normalize data po number to pr number and fix logic to fill field PO number

internal/database/migrations/20260529085659_normalize_po_number_to_pr_pattern.down.sql

@@ -0,0 +1,8 @@
+-- IRREVERSIBLE migration: po_number lama (counter-based) tidak di-backup
+-- saat UP karena user secara eksplisit pilih "tanpa backup table".
+-- Down ini hanya raise notice supaya operator sadar harus restore dari
+-- DB-level backup terpisah kalau memang perlu rollback.
+DO $$
+BEGIN
+  RAISE NOTICE 'WARNING: Migration 20260529143940_normalize_po_number_to_pr_pattern is irreversible. Original counter-based PO numbers were not backed up. Restore from DB-level backup if rollback is required.';
+END $$;

internal/database/migrations/20260529085659_normalize_po_number_to_pr_pattern.up.sql

@@ -0,0 +1,87 @@
+BEGIN;
+
+-- ============================================================
+-- Normalize purchases.po_number agar mengikuti pr_number (swap prefix).
+-- Contoh: pr_number='PR-LTI-0050' -> po_number='PO-LTI-0050'
+--
+-- Konteks: sebelumnya pr_number dan po_number punya counter sequential
+-- terpisah (lihat purchase.repository.go NextPrNumber / NextPoNumber yang
+-- dihapus seiring migration ini), sehingga selalu diverge. Setelah
+-- perubahan code (ApproveManagerPurchase derive PO dari PR), historis
+-- perlu di-backfill supaya konsisten.
+--
+-- Juga update expenses.po_number (snapshot dari expense_bridge.go)
+-- supaya konsisten dengan purchases.
+--
+-- Constraint uq_purchases_po_number adalah NOT DEFERRABLE (per-row check),
+-- jadi single UPDATE bulk gagal di swap-conflict (contoh: row A mau jadi
+-- 'PO-LTI-0700' tapi row B masih punya 'PO-LTI-0700' -> error 23505).
+-- Solusi: capture target ke temp table, NULL dulu, baru set nilai derived.
+--
+-- IRREVERSIBLE: nilai po_number lama (counter-based) tidak di-backup.
+-- Kalau ada kegagalan di tengah, COMMIT tidak terjadi -> ROLLBACK otomatis.
+-- ============================================================
+
+-- 1. Capture target IDs (snapshot rencana update — sebelum perubahan apapun)
+CREATE TEMP TABLE _purchases_po_normalize_ids ON COMMIT DROP AS
+SELECT id
+FROM purchases
+WHERE po_number IS NOT NULL
+  AND pr_number LIKE 'PR-LTI-%'
+  AND po_number <> REPLACE(pr_number, 'PR-LTI-', 'PO-LTI-');
+
+-- 2. Update expenses DULU — join via current po_number masih valid sebelum step 3-4
+UPDATE expenses e
+SET po_number = REPLACE(p.pr_number, 'PR-LTI-', 'PO-LTI-')
+FROM purchases p
+JOIN _purchases_po_normalize_ids n ON n.id = p.id
+WHERE e.po_number = p.po_number
+  AND e.po_number IS NOT NULL
+  AND e.po_number <> '';
+
+-- 3. NULL-kan purchases.po_number untuk target — lepas constraint conflict
+UPDATE purchases
+SET po_number = NULL
+WHERE id IN (SELECT id FROM _purchases_po_normalize_ids);
+
+-- 4. Set nilai derived dari pr_number (sekarang aman karena slot lama sudah NULL)
+UPDATE purchases p
+SET po_number = REPLACE(p.pr_number, 'PR-LTI-', 'PO-LTI-')
+FROM _purchases_po_normalize_ids n
+WHERE p.id = n.id;
+
+-- 5. Sanity check — fail (auto-rollback) kalau masih ada mismatch
+DO $$
+DECLARE
+  v_mismatch_purchases INT;
+  v_mismatch_expenses INT;
+  v_target_count INT;
+BEGIN
+  SELECT COUNT(*) INTO v_target_count FROM _purchases_po_normalize_ids;
+
+  SELECT COUNT(*) INTO v_mismatch_purchases
+  FROM purchases
+  WHERE po_number IS NOT NULL
+    AND pr_number LIKE 'PR-LTI-%'
+    AND po_number <> REPLACE(pr_number, 'PR-LTI-', 'PO-LTI-');
+
+  IF v_mismatch_purchases > 0 THEN
+    RAISE EXCEPTION 'Normalize failed: % purchases rows still have mismatched po_number', v_mismatch_purchases;
+  END IF;
+
+  SELECT COUNT(*) INTO v_mismatch_expenses
+  FROM expenses e
+  JOIN purchases p ON e.po_number = p.po_number
+  WHERE p.pr_number LIKE 'PR-LTI-%'
+    AND e.po_number IS NOT NULL
+    AND e.po_number <> ''
+    AND e.po_number <> REPLACE(p.pr_number, 'PR-LTI-', 'PO-LTI-');
+
+  IF v_mismatch_expenses > 0 THEN
+    RAISE EXCEPTION 'Normalize failed: % expenses rows still have mismatched po_number', v_mismatch_expenses;
+  END IF;
+
+  RAISE NOTICE 'Normalize complete: % purchases rows updated', v_target_count;
+END $$;
+
+COMMIT;

internal/modules/purchases/repositories/purchase.repository.go

@@ -24,7 +24,6 @@ type PurchaseRepository interface {
 	UpdateReceivingDetails(ctx context.Context, purchaseID uint, updates []PurchaseReceivingUpdate) error
 	DeleteItems(ctx context.Context, purchaseID uint, itemIDs []uint) error
 	NextPrNumber(ctx context.Context, tx *gorm.DB) (string, error)
-	NextPoNumber(ctx context.Context, tx *gorm.DB) (string, error)
 	BackfillProjectFlockKandang(ctx context.Context, purchaseID uint) error
 	SoftDeleteByProjectFlockKandangIDs(ctx context.Context, projectFlockKandangIDs []uint) error
 	GetItemsByProjectFlockID(ctx context.Context, projectFlockID uint) ([]entity.PurchaseItem, error)
@@ -369,9 +368,8 @@ func (r *PurchaseRepositoryImpl) NextPrNumber(ctx context.Context, tx *gorm.DB)
 	return r.generateSequentialNumber(ctx, tx, "pr_number", utils.PurchasePRNumberPrefix, utils.PurchaseNumberPadding)
 }
 
-func (r *PurchaseRepositoryImpl) NextPoNumber(ctx context.Context, tx *gorm.DB) (string, error) {
+// NOTE: NextPoNumber dihapus per migration 20260529143940 — po_number sekarang
-	return r.generateSequentialNumber(ctx, tx, "po_number", utils.PurchasePONumberPrefix, utils.PurchaseNumberPadding)
+// di-derive dari pr_number (swap prefix) via derivePoFromPr di purchase.service.go.
-}
 
 func (r *PurchaseRepositoryImpl) generateSequentialNumber(ctx context.Context, tx *gorm.DB, column, prefix string, padding int) (string, error) {
 	db := tx

internal/modules/purchases/services/purchase.service.go

@@ -779,8 +779,7 @@ func (s *purchaseService) ApproveManagerPurchase(c *fiber.Ctx, id uint, req *val
 	transactionErr := s.PurchaseRepo.DB().WithContext(c.Context()).Transaction(func(tx *gorm.DB) error {
 		updateData := map[string]any{}
 		if !hasExistingPO {
-			repoTx := rPurchase.NewPurchaseRepository(tx)
+			code, err := derivePoFromPr(purchase.PrNumber)
-			code, err := repoTx.NextPoNumber(c.Context(), tx)
 			if err != nil {
 				return err
 			}
@@ -2513,6 +2512,18 @@ func parseApprovalActionInput(raw string) (entity.ApprovalAction, error) {
 	}
 }
 
+// derivePoFromPr menghasilkan po_number dari pr_number dengan swap prefix.
+// Contoh: "PR-LTI-0050" -> "PO-LTI-0050". Mengembalikan error kalau pr_number
+// tidak diawali prefix standar — caller harus memastikan PR sudah valid.
+func derivePoFromPr(prNumber string) (string, error) {
+	trimmed := strings.TrimSpace(prNumber)
+	if !strings.HasPrefix(trimmed, utils.PurchasePRNumberPrefix) {
+		return "", fmt.Errorf("invalid pr_number %q: missing prefix %q", trimmed, utils.PurchasePRNumberPrefix)
+	}
+	suffix := strings.TrimPrefix(trimmed, utils.PurchasePRNumberPrefix)
+	return utils.PurchasePONumberPrefix + suffix, nil
+}
+
 func (s *purchaseService) rejectAndReload(
 	c *fiber.Ctx,
 	step approvalutils.ApprovalStep,