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Postgres SELECT DISTINCT scans full result set despite indexing, DBOS finds

DBOS engineers debugging a Postgres-backed queue system found that SELECT DISTINCT was their most expensive query, even though it appeared simplest. They discovered that Postgres always scans every row matching a query's predicates when computing DISTINCT values, regardless of indexing or how few unique values exist, making it a poor fit for finding active partitions in a queue workload.

Ukraine airdrops explosive ground robots behind Russian lines in Vivaldi push

Ukraine's Third Army Corps used heavy bomber drones to air-drop explosive ground robots more than six miles behind Russian lines on September 21, 2026, targeting supply routes as part of Operation Vivaldi. Separately, ground robots cleared antipersonnel mines from over 18 miles of routes, a task that would normally require two sapper companies, according to Militarnyi and United24.

INMO recalls 1,600 Air 3 smart glasses over overheating risk

The US Consumer Product Safety Commission announced a recall of about 1,643 INMO Air 3 smart glasses sold in the US, plus 120 in Canada, after ten reports that the left temple can overheat during extended use, with some users reporting burning sensations on their face and ear. The glasses were sold via Amazon, INMO's website and Kickstarter for $900 to $1,300. INMO is offering a free software update to version V3.16 to fix the defect, and the CPSC advises owners to stop wearing the glasses until updated.

Report: Cheap, generic AI agents show sharply weaker retention than vertical tools

An Entrepreneur opinion piece cites a 2025 retention study finding that AI-native software companies priced under $50 a month retain far fewer customers than established B2B SaaS firms, while those priced above $250 a month—offering more specialized functionality—retain customers at rates comparable to traditional software. The piece points to Jasper, which raised $125 million at a $1.5 billion valuation as an AI copywriting tool before facing cutbacks, as an example of a horizontal, easily replicated AI product losing pricing power.

Stable, a YC-backed mailroom startup, opens product engineer hiring

Stable, a Y Combinator W20 company that provides businesses with virtual addresses and mail management, is hiring product engineers. The company says over 15,000 businesses, including Brex, Doordash, and Gusto, currently use its platform to handle mail and serve as their registered address with the IRS and state agencies. Stable is backed by investors including Y Combinator, Craft Ventures, Shakti, and Hustle Fund.

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