Fix for knex template migration errors

[roycechua]

Content (작업 내용) 📝

Minor PR for the template created with knex

1. Fix for knex migration error - missing client configuration error
2. Fix for invalid migration file error - must have both an up and down function

Screenshot for work content (작업 내용 스크린샷) 📸

Fixes for the following errors on initial migration from newly generated template using knex

After PR

Links (링크) 🔗

• Issue Links (이슈 링크)

Check List (체크 사항) ✅

• [x] Issue (이슈)
• [x] Tests (테스트)
• [ ] Ready to be merged (병합 준비 완료)
• [ ] Added myself to contributors table (기여자 추가)

[eboujobe]

@ljlm0402 can we please have this PR in?