fix: reduce diagnosticos batch 500→200, add start_from resume param

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

app/routes/envios.py

@@ -45,8 +45,11 @@ async def erp_sync_now(
 
 
 @router.post("/erp/sync-diagnosticos")
-async def erp_sync_diagnosticos(user: dict = Depends(get_current_user)):
-    """Migra los 12.422 diagnósticos CIE-10 de Firebird → WhatsApp en lotes de 500."""
+async def erp_sync_diagnosticos(
+    user: dict = Depends(get_current_user),
+    start_from: int = Query(default=0, ge=0, description="Índice desde el que reanudar"),
+):
+    """Migra los 12.422 diagnósticos CIE-10 de Firebird → WhatsApp en lotes de 200."""
     try:
         conn = get_connection()
         configs = {row["key"]: row["value"] for row in conn.execute("SELECT * FROM config").fetchall()}
@@ -72,14 +75,14 @@ async def erp_sync_diagnosticos(user: dict = Depends(get_current_user)):
 
         diagnosticos = [{"cod": r["COD_DIAG"], "concepto": r["CONCEPTO"]} for r in (rows or [])]
         total = len(diagnosticos)
-        batch_size = 500
+        batch_size = 200
         url = f"{wa_url}/api/lab/ingest_diagnosticos.php"
         headers = {"Content-Type": "application/json", "X-Lab-Key": wa_key}
 
         insertados = 0
         errores = []
         async with httpx.AsyncClient(timeout=60) as client:
-            for i in range(0, total, batch_size):
+            for i in range(start_from, total, batch_size):
                 lote = diagnosticos[i:i + batch_size]
                 try:
                     resp = await client.post(url, json={"rows": lote}, headers=headers)