Database assistant

Skill AsiaOstrich/universal-dev-standards/skills/database-assistant

Guide database design, migration, and query optimization. Use when: schema design, migration planning, query optimization, index strategy. Not for: application code migration or framework upgrades — use /migrate; the API contract over the data — use /api-design. Keywords: database, schema, migration, SQL, index, query.From its SKILL.md

Install

npx -y skills add AsiaOstrich/universal-dev-standards --skill database-assistant

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SKILL.md

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Database Assistant | 資料庫助手

Guide database design, migration planning, and query optimization.

引導資料庫設計、遷移規劃和查詢最佳化。

Core Principles | 核心原則

Principle	Description	說明
Normalization	Eliminate redundancy (3NF minimum)	消除冗餘（至少 3NF）
Referential Integrity	Enforce FK constraints	強制外鍵約束
Index Strategy	Index query patterns, not all columns	依查詢模式建立索引
Migration Safety	Always reversible, zero-downtime	可逆、零停機
Data Protection	Encrypt sensitive fields, audit access	加密敏感欄位、稽核存取

Schema Design Checklist | Schema 設計檢查清單

Primary keys defined (prefer UUID or BIGINT) | 主鍵已定義
Foreign keys with proper ON DELETE/UPDATE | 外鍵含適當的級聯策略
NOT NULL constraints on required fields | 必填欄位加 NOT NULL
Indexes on frequently queried columns | 常查詢欄位建立索引
Created/Updated timestamps on all tables | 所有表加建立/更新時間戳
Sensitive data encrypted at rest | 敏感資料靜態加密
Naming conventions consistent (snake_case) | 命名慣例一致（snake_case）

Normalization Quick Reference | 正規化快速參考

Normal Form	Rule	規則
1NF	Atomic values, no repeating groups	原子值、無重複群組
2NF	1NF + no partial dependencies	1NF + 無部分相依
3NF	2NF + no transitive dependencies	2NF + 無遞移相依
Denormalize	Only for proven read performance needs	僅針對已證實的讀取效能需求

Migration Workflow | 遷移工作流程

PLAN ──► WRITE ──► TEST ──► DEPLOY ──► VERIFY

1. Plan — Assess Impact | 評估影響

Identify affected tables, estimate data volume, plan rollback strategy.

識別受影響的表、估算資料量、規劃回滾策略。

2. Write — Create Migration | 撰寫遷移

Write forward and rollback scripts. Use incremental, numbered migrations.

撰寫正向和回滾腳本。使用遞增編號的遷移。

3. Test — Validate Migration | 驗證遷移

Run on staging with production-like data. Verify data integrity post-migration.

在 staging 環境使用類生產資料執行。驗證遷移後資料完整性。

4. Deploy — Execute Migration | 執行遷移

Apply during maintenance window or use online schema change tools.

在維護窗口執行，或使用線上 Schema 變更工具。

5. Verify — Confirm Success | 確認成功

Check row counts, constraint validity, application functionality.

檢查列數、約束有效性、應用程式功能。

Index Strategy | 索引策略

Type	Use Case	使用場景
B-tree	Equality, range queries (default)	等值、範圍查詢（預設）
Hash	Exact match only	僅精確匹配
GIN	Full-text search, JSONB	全文搜尋、JSONB
Partial	Filtered subsets	過濾子集
Composite	Multi-column queries	多欄位查詢

Usage | 使用方式

/database                - Interactive database design guide | 互動式資料庫設計引導
/database schema         - Review schema design | 審查 Schema 設計
/database --migration    - Migration planning assistant | 遷移規劃助手

Next Steps Guidance | 下一步引導

After /database completes, the AI assistant should suggest:

資料庫設計完成。建議下一步 / Database design complete. Suggested next steps:

執行 /security 檢查資料保護措施 — Check data protection measures

執行 /testing 規劃資料庫測試策略 ⭐ Recommended / 推薦 — Plan database testing strategy

執行 /checkin 確認遷移符合提交規範 — Verify migrations meet check-in standards

產生 API 端點 → 執行 /api-design — Generate API endpoints → Run /api-design

Reference | 參考

Core standard: database-standards.md

Version History | 版本歷史

Version	Date	Changes	變更說明
1.0.0	2026-03-23	Initial release	初始版本

License | 授權

CC BY 4.0 — Documentation content