feat: delete last voucher, notes field, schema cache fix (#230)

* feat: delete last voucher, notes field, schema cache fix

Address three customer feedback items from William (wigu.se):

1. Delete last voucher per series (Fortnox model):
   - New `delete_last_voucher` RPC with full safety checks (last-in-series,
     open period, no references, owner/admin only)
   - Session variable bypass for immutability/retention/line triggers
   - Full JSONB audit trail (BFNAR 2013:2 behandlingshistorik)
   - DELETE endpoint + UI with confirmation dialogs
   - Storno restoration when deleting a reversal entry

2. Notes/comment field on vouchers:
   - `notes` column on journal_entries (always-editable internal metadata)
   - Immutability trigger updated to allow notes-only updates on posted entries
   - PATCH endpoint, inline-edit UI on detail page, form textarea

3. Schema cache fix:
   - NOTIFY pgrst applied to production (immediate fix)
   - Retroactive migration + CLAUDE.md migration rule added

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: address Greptile review — tighten trigger, lock voucher sequence

P1: The notes-only exception in enforce_journal_entry_immutability was
too broad — it only checked 7 verifikation fields, allowing silent
mutation of correction_of_id, reverses_id, reversed_by_id, committed_at,
and user_id on posted entries. Now guards all metadata fields; only
notes and updated_at may differ.

P2: Lock voucher_sequences row FOR UPDATE before the MAX(voucher_number)
check in delete_last_voucher to serialise against concurrent
commit_journal_entry calls, preventing voucher number gaps.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

components/bookkeeping/JournalEntryForm.tsx

@@ -4,6 +4,7 @@ import { useState, useEffect, useCallback } from 'react'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
+import { Textarea } from '@/components/ui/textarea'
 import { Label } from '@/components/ui/label'
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
 import { useToast } from '@/components/ui/use-toast'
@@ -45,6 +46,7 @@ interface Props {
   initialLines?: FormLine[]
   initialDate?: string
   initialDescription?: string
+  initialNotes?: string
   sourceType?: JournalEntrySourceType
   sourceId?: string
   submitUrl?: string
@@ -59,6 +61,7 @@ export default function JournalEntryForm({
   initialLines,
   initialDate,
   initialDescription,
+  initialNotes,
   sourceType,
   sourceId,
   submitUrl,
@@ -70,6 +73,7 @@ export default function JournalEntryForm({
   const [selectedPeriod, setSelectedPeriod] = useState('')
   const [entryDate, setEntryDate] = useState(initialDate ?? new Date().toISOString().split('T')[0])
   const [description, setDescription] = useState(initialDescription ?? '')
+  const [notes, setNotes] = useState(initialNotes ?? '')
   const [lines, setLines] = useState<FormLine[]>(
     initialLines ?? [{ ...BLANK_LINE }, { ...BLANK_LINE }]
   )
@@ -90,7 +94,7 @@ export default function JournalEntryForm({
 
   const isUploading = uploadedFiles.some((f) => f.status === 'uploading')
 
-  const hasContent = description !== '' ||
+  const hasContent = description !== '' || notes !== '' ||
     lines.some(l => l.account_number !== '' || l.debit_amount !== '' || l.credit_amount !== '') ||
     uploadedFiles.length > 0
   useUnsavedChanges(hasContent)
@@ -285,6 +289,7 @@ export default function JournalEntryForm({
         source_type: sourceType ?? 'manual',
         source_id: sourceId,
         voucher_series: voucherSeries || 'A',
+        notes: notes || undefined,
         lines: entryLines,
       }),
     })
@@ -330,6 +335,7 @@ export default function JournalEntryForm({
       setShowReview(false)
       // Reset form
       setDescription('')
+      setNotes('')
       setUploadedFiles([])
       setLines([{ ...BLANK_LINE }, { ...BLANK_LINE }])
       setEntryCurrency('SEK')
@@ -386,6 +392,17 @@ export default function JournalEntryForm({
             placeholder="Verifikationstext..."
           />
         </div>
+        <div className={embedded ? 'hidden' : 'col-span-full'}>
+          <Label>Intern anteckning <span className="text-muted-foreground font-normal">(valfritt)</span></Label>
+          <Textarea
+            value={notes}
+            onChange={(e) => setNotes(e.target.value)}
+            placeholder="T.ex. anledning till bokning, referens till mejl, etc."
+            className="mt-1 resize-none"
+            rows={2}
+            maxLength={2000}
+          />
+        </div>
         {!embedded && (
           <div>
             <Label>Serie</Label>
@@ -720,6 +737,7 @@ export default function JournalEntryForm({
           periodName={periods.find((p) => p.id === selectedPeriod)?.name || ''}
           entryDate={entryDate}
           description={description}
+          notes={notes || undefined}
           voucherSeries={!embedded ? voucherSeries : undefined}
           lines={lines}
           totalDebit={totalDebit}