Maak.el Brings Scheme-Powered Command Runner to Emacs as Lisp Machine

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A new Emacs package called Maak.el has been released, functioning as a command runner built around Lisp machine principles. The tool is written in Scheme and designed to be infinitely extensible within the Emacs environment. It is hosted on Codeberg, an open-source alternative to GitHub, and was shared on Hacker News. The project appears to target Emacs power users who prefer a Lisp-native workflow for running and managing commands.

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SQL Join Types Explained Using a Small Hospital Database in PostgreSQL

A tutorial published on DEV Community uses a practice hospital database with 10 patients, 10 doctors, and 10 appointments to explain how SQL joins work in PostgreSQL. The database intentionally omits foreign key constraints to illustrate that joins operate purely on matching values at query time, independent of referential integrity rules. Two patients and three doctors with no appointment records serve as test cases to demonstrate how different join types handle unmatched rows. An INNER JOIN returns only the 10 matched appointment rows, silently excluding the five people with no counterpart on the other side. A LEFT JOIN returns 12 rows, preserving all patients including the two without appointments by filling unmatched columns with NULL values.

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ProgrammingDEV Community ·

Open-Source Python Dashboard Monitors VoIP Call Quality via Telnyx Webhooks

A developer at Telnyx has released an open-source call quality monitoring tool built with Python and Flask that processes real-time voice metrics including MOS, jitter, latency, and packet loss. The application receives Telnyx webhooks, verifies each payload using Ed25519 signature validation via pynacl, and stores metrics in SQLite for historical analysis. A live browser dashboard is updated through Server-Sent Events, and alerts are triggered automatically when quality thresholds are breached. The project includes a demo server that generates its own keypair and simulates webhook payloads locally, requiring no Telnyx account or external services to run. The source code is publicly available on GitHub under the Telnyx code examples repository.

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ProgrammingDEV Community ·

Web Share API Lets Browsers Replace Outdated Social Share Icon Rows

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ProgrammingDEV Community ·

Developer Builds Serverless Chrome Extension to Export Facebook Group Data Locally

A freelance developer has released FB Extractor, a Manifest V3 Chrome extension designed to pull member and group data from Facebook without relying on any external servers or APIs. The tool runs entirely within the browser, storing all extracted data on the user's own device, and exports it as CSV or XLSX files ready for use in Excel or a CRM. To reduce the risk of account bans, the extension simulates human-like scrolling and randomized delays between actions. By design, the extension does not collect contact details such as emails or phone numbers, limiting extraction to public identifiers like user ID, name, and profile picture. A free tier allows up to 50 groups and 200 members per export run, with a paid Pro version offering unlimited extraction.

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