Add Tiers and Game Prize

migrations/000049_create_customer_tokens_table.up.sql

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+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);