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Why UNIQUE(event_id) Is the Double-Charge Defense Your Agent Rail Can't Skip

Why "UNIQUE(event_id)" Is the Double-Charge Defense Your Agent Rail Can't Skip FractalMesh / IronVision Nexus · son, real engineering, no buzzword theater Every payment integration — AI agent or otherwise — has one feature buyers can it charge me twice? Not "will it behave." Can it physically fail in the way that hurts people. The cloud-favorite answer is "webhooks are at-least-once delivery, so make Our order ledger stores every event against UNIQUE(event_id). The webhook on the raw body; the

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ExternalSoftware Engineering
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LuaDB: A pure Lua embeddable SQL database for game save files, state tracking, and cloud sync

Wanted to share a project I've been building called LuaDB: a lightweight, zero-dependency embeddable database system written in pure Lua. Why pure Lua? Cross-platform embedding without needing C bindings or compiling native SQLite shared libraries (great for LÖVE, Roblox, OpenResty, or embedded devices). What it includes: Full B+Tree index engine on 4KB slotted binary pages https://github.com/jncastilho/luadb Would love to hear your thoughts and feedback!

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ExternalSoftware Engineering
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Comparing pricing models across four WordPress maintenance tools — what the shape of a price reveals about cost structure

Background While surveying the major WordPress maintenance tools (ManageWP, MainWP, WP Umbrella, and InfiniteWP), one thing stood out once their pricing was laid side by side: this isn't just a matter of "cheaper vs. more expensive." The shape of the pricing itself differs completely from company to company. And that shape isn't arbitrary — it closely mirrors how each company actually delivers its service. ManageWP: free core, stacked per-site add-ons The core dashboard is free. Features like

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ExternalSoftware Engineering
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The Neo Fermi/Wilson AI Paradox

The original Fermi paradox asks: If intelligent alien civilizations should be abundant, where is everybody? The Neo-Fermi/Wilson paradox asks: If AI is producing enormous quantities of excellent software, where is all the excellent software? We are told that implementation has been transformed: agents write code, discover defects, review changes, operate continuously, preserve memory, evaluate one another, and improve the factories that produce still more agents and software. Yet the visible wor

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