CREATE TABLE tickets (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v7(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    subject VARCHAR(255) NOT NULL,
    status VARCHAR(50) NOT NULL DEFAULT 'open', -- open, in_progress, closed
    priority VARCHAR(50) NOT NULL DEFAULT 'medium', -- low, medium, high
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_tickets_user_id ON tickets(user_id);
CREATE INDEX idx_tickets_status ON tickets(status);

CREATE TABLE ticket_messages (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v7(),
    ticket_id UUID NOT NULL REFERENCES tickets(id) ON DELETE CASCADE,
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE, -- Sender
    message TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_ticket_messages_ticket_id ON ticket_messages(ticket_id);