What is db-operations?

A reference guide for database migrations, query performance, backups, monitoring, and risky production changes. A migration is a controlled change to a database's structure or data.

Use it to plan and test migrations, inspect slow queries with `EXPLAIN ANALYZE`, check indexes and N+1 queries, monitor databases, and handle dangerous operations safely.

It reduces common database risks, such as locking large tables, running slow queries, losing data, or changing production data without a backup.

How velesnitski/php-agents-boilerplate configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to velesnitski/php-agents-boilerplate. 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/velesnitski/php-agents-boilerplate/main/.claude/skills/db-operations/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/velesnitski/php-agents-boilerplate

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/velesnitski/php-agents-boilerplate/db-operations/github.svg)](https://agentmods.dev/skills/velesnitski/php-agents-boilerplate/db-operations)

Your own site

<a href="https://agentmods.dev/skills/velesnitski/php-agents-boilerplate/db-operations"><img src="https://agentmods.dev/badge/skills/velesnitski/php-agents-boilerplate/db-operations/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/velesnitski/php-agents-boilerplate/db-operations"><img src="https://agentmods.dev/badge/skills/velesnitski/php-agents-boilerplate/db-operations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 347 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.

Model	Per session	Once invoked
Fable 5.1	$0.00013	$0.00347
Opus 5	$0.00006	$0.00173
Sonnet 5	$0.00003	$0.00069
Haiku 4.5	$0.00001	$0.00035

Measured 8d ago against content hash fbd52744dc57, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

db-operations 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 8d 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.

.claude/skills/db-operations/SKILL.md · 47 lines

What it actually says

Database Operations

Migration Safety

Always --pretend first on production
Always have a down() method
Never DROP or TRUNCATE without backup
Test migration on staging before prod
For large tables: use batched operations, avoid locking

Query Optimization Checklist

Run EXPLAIN ANALYZE on slow queries
Check for missing indexes (WHERE, JOIN, ORDER BY columns)
Check for N+1 – use with() eager loading
Avoid SELECT * – specify columns
Use chunk() or cursor() for large result sets
Consider composite indexes for multi-column WHERE

Dangerous Operations (require user confirmation)

DROP TABLE / DROP COLUMN
TRUNCATE
DELETE without WHERE
ALTER TABLE on large tables (may lock)
Any direct production DB modification

Backup Commands

mysqldump -u USER -p DB > backup_$(date +%Y%m%d_%H%M%S).sql
pg_dump -U USER DB > backup_$(date +%Y%m%d_%H%M%S).sql

Monitoring Queries

-- Active connections
SHOW PROCESSLIST;
-- Slow queries
SHOW VARIABLES LIKE 'slow_query%';
-- Table sizes
SELECT table_name, ROUND(data_length/1024/1024, 2) AS size_mb
FROM information_schema.tables WHERE table_schema = 'YOUR_DB';

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.

8d ago First seen · 47 lines · 13 tokens per session scan A fbd52744dc57

Subscribe to this mod's changes

db-operations is a skill published in the GitHub repository velesnitski/php-agents-boilerplate (2 stars, last pushed 1mo ago), licensed MIT. It adds 13 tokens to every session and 347 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.

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php-agents-boilerplate: Skill for Claude Code