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Record that downloads fill the Cache and ship the built app.

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A failed open can repair the shell, and the installed PWA matches Ziele, Einstellungen, and the view download.

Co-authored-by: Cursor <cursoragent@cursor.com>
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konrad
2026-10-09 08:55:43 +02:00
co-authored by Cursor
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docs/adr/0003-downloads-fill-the-cache.md
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status: accepted
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# Downloads fill the Cache
A download writes missing Kacheln into the Cache and does not mark a Gebiet. Hessen means every Kachel of that Gebiet. The current view means every Kachel that intersects the view at the moment of the request, at every prepared scale. Closing the app stops that fetch, and opening the app does not continue it; the same request fetches what is still missing. While the app stays open, losing the network pauses the fetch and regaining it continues it. Hessen is complete when every one of its Kacheln is in the Cache. Kacheln leave the device only when the whole Cache is deleted.
Remembering which Gebiet a download had claimed was rejected. That mark existed so removing one Gebiet could spare a Kachel still claimed by another, and so a download could resume when the app opened. Selective removal and resume-on-open are both dropped.
Supersedes [ADR 0002](0002-cached-tiles-follow-downloaded-gebiete.md) and the resume-on-open and delete-retention sentences of [ADR 0001](0001-offline-pwa-prepared-tiles.md).