fix: force Chile timezone for API calls and fix status mapping to resolve 500 errors

backend/app/services/mercado_publico.py

@@ -3,7 +3,7 @@ import httpx
 from typing import List, Optional, Dict, Any
 from app.config import settings
 from app.schemas.tender import Tender, TenderItem
-from datetime import datetime
+from datetime import datetime, timedelta, timezone
 
 # Global semaphore to avoid "peticiones simultáneas" error from MP API
 mp_api_semaphore = asyncio.Semaphore(1)
@@ -171,9 +171,19 @@ async def _fetch(params: Dict[str, str], retries: int = 3) -> List[Tender]:
     return []
 
 async def get_active_tenders() -> List[Tender]:
-    """Fetch tenders active today."""
-    today = datetime.now().strftime("%d%m%Y")
-    return await _fetch({"fecha": today})
+    """Fetch tenders active today in Chile (UTC-4)."""
+    # Force Chile time (UTC-4)
+    chile_tz = timezone(timedelta(hours=-4))
+    today = datetime.now(chile_tz).strftime("%d%m%Y")
+    results = await _fetch({"fecha": today})
+    
+    # Fallback to yesterday if today is empty (common early in the morning)
+    if not results:
+        yesterday = (datetime.now(chile_tz) - timedelta(days=1)).strftime("%d%m%Y")
+        print(f"ℹ️ Today ({today}) is empty, falling back to yesterday ({yesterday})")
+        results = await _fetch({"fecha": yesterday})
+    
+    return results
 
 async def get_tenders_by_date(date_ddmmaaaa: str) -> List[Tender]:
     """Fetch tenders for a specific date (ddmmaaaa)."""
@@ -201,7 +211,12 @@ async def get_tenders_by_filters(
             params["fecha"] = datetime.now().strftime("%d%m%Y")
 
     if status:
-        params["estado"] = status
+        # Map friendly status to MP codes
+        # 'activas' is usually handled by not specifying a closed status or by specific date
+        if status == "activas":
+            pass # Default behavior for date-based fetch is often active/recent ones
+        else:
+            params["estado"] = status
     if org_code:
         params["CodigoOrganismo"] = org_code
     if provider_code:

backend/app/services/mercado_publico_oc.py

@@ -3,7 +3,7 @@ import httpx
 from typing import List, Optional, Dict, Any
 from app.config import settings
 from app.schemas.oc import PurchaseOrder, OCItem
-from datetime import datetime
+from datetime import datetime, timedelta, timezone
 
 # Global semaphore to avoid "peticiones simultáneas" error from MP API
 mp_api_semaphore = asyncio.Semaphore(1)
@@ -125,7 +125,9 @@ async def get_oc_by_code(code: str) -> Optional[PurchaseOrder]:
 
 async def get_ocs_by_date(date: str, status: str = "todos") -> List[PurchaseOrder]:
     params = {"estado": status}
-    today_str = datetime.now().strftime("%d%m%Y")
+    chile_tz = timezone(timedelta(hours=-4))
+    today_str = datetime.now(chile_tz).strftime("%d%m%Y")
+    
     if date is None or (date == today_str and status == "todos"):
         return await _fetch_oc({"fecha": today_str})