What does the Oleg skill do?

Oleg writes optimised SQL, designs schemas that scale, explains query performance issues, and builds the database layer that holds up under production load. Load once into Claude Projects and get a configured Database Engineer without explaining context at the start of every session.

How do I install this skill file?

Download the .md file, paste the full contents into Claude Projects Instructions, add your business context, and start your first session. Works with Claude, ChatGPT, or any AI chat accepting system prompts.

Which AI tools does this skill work with?

Works with Claude (recommended), ChatGPT, and any AI chat accepting system prompts. Claude Projects gives the best results — the skill is optimised for Claude's instruction-following capabilities.

What is included in this download?

One .md skill file delivered instantly after purchase. Contains the full role configuration, expertise context, and behavioural rules. No subscription required — yours permanently. Works with Claude, ChatGPT, or any AI chat.

How is this different from using Claude without the Oleg skill?

Without a skill file, Claude starts every session as a general-purpose assistant. With Oleg loaded, Claude applies Database Engineer expertise and methodology from the first message — no re-explaining, consistent quality every time.

Database Engineer Skill for Claude & ChatGPT

Name: Oleg — Database Engineer AI Skill
Brand: KissMySkills
SKU: oleg-database-engineer
Price: 19.0 USD
Availability: InStock
Rating: 4.92 (24 reviews)

Oleg — Database Engineer AI Skill

$19.00

Oleg — Database Engineer AI Skill

$19.00

⚡ Instant download ◆ Claude & ChatGPT ∞ Keep forever

Instant download · 30-day money-back guarantee. Pay once, keep forever — no subscription. Refund policy

Write optimised SQL, design schemas that scale, and stop guessing why queries are slow.

Schema design: 3NF, denormalisation, OLTP vs OLAP
SQL: CTEs, window functions, JSONB, recursive queries
Query optimisation via EXPLAIN/ANALYZE and index strategy
Zero-downtime migrations and Redis caching patterns

Backend and data engineers wrestling with database performance.A database consultant bills $150+/hr — this is one file, yours forever.

// what's inside

Drop Oleg into Claude and get a Senior Database Engineer who writes optimised SQL, designs schemas that don't fall apart at scale, and explains query plans so you stop guessing why things are slow.

No black-box queries. Oleg reads EXPLAIN/ANALYZE output, spots missing indexes, rewrites ORM-generated SQL that's quietly killing your performance, and handles zero-downtime migrations that don't wake you up at 3am. PostgreSQL, MySQL, MongoDB, Redis — all covered in one skill file.

What you get

→ Schema design — normalised 3NF schemas, denormalisation strategies, OLTP vs OLAP modelling, hierarchical patterns, and MongoDB document design
→ SQL mastery — CTEs, window functions, recursive queries, LATERAL joins, JSONB operators, full-text search, transactions with proper isolation levels
→ Query optimisation — EXPLAIN/ANALYZE interpretation, B-tree, GIN, GiST, partial and covering index strategies, N+1 detection, ORM SQL fixing
→ Zero-downtime migrations — expand-and-contract pattern, online DDL, batched data migrations with Prisma, Alembic, Flyway, or raw SQL
→ Redis — caching patterns (cache-aside, write-through, stampede prevention), pub/sub, sorted sets, streams, and Redis Cluster configuration
→ Reliability and operations — backup strategies, streaming replication, PgBouncer, slow query logging, replication lag alerting, and disaster recovery
→ Cloud databases — AWS RDS, Aurora, DynamoDB, ElastiCache, GCP Cloud SQL, BigQuery — sizing, storage selection, and cost optimisation

📄 claude-database-engineer.skill

Under 2 min install

Works with Claude, ChatGPT & any AI chat

How to install

Download the .skill package → open Claude → paste SKILL.md into your Project Instructions or system prompt → describe your data problem → Claude designs and optimises it. That's it.

claude-database-engineer.md

# Oleg — Database Engineer AI Skill

You are Oleg, a senior database engineer across PostgreSQL, MySQL, MongoDB and Redis. No black-box queries — every recommendation is backed by the query plan.

## What you do
- Schema design: 3NF, denormalisation, OLTP vs OLAP, document modelling
- Query optimisation: EXPLAIN/ANALYZE reading, index strategy, N+1 fixes
- Zero-downtime migrations: expand-and-contract, online DDL, batched data moves

## How you work
1. Read the actual query plan before guessing
2. Give the exact index or rewrite, not vague advice
3. Ship changes with a migration that won't wake you at 3am

Excerpt from the actual file you'll download.

// try it

prompt

$This dashboard query takes 8 seconds on Postgres — read the EXPLAIN output and tell me what index to add.

Oleg returns: a read of your EXPLAIN/ANALYZE plan pinpointing the slow step → the exact index to add (type and columns) → the rewritten query without the N+1 → a zero-downtime migration to ship it safely.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the file anywhere on your device.
02
Open your AI chat
Claude, ChatGPT, Gemini, Grok, or Copilot — whichever one you already use.
03
Paste the file contents
Drop it into the system prompt, Project instructions, or custom instructions field.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.