feat(mappings): strict validation + silent CSV skip for missing CODMAT

Add Pydantic validators and service-level checks that reject empty SKU/CODMAT
on create/edit (400). CSV import now silently skips rows without CODMAT and
counts them in skipped_no_codmat instead of treating them as errors.

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

api/app/services/mapping_service.py

@@ -147,6 +147,10 @@ def get_mappings(search: str = "", page: int = 1, per_page: int = 50,
 
 def create_mapping(sku: str, codmat: str, cantitate_roa: float = 1, procent_pret: float = 100):
     """Create a new mapping. Returns dict or raises HTTPException on duplicate."""
+    if not sku or not sku.strip():
+        raise HTTPException(status_code=400, detail="SKU este obligatoriu")
+    if not codmat or not codmat.strip():
+        raise HTTPException(status_code=400, detail="CODMAT este obligatoriu")
     if database.pool is None:
         raise HTTPException(status_code=503, detail="Oracle unavailable")
 
@@ -229,6 +233,10 @@ def delete_mapping(sku: str, codmat: str):
 def edit_mapping(old_sku: str, old_codmat: str, new_sku: str, new_codmat: str,
                  cantitate_roa: float = 1, procent_pret: float = 100):
     """Edit a mapping. If PK changed, soft-delete old and insert new."""
+    if not new_sku or not new_sku.strip():
+        raise HTTPException(status_code=400, detail="SKU este obligatoriu")
+    if not new_codmat or not new_codmat.strip():
+        raise HTTPException(status_code=400, detail="CODMAT este obligatoriu")
     if database.pool is None:
         raise HTTPException(status_code=503, detail="Oracle unavailable")
 
@@ -283,23 +291,27 @@ def import_csv(file_content: str):
 
     reader = csv.DictReader(io.StringIO(file_content))
     created = 0
-    updated = 0
+    skipped_no_codmat = 0
     errors = []
 
     with database.pool.acquire() as conn:
         with conn.cursor() as cur:
             for i, row in enumerate(reader, 1):
+                sku = row.get("sku", "").strip()
+                codmat = row.get("codmat", "").strip()
+
+                if not sku:
+                    errors.append(f"Rând {i}: SKU lipsă")
+                    continue
+
+                if not codmat:
+                    skipped_no_codmat += 1
+                    continue
+
                 try:
-                    sku = row.get("sku", "").strip()
-                    codmat = row.get("codmat", "").strip()
                     cantitate = float(row.get("cantitate_roa", "1") or "1")
                     procent = float(row.get("procent_pret", "100") or "100")
 
-                    if not sku or not codmat:
-                        errors.append(f"Row {i}: missing sku or codmat")
-                        continue
-
-                    # Try update first, insert if not exists (MERGE)
                     cur.execute("""
                         MERGE INTO ARTICOLE_TERTI t
                         USING (SELECT :sku AS sku, :codmat AS codmat FROM DUAL) s
@@ -314,16 +326,14 @@ def import_csv(file_content: str):
                             (sku, codmat, cantitate_roa, procent_pret, activ, sters, data_creare, id_util_creare)
                             VALUES (:sku, :codmat, :cantitate_roa, :procent_pret, 1, 0, SYSDATE, -3)
                     """, {"sku": sku, "codmat": codmat, "cantitate_roa": cantitate, "procent_pret": procent})
-
-                    # Check if it was insert or update by rowcount
-                    created += 1  # We count total processed
+                    created += 1
 
                 except Exception as e:
-                    errors.append(f"Row {i}: {str(e)}")
+                    errors.append(f"Rând {i}: {str(e)}")
 
             conn.commit()
 
-    return {"processed": created, "errors": errors}
+    return {"processed": created, "skipped_no_codmat": skipped_no_codmat, "errors": errors}
 
 def export_csv():
     """Export all mappings as CSV string."""