-- Create verification_tokens table for email verification
CREATE TABLE IF NOT EXISTS verification_tokens (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    token_hash VARCHAR(64) NOT NULL UNIQUE,
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Create indexes for performance
CREATE INDEX IF NOT EXISTS idx_verification_tokens_token_hash ON verification_tokens(token_hash);
CREATE INDEX IF NOT EXISTS idx_verification_tokens_user_id ON verification_tokens(user_id);
CREATE INDEX IF NOT EXISTS idx_verification_tokens_expires_at ON verification_tokens(expires_at);

-- Create function to clean up expired tokens
CREATE OR REPLACE FUNCTION cleanup_expired_verification_tokens()
RETURNS void AS $$
BEGIN
    DELETE FROM verification_tokens WHERE expires_at < NOW();
END;
$$ LANGUAGE plpgsql;