A Show HN submission presents an interactive atlas of system designs, breaking down technologies like PostgreSQL, Redis, and Memcached into their core features and the specific scenarios where each is the right choice. Each entry includes architecture diagrams and defines related concepts such as consistency, caching, and rate limiting. The project appears aimed at helping engineers quickly identify which data store fits a given technical requirement.
atlas-sysdes.vercel.app
· 2026-09-22
A reader without formal computer science training describes spending a year using LLMs to build a complex TypeScript/JavaScript system with APIs, PostgreSQL, and multi-model AI pipelines. When trying to move the project to production, they found themselves stuck fixing cascading errors they didn't fully understand, realizing the system's complexity had outpaced their own comprehension. A programming writer responds publicly to the reader's letter, offering candid, non-definitive thoughts on learning and competence in an AI-assisted coding era.
blog.ploeh.dk
· 2026-09-16
PostgreSQL takes a weak AccessShareLock on a table and every one of its indexes each time it plans a query, even indexes the plan doesn't end up using. Through version 17, each backend can only record 16 such locks in a private fast-path array before overflowing into the shared lock table, which is guarded by 16 LWLock partitions that become contention points under heavy concurrent load.
thebuild.com
· 2026-09-14
A developer released Solid Objects, an open-source library that replicates the Durable Objects programming model—one identity, one state, one ordered mailbox per object—without requiring a dedicated vendor runtime or daemon. Instead, it runs directly on databases developers already operate, including SQLite, PostgreSQL, and MySQL. The release follows the creator's frustration with vendor lock-in and unpredictable metered billing tied to existing Durable Objects platforms.
solidobjects.dev
· 2026-09-08
PostgreSQL 19, now in beta ahead of a general release expected around September or October 2026, introduces support for SQL/PGQ, the property-graph portion of the SQL:2023 standard. The feature lets developers define a graph structure over existing relational tables and query it with pattern-matching syntax rather than manually writing joins. A hands-on walkthrough tested against PostgreSQL 19 beta 3 demonstrates how tables can be declared as vertices and edges and then queried using the new GRAPH_TABLE construct.
victoriametrics.com
· 2026-09-07
A PostgreSQL performance researcher shared follow-up findings on the database's random_page_cost setting, which governs how the query planner estimates the cost of random versus sequential disk reads. New benchmark data from older rotational SATA drives showed an estimated cost around 125, far higher than the long-standing default of 4.0, while SSD-based tests land closer to that default only by coincidence.
vondra.me
· 2026-09-04
Restoredrill is a new open-source command-line tool that automatically fetches the latest PostgreSQL backup, restores it into a disposable container, runs user-defined validation checks, and outputs a JSON report documenting restore time and success. It's currently at version 0.1.0 and supports only Postgres for now.
github.com
· 2026-08-27
Pgbot is a 5.9 MB open-source command-line tool that connects to PostgreSQL databases and reports on performance, indexes, schema and query health using plain-English queries and AI-generated explanations. It offers two deployment modes: connecting directly to public databases or running a local agent alongside private databases in Docker, Kubernetes, or internal server environments so credentials never leave the network. It also supports the Model Context Protocol, letting AI agents like Claude or Cursor call pgbot as a deterministic, read-only diagnostic tool.
pgbot.dev
· 2026-08-25
GoKawiil