added little worker file to run operations on the database

backend/worker.js

@@ -0,0 +1,75 @@
+const express = require("express");
+const { config } = require("dotenv");
+const path = require("path");
+const MonkeyError = require("./handlers/error");
+config({ path: path.join(__dirname, ".env") });
+
+const cors = require("cors");
+const admin = require("firebase-admin");
+
+const serviceAccount = require("./credentials/serviceAccountKey.json");
+const { connectDB, mongoDB } = require("./init/mongodb");
+
+const PORT = process.env.PORT || 5005;
+
+async function main() {
+  await connectDB();
+  await admin.initializeApp({
+    credential: admin.credential.cert(serviceAccount),
+  });
+  console.log("Database Connected");
+  refactor();
+}
+
+main();
+
+async function refactor() {
+  console.log("getting all users");
+  let users = await mongoDB().collection("users").find({}).toArray();
+  console.log(users.length);
+  for (let user of users) {
+    let obj = user.personalBests;
+
+    lbPb = {
+      time: {
+        15: {},
+        60: {},
+      },
+    };
+    let bestForEveryLanguage = {};
+    if (obj?.time?.[15]) {
+      obj.time[15].forEach((pb) => {
+        if (!bestForEveryLanguage[pb.language]) {
+          bestForEveryLanguage[pb.language] = pb;
+        } else {
+          if (bestForEveryLanguage[pb.language].wpm < pb.wpm) {
+            bestForEveryLanguage[pb.language] = pb;
+          }
+        }
+      });
+      Object.keys(bestForEveryLanguage).forEach((key) => {
+        lbPb.time[15][key] = bestForEveryLanguage[key];
+      });
+      bestForEveryLanguage = {};
+    }
+    if (obj?.time?.[60]) {
+      obj.time[60].forEach((pb) => {
+        if (!bestForEveryLanguage[pb.language]) {
+          bestForEveryLanguage[pb.language] = pb;
+        } else {
+          if (bestForEveryLanguage[pb.language].wpm < pb.wpm) {
+            bestForEveryLanguage[pb.language] = pb;
+          }
+        }
+      });
+      Object.keys(bestForEveryLanguage).forEach((key) => {
+        lbPb.time[60][key] = bestForEveryLanguage[key];
+      });
+    }
+
+    await mongoDB()
+      .collection("users")
+      .updateOne({ _id: user._id }, { $set: { lbPersonalBests: lbPb } });
+    console.log(`updated ${user.name}`);
+  }
+}