fix(missing-skus): reconcile stale false positives against Oracle

SKUs mapped externally (via SSH script or direct SQL) never triggered
resolve_missing_sku(), leaving them stuck as unresolved=0 indefinitely.
New reconcile_unresolved_missing_skus() revalidates ALL unresolved SKUs
against Oracle at sync, rescan, and CSV import time. Fail-soft on Oracle
down. Clears the 7 prod false positives on next sync or manual rescan.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/app/services/sync_service.py

@@ -468,6 +468,11 @@ async def run_sync(id_pol: int = None, id_sectie: int = None, run_id: str = None
                     if resolved_count:
                         _log_line(run_id, f"Auto-resolved {resolved_count} previously missing SKUs")
 
+                # Reconcile stale unresolved SKUs that got mappings outside the current JSON batch
+                rec = await validation_service.reconcile_unresolved_missing_skus(conn=conn)
+                if rec["resolved"]:
+                    _log_line(run_id, f"Reconciliere: {rec['resolved']} SKU rezolvate suplimentar")
+
                 # Step 2d: Pre-validate prices for importable articles
                 if id_pol and (truly_importable or already_in_roa):
                     _update_progress("validation", "Validating prices...", 0, len(truly_importable))

api/app/services/validation_service.py

@@ -1,8 +1,39 @@
+import asyncio
 import logging
 from .. import database
+from . import sqlite_service
 
 logger = logging.getLogger(__name__)
 
+
+async def reconcile_unresolved_missing_skus(conn=None) -> dict:
+    """Revalidate all resolved=0 SKUs in missing_skus against Oracle.
+    Fail-soft: logs warning and returns zero if Oracle is unavailable.
+    Returns {"checked": N, "resolved": M, "error": str|None}.
+    """
+    db = await sqlite_service.get_sqlite()
+    try:
+        cursor = await db.execute("SELECT sku FROM missing_skus WHERE resolved = 0")
+        rows = await cursor.fetchall()
+    finally:
+        await db.close()
+
+    if not rows:
+        return {"checked": 0, "resolved": 0, "error": None}
+
+    unresolved_set = {row[0] for row in rows}
+
+    try:
+        result = await asyncio.to_thread(validate_skus, unresolved_set, conn)
+    except Exception as e:
+        logger.warning(f"reconcile_unresolved_missing_skus: Oracle unavailable — {e}")
+        return {"checked": len(unresolved_set), "resolved": 0, "error": str(e)}
+
+    resolved_set = result["mapped"] | result["direct"]
+    resolved_count = await sqlite_service.resolve_missing_skus_batch(resolved_set)
+    logger.info(f"reconcile_unresolved_missing_skus: checked={len(unresolved_set)}, resolved={resolved_count}")
+    return {"checked": len(unresolved_set), "resolved": resolved_count, "error": None}
+
 def check_orders_in_roa(min_date, conn) -> dict:
     """Check which orders already exist in Oracle COMENZI by date range.
     Returns: {comanda_externa: id_comanda} for all existing orders.