Initial commit

backend/migrations/003_users_auth.sql

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+-- Users table for authentication
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    password_hash VARCHAR(255) NOT NULL,
+    full_name VARCHAR(100),
+    email VARCHAR(100),
+    role VARCHAR(20) NOT NULL CHECK (role IN ('admin', 'user')) DEFAULT 'user',
+    is_active BOOLEAN DEFAULT true,
+    last_login TIMESTAMP,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_users_username ON users(username);
+CREATE INDEX idx_users_role ON users(role);
+
+-- Update trigger
+CREATE OR REPLACE FUNCTION update_users_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = CURRENT_TIMESTAMP;
+    RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+CREATE TRIGGER update_users_updated_at
+    BEFORE UPDATE ON users
+    FOR EACH ROW
+    EXECUTE FUNCTION update_users_updated_at();
+
+-- Sessions table
+CREATE TABLE user_sessions (
+    id SERIAL PRIMARY KEY,
+    user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
+    refresh_token VARCHAR(500) NOT NULL,
+    expires_at TIMESTAMP NOT NULL,
+    ip_address VARCHAR(45),
+    user_agent TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_sessions_user_id ON user_sessions(user_id);
+CREATE INDEX idx_sessions_token ON user_sessions(refresh_token);