Update src/odoo_data_flow/import_threaded.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: bosd

src/odoo_data_flow/import_threaded.py

@@ -505,8 +505,8 @@ def _safe_convert_field_value(  # noqa: C901
                 else:
                     # Non-integer float - leave as-is to let Odoo handle it
                     return str_value
-            elif str_value.lstrip("-").isdigit():
-                # Integer string like "1", "-5"
+            elif str_value.lstrip("+-").isdigit():
+                # Integer string like "1", "-5", or "+5"
                 return int(str_value)
             else:
                 # Non-numeric string - leave as-is