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* fix(invoices): write migrated invoice rows through one locking RPC so two writers cannot double them The row-completion pass (#2291) and the migration wizard both wrote invoice_items for migrated sales invoices with check-then-insert across separate statements and nothing serializing them per invoice; the pass also wrote the header VAT split in a third statement, so "rows landed, header did not" was reachable and never revisited. Adds complete_invoice_rows (SECURITY DEFINER, FOR UPDATE on the invoice scoped to the company, inserts only when the invoice still has no rows, optional header split in the same transaction, returns wrote) and routes both writers through it: the pass one call per invoice (wrote = false is skipped, not completed), the wizard one call per invoice in small concurrent groups. Unknown row keys and partial headers are refused rather than dropped. Grants: revoked from PUBLIC and anon, kept for authenticated (membership gate in the body) and service_role. pg test proves the invariant (first call writes, second returns wrote = false with rows and header unchanged), the rollback of rows on a failing header, every refusal, the grants and two-connection serialization. Closes #2313 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019SaJfqNi4VmsG8FMKq99G6 * fix(invoices): complete_invoice_rows requires the row's tax facts instead of defaulting vat_rate to 25 Review finding on #2340: COALESCE(r.vat_rate, 25) let a row without a rate land with a fabricated 25 % (ML 17 kap 24 § p.9). Both writers always send vat_rate, line_total, vat_amount and description, so the defaults were never needed and only hid a bug. The RPC now refuses a row missing any of the four (absent or JSON null) with MISSING_REQUIRED naming the column; sort_order, quantity, unit and line_type keep their table defaults since none states a tax fact. The rate's value is deliberately not restricted to the Swedish set: 0 (omvänd skattskyldighet, export) and foreign rates (OSS) are legitimate on a migrated row, and the pg test pins both as accepted. Migration edited in place: unshipped, preview branches only. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> --------- Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com> Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>