backend-data SKILL.md skillA
backend-data from bekaku/java-spring-boot-starter is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add bekaku/java-spring-boot-starter/backend-data@git:20260924.15dc64aPins git:20260924.15dc64a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- bekaku/java-spring-boot-starter
- Path
.agents/skills/backend-data/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260924.15dc64a, committed Sep 24, 2026
- First version recorded
- Sep 21, 2026
- Size
- 6,484 bytes
- Repository stars
- 31
- License
- none declared
Use when adding or changing a JPA entity, column, relation, repository query, MyBatis read model, Flyway migration, MapStruct mapper, Snowflake ID, audit field, soft delete, or permission seed data in this Spring Boot backend.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Backend Data — Playbook
> **Role:** HOW to change persistence safely. Binding facts + evidence: `skills/backend/DATA.md` (read it too).
> **Requires:** `backend-core`. **Often paired with:** `backend-api`, `backend-security`, `backend-testing`.
## Know this first
- Local dev runs Hibernate `ddl-auto: update` and **Flyway is disabled**. Your app starting locally proves nothing about the migration. You must still write the migration.
- IDs are Snowflake `Long` from `Id#generateId`. Never add `@GeneratedValue`.
- JPA = CRUD, filters, simple lookups. MyBatis = joined/paged DTO read models only. No new MyBatis writes.
## Recipe A — add a column to an existing entity
1. Add the field to `model/{Model}.java` with `@Column(name = "snake_case", comment = "...")`.
2. Add a migration `V{next}__add_{column}_to_{table}.sql` (list `src/main/resources/db/migration/` for `{next}`):
```sql
ALTER TABLE {table} ADD COLUMN IF NOT EXISTS {column} character varying(255);
COMMENT ON COLUMN {table}.{column} IS '...';
```
3. Add the field to the DTO (with validation + i18n message key) and check the mapper maps it in both directions.
…Read the whole file at its exact version.
How to install
mdr add bekaku/java-spring-boot-starter/backend-data@sha256:a52bd78e1f9023d5The line at the top of this page pins the label git:20260924.15dc64a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_azzpuipdh22u4joa)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 21, 2026 and Sep 24, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260924.15dc64a latest | 2026-09-24 | 15dc64a | 6,484 B | A | view · diff |
| git:20260923.b5acb6d | 2026-09-23 | b5acb6d | 2,176 B | A | view · diff |
| git:20260921.de5eb9f | 2026-09-21 | de5eb9f | 1,296 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6484 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
bekaku/java-spring-boot-starter · 31 stars · license none declared · pushed 2026-11-03 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_azzpuipdh22u4joa GET https://markdownregistry.com/api/v1/resolve?ref=bekaku/java-spring-boot-starter/backend-data GET https://markdownregistry.com/api/v1/blob/a52bd78e1f9023d56815d728b0d8a80d4f85c8cedd9a32f31d2d86d51d440c1b
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.