@KafkaListener pattern consuming a topicPattern across tenants, using a record header for tenant identity and routing to per-tenant downstream streams

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System Administration

Enable Async Tenant Aware

Place @EnableAsync on a dedicated @Configuration that extends a tenant-aware AsyncConfigurer, so tenant/MDC context propagates across the executor boundary

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Framework Internals

Cache Variance Ttl Jitter

Add ±N% random jitter to cache TTLs so keys written together don't all expire in the same tick, avoiding synchronized recompute storms

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LLM & AI

Multi Tenant Kafka Header Organization Context

Propagate tenant/organization id from Kafka headers through async handler threads via a ThreadLocal context holder

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CI/CD

Plugin Resource Provider Architecture

Stable `ResourceProvider` SPI loaded via Spring component scan; each new device/resource type is a separate Gradle-module JAR packaged into the WAR — zero core edits

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Finance & Investment

Periodically re-evaluate candidate strategies/policies against recent data, swap the active one only when a weighted composite score beats the incumbent by a hysteresis threshold — prevents flapping while staying adaptive.

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System Administration

Careful

Safety guardrails for destructive commands. Warns before rm -rf, DROP TABLE, force-push, git reset --hard, kubectl delete, and similar destructive operations. User can override each warning. Use when touching prod, debugging live systems, or working in a shared environment. Use when asked to "be careful", "safety mode", "prod mode", or "careful mode". (gstack)

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Containers

Kafka Producer Config Avro Schema Registry

Kafka producer config template for Avro + Confluent Schema Registry with LZ4 compression, 30MB max request size, and acks=1

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Data Engineering

Kafka Consumer Errorhandling Wrapper

Wrap key/value deserializers in Spring Kafka's ErrorHandlingDeserializer so a single poison record doesn't halt the consumer

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Backend

Feed Envelope Frame

Uniform WebSocket payload wrapper with Type (ACK/SNAPSHOT/DELTA/ERROR), PayloadKind, and correlation requestId, including null-safe factory methods

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System Administration

Realtime Vs Polling Fallback

Let each resource type declare `supportsRealtime`; scheduler runs push-mode at the realtime interval and falls back to a safe polling interval (e.g., 60s) otherwise

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Data Analysis

Measurement Grouping Combiner

Group rows by `(resourceId, metricId, bucketTs)` into `Map<K, List<T>>`, then a per-granularity pure `combine…ByKey` merges each list into one composite record. One combiner per granularity (raw/1m/5m/hour/day).

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CI/CD

Spring Profile Datasource Activation

Select DB/Hibernate/logging config at JVM startup via `spring.profiles.active` so one build ships to dev, test, and prod without branching in code

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Full Stack

Dotenv Multi Env Routing

Single ENV variable flips an entire stack (REST base URL, WebSocket base, per-operation transaction IDs) between production and sandbox tiers, loaded via dotenv with OS-env precedence.

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CLI Tools

Preamble (run first)

Launch GStack Browser — AI-controlled Chromium with the sidebar extension baked in. Opens a visible browser window where you can watch every action in real time. The sidebar shows a live activity feed and chat. Anti-bot stealth built in. Use when asked to "open gstack browser", "launch browser", "connect chrome", "open chrome", "real browser", "launch chrome", "side panel", or "control my browser". Voice triggers (speech-to-text aliases): "show me the browser".

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LLM & AI

Preamble (run first)

Pair a remote AI agent with your browser. One command generates a setup key and prints instructions the other agent can follow to connect. Works with OpenClaw, Hermes, Codex, Cursor, or any agent that can make HTTP requests. The remote agent gets its own tab with scoped access (read+write by default, admin on request). Use when asked to "pair agent", "connect agent", "share browser", "remote browser", "let another agent use my browser", or "give browser access". (gstack) Voice triggers (speech-to-text aliases): "pair agent", "connect agent", "share my browser", "remote browser access".

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System Administration

Unfreeze

Clear the freeze boundary set by /freeze, allowing edits to all directories again. Use when you want to widen edit scope without ending the session. Use when asked to "unfreeze", "unlock edits", "remove freeze", or "allow all edits". (gstack)

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Debugging

Paired Flag Multi Instance Registration

CLI pattern for registering N instances of a composite config (e.g. spec+baseUrl pairs) using repeated paired flags and a pending-state parser.

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Code Quality

Setup Pre Commit

Set up Husky pre-commit hooks with lint-staged (Prettier), type checking, and tests in the current repo. Use when user wants to add pre-commit hooks, set up Husky, configure lint-staged, or add commit-time formatting/typechecking/testing.

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CI/CD

Blue Green Deploy Visualization Pattern

Dual-environment (Blue/Active vs Green/Idle) side-by-side canvas with traffic-router arrow and version badges for blue-green deployment dashboards

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Design

Canvas Chromakey Bg Removal

Browser-side background removal for sprite sheets and JPEG assets using canvas pixel data with white/color key to transparency

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Architecture Patterns

Consistent Hashing Visualization Pattern

Ring-based SVG/Canvas rendering pattern for visualizing consistent hashing node placement and key distribution

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System Administration

Sse Fetch Streaming

Fetch-based Server-Sent Events streaming with pause/resume/close control for real-time chat and data feeds

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Debugging

Widget Confid Injection Sweep

리소스 상세 대시보드에서 모든 위젯 데이터 요청에 `confId` 를 일관되게 주입하기 위한 위젯 fetch 지점 전수 스윕(sweep) 패턴 — 일부만 주입하면 같은 대시보드 안에서 위젯별 필터 동작이 갈라지는 버그를 방지한다.

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Architecture Patterns

Api Gateway Pattern Data Simulation

Generate realistic gateway traffic with burst patterns, policy hits, and backend-selection skew driven by a seeded PRNG

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System Administration

Zustand Preset Manager

Zustand + persist middleware pattern for managing N named presets (team comps, saved filters, dashboard layouts) with active-selection, max-count guard, and auto-reselect on delete.

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Architecture Patterns

Strangler Fig Visualization Pattern

Side-by-side legacy/new system visualization with traffic routing overlay for strangler-fig migration apps

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Backend

Axios Refresh Queue Zustand

Axios response interceptor that intercepts 401, queues concurrent failed requests, refreshes the token once, and replays queued requests with the new token. Prevents thundering-herd refresh calls.

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Computational Chemistry