-- Notifications table (master notification record)
CREATE TABLE notifications (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    title VARCHAR(255) NOT NULL,
    body TEXT,
    type VARCHAR(100),
    category VARCHAR(100),
    priority VARCHAR(50) NOT NULL DEFAULT 'normal' CHECK (priority IN ('low', 'normal', 'high')),
    image_url VARCHAR(512),
    action_url VARCHAR(512),
    notifiable_type VARCHAR(100),
    notifiable_id UUID,
    data JSONB,
    scheduled_at TIMESTAMP WITH TIME ZONE,
    sent_at TIMESTAMP WITH TIME ZONE,
    expired_at TIMESTAMP WITH TIME ZONE,
    created_by UUID REFERENCES users(id) ON DELETE SET NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Indexes
CREATE INDEX idx_notifications_created_by ON notifications(created_by);
CREATE INDEX idx_notifications_type ON notifications(type);
CREATE INDEX idx_notifications_category ON notifications(category);
CREATE INDEX idx_notifications_notifiable ON notifications(notifiable_type, notifiable_id);
CREATE INDEX idx_notifications_scheduled_at ON notifications(scheduled_at);
CREATE INDEX idx_notifications_sent_at ON notifications(sent_at);