CREATE TABLE IF NOT EXISTS notifications (
    id BIGSERIAL PRIMARY KEY,
    tenant_id VARCHAR(36) NOT NULL,
    user_id BIGINT NOT NULL,
    title VARCHAR(256) NOT NULL,
    content TEXT,
    type VARCHAR(32) NOT NULL DEFAULT 'info',
    is_read BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_notifications_tenant_id ON notifications(tenant_id);
CREATE INDEX IF NOT EXISTS idx_notifications_user_id ON notifications(user_id);