-- Create devices table
CREATE TABLE IF NOT EXISTS devices (
    id uuid PRIMARY KEY default gen_random_uuid(),
    created_at timestamp NOT NULL default now(),
    created_by uuid NOT NULL,
    updated_at timestamp NOT NULL default now(),
    updated_by uuid NOT NULL,
    fingerprint_hash VARCHAR(64) UNIQUE NOT NULL,
    device_name VARCHAR(255),
    first_seen TIMESTAMP NOT NULL DEFAULT NOW(),
    last_seen TIMESTAMP NOT NULL DEFAULT NOW(),
    user_agent TEXT
);

-- Create indexes for better performance
CREATE INDEX IF NOT EXISTS idx_devices_fingerprint_hash ON devices(fingerprint_hash);
CREATE INDEX IF NOT EXISTS idx_devices_last_seen ON devices(last_seen);

-- Create function to automatically update updated_at timestamp
CREATE OR REPLACE FUNCTION update_updated_at_column()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ language 'plpgsql';

-- Create trigger to automatically update updated_at
DROP TRIGGER IF EXISTS update_devices_updated_at ON devices;
CREATE TRIGGER update_devices_updated_at 
    BEFORE UPDATE ON devices 
    FOR EACH ROW 
    EXECUTE FUNCTION update_updated_at_column();