diff --git a/initdb/schema.sql b/initdb/schema.sql
index 802ca77450d8e48191400cb451534013f58d7e04..dde59cf1175b9c54897f17ea8bfe88cfb7787162 100644
--- a/initdb/schema.sql
+++ b/initdb/schema.sql
@@ -20,7 +20,35 @@ CREATE TABLE videos(
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     fileName text NOT NULL,
     PRIMARY KEY(id),
-    FOREIGN KEY (creator_id) REFERENCES users(id)
+    FOREIGN KEY (creator_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+CREATE TABLE comments (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    user_id int NOT NULL,
+    video_id int NOT NULL,
+    content text NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+    FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE
+);
+
+CREATE TABLE reply (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    creator_id int NOT NULL,
+    content text NOT NULL,
+    comment_id int NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (comment_id) REFERENCES comments(id) ON DELETE CASCADE,
+    FOREIGN KEY (creator_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+CREATE TABLE reply_likes(
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    reply_id INT NOT NULL,
+    user_id INT NOT NULL,
+    FOREIGN KEY (reply_id) REFERENCES reply(id) ON DELETE CASCADE,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 );
 CREATE TABLE likes (
     id INT AUTO_INCREMENT PRIMARY KEY,
diff --git a/package-lock.json b/package-lock.json
index 27ce9ac5ad2a363bffa0f1853a69b24312f878a5..96723452868f71daeadac39705cf2f6ffd4ccfbc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -60,6 +60,7 @@
         "@types/react": "^18.3.18",
         "@types/react-dom": "^18.3.5",
         "@vitejs/plugin-react": "^4.3.4",
+        "cross-env": "^7.0.3",
         "eslint": "^9.17.0",
         "eslint-plugin-react-hooks": "^5.0.0",
         "eslint-plugin-react-refresh": "^0.4.16",
@@ -3592,6 +3593,25 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/cross-env": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.3.tgz",
+      "integrity": "sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cross-spawn": "^7.0.1"
+      },
+      "bin": {
+        "cross-env": "src/bin/cross-env.js",
+        "cross-env-shell": "src/bin/cross-env-shell.js"
+      },
+      "engines": {
+        "node": ">=10.14",
+        "npm": ">=6",
+        "yarn": ">=1"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
diff --git a/package.json b/package.json
index 496a026c223d167beabedbd1be8d5bde47756846..2e651ee06926fd8f833bdab862d3469a2d0d65ab 100644
--- a/package.json
+++ b/package.json
@@ -67,6 +67,7 @@
     "@types/react": "^18.3.18",
     "@types/react-dom": "^18.3.5",
     "@vitejs/plugin-react": "^4.3.4",
+    "cross-env": "^7.0.3",
     "eslint": "^9.17.0",
     "eslint-plugin-react-hooks": "^5.0.0",
     "eslint-plugin-react-refresh": "^0.4.16",