If you fan out work (HTTP calls, DB reads, image processing), the failure mode isn’t just “slow,” it’s “everything gets slow” because you saturate CPU or downstream connections. A semaphore is a simple way to cap concurrency. The important part is mak

Rust's module system uses mod to define modules and pub to control visibility. Modules can be inline (mod name { ... }) or in separate files (mod name; loads name.rs). By default, items are private; use pub to expose them. I organize code into modules

Schema migrations evolve database structure safely. I use migration tools like Flyway, Liquibase, or framework migrations. Version-controlled migrations track schema changes. Up migrations apply changes, down migrations revert. Idempotent migrations c

GitHub Actions automates build, test, and deploy workflows. Workflows are defined in .github/workflows/ YAML files. The on key specifies triggers—push, pull_request, schedule, or workflow_dispatch. Jobs run on runners with configurable OS. steps execu

Resilience4j provides resilience patterns for fault tolerance. Circuit breakers prevent cascading failures—open after threshold failures, allow retry after timeout. Rate limiters control request rates. Retry mechanisms handle transient failures. Bulkh

Counters (likes, votes, bookmarks) are classic UI glue. I keep the counter itself in a small partial with a stable id and update it via turbo streams on create/destroy. The controller can render a turbo_stream.replace of the counter plus (optionally)

Properly configured connection pools prevent ActiveRecord::ConnectionTimeoutError during traffic spikes while avoiding resource waste. The pool size should match your application's concurrency needs—for Puma with 5 threads per worker, I set pool: 5 in

When a form submits inside a Turbo Frame, a normal redirect can sometimes feel odd (especially if the redirect response doesn’t include the matching frame). A clean approach is to set the Turbo-Location header for Turbo requests. Turbo interprets it a

PostgreSQL's jsonb columns provide schema flexibility for semi-structured data without sacrificing query performance. I use JSON columns for user preferences, feature flags, or metadata that varies by record type. Unlike traditional EAV patterns, json

A small UX win: disable the like button immediately and re-enable on failure. Turbo gives you events; Stimulus coordinates button state and the server still returns the canonical count.

Pagination divides large datasets into pages, improving performance and UX. Eloquent's paginate() method returns a paginator with data and metadata. The links() method renders pagination UI. I customize per-page counts with paginate(50). Simple pagina

I generally prefer running migrations in a separate release step, but for smaller deployments it’s sometimes pragmatic to run them at startup. The failure mode to avoid is “every instance runs migrations at once.” The pattern here uses Postgres adviso