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backend/migrations/033_add_promo_codes.sql

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+-- 创建注册优惠码表
+CREATE TABLE IF NOT EXISTS promo_codes (
+    id BIGSERIAL PRIMARY KEY,
+    code VARCHAR(32) NOT NULL UNIQUE,
+    bonus_amount DECIMAL(20,8) NOT NULL DEFAULT 0,
+    max_uses INT NOT NULL DEFAULT 0,
+    used_count INT NOT NULL DEFAULT 0,
+    status VARCHAR(20) NOT NULL DEFAULT 'active',
+    expires_at TIMESTAMPTZ DEFAULT NULL,
+    notes TEXT DEFAULT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- 创建优惠码使用记录表
+CREATE TABLE IF NOT EXISTS promo_code_usages (
+    id BIGSERIAL PRIMARY KEY,
+    promo_code_id BIGINT NOT NULL REFERENCES promo_codes(id) ON DELETE CASCADE,
+    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    bonus_amount DECIMAL(20,8) NOT NULL,
+    used_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(promo_code_id, user_id)
+);
+
+-- 索引
+CREATE INDEX IF NOT EXISTS idx_promo_codes_status ON promo_codes(status);
+CREATE INDEX IF NOT EXISTS idx_promo_codes_expires_at ON promo_codes(expires_at);
+CREATE INDEX IF NOT EXISTS idx_promo_code_usages_promo_code_id ON promo_code_usages(promo_code_id);
+CREATE INDEX IF NOT EXISTS idx_promo_code_usages_user_id ON promo_code_usages(user_id);
+
+COMMENT ON TABLE promo_codes IS '注册优惠码';
+COMMENT ON TABLE promo_code_usages IS '优惠码使用记录';
+COMMENT ON COLUMN promo_codes.max_uses IS '最大使用次数，0表示无限制';
+COMMENT ON COLUMN promo_codes.status IS '状态: active, disabled';