diff --git a/backend/src/controllers/timetable/deleteTimetable.ts b/backend/src/controllers/timetable/deleteTimetable.ts
index 6a0d1f5f..931506d3 100644
--- a/backend/src/controllers/timetable/deleteTimetable.ts
+++ b/backend/src/controllers/timetable/deleteTimetable.ts
@@ -83,7 +83,7 @@ export const deleteTimetable = async (req: Request, res: Response) => {
       headers: {
         "Content-Type": "application/json",
       },
-      body: JSON.stringify({ id: timetable.id }),
+      body: JSON.stringify({ id: req.params.id }),
     });
     if (!res.ok) {
       const resJson = await res.json();
diff --git a/backend/src/controllers/timetable/searchTimetable.ts b/backend/src/controllers/timetable/searchTimetable.ts
new file mode 100644
index 00000000..6466830a
--- /dev/null
+++ b/backend/src/controllers/timetable/searchTimetable.ts
@@ -0,0 +1,43 @@
+import { Request, Response } from "express";
+import { z } from "zod";
+import { namedNonEmptyStringType } from "../../../../lib/src/zodFieldTypes.js";
+import { env } from "../../config/server.js";
+import { Timetable } from "../../entity/entities.js";
+import { validate } from "../../middleware/zodValidateRequest.js";
+
+const searchTimetableSchema = z.object({
+  query: z.object({
+    query: namedNonEmptyStringType("query"),
+  }),
+});
+
+export const searchTimetableValidator = validate(searchTimetableSchema);
+
+export const searchTimetable = async (req: Request, res: Response) => {
+  try {
+    const { query } = req.query;
+
+    const searchServiceURL = `${env.SEARCH_SERVICE_URL}/timetable/search?query=${query}`;
+
+    const response = await fetch(searchServiceURL, {
+      method: "GET",
+      headers: { "Content-Type": "application/json" },
+    });
+
+    const searchResults = await response.json();
+
+    if (!response.ok) {
+      console.log("Error while searching timetable: ", searchResults.error);
+      return res.status(500).json({ message: "Internal Server Error" });
+    }
+
+    const timetables = searchResults.map(
+      (el: { timetable: Timetable; score: string }) => el.timetable,
+    );
+
+    return res.json(timetables);
+  } catch (err) {
+    console.log(err);
+    return res.status(500).json({ message: "Internal Server Error" });
+  }
+};
diff --git a/backend/src/controllers/timetable/updateChangedTimetable.ts b/backend/src/controllers/timetable/updateChangedTimetable.ts
index fb5f3663..28679bab 100644
--- a/backend/src/controllers/timetable/updateChangedTimetable.ts
+++ b/backend/src/controllers/timetable/updateChangedTimetable.ts
@@ -2,21 +2,26 @@ import type { Request, Response } from "express";
 import { z } from "zod";
 import {
   courseWithSectionsType,
+  namedNonEmptyStringType,
   sectionTypeList,
 } from "../../../../lib/src/index.js";
+import { env } from "../../config/server.js";
 import { AppDataSource } from "../../db.js";
 import { Course, Section, Timetable } from "../../entity/entities.js";
 import { validate } from "../../middleware/zodValidateRequest.js";
+import { timetableRepository } from "../../repositories/timetableRepository.js";
 import { checkForExamTimingsChange } from "../../utils/checkForChange.js";
 import {
   checkForClassHoursClash,
   checkForExamHoursClash,
 } from "../../utils/checkForClashes.js";
+import sqids from "../../utils/sqids.js";
 import { addExamTimings, removeSection } from "../../utils/updateSection.js";
 import { updateSectionWarnings } from "../../utils/updateWarnings.js";
 
 const dataSchema = z.object({
   body: z.object({
+    chronoSecret: namedNonEmptyStringType("chronoSecret"),
     course: courseWithSectionsType,
   }),
 });
@@ -25,6 +30,9 @@ export const updateChangedTimetableValidator = validate(dataSchema);
 
 export const updateChangedTimetable = async (req: Request, res: Response) => {
   try {
+    if (env.CHRONO_SECRET !== req.body.chronoSecret) {
+      return res.status(401).json({ message: "Chrono Secret is incorrect" });
+    }
     // Use a transaction because we will run many dependent mutations
     const queryRunner = AppDataSource.createQueryRunner();
     await queryRunner.connect();
@@ -220,10 +228,107 @@ export const updateChangedTimetable = async (req: Request, res: Response) => {
       console.log("Error while querying for course: ", err.message);
       return res.status(500).json({ message: "Internal Server Error" });
     }
-
     // After everything passes fine, commit the transaction
     await queryRunner.commitTransaction();
     queryRunner.release();
+
+    // update course in search service
+    try {
+      const searchServiceURL = `${env.SEARCH_SERVICE_URL}/course/remove`;
+      const res = await fetch(searchServiceURL, {
+        method: "DELETE",
+        headers: {
+          "Content-Type": "application/json",
+        },
+        body: JSON.stringify({ id: course.id }),
+      });
+      if (!res.ok) {
+        const resJson = await res.json();
+        console.log(resJson.error);
+      }
+    } catch (err: any) {
+      console.log(
+        "Error while removing course from search service: ",
+        err.message,
+      );
+      return res.status(500).json({ message: "Internal Server Error" });
+    }
+
+    try {
+      const searchServiceURL = `${env.SEARCH_SERVICE_URL}/course/add`;
+      const res = await fetch(searchServiceURL, {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json",
+        },
+        body: JSON.stringify(course),
+      });
+      if (!res.ok) {
+        const resJson = await res.json();
+        console.log(resJson.error);
+      }
+    } catch (err: any) {
+      console.log("Error while adding course to search service: ", err.message);
+      return res.status(500).json({ message: "Internal Server Error" });
+    }
+
+    // update timetables in search service
+    for (const timetable of timetables) {
+      try {
+        const searchServiceURL = `${env.SEARCH_SERVICE_URL}/timetable/remove`;
+        const encodedId = sqids.encode([timetable.id]);
+        const res = await fetch(searchServiceURL, {
+          method: "DELETE",
+          headers: {
+            "Content-Type": "application/json",
+          },
+          body: JSON.stringify({ id: encodedId }),
+        });
+
+        if (!res.ok) {
+          const resJson = await res.json();
+          console.log(resJson.error);
+        }
+      } catch (err: any) {
+        console.log(
+          "Error while removing timetable from search service: ",
+          err.message,
+        );
+        return res.status(500).json({ message: "Internal Server Error" });
+      }
+      if (!timetable.draft && !timetable.private) {
+        const timetableWithSections = await timetableRepository
+          .createQueryBuilder("timetable")
+          .leftJoinAndSelect("timetable.sections", "section")
+          .where("timetable.id=:id", { id: timetable.id })
+          .getOne();
+        const encodedId = sqids.encode([timetable.id]);
+        const timetableWithSectionsString = {
+          ...timetableWithSections,
+          id: encodedId,
+        };
+        try {
+          const searchServiceURL = `${env.SEARCH_SERVICE_URL}/timetable/add`;
+          const res = await fetch(searchServiceURL, {
+            method: "POST",
+            headers: {
+              "Content-Type": "application/json",
+            },
+            body: JSON.stringify(timetableWithSectionsString),
+          });
+          if (!res.ok) {
+            const resJson = await res.json();
+            console.log(resJson.error);
+          }
+        } catch (err: any) {
+          console.log(
+            "Error while adding timetable to search service: ",
+            err.message,
+          );
+          return res.status(500).json({ message: "Internal Server Error" });
+        }
+      }
+    }
     return res.json({ message: "Timetable successfully updated" });
   } catch (err: any) {
     console.log(err);
diff --git a/backend/src/routers/timetableRouter.ts b/backend/src/routers/timetableRouter.ts
index f1df5252..e3df6361 100644
--- a/backend/src/routers/timetableRouter.ts
+++ b/backend/src/routers/timetableRouter.ts
@@ -30,6 +30,10 @@ import {
   removeSection,
   removeSectionValidator,
 } from "../controllers/timetable/removeSection.js";
+import {
+  searchTimetable,
+  searchTimetableValidator,
+} from "../controllers/timetable/searchTimetable.js";
 import { authenticate } from "../middleware/auth.js";
 
 const timetableRouter = express.Router();
@@ -41,6 +45,12 @@ timetableRouter.get(
   getPublicTimetablesValidator,
   getPublicTimetables,
 );
+timetableRouter.get(
+  "/search",
+  authenticate,
+  searchTimetableValidator,
+  searchTimetable,
+);
 timetableRouter.get("/:id", getTimetableByIdValidator, getTimetableById);
 timetableRouter.post(
   "/:id/delete",