Daleendahttps://daleenda.com/blog/feed.xml2026-08-28T15:48:09.612172+00:00The receipt you cannot deletehttps://daleenda.com/blog/the-receipt-you-cannot-delete2026-08-19T23:49:26.282452+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyGerman fiscal law requires every till transaction to be signed and kept for ten years. There is no delete. That one sentence decided more of the database than any product requirement did.Fiskalisierung in 2026: the whole stack, mappedhttps://daleenda.com/blog/fiskalisierung-germany-2026-state-of-play2026-08-18T07:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyWhich obligations bind you today, which bind you only if you take cash, and which one is still a draft bill whose start date has already moved twice this summer.Register every till with the Finanzamt by 31 Julyhttps://daleenda.com/blog/kassenmeldepflicht-july-20252025-07-08T07:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyA duty that sat unenforceable for five years because nobody had built the letterbox. The letterbox opened in January, and the queue closes at the end of this month.The Corona-Warn-App goes to sleephttps://daleenda.com/blog/corona-warn-app-sleep-mode-labfy-lessons-learned2023-06-13T07:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyFive lessons from a platform built for a moment that has now passed — including the awkward one about knowing when a product has finished its job.What the auditor actually pulls from your POShttps://daleenda.com/blog/dsfinv-k-2-3-mandatory-july-20222022-07-05T07:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadySixteen CSV files nobody looks at, produced on the one morning somebody from the Finanzamt is standing at your counter waiting for them.Labfy results now land in the Corona-Warn-Apphttps://daleenda.com/blog/labfy-corona-warn-app-integration-300-test-centers2021-12-07T08:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyA PDF in an inbox is a poor entry ticket: it gets lost, it is trivial to fake, and whoever is on the door cannot check it. A signed certificate in an app is none of those things.Introducing Labfy: software for test centreshttps://daleenda.com/blog/covid-19-test-center-software-labfy2021-03-30T07:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyA clinic that has to open in a fortnight, in a converted nightclub, staffed by people who have never run one. Most are attempting it with a spreadsheet and a group chat.The TSE deadline: hardware or cloud?https://daleenda.com/blog/tse-deadline-march-2021-hardware-vs-cloud2021-03-10T08:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyA card in a slot, or a signature from a data centre. Which one is right depends on how many tills you have and how good your internet is — and after 1 April, not choosing is itself an answer.How the Corona-Warn-App workshttps://daleenda.com/blog/corona-warn-app-explained-how-it-works2020-06-18T07:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyIt can warn you that you stood near someone who later tested positive, without any server ever learning that you stood near anyone. Here is the architecture that allows both, and why the code is public.The thirty-day digital transformationhttps://daleenda.com/blog/covid-19-digital-transformation-smes2020-03-24T08:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyFive things to do in the next month, in the order that keeps a business trading. None of them takes longer than a week to put in place.What the KassenSichV changed at every German tillhttps://daleenda.com/blog/kassensichv-live-january-20202020-01-15T08:00:00+00:002026-08-28T15:48:09.612172+00:00enTarek ElmadadyThree obligations arrived together on 1 January, and only one of them has a deadline you can safely leave until September.