debug: add detailed LDAP authentication logging with error traceback

backend/routers/users.py

@@ -23,10 +23,13 @@ def get_ldap_config():
 def authenticate_ldap(username, password):
     config = get_ldap_config()
     if not config.get("ldap_enabled"):
+        log.debug("LDAP: LDAP is disabled in config")
         return None
-        
+
+    log.debug(f"LDAP: Config loaded: server_uri={config.get('server_uri')}, base_dn={config.get('base_dn')}")
     try:
         server = ldap3.Server(config["server_uri"], use_ssl=config.get("use_tls", False), get_info=ldap3.ALL)
+        log.debug(f"LDAP: Server object created: {config['server_uri']}")
         user_dn = config["user_template"].format(username=username)
         log.debug(f"LDAP: Attempting bind for DN: {user_dn}")
 
@@ -91,7 +94,9 @@ def authenticate_ldap(username, password):
             
         return assigned_role
     except Exception as e:
-        log.debug(f"LDAP: Auth Error: {str(e)}")
+        log.error(f"LDAP: Auth Error: {type(e).__name__}: {str(e)}")
+        import traceback
+        log.debug(f"LDAP: Full traceback: {traceback.format_exc()}")
         return None
 pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")