frontend añadido y backend de creacion de notas

backend/db/session.py

@@ -0,0 +1,36 @@
+# backend/db/session.py
+import os
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from urllib.parse import quote_plus
+from dotenv import load_dotenv
+
+# Cargar variables de entorno (.env) desde backend/.env
+load_dotenv(dotenv_path=os.path.join(os.path.dirname(__file__), "..", ".env"))
+
+DB_USER = os.getenv("DB_USER")
+DB_PASSWORD = quote_plus(os.getenv("DB_PASSWORD"))
+DB_HOST = os.getenv("DB_HOST")
+DB_PORT = os.getenv("DB_PORT", "55455")
+DB_NAME = os.getenv("DB_NAME")
+
+DATABASE_URL = (
+    f"postgresql+psycopg2://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}"
+)
+
+# Crear engine
+engine = create_engine(
+    DATABASE_URL,
+    pool_size=5,
+    max_overflow=10,
+    future=True,
+    echo=False,  # pon True para ver las queries en consola
+)
+
+# Fábrica de sesiones
+SessionLocal = sessionmaker(
+    bind=engine,
+    autoflush=False,
+    expire_on_commit=False,
+    future=True,
+)