data-model SKILL.md skillA
data-model from rustyrazorblade/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add rustyrazorblade/skills/data-model@git:20261031.8909b5ePins git:20261031.8909b5e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- rustyrazorblade/skills
- Path
plugins/cassandra-expert/skills/data-model/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261031.8909b5e, committed Oct 31, 2026
- First version recorded
- Feb 22, 2026
- Size
- 20,756 bytes
- Repository stars
- 44
- License
- Apache-2.0
Data modeling and schema design for Apache Cassandra. Use when designing tables, choosing partition keys, modeling time-series data, or reviewing existing schemas.
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
# Cassandra Data Modeling You are an expert Cassandra data modeler focused on query-driven schema design. ## Version Identification **IMPORTANT:** At the beginning of any data modeling discussion, immediately ask the user which Cassandra version they are using. Data modeling features and recommendations vary by version: - **Cassandra 3.x**: Materialized views (discouraged), SASI indexes, legacy compaction strategies - **Cassandra 4.0**: Improved LWT performance, virtual tables - **Cassandra 4.1**: Paxos V2 for better LWT performance (start `concurrent_writes` at 64, and raise it when CPU is available and `MutationStage` `Pending` stays above 0) - **Cassandra 5.0**: SAI (Storage-Attached Indexes) for flexible querying, UCS compaction strategy, Trie memtables Knowing the version ensures schema recommendations leverage available features and avoid unsupported ones. ## Core Principles ### Query-First Design - Start with the queries you need to support - Design tables to satisfy each query pattern - Denormalization is expected and necessary - One table per query pattern is common ## Denormalization Strategy …
Read the whole file at its exact version.
How to install
mdr add rustyrazorblade/skills/data-model@sha256:2b5bf8979eb0ca6bThe line at the top of this page pins the label git:20261031.8909b5e, 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_iwu6xx2jz2rv7nts)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Feb 22, 2026 and Oct 31, 2026, about one every 50 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261031.8909b5e latest | 2026-10-31 | 8909b5e | 20,756 B | A | view · diff |
| git:20260325.298c24e | 2026-03-25 | 298c24e | 20,089 B | A | view · diff |
| git:20260324.70fc6f2 | 2026-03-24 | 70fc6f2 | 7,378 B | A | view · diff |
| git:20260306.3493563 | 2026-03-06 | 3493563 | 6,564 B | A | view · diff |
| git:20260222.ee880f6 | 2026-02-22 | ee880f6 | 6,540 B | A | view · diff |
| git:20260222.a392c9a | 2026-02-22 | a392c9a | 6,519 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 (20756 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
rustyrazorblade/skills · 44 stars · license Apache-2.0 · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_iwu6xx2jz2rv7nts GET https://markdownregistry.com/api/v1/resolve?ref=rustyrazorblade/skills/data-model GET https://markdownregistry.com/api/v1/blob/2b5bf8979eb0ca6ba08815b2fa0b28750685437ce810e4cd7706e9ce4f09f359
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.
More from rustyrazorblade/skills
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