db

A set of rules for designing databases, changing their structure safely, and reviewing queries. A migration is a controlled change to a database; the guide covers reversibility, locking, indexes, and staged changes.

In plain words
What is it for?
Use it to set naming and constraint standards, audit an existing schema, plan migrations, review query plans, choose partitions, and define tenant data-access rules.
Why use it?
It reduces the risk of data loss, downtime, slow queries, and unsafe changes as the application grows. It also helps prevent repeated database requests and inefficient scans of large tables.

Command

Part of the forge-skills plugin — 6 skills, 36 commands, 13 agents, 1 hook shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/aneja5/forge-skills/db
Clone the repo
git clone --depth 1 https://github.com/aneja5/forge-skills

Or install forge-skills, the plugin that ships this one along with the rest of its 6 skills, 36 commands, 13 agents, 1 hook.

Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 163 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00014 $0.00163
Opus 5 $0.00007 $0.00081
Sonnet 5 $0.00003 $0.00033
Haiku 4.5 $0.00001 $0.00016

Measured 2d ago against content hash 759a51bdd891, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

db 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 2d 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.

commands/db.md · 14 lines

What it actually says

Invoke the forge-skills:database-design skill.

Define naming conventions (tables, columns, FKs, indexes, constraints, audit columns). Audit existing schema for violations (missing FK indexes, no audit columns, soft-delete without cleanup). Set migration guardrails — reversibility, idempotency (IF NOT EXISTS), locking-aware (CONCURRENTLY), expand-contract pattern. Write query-review checklist — every hot query EXPLAINed, no seq scan on big tables, no N+1, cursor pagination. Identify partition candidates. Document RLS / tenant-scoping rules for multi-tenant systems.

After writing: "Database design + migrations policy written to .forge/database-design.md and .forge/migrations-policy.md."

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. 2d ago First seen · 14 lines · 14 tokens per session scan A 759a51bdd891

Subscribe to this mod's changes

db is a command published in the GitHub repository aneja5/forge-skills (3 stars, last pushed 3mo ago), licensed MIT. It adds 14 tokens to every session and 163 once invoked, about $0.0001 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.