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feat(bokslut): calculate and book overavskrivningar (2150/8850) (#1379)

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Add an automatic excess-depreciation calculator for machinery and
equipment under IL 18 kap: 30-rule and 20-rule residuals (fiscal-period
aware for short and long years), ledger vs asset-register
reconciliation, fail-closed blocking states, and a signed proposal that
books via the dispositions flow (8853/2153). Releases of an over-target
reserve are mandatory and not overridable; increases are optional and
capped server-side.

Fixes #323

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Mattsson
2026-08-03 17:25:30 +02:00
committed by GitHub
co-authored by Claude Fable 5
parent 16fbcefbbc
commit 6782da3e9e
11 changed files with 1229 additions and 43 deletions
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DECISIONS.md
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@@ -747,3 +747,4 @@ One line per decision: `[YYYY-MM-DD] <decision>: <why>`. Appended by agents and
[2026-08-03] Shared format contracts centralised in lib/invariants/ (org number, BAS account number, ISO date, fiscal year), each with its rationale recorded next to the rule. Trigger: four Skatteverket/Bolagsverket-bound export paths (KU10, AGI, SRU redovisare, iXBRL preflight) each had their own idea of a valid organisationsnummer, so a company stored with a space or in 12-digit form could file AGI all year and fail at the arsredovisning deadline. normalizeOrgNumber moved from lib/company-lookup/ and isSaneDateString from lib/utils.ts; both old paths re-export. The iXBRL check-digit verdict is warn, not error: we do not block a statutory filing on a Luhn assumption unverified against a primary source. KU10 12-digit passthrough pinned by test, not changed (open domain question). ROT/RUT brf_org_number left alone: different documented contract. Ratchet guard 8 holds the remaining 114 inline copies.
[2026-08-03] CI gained a pg-upgrade job: apply the merge-base schema, seed real rows, apply ONLY the PR migrations, assert the data survived. Rationale: pg-real applies all 548 migrations to an EMPTY database, so a NOT NULL / CHECK / unique index / backfill passes against zero rows and can still break prod. Proven locally against supabase/postgres:15.8.1.060 with three bad migrations: a CHECK violating an ore-level row and a NOT NULL on a populated column both exit 0 on empty and exit 3 on seeded. Base migrations are read from the merge-base git tree, not the working tree, so a PR that edits a shipped migration still surfaces here.
[2026-08-03] Issue #323 automatic excess depreciation is limited to reconciled IL 18 machinery and equipment with linear book depreciation and posts 8853/2153: buildings, intangible assets, and the 25 percent rest-value method follow separate rules, so calculation fails closed on an incomplete register or unposted planned depreciation.