CREATE TABLE customer_tokens (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    customer_id UUID NOT NULL,
    token_type VARCHAR(50) NOT NULL,
    balance BIGINT DEFAULT 0 NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    CONSTRAINT fk_customer_tokens_customer
        FOREIGN KEY (customer_id)
        REFERENCES customers(id)
        ON DELETE CASCADE,
    
    CONSTRAINT chk_customer_tokens_balance_non_negative
        CHECK (balance >= 0),
    
    CONSTRAINT chk_customer_tokens_type_valid
        CHECK (token_type IN ('SPIN', 'RAFFLE', 'MINIGAME'))
);

CREATE INDEX idx_customer_tokens_customer_id ON customer_tokens(customer_id);
CREATE INDEX idx_customer_tokens_token_type ON customer_tokens(token_type);
CREATE INDEX idx_customer_tokens_updated_at ON customer_tokens(updated_at);

CREATE UNIQUE INDEX idx_customer_tokens_unique_customer_type ON customer_tokens(customer_id, token_type);