fixup! Issue #635: cleaner job manager API for initializing the job d…

…atabase

openeo/extra/job_management.py

@@ -259,7 +259,7 @@ def _make_resilient(connection):
         connection.session.mount("http://", HTTPAdapter(max_retries=retries))
 
     @staticmethod
-    def __normalize_df__(df: pd.DataFrame) -> pd.DataFrame:
+    def _normalize_df(df: pd.DataFrame) -> pd.DataFrame:
         """
         Normalize given pandas dataframe (creating a new one):
         ensure we have the required columns.
@@ -713,7 +713,7 @@ def initialize_from_df(self, df: pd.DataFrame):
         # TODO: option to provide custom MultiBackendJobManager subclass with custom normalize?
         if self.exists():
             raise RuntimeError(f"Job database {self!r} already exists.")
-        df = MultiBackendJobManager.__normalize_df__(df)
+        df = MultiBackendJobManager._normalize_df(df)
         self.persist(df)
         # Return self to allow chaining with constructor.
         return self