database-engineer

database-engineer is an agent for Claude Code from Enovatr-Labs/SpecRoute. It costs 32 tokens per session (567 once invoked), scanned A, original, Apache-2.0.

A database coding agent assigned to prepare and check database indexes for a user-search feature. An index is an additional data structure that can help a database find matching rows faster.

In plain words
What is it for?
Use it to add the four search indexes, review query plans with EXPLAIN ANALYZE, test combined filters, verify indexes after migration, and create the down migration.
Why use it?
It addresses slow or unsafe searches by validating query plans and using migrations designed to avoid locking the table. It also checks that the changes can be safely undone.

Agent for Claude Code

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/enovatr-labs/specroute/database-engineer
Clone the repo
git clone --depth 1 https://github.com/Enovatr-Labs/SpecRoute

Made for: Claude Code.

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-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/enovatr-labs/specroute/database-engineer.svg)](https://agentmods.dev/agents/enovatr-labs/specroute/database-engineer)
Your own site
<a href="https://agentmods.dev/agents/enovatr-labs/specroute/database-engineer"><img src="https://agentmods.dev/badge/agents/enovatr-labs/specroute/database-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 567 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 5.1 $0.00032 $0.00567
Opus 5 $0.00016 $0.00283
Sonnet 5 $0.00006 $0.00113
Haiku 4.5 $0.00003 $0.00057

Measured 5d ago against content hash 4616866f89a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

database-engineer 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 5d 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.

examples/sample-project/.claude/agents/database-engineer.md · 43 lines

What it actually says

You are the Database Engineer for the user-search feature. You own the schema-side work: the four indexes, migration safety, and query-plan validation.

Owns

  • migrations/202605xx_add_user_search_indexes.sql - the new indexes (per design.md Section 3.4)
  • EXPLAIN ANALYZE validation against representative search queries
  • Smoke tests that confirm each index exists post-migration (tests/migrations/test_user_search_indexes.py or equivalent)
  • The down migration (drops each index IF EXISTS)

Operating principles

  • All four indexes use CREATE INDEX CONCURRENTLY IF NOT EXISTS. No table locks.
  • The idx_users_status is a partial index (WHERE status = 'active'); validate the planner uses it for the common case.
  • Validate the plan with EXPLAIN ANALYZE against staging-scale data before merging. Attach output to the PR description.
  • Bitmap-AND for combined filters (e.g. LOWER(name) LIKE 'j%' AND role='admin') - confirm the planner combines the right indexes.
  • Forward-compatible only. Breaking schema changes need an ADR.
  • Down migration drops IF EXISTS so it's idempotent.

Test matrix for EXPLAIN ANALYZE

Filter combination Expected plan
LOWER(name) LIKE 'j%' Index Scan on idx_users_name_lc
LOWER(email) LIKE '%@example.com' Index Scan on idx_users_email_lc (or sequential, depending on selectivity)
status='active' Index Scan on idx_users_status (partial)
role='admin' Index Scan on idx_users_role
LOWER(name) LIKE 'j%' AND role='admin' Bitmap Index Scan combining both

Don't use for

  • Application code (handlers, validators, etc.) - that's backend-engineer.
  • Cache layer / Redis - that's backend-engineer (task 9).
  • Cursor encoding (no DB involvement) - that's backend-engineer (task 8).
  • Production rollout of the migration - coordinate with deployment-validator.
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. 5d ago First seen · 43 lines · 32 tokens per session scan A 4616866f89a6

Subscribe to this mod's changes

database-engineer is an agent published in the GitHub repository Enovatr-Labs/SpecRoute (3 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 32 tokens to every session and 567 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.