feat: update schema to include posts and comments

db/schema.sql

@@ -5,3 +5,31 @@ CREATE TABLE users (
     password_hash VARCHAR(255) NOT NULL,
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 );
+
+CREATE TABLE has_access (
+    id SERIAL PRIMARY KEY,
+    user_id INTEGER NOT NULL,
+    post_id INTEGER NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+    FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE
+);
+
+CREATE TABLE posts (
+    id SERIAL PRIMARY KEY,
+    author VARCHAR(255) NOT NULL,
+    title VARCHAR(255) NOT NULL,
+    content TEXT NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    source VARCHAR(255) NOT NULL
+);
+
+CREATE TABLE comments (
+    id SERIAL PRIMARY KEY,
+    post_id INTEGER NOT NULL,
+    author VARCHAR(255) NOT NULL,
+    content TEXT NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    reply_to VARCHAR(255),
+    source VARCHAR(255) NOT NULL,
+    FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE
+);