diff --git a/app/api/bookkeeping/journal-entries/[id]/commit/__tests__/route.test.ts b/app/api/bookkeeping/journal-entries/[id]/commit/__tests__/route.test.ts
index 97dd8b2d..194a4419 100644
--- a/app/api/bookkeeping/journal-entries/[id]/commit/__tests__/route.test.ts
+++ b/app/api/bookkeeping/journal-entries/[id]/commit/__tests__/route.test.ts
@@ -29,6 +29,15 @@ vi.mock('@/lib/bookkeeping/engine', () => ({
   commitEntry: (...args: unknown[]) => mockCommitEntry(...args),
 }))
 
+vi.mock('@/lib/logger', () => ({
+  createLogger: () => ({
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+    child: vi.fn().mockReturnThis(),
+  }),
+}))
+
 import { POST } from '../route'
 
 describe('POST /api/bookkeeping/journal-entries/[id]/commit', () => {
@@ -78,7 +87,7 @@ describe('POST /api/bookkeeping/journal-entries/[id]/commit', () => {
       'company-1',
       'user-1',
       'entry-1',
-      'manual'
+      'user_accept'
     )
   })
 
diff --git a/app/api/bookkeeping/journal-entries/[id]/commit/route.ts b/app/api/bookkeeping/journal-entries/[id]/commit/route.ts
index 1d478c16..c063cc02 100644
--- a/app/api/bookkeeping/journal-entries/[id]/commit/route.ts
+++ b/app/api/bookkeeping/journal-entries/[id]/commit/route.ts
@@ -5,9 +5,12 @@ import { bookkeepingErrorResponse } from '@/lib/bookkeeping/errors'
 import { ensureInitialized } from '@/lib/init'
 import { requireCompanyId } from '@/lib/company/context'
 import { requireWritePermission } from '@/lib/auth/require-write'
+import { createLogger } from '@/lib/logger'
 
 ensureInitialized()
 
+const log = createLogger('api.bookkeeping.commit')
+
 export async function POST(
   request: Request,
   { params }: { params: Promise<{ id: string }> }
@@ -26,11 +29,18 @@ export async function POST(
   const companyId = await requireCompanyId(supabase, user.id)
 
   try {
-    const posted = await commitEntry(supabase, companyId, user.id, id, 'manual')
+    const posted = await commitEntry(supabase, companyId, user.id, id, 'user_accept')
     return NextResponse.json({ data: posted })
   } catch (err) {
     const typed = bookkeepingErrorResponse(err)
     if (typed) return typed
+    // Untyped error path: engine logging didn't fire, so log here.
+    log.error('commit endpoint failed (untyped)', err as Error, {
+      companyId,
+      userId: user.id,
+      entityType: 'journal_entry',
+      entityId: id,
+    })
     return NextResponse.json(
       { error: err instanceof Error ? err.message : 'Failed to commit entry' },
       { status: 400 }
diff --git a/lib/bookkeeping/__tests__/voucher-atomicity.test.ts b/lib/bookkeeping/__tests__/voucher-atomicity.test.ts
index 561904f6..1960cf24 100644
--- a/lib/bookkeeping/__tests__/voucher-atomicity.test.ts
+++ b/lib/bookkeeping/__tests__/voucher-atomicity.test.ts
@@ -6,6 +6,15 @@ vi.mock('@/lib/events', () => ({
   eventBus: { emit: vi.fn().mockResolvedValue([]) },
 }))
 
+vi.mock('@/lib/logger', () => ({
+  createLogger: () => ({
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+    child: vi.fn().mockReturnThis(),
+  }),
+}))
+
 import { commitEntry, getNextVoucherNumber, createJournalEntry } from '../engine'
 import { BookkeepingDatabaseError } from '../errors'
 
diff --git a/lib/bookkeeping/engine.ts b/lib/bookkeeping/engine.ts
index 4151df85..048a17cf 100644
--- a/lib/bookkeeping/engine.ts
+++ b/lib/bookkeeping/engine.ts
@@ -1,5 +1,6 @@
 import type { SupabaseClient } from '@supabase/supabase-js'
 import { eventBus } from '@/lib/events'
+import { createLogger } from '@/lib/logger'
 import {
   AccountsNotInChartError,
   BookkeepingDatabaseError,
@@ -17,6 +18,8 @@ import type {
   JournalEntryLine,
 } from '@/types'
 
+const log = createLogger('bookkeeping.engine')
+
 /**
  * Validate that a set of journal entry lines is balanced (debits = credits)
  */
@@ -228,6 +231,17 @@ export async function createDraftEntry(
     .single()
 
   if (entryError || !entry) {
+    log.error('insert journal_entries draft failed', entryError ?? new Error('no row returned'), {
+      operation: 'create_draft_entry',
+      companyId,
+      userId,
+      entityType: 'journal_entry',
+      fiscalPeriodId: input.fiscal_period_id,
+      sourceType: input.source_type,
+      pgCode: (entryError as { code?: string } | null)?.code,
+      pgDetails: (entryError as { details?: string } | null)?.details,
+      pgHint: (entryError as { hint?: string } | null)?.hint,
+    })
     throw new BookkeepingDatabaseError('create_draft_entry', entryError?.message)
   }
 
@@ -239,7 +253,30 @@ export async function createDraftEntry(
     .insert(lineInserts)
 
   if (linesError) {
-    await supabase.from('journal_entries').update({ status: 'cancelled' }).eq('id', entry.id)
+    log.error('insert journal_entry_lines failed', linesError, {
+      operation: 'create_entry_lines',
+      companyId,
+      userId,
+      entityType: 'journal_entry',
+      entityId: entry.id,
+      lineCount: lineInserts.length,
+      pgCode: (linesError as { code?: string }).code,
+      pgDetails: (linesError as { details?: string }).details,
+      pgHint: (linesError as { hint?: string }).hint,
+    })
+    const { error: cancelError } = await supabase
+      .from('journal_entries')
+      .update({ status: 'cancelled' })
+      .eq('id', entry.id)
+    if (cancelError) {
+      log.error('orphan draft cleanup failed (phantom draft remains)', cancelError, {
+        operation: 'create_entry_lines.cleanup',
+        companyId,
+        entityType: 'journal_entry',
+        entityId: entry.id,
+        pgCode: (cancelError as { code?: string }).code,
+      })
+    }
     throw new BookkeepingDatabaseError('create_entry_lines', linesError.message)
   }
 
@@ -285,6 +322,17 @@ export async function commitEntry(
   })
 
   if (commitError) {
+    log.error('commit_journal_entry RPC failed', commitError, {
+      operation: 'commit_entry',
+      companyId,
+      userId,
+      entityType: 'journal_entry',
+      entityId: entryId,
+      commitMethod: commitMethod ?? null,
+      pgCode: (commitError as { code?: string }).code,
+      pgDetails: (commitError as { details?: string }).details,
+      pgHint: (commitError as { hint?: string }).hint,
+    })
     throw new BookkeepingDatabaseError('commit_entry', commitError.message)
   }
 
@@ -331,13 +379,28 @@ export async function createJournalEntry(
     // before failing downstream, immutability trigger blocks draft→cancelled
     // on a posted row anyway — the filter just avoids firing the trigger.
     try {
-      await supabase
+      const { error: cancelError } = await supabase
         .from('journal_entries')
         .update({ status: 'cancelled' })
         .eq('id', draft.id)
         .eq('status', 'draft')
-    } catch {
-      // Swallow rollback failure — surface the original commit error
+      if (cancelError) {
+        log.error('orphan draft cleanup failed (phantom draft remains)', cancelError, {
+          operation: 'create_journal_entry.cleanup',
+          companyId,
+          entityType: 'journal_entry',
+          entityId: draft.id,
+          pgCode: (cancelError as { code?: string }).code,
+        })
+      }
+    } catch (cleanupErr) {
+      // Surface the original commit error, but don't lose the cleanup signal.
+      log.error('orphan draft cleanup threw (phantom draft remains)', cleanupErr as Error, {
+        operation: 'create_journal_entry.cleanup',
+        companyId,
+        entityType: 'journal_entry',
+        entityId: draft.id,
+      })
     }
     throw commitError
   }