database-expert SKILL.md skillA
database-expert from travisjneuman/.claude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add travisjneuman/.claude/database-expert@git:20260207.49cc324Pins git:20260207.49cc324 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- travisjneuman/.claude
- Path
skills/database-expert/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260207.49cc324, committed Feb 7, 2026
- First version recorded
- Dec 18, 2025
- Size
- 12,877 bytes
- Repository stars
- 105
- License
- MIT
Advanced database design and administration for PostgreSQL, MongoDB, and Redis. Use when designing schemas, optimizing queries, managing database performance, or implementing data patterns.
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
# Database Expert
Comprehensive guide for database design, optimization, and administration.
## Database Selection
| Database | Type | Best For |
| -------------- | ---------- | ----------------------------------- |
| **PostgreSQL** | Relational | Complex queries, ACID, JSON support |
| **MongoDB** | Document | Flexible schemas, rapid iteration |
| **Redis** | Key-Value | Caching, sessions, real-time |
| **SQLite** | Embedded | Mobile, desktop, testing |
---
## PostgreSQL
### Schema Design
```sql
-- Users table with proper constraints
CREATE TABLE users (
id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
email VARCHAR(255) NOT NULL UNIQUE,
password_hash VARCHAR(255) NOT NULL,
full_name VARCHAR(100) NOT NULL,
status VARCHAR(20) NOT NULL DEFAULT 'active'
CHECK (status IN ('active', 'inactive', 'suspended')),
created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);
-- Index for common queries
CREATE INDEX idx_users_email ON users(email);
CREATE INDEX idx_users_status ON users(status) WHERE status = 'active';
…Read the whole file at its exact version.
How to install
mdr add travisjneuman/.claude/database-expert@sha256:91db88d0f5da915dThe line at the top of this page pins the label git:20260207.49cc324, 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_vlziijx7o5h7mku7)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Dec 18, 2025 and Feb 7, 2026, about one every 26 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260207.49cc324 latest | 2026-02-07 | 49cc324 | 12,877 B | A | view · diff |
| git:20260113.90b2d6e | 2026-01-13 | 90b2d6e | 8,361 B | A | view · diff |
| git:20251218.8e57ad2 | 2025-12-18 | 8e57ad2 | 8,241 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 (12877 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
travisjneuman/.claude · 105 stars · license MIT · pushed 2026-10-19 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_vlziijx7o5h7mku7 GET https://markdownregistry.com/api/v1/resolve?ref=travisjneuman/.claude/database-expert GET https://markdownregistry.com/api/v1/blob/91db88d0f5da915d43fefbb1c332af9494fe1fe3c9d9f5fd7a48e87c5e23e97c
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.