fix(import): resolve duplicate article + order_items repopulation on retry

Two production bugs from VENDING (order 485224762, 2026-04-22):

1. Oracle: ORA-20000 when a GoMag order contains a kit SKU whose expansion
   includes CODMAT X plus a second item with SKU=X. Two article-insert
   call-sites in PACK_IMPORT_COMENZI bypassed merge_or_insert_articol —
   line 622 (NOM_ARTICOLE fallback) and line 538 (kit discount line).
   Both now use merge_or_insert_articol for consistent dedup semantics.
   Regression test added in test_complete_import.py covering the exact
   kit-plus-direct scenario.

2. SQLite: retry_service._download_and_reimport refreshed orders row but
   never repopulated order_items. Combined with mark_order_deleted_in_roa
   (which wipes items), any retry/resync left the UI showing "Niciun
   articol" despite successful Oracle import. Retry now rebuilds items
   from the fresh GoMag download on both success and error paths,
   mirroring sync_service.

Includes scripts/backfill_order_items.py — one-shot recovery for orders
already in this bad state. Reads settings, re-fetches from GoMag,
rewrites order_items without touching Oracle or order status.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/backfill_order_items.py

@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+"""One-shot recovery: re-populate SQLite `order_items` for orders where the
+table was wiped (e.g. DELETED_IN_ROA → retry flow, before the retry items fix).
+
+Reads settings from SQLite, downloads orders from GoMag API for a ~14-day window
+around the order date, finds the target order, rebuilds the items rows.
+
+Does NOT touch Oracle. Does NOT change order status / id_comanda.
+
+Usage (inside the venv, on the prod server):
+    python scripts/backfill_order_items.py 485224762
+    python scripts/backfill_order_items.py 485224762 485224763  # multiple
+"""
+import asyncio
+import os
+import sys
+import tempfile
+from datetime import datetime, timedelta
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
+
+from api.app.services import sqlite_service, gomag_client, order_reader, validation_service
+from api.app import database
+
+
+async def _backfill_one(order_number: str, app_settings: dict, use_oracle: bool) -> dict:
+    detail = await sqlite_service.get_order_detail(order_number)
+    if not detail:
+        return {"ok": False, "msg": f"#{order_number}: nu e in SQLite"}
+
+    order_data = detail["order"]
+    existing_items = len(detail["items"])
+    order_date_str = order_data.get("order_date") or ""
+
+    try:
+        order_date = datetime.fromisoformat(order_date_str.replace("Z", "+00:00")).date()
+    except (ValueError, AttributeError):
+        order_date = datetime.now().date() - timedelta(days=1)
+
+    days_back = max((datetime.now().date() - order_date).days + 2, 2)
+
+    with tempfile.TemporaryDirectory() as tmp:
+        await gomag_client.download_orders(
+            tmp,
+            days_back=days_back,
+            api_key=app_settings.get("gomag_api_key"),
+            api_shop=app_settings.get("gomag_api_shop"),
+            limit=200,
+        )
+        orders, _ = order_reader.read_json_orders(json_dir=tmp)
+        target = next((o for o in orders if str(o.number) == str(order_number)), None)
+
+    if not target:
+        return {"ok": False, "msg": f"#{order_number}: nu e in GoMag (fereastra {days_back}z)"}
+
+    validation = {"mapped": set(), "direct": set()}
+    if use_oracle:
+        skus = {item.sku for item in target.items if item.sku}
+        id_gestiune = app_settings.get("id_gestiune", "")
+        id_gestiuni = [int(g.strip()) for g in id_gestiune.split(",") if g.strip()] if id_gestiune else None
+        try:
+            validation = await asyncio.to_thread(
+                validation_service.validate_skus, skus, None, id_gestiuni
+            )
+        except Exception as e:
+            print(f"  [WARN] validate_skus a esuat, mapping_status default='direct': {e}")
+
+    items_data = [
+        {
+            "sku": item.sku, "product_name": item.name,
+            "quantity": item.quantity, "price": item.price,
+            "baseprice": item.baseprice, "vat": item.vat,
+            "mapping_status": "mapped" if item.sku in validation["mapped"] else "direct",
+            "codmat": None, "id_articol": None, "cantitate_roa": None,
+        }
+        for item in target.items
+    ]
+
+    await sqlite_service.add_order_items(order_number, items_data)
+    return {
+        "ok": True,
+        "msg": f"#{order_number}: {len(items_data)} items scrise (era {existing_items})",
+    }
+
+
+async def main(order_numbers: list[str]):
+    app_settings = await sqlite_service.get_app_settings()
+
+    use_oracle = False
+    try:
+        database.init_oracle()
+        use_oracle = True
+        print("Oracle conectat — mapping_status va fi calculat corect.")
+    except Exception as e:
+        print(f"Oracle indisponibil ({e}) — mapping_status default 'direct'.")
+
+    try:
+        for on in order_numbers:
+            result = await _backfill_one(on, app_settings, use_oracle)
+            tag = "OK  " if result["ok"] else "FAIL"
+            print(f"[{tag}] {result['msg']}")
+    finally:
+        if use_oracle:
+            try:
+                database.close_oracle()
+            except Exception:
+                pass
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: python scripts/backfill_order_items.py <order_number> [<order_number>...]")
+        sys.exit(1)
+
+    asyncio.run(main(sys.argv[1:]))