fix: Fix partition constraint errors in PostgreSQL and MySQL schemas

[shinnyeonki]

문제 발생

$ uv run generate.py \
  --locale ko \
  --target postgresql \
  --size medium \
  --apply \
  --host localhost \
  --port 5432 \
  --user shopuser \
  --password shoppassword \
  --database shopdb
=== E-commerce Test DB Generator ===
Scale: medium (1.0x)
Period: 2016-01-01 ~ 2025-06-30
Seed: 42
Targets: postgresql

[1/13] Generating categories, suppliers, products...
  Categories: 53, Suppliers: 60, Products: 2800
[2/13] Generating price history...
  Price history: 8466 records
[3/13] Generating product images...
  Images: 7284 records
[4/13] Generating staff...
  Staff: 50
[5/13] Generating customers, addresses...
  Customers: 52300, Addresses: 86153
[6/13] Generating coupons...
  Coupons: 200
[7/13] Generating orders, order items...
  Orders: 387667, Order items: 941728
[8/13] Generating payments...
  Payments: 387667
[9/13] Generating shipping...
  Shipping: 367457
[10/13] Generating reviews...
  Reviews: 88674
[11/13] Generating inventory, carts, coupon usage...
  Inventory: 147774, Carts: 30000/90133 items, Coupons: 1407, Wishlists: 19999
[12/13] Generating customer inquiries/complaints...
  Complaints: 38818
[13/13] Generating returns/exchanges...
  Returns: 11122

[Extra] Generating date dimension, grade history, tags...
  Dates: 3469, Grade history: 103402, Tags: 46/12498
  Views: 3323274, Points: 1436341, Promos: 128/71175, Q&A: 9438

Data generation complete: 7,629,583 total records (368.1s)

Exporting to PostgreSQL...
  -> ./output/postgresql/
  Applying to PostgreSQL shopuser@localhost:5432/shopdb...
  Applying schema...
  [ERROR] PostgreSQL: unique constraint on partitioned table must include all partitioning columns
DETAIL:  UNIQUE constraint on table "orders" lacks column "ordered_at" which is part of the partition key.


Export complete (17.3s)
Total elapsed time: 385.4s

postgresql 및 MySQL 환경에서 파티셔닝된 orders 테이블에 데이터를 주입하거나 스키마를 생성할 때 다음과 같은 에러가 발생합니다.

PostgreSQL: unique constraint on partitioned table must include all partitioning columns
MySQL: A UNIQUE INDEX must include all columns in the table's partitioning function

파티셔닝시 고유 제약 조건(PRIMARY KEY, UNIQUE KEY)에 파티션 키(본 프로젝트에서는 ordered_at)가 포함될 것을 강제하므로
컬럼 레벨의 UNIQUE 제약을 제거하고 테이블 레벨 복합 유니크 제약 추가하였습니다

[civilian7]

감사합니다! 동일한 수정을 36d8d67 커밋에 직접 반영했습니다.

• PostgreSQL: UNIQUE (order_number, ordered_at) 복합 유니크
• MySQL: UNIQUE KEY uq_order_number (order_number, ordered_at) 복합 유니크

파티션 테이블 제약조건 문제를 정확히 짚어주셔서 감사합니다. README 기여자 섹션에도 등록했습니다.