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1. text-artifacts-require-explicit-utf8-handling (Type B): to produktionshaendelser, samme sygdom - smiley double-encodet via HTTP-streng, og en Mode B-batch der skrev mojibake i tre CLAUDE.md fordi PS 5.1 laeser BOM-loese .ps1 som cp1252. Reglen: raa bytes ved transfer, eksplicit UTF-8 ved write, tekst-transformation i Python, grep for maerket foer commit. 2. log-writes-must-survive-rollback (Type B): fejl-logs skrevet i samme transaktion forsvinder ved rollback - loggen mister praecis de fejl den findes for. Isoleret session (StartSession -> insert + commit) er moensteret. Evidens: Wareco IC web-service-log 2026-07-02; havde tidligere kostet en udvikler det meste af en dag. 3. Skaerpelse af setup-doc-must-not-reference-unpromoted-stable-files: kanal-tilstand verificeres via git (ls-remote/klon), aldrig CDN; to sande observationer kan modsige hinanden naar verden flytter sig imellem dem - tidsstempl al kanal-evidens. Felt-verificeret af Conzept-sessionens selvkorrektion 2026-07-03. Foerste PR foedt direkte i QualityHub. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
64 lines
2.8 KiB
Markdown
64 lines
2.8 KiB
Markdown
---
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bc-version: [all]
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domain: architecture
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keywords: [logging, rollback, session, transaction, error-log, web-service, telemetry]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# Log writes must survive transaction rollback
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## Description
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The naive instinct when adding logging is to insert the log record inside
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the running transaction. That log has a fatal blind spot: when the operation
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ERRORS, the transaction rolls back — and takes the log entry with it. The
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result is a log that faithfully records every success and silently loses
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exactly the failures it exists to capture.
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Observed in production design (Wareco IC, 2026-07-02): a log of errors and
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duration per web-service call needed entries to persist even when the
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business transaction was rolled back. The correct pattern — writing the log
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from an ISOLATED SESSION so its commit is independent of the caller's
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transaction — had previously cost a developer most of a day to discover.
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## Rule
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A log whose purpose includes capturing FAILURES must write its entries in a
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transaction that is independent of the operation being logged:
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1. **Isolated session write:** start a separate session (`StartSession` on a
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codeunit that inserts the log record and commits) so the entry persists
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regardless of what happens to the caller's transaction.
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2. The log codeunit does ONE thing: insert + implicit commit. No business
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logic rides along in the isolated session — anything committed there
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escapes the caller's rollback by design.
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3. Duration/telemetry fields are captured in the caller and passed as
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parameters — the isolated session must not re-read state that the
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rollback may erase.
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4. Logs that only record successes (audit of committed work) may stay in the
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main transaction — this rule targets error/diagnostic logs specifically.
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## What NOT to do
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- Do not `Insert` the error-log record in the same transaction as the
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operation — the error you most need to see is the one that deletes it
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- Do not "fix" it with `Commit` before the risky call — a stray `Commit`
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breaks the caller's atomicity and violates posting-routine rules
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- Do not swallow errors to keep the log alive (`if Codeunit.Run then...`
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without re-raising) — the log must observe the failure, not suppress it
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## Signal to watch for
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A log table whose entries are inserted in the flow they measure, with no
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isolated-session writer — combined with any error path. In review: search
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callers of the log-insert for surrounding `Insert`/`Post` in the same
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transaction scope.
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## Message to developer
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When an in-transaction error log is found, explain: entries vanish on
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rollback, so the log is blind to failures; route the write through an
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isolated session (StartSession → insert+commit codeunit) with values passed
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as parameters.
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