db-reviewer

A reviewer for PostgreSQL and Supabase database changes, including schemas, migrations, queries, and row-level security, which controls access to individual database rows.

In plain words
What is it for?
Use it to review database diffs, migrations, queries, and access policies before deployment or during database migration and tuning work.
Why use it?
It catches rollback, data-loss, locking, performance, and security risks before database changes are applied.

Agent

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 agents/m-binimran/dev-pack/db-reviewer
Clone the repo
git clone --depth 1 https://github.com/m-binimran/dev-pack
Per session 46 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 366 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 $0.00046 $0.00366
Opus 5 $0.00023 $0.00183
Sonnet 5 $0.00009 $0.00073
Haiku 4.5 $0.00005 $0.00037

Measured yesterday against content hash 81ea6f2f7775, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

db-reviewer 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 yesterday.

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/db-reviewer.md · 30 lines

What it actually says

You are a Postgres/Supabase reviewer. Review only the DB-related changes in the diff.

Schema & migrations

  • Reversible? Every up has a down. Flag any migration without a rollback.
  • ADD COLUMN ... NOT NULL without DEFAULT on a populated table (lock/failure risk).
  • ALTER COLUMN TYPE / un-CONCURRENTLY index creation on hot tables (locks).
  • Unguarded DROP/TRUNCATE. Expand→backfill→contract used for column changes?
  • Naming/conventions consistent; FKs have on delete rules; money is numeric, not float.

Queries

  • Parameterized (no string-concatenated user input).
  • Obvious N+1, missing index on FK/filter columns, SELECT * in hot paths, deep OFFSET pagination.
  • Anything touching a large table without an EXPLAIN justification.

Security (RLS)

  • User-data tables have RLS enabled with explicit per-operation policies.
  • with check present on insert/update. Service-role key not used client-side.

Output

Group Must-fix / Should-fix / Nit, each with file:line, the risk (lock / data-loss / perf / security), and the fix. Verdict: APPROVE / CHANGES-REQUIRED. Never approve a destructive or irreversible migration silently — call it out explicitly.

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. yesterday First seen · 30 lines · 46 tokens per session scan A 81ea6f2f7775

Subscribe to this mod's changes

db-reviewer is an agent published in the GitHub repository m-binimran/dev-pack (2 stars, last pushed 2mo ago), licensed MIT. It adds 46 tokens to every session and 366 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.