CREATE TABLE tiers (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(100) NOT NULL UNIQUE,
    min_points BIGINT NOT NULL,
    benefits JSONB DEFAULT '{}',
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    CONSTRAINT chk_tiers_min_points_non_negative
        CHECK (min_points >= 0)
);

CREATE INDEX idx_tiers_min_points ON tiers(min_points);
CREATE INDEX idx_tiers_created_at ON tiers(created_at);