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awesome-ai-agent-skills: Skill for Claude Code

.agents/skills/database-design/SKILL.md

database-design is a skill for Claude Code, Codex from LionelHuanSi/awesome-ai-agent-skills. It costs 38 tokens per session (368 once invoked), scanned A, original, MIT.

A set of design and migration rules for PostgreSQL databases, including table structure, data types, indexes, query loading, and schema changes. PostgreSQL is a relational database, and migrations are scripts that change its structure over time.

In plain words
What is it for?
Use it when designing PostgreSQL tables, choosing keys and constraints, adding indexes, preventing N+1 queries, or planning Alembic or Prisma migrations. It covers UUID or numeric IDs, UTC timestamps, JSONB data, currency values, audit fields, and backward-compatible changes.
Why use it?
It helps prevent common database problems such as unclear relationships, inaccurate timestamps, unsafe money storage, slow queries, repeated database requests, and breaking schema changes.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is LionelHuanSi/awesome-ai-agent-skills's own configuration. It tells Claude Code and Codex how to work on awesome-ai-agent-skills itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything awesome-ai-agent-skills configures →

not rated 3repo 1mo ago A scan 38 tokens original MIT
View source ↗ LionelHuanSi/awesome-ai-agent-skills
Reuse

Borrowing it

Nothing to install: this file belongs to LionelHuanSi/awesome-ai-agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/LionelHuanSi/awesome-ai-agent-skills/main/.agents/skills/database-design/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/LionelHuanSi/awesome-ai-agent-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for database-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/lionelhuansi/awesome-ai-agent-skills/database-design/github.svg)](https://agentmods.dev/skills/lionelhuansi/awesome-ai-agent-skills/database-design)
Your own site
<a href="https://agentmods.dev/skills/lionelhuansi/awesome-ai-agent-skills/database-design"><img src="https://agentmods.dev/badge/skills/lionelhuansi/awesome-ai-agent-skills/database-design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for database-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/lionelhuansi/awesome-ai-agent-skills/database-design"><img src="https://agentmods.dev/badge/skills/lionelhuansi/awesome-ai-agent-skills/database-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 368 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00038 $0.00368
Opus 5 $0.00019 $0.00184
Sonnet 5 $0.00008 $0.00074
Haiku 4.5 $0.00004 $0.00037

Measured 12d ago against content hash 3b8e871d7be5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

database-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/database-design/SKILL.md · 32 lines

What it actually says

Database Design & Migration Skill

Sourced from PatrickJS/awesome-cursorrules database & ORM rules.

Relational Schema Design Standards

  1. Primary Keys: Use UUIDv4 or BIGINT (BIGSERIAL) primary keys.
  2. Foreign Keys & Constraints: Define explicit foreign key constraints with cascade/set null rules.
  3. Data Types:
    • Timestamps: Always use TIMESTAMPTZ (UTC).
    • Semi-structured data: Use JSONB with GIN indexes instead of raw text JSON.
    • Financial/Currency values: Use NUMERIC(12, 2) or integer cents, never FLOAT.
  4. Audit Fields: Every core table must include created_at, updated_at, and optional deleted_at (for soft deletes).

Indexing & Query Optimization

  • Foreign Key Indexing: Always add indexes on foreign key columns.
  • Search & Filtering: Create composite indexes for high-frequency multi-column queries.
  • N+1 Query Prevention: Enforce eager loading / join fetches to eliminate N+1 database roundtrips.

Migration Best Practices

  • Never Modify Live Migrations: Treat existing database migration scripts as immutable.
  • Backwards Compatibility: Implement 2-phase non-breaking migrations when renaming or removing columns.
  • Tooling: Alembic (Python) / Prisma / Drizzle (TypeScript).
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 32 lines · 38 tokens per session scan A 3b8e871d7be5

Subscribe to this mod's changes

database-design is a skill published in the GitHub repository LionelHuanSi/awesome-ai-agent-skills (3 stars, last pushed 1mo ago), licensed MIT. It adds 38 tokens to every session and 368 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

DatabasesPostgreSQL
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