Databases

Configure LangChain4J vector stores for RAG applications. Use when building semantic search, integrating vector databases (PostgreSQL/pgvector, Pinecone, MongoDB, Milvus, Neo4j), implementing embedding storage/retrieval, setting up hybrid search, or optimizing vector database performance for production AI applications.

Unit tests for caching behavior using Spring Cache annotations (@Cacheable, @CachePut, @CacheEvict). Use when validating cache configuration and cache hit/miss scenarios.

Guidance for using Forgetful semantic memory effectively. Applies Zettelkasten atomic memory principles. Use when deciding whether to query or create memories, structuring memory content, or understanding memory importance scoring.

Comprehensive NestJS framework guide with Drizzle ORM integration. Use when building NestJS applications, setting up APIs, implementing authentication, working with databases, or integrating Drizzle ORM. Covers controllers, providers, modules, middleware, guards, interceptors, testing, microservices, GraphQL, and database patterns.

AWS Secrets Manager patterns using AWS SDK for Java 2.x. Use when storing/retrieving secrets (passwords, API keys, tokens), rotating secrets automatically, managing database credentials, or integrating secret management into Spring Boot applications.

AWS RDS (Relational Database Service) management using AWS SDK for Java 2.x. Use when creating, modifying, monitoring, or managing Amazon RDS database instances, snapshots, parameter groups, and configurations.

Query logs from Axiom for debugging (read-only, no ingestion allowed)

Expert in Spring Data Neo4j integration patterns for graph database development. Use when working with Neo4j graph databases, node entities, relationships, Cypher queries, reactive Neo4j operations, or Spring Data Neo4j repositories. Essential for graph data modeling, relationship mapping, custom queries, and Neo4j testing strategies.

Database migrations and Drizzle ORM guidelines for the vm0 project

Access GitHub API using gh CLI in sandboxed environment - install binary, authenticate with tokens, query repos, PRs, issues, workflow runs, and download artifacts

CODE PHASE (Database): Data layer implementation patterns and best practices.Provides schema design patterns, query optimization strategies, indexing guidelines,data integrity constraints, migration patterns, and database security practices.Use when: designing schemas, writing queries, optimizing performance, planningmigrations, implementing data validation, ensuring data integrity.

ARCHITECT PHASE: Architectural design patterns, component templates, and system design guidance.Provides proven architectural patterns including microservices, layered architecture,event-driven systems, C4 diagram templates, API contract formats, and design anti-patterns.Use when: designing system architecture, creating component diagrams, defining interfaces,planning component boundaries, choosing architectural patterns, organizing system modules,or when user mentions: architecture, components, system design, diagrams, C4, microservices,API contracts, service boundaries, architectural patterns.Use for: component design, interface definition, system boundaries, dependency management,architecture documentation, design patterns, integration patterns.DO NOT use for: code implementation details, specific framework syntax, database schema design,frontend-specific patterns, testing strategies, or security implementation (use dedicated skills).

Database management commands and the bin/run utility for executing Ruby scripts against specific event databases. Use when the user needs to query, manipulate, or run scripts against existing databases without starting a Rails server.

Automatically discover database skills when working with SQL, PostgreSQL, MongoDB, Redis, database schema design, query optimization, migrations, connection pooling, ORMs, or database selection. Activates for database design, optimization, and implementation tasks.

Diagnose xcodebuild builds using argus. Use this instead of parsing xcodebuild output to avoid filling the context window. Query build errors, warnings, slowest targets, bottlenecks, implicit/redundant dependencies, and dependency graph with linking information for optimization analysis.

Comprehensive analysis of BigQuery usage patterns, costs, and query performance

Recommend technology stacks based on project requirements, team expertise, and constraints. Use when selecting frameworks, languages, databases, and infrastructure for new projects.

Reference documentation for Broadcast API (sendbroadcast.net) integration. Use when working with the Broadcast email provider, creating/updating broadcasts, managing subscribers, or debugging API issues.

Interactive markdown review with web UI. Use when: - User says "review this", "check this plan", "/review" - User wants to give feedback on a plan or document - User says "let me review", "피드백", "검토해줘" - User specifies a file path to review (e.g., "review /path/to/file.md")

This skill should be used when inspecting, analyzing, or querying Claude Code session logs. Use when users ask about session history, want to find sessions, analyze context usage, extract tool call patterns, debug agent execution, or understand what happened in previous sessions. Essential for understanding Claude Code's ~/.claude/projects/ structure, JSONL session format, and the erk extraction pipeline.