbf351a6886153e33f6b35bffbb7bfe7cd6667 Mon Sep 17 00:00:00 2001
From: Yashaswini K P <yashaswinikpyashu@gmail.com>
Date: Wed, 3 Jun 2026 20:34:14 +0530
Subject: [PATCH 06/10] style: apply prettier formatting

---
 CODE_OF_CONDUCT.md | 23 +++++++++++------------
 README.md          |  7 ++-----
 server.js          |  2 --
 3 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index 9767a1e2..1307ce7b 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -17,23 +17,23 @@ diverse, inclusive, and healthy community.
 Examples of behavior that contributes to a positive environment for our
 community include:
 
-* Demonstrating empathy and kindness toward other people
-* Being respectful of differing opinions, viewpoints, and experiences
-* Giving and gracefully accepting constructive feedback
-* Accepting responsibility and apologizing to those affected by our mistakes,
+- Demonstrating empathy and kindness toward other people
+- Being respectful of differing opinions, viewpoints, and experiences
+- Giving and gracefully accepting constructive feedback
+- Accepting responsibility and apologizing to those affected by our mistakes,
   and learning from the experience
-* Focusing on what is best not just for us as individuals, but for the
+- Focusing on what is best not just for us as individuals, but for the
   overall community
 
 Examples of unacceptable behavior include:
 
-* The use of sexualized language or imagery, and sexual attention or
+- The use of sexualized language or imagery, and sexual attention or
   advances of any kind
-* Trolling, insulting or derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or email
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or email
   address, without their explicit permission
-* Other conduct which could reasonably be considered inappropriate in a
+- Other conduct which could reasonably be considered inappropriate in a
   professional setting
 
 ## Enforcement Responsibilities
@@ -106,7 +106,7 @@ Violating these terms may lead to a permanent ban.
 ### 4. Permanent Ban
 
 **Community Impact**: Demonstrating a pattern of violation of community
-standards, including sustained inappropriate behavior,  harassment of an
+standards, including sustained inappropriate behavior, harassment of an
 individual, or aggression toward or disparagement of classes of individuals.
 
 **Consequence**: A permanent ban from any sort of public interaction within
@@ -126,4 +126,3 @@ enforcement ladder](https://github.com/mozilla/diversity).
 For answers to common questions about this code of conduct, see the FAQ at
 https://www.contributor-covenant.org/faq. Translations are available at
 https://www.contributor-covenant.org/translations.
-
diff --git a/README.md b/README.md
index f5560a08..ff3f1186 100644
--- a/README.md
+++ b/README.md
@@ -16,10 +16,10 @@ The goal of this project is to:
 
 ---
 
-
-
 ## Screenshots
+
 A quick preview of the platform UI. The appearance may evolve as the project develops.
+
 ### Home Page
 
 ![Home Page](assets/home-page.png)
@@ -28,13 +28,10 @@ A quick preview of the platform UI. The appearance may evolve as the project dev
 
 ![Registration](assets/registration-page.png)
 
-
 ### Leaderboard
 
 ![Leaderboard](assets/leaderboard.png)
 
-
-
 ## Related Repositories
 
 - [leetcode-ranking-data](https://github.com/codepvg/leetcode-ranking-data) – The database repository where raw JSON data and historical stats are stored
diff --git a/server.js b/server.js
index 10405ac0..8ef52c71 100644
--- a/server.js
+++ b/server.js
@@ -31,7 +31,6 @@ app.get("/uptime", (req, res) => {
   res.json({ status: "Website is running ✅" });
 });
 
-
 app.get("/api/student/:username", async (req, res) => {
   try {
     const data = await fetchStudentHistory(req.params.username);
@@ -48,7 +47,6 @@ app.use((req, res) => {
   res.status(404).send("Page not found");
 });
 
-
 app.listen(PORT, () => {
   console.log(`Server running at http://localhost:${PORT}`);
 });

From 571827199933810fdd4711490396abc5ed00ccac Mon Sep 17 00:00:00 2001
From: Yashaswini K P <yashaswinikpyashu@gmail.com>
Date: Wed, 3 Jun 2026 20:47:10 +0530
Subject: [PATCH 07/10] message

---
 server.js | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/server.js b/server.js
index 8ef52c71..5c78ee92 100644
--- a/server.js
+++ b/server.js
@@ -1,30 +1,30 @@
 const express = require("express");
 const cors = require("cors");
+const path = require("path");
 
 const app = express();
 const PORT = process.env.PORT || 3000;
-const path = require("path");
 
 const fetchStudentHistory = require("./scripts/fetch-student-info");
 
 app.use(cors());
-app.use(express.static("frontend"));
+app.use(express.static(path.join(__dirname, "frontend")));
 
 /* ---------------- HOME ROUTES ---------------- */
 app.get("/", (req, res) => {
-  res.sendFile(__dirname + "/frontend/index.html");
+  res.sendFile(path.join(__dirname, "frontend", "index.html"));
 });
 
 app.get("/leaderboard", (req, res) => {
-  res.sendFile(__dirname + "/frontend/leaderboard.html");
+  res.sendFile(path.join(__dirname, "frontend", "leaderboard.html"));
 });
 
 app.get("/about", (req, res) => {
-  res.sendFile(__dirname + "/frontend/about.html");
+  res.sendFile(path.join(__dirname, "frontend", "about.html"));
 });
 
 app.get("/registration", (req, res) => {
-  res.sendFile(__dirname + "/frontend/registration.html");
+  res.sendFile(path.join(__dirname, "frontend", "registration.html"));
 });
 
 app.get("/uptime", (req, res) => {

From 25154e75484e427530ce91368f75d91c685b0e95 Mon Sep 17 00:00:00 2001
From: Jagdish Prajapati <jagadishdrp@gmail.com>
Date: Wed, 3 Jun 2026 22:48:22 +0530
Subject: [PATCH 08/10] improve user history API response time

---
 scripts/fetch-student-info.js | 87 ++++++++++++++++++++++++++---------
 1 file changed, 66 insertions(+), 21 deletions(-)

diff --git a/scripts/fetch-student-info.js b/scripts/fetch-student-info.js
index 85f00c48..4eee1465 100644
--- a/scripts/fetch-student-info.js
+++ b/scripts/fetch-student-info.js
@@ -1,35 +1,80 @@
+function getFileName(daysAgo) {
+  const now = new Date();
+  now.setDate(now.getDate() - daysAgo);
+
+  const year = now.getFullYear();
+  const month = String(now.getMonth() + 1).padStart(2, "0");
+  const date = String(now.getDate()).padStart(2, "0");
+  let day = now.getDay();
+  day = day === 0 ? 7 : day;
+
+  return `${year}-${month}-${date}-${day}.json`;
+}
+
 async function fetchStudentHistory(username) {
   console.log("Fetching history for:", username);
 
-  const apiURL =
-    "https://api.github.com/repos/codepvg/leetcode-ranking-data/contents/daily?ref=main";
+  let history = [];
+  let missingFilesCount = 0;
+  const maxDays = 365;
+  const chunkSize = 100;
 
-  const response = await fetch(apiURL);
-  const files = await response.json();
+  let done = false;
 
-  if (!Array.isArray(files)) {
-    throw new Error(files.message || "GitHub API failed");
-  }
+  for (let chunkStart = 0; chunkStart < maxDays; chunkStart += chunkSize) {
+    if (done) break;
 
-  let history = [];
+    const fetchPromises = [];
+    const chunkEnd = Math.min(chunkStart + chunkSize, maxDays);
+
+    for (let daysAgo = chunkStart; daysAgo < chunkEnd; daysAgo++) {
+      const fileName = getFileName(daysAgo);
+      const rawUrl = `https://raw.githubusercontent.com/codepvg/leetcode-ranking-data/main/daily/${fileName}`;
+
+      const p = fetch(rawUrl)
+        .then(async (res) => {
+          if (!res.ok) {
+            return { daysAgo, fileName, ok: false };
+          }
+          const data = await res.json();
+          return { daysAgo, fileName, ok: true, data };
+        })
+        .catch((err) => {
+          return { daysAgo, fileName, ok: false, error: err };
+        });
+
+      fetchPromises.push(p);
+    }
+
+    const results = await Promise.all(fetchPromises);
 
-  for (const file of files) {
-    if (!file.name.endsWith(".json")) continue;
+    for (const result of results) {
+      if (!result.ok) {
+        missingFilesCount++;
+        if (missingFilesCount >= 7) {
+          done = true;
+          break;
+        }
+        continue;
+      }
 
-    const fileRes = await fetch(file.download_url);
-    const data = await fileRes.json();
+      missingFilesCount = 0;
 
-    const user = data.find((u) => u.id === username);
+      const user = result.data.find((u) => u.id === username);
 
-    if (user) {
-      const date = file.name.split("-").slice(0, 3).join("-");
+      if (user) {
+        const dateStr = result.fileName.split("-").slice(0, 3).join("-");
 
-      history.push({
-        date,
-        easy: user.data.easySolved,
-        medium: user.data.mediumSolved,
-        hard: user.data.hardSolved,
-      });
+        history.push({
+          date: dateStr,
+          easy: user.data.easySolved,
+          medium: user.data.mediumSolved,
+          hard: user.data.hardSolved,
+        });
+      } else {
+        done = true;
+        break;
+      }
     }
   }
 

From 943ef4494f117f48c0ecbe51938bfa2160c9b0c6 Mon Sep 17 00:00:00 2001
From: Jagdish Prajapati <jagadishdrp@gmail.com>
Date: Wed, 3 Jun 2026 22:56:42 +0530
Subject: [PATCH 09/10] Change main entry point from index.js to server.js

---
 package.json | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package.json b/package.json
index 23078d0f..25079eb8 100644
--- a/package.json
+++ b/package.json
@@ -2,10 +2,10 @@
   "name": "leetcode-ranking",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "server.js",
   "scripts": {
-    "start": "node index.js",
-    "dev": "nodemon index.js"
+    "start": "node server.js",
+    "dev": "nodemon server.js"
   },
   "repository": {
     "type": "git",

From db5465e5a2028ec67fb5b543736ac39c584d9576 Mon Sep 17 00:00:00 2001
From: Jagdish Prajapati <jagadishdrp@gmail.com>
Date: Wed, 3 Jun 2026 23:04:32 +0530
Subject: [PATCH 10/10] Add caching for student API endpoint

Implement caching for student data retrieval to improve performance.
---
 server.js | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/server.js b/server.js
index 5c78ee92..298ff019 100644
--- a/server.js
+++ b/server.js
@@ -31,9 +31,23 @@ app.get("/uptime", (req, res) => {
   res.json({ status: "Website is running ✅" });
 });
 
+const studentCache = new Map();
+
 app.get("/api/student/:username", async (req, res) => {
+  const username = req.params.username;
+
+  if (studentCache.has(username)) {
+    const cached = studentCache.get(username);
+    if (Date.now() - cached.timestamp < 5 * 60 * 1000) {
+      return res.json(cached.data);
+    }
+  }
+
   try {
-    const data = await fetchStudentHistory(req.params.username);
+    const data = await fetchStudentHistory(username);
+
+    studentCache.set(username, { timestamp: Date.now(), data });
+
     res.json(data);
   } catch (err) {
     res.status(500).json({