backend: add todo about fault-tolerance and data consistency

backend/run/copr-change-storage

@@ -127,6 +127,16 @@ def main():
                     log.info("Skipping: %s", resultdir)
                     continue
 
+                # TODO Fault-tolerance and data consistency
+                # Errors when creating things in Pulp will likely happen
+                # (networking issues, unforseen Pulp validation, etc). We
+                # should figure out how to ensure that all RPMs were
+                # successfully uploaded, and if not, we know about it.
+                #
+                # We also need to make sure that no builds, actions, or cron,
+                # are currently writing into the results directory. Otherwise
+                # we can end up with incosystent data in Pulp.
+
                 full_name = "{0}/{1}".format(owner, subproject)
                 result = storage.init_project(full_name, chroot)
                 if not result: