Study: Add default description example.

src/Model/Study.py

@@ -112,6 +112,8 @@ class Study(SQLModel):
         else:
             self._init_db_file(self.filename, is_new=True)
 
+        self.commit()
+
         # Save
         self.last_save_date = datetime.now()
         self._save(progress=progress)
@@ -235,7 +237,7 @@ class Study(SQLModel):
         if version[0] == self._version:
             return True
 
-        logger.info("Update database")
+        logger.debug("Update database")
 
         if self._update_submodel(version[0]):
             self.execute(