Update README.md

Author: BaseMax

README.md

@@ -78,6 +78,22 @@ The following endpoints are available in the API:
 The application uses a PostgreSQL database with the following schema:
 
 ```sql
+CREATE TABLE IF NOT EXISTS users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) NOT NULL,
+    email VARCHAR(255) NOT NULL,
+    password VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS posts (
+    id SERIAL PRIMARY KEY,
+    title VARCHAR(255) NOT NULL,
+    content TEXT NOT NULL,
+    author_id INT NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMP
+);
 ```
 
 ## Dependencies