Full restore on SQLite: take the write lock first, so another writer is waited for instead of "database is locked"
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SQLite in WAL mode starts a transaction as a reader; a write from another process between our first read and our first write makes our first write fail at once, whatever the busy timeout. The SQLite full-restore test now runs a second writer alongside the restore.
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@@ -462,8 +462,12 @@ in README "Known limitations":
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bij #22 en 2026-10-29 op `main` na de merge van 1.0.0): de restore stopt meteen na het
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aanzetten van de onderhoudsmodus. Niet altijd, dus een tweede proces dat op hetzelfde moment
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de database gebruikt (cron, een webverzoek of de opstart van de container). Kan ook bij een
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echte restore naar SQLite gebeuren. Uitzoeken wie de lock vasthoudt; dan wachten en opnieuw
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proberen (busy timeout) of eerst de andere schrijvers stoppen.
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echte restore naar SQLite gebeuren. Oorzaak (2026-10-29): SQLite (WAL) begint een transactie
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als lezer; schrijft een ander proces tussen ons eerste lezen en ons eerste schrijven, dan
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faalt dat schrijven direct (geen wachttijd helpt). In CI was dat de installer, die
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"installed" zet en daarna nog seconden doorschrijft. Nu neemt de restore eerst het
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schrijfslot en wacht hij op de ander; de SQLite-test draait met een tweede schrijver
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ernaast — **klaar** (2026-10-29).
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- **DR-tests over databasegrenzen** (besluit 2026-10-20; productie nc01 draait PostgreSQL): na
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de MariaDB→PostgreSQL-fout (tellers, rc5) elke overstap in de integratietest (`to-pgsql`,
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`to-mysql`, `to-sqlite`, ook in CI). Volle DR-tests met echte data: vóór 1.0.0 de S3-simulatie
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