Update authentication system, database models, and UI components

database.py

@@ -1,14 +1,33 @@
 # database.py — SQLModel engine/session for PostgreSQL
 
 from sqlmodel import create_engine, Session, SQLModel
+from contextlib import contextmanager
 import os
 
+# Debug messages disabled
+
 POSTGRES_URL = os.getenv("DATABASE_URL", "postgresql://d2s:kuTy4ZKs2VcjgDh6@localhost:5432/dictastream")
-engine = create_engine(POSTGRES_URL, echo=False)
+engine = create_engine(POSTGRES_URL, echo=False)  # Disable echo for production
 
 # SQLAlchemy Base class for models
 Base = SQLModel
 
+@contextmanager
 def get_db():
-    with Session(engine) as session:
+    """Session management context manager that ensures proper commit/rollback."""
+    session = Session(engine)
+    try:
+        # Debug messages disabled
         yield session
+        session.commit()
+        # Debug messages disabled
+    except Exception as e:
+        # Debug messages disabled
+        session.rollback()
+        raise
+    finally:
+        # Debug messages disabled
+        session.close()
+
+# For backward compatibility
+get_db_deprecated = get_db