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From Dreo space heaters to $10 hot water bottles — 12 essentials I swear by to keep my home warm

Winter is on the way, but you can warm your home for less with this selection of useful devices and simple purchases that will keep you cozy into the new year.

From Dreo space heaters to $10 hot water bottles — 12 essentials I swear by to keep my home warm

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A 3 ms ALTER can stall Postgres: how to migrate a 5-billion-row table with no downtime

An ALTER TABLE that takes 3 ms can still stall every query on the table. In my first demo it took 3 ms. In a second one, on real Postgres, a long transaction held the table, so a similar ALTER waited…

  • 3 ms ALTER statement delays all queries on affected table.
  • ALTER took 3 seconds after long-running transaction blocked table.
  • Migration method minimizes downtime for 5-billion-row table.

OnBlink: Communicate with minimal movement

This is a submission for the Presage SmartSpectra SDK Challenge What I Built OnBlink lets someone speak a phrase or open an app using only their eyes and a regular webcam. A blink signal opens a menu.

  • OnBlink enables communication via minimal eye movements
  • Uses SmartSpectra to detect double blinks, long blinks
  • Customizable menu with phrases or app opening

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