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Databases Skill · microck | DecimalAI

databy microck

Databases Skill

microck/databases

Source microck/ordinary-claude-skills ↗License NOASSERTION

Work with MongoDB (document database, BSON documents, aggregation pipelines, Atlas cloud) and PostgreSQL (relational database, SQL queries, psql CLI, pgAdmin).

SkillScore95Maintained

Automatic

Data Engineer pack

Last verified 8/21/2026

What it changes

Passed 21 of 22 test cases with the skill, and 17 of 22 without it.

Without skill77%

With skill95%

Checks it passed that the model alone missed

Includes --db postgres
Includes the flag --db mongodb
Includes the flag --threshold 100ms

and 5 more in the full report

4 fixed17 passed either way1 still failing0 broke

Pass-rate lift: +18 pp
Tokens: +116%
Agent turns: 0%
Response time: -22%

Model gemini-3.6-flashMeasured 8/21/2026v121 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/microck-databases/SKILL.md https://app.decimal.ai/s/microck-databases/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add microck-databases, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/microck-databases/ and pins it in .decimal/skills.lock

decimalai skills add microck-databases

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/microck-databases/SKILL.md https://app.decimal.ai/s/microck-databases/SKILL.md

Raw file: /s/microck-databases/SKILL.md ↗ · machine-readable summary at /s/microck-databases.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

We need to run a local backup of our relational database using the bundled Python administrative utilities in this repository. What exact command exports the backup to /backups/?

What was checked, without and with the skill
Checked	Without skill	With skill
Executes python scripts/db_backup.py --db postgres --output /backups/	Missed	Passed

case-11 · gemini-3.6-flash · 8/21/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md226 linessingle file

Databases Skill

Unified guide for working with MongoDB (document-oriented) and PostgreSQL (relational) databases. Choose the right database for your use case and master both systems.

When to Use This Skill

Use when:

Designing database schemas and data models
Writing queries (SQL or MongoDB query language)
Building aggregation pipelines or complex joins
Optimizing indexes and query performance
Implementing database migrations
Setting up replication, sharding, or clustering
Configuring backups and disaster recovery
Managing database users and permissions
Analyzing slow queries and performance issues
Administering production database deployments

Database Selection Guide

Choose MongoDB When:

Schema flexibility: frequent structure changes, heterogeneous data
Document-centric: natural JSON/BSON data model
Horizontal scaling: need to shard across multiple servers
High write throughput: IoT, logging, real-time analytics
Nested/hierarchical data: embedded documents preferred
Rapid prototyping: schema evolution without migrations

Best for: Content management, catalogs, IoT time series, real-time analytics, mobile apps, user profiles

Choose PostgreSQL When:

Strong consistency: ACID transactions critical
Complex relationships: many-to-many joins, referential integrity
SQL requirement: team expertise, reporting tools, BI systems
Data integrity: strict schema validation, constraints
Mature ecosystem: extensive tooling, extensions
Complex queries: window functions, CTEs, analytical workloads

Best for: Financial systems, e-commerce transactions, ERP, CRM, data warehousing, analytics

Track record

Benchmark

21 / 22

test cases passed, vs 17 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

microck / ordinary-claude-skills

skills_all/databases/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

Databases Skill

When to Use This Skill

Database Selection Guide

Choose MongoDB When:

Choose PostgreSQL When:

Track record

Benchmark

Adoption

SkillSafety

Source

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