migrate db to store chat history

Author: tknkaa

server/migrations/002_create_tables.sql

@@ -0,0 +1,35 @@
+-- Create users table
+CREATE TABLE IF NOT EXISTS users (
+    id VARCHAR(255) PRIMARY KEY,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    password_hash VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    is_verified BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+-- Create tokens table
+CREATE TABLE IF NOT EXISTS tokens (
+    id VARCHAR(255) PRIMARY KEY,
+    user_id VARCHAR(255) NOT NULL,
+    token VARCHAR(255) UNIQUE NOT NULL,
+    expires_at TIMESTAMP NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT fk_tokens_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Create index on tokens.user_id
+CREATE INDEX IF NOT EXISTS idx_tokens_user_id ON tokens(user_id);
+
+-- Create messages table
+CREATE TABLE IF NOT EXISTS messages (
+    id VARCHAR(255) PRIMARY KEY,
+    user_id VARCHAR(255) NOT NULL,
+    content TEXT NOT NULL,
+    role VARCHAR(50) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT fk_messages_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Create index on messages.user_id
+CREATE INDEX IF NOT EXISTS idx_messages_user_id ON messages(user_id);