Initial commit: mini-erp (backend FastAPI + frontend React/Vite)

Base para el flujo de ramas por cliente.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

mini-backend/core/hana.py

@@ -0,0 +1,44 @@
+import os
+import logging
+from contextlib import contextmanager
+from typing import Iterator
+
+from dotenv import load_dotenv
+from fastapi import HTTPException
+from hdbcli import dbapi
+
+# ============================================================================
+load_dotenv(dotenv_path=".env")
+
+HANA_HOST = os.getenv("HANA_HOST", "")
+HANA_PORT = int(os.getenv("HANA_PORT", 30015))
+HANA_USER = os.getenv("HANA_USER", "")
+HANA_PASSWORD = os.getenv("HANA_PASSWORD", "")
+HANA_SCHEMA = os.getenv("HANA_SCHEMA", "")
+
+logger = logging.getLogger(__name__)
+
+# ============================================================================
+@contextmanager
+def hana_connection() -> Iterator[dbapi.Connection]:
+    """
+    Abre una conexión a SAP HANA para un query puntual (reportes Jinja/HTML)
+    y la cierra al salir del bloque `with`.
+    """
+    try:
+        conn = dbapi.connect(
+            address=HANA_HOST,
+            port=HANA_PORT,
+            user=HANA_USER,
+            password=HANA_PASSWORD,
+            currentSchema=HANA_SCHEMA,
+        )
+    except Exception as exc:
+        logger.error(f"Error al conectar con HANA: {exc}")
+        raise HTTPException(status_code=500, detail=f"No se pudo conectar con la base de datos: {exc}")
+
+    try:
+        yield conn
+    finally:
+        conn.close()
+# ============================================================================