Improve root schema upgrade procedure about b2share

[defnull]

So, there is currently no update path for existing instances? Thanks for the warning.

[defnull]

Any news on this one? Upgrading an existing instance fails with:

b2share_1        | INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
b2share_1        | INFO  [alembic.runtime.migration] Will assume transactional DDL.
b2share_1        | Load root schemas.
b2share_1        | LOADING root schemas from "/eudat/b2share/b2share/modules/schemas/root_schemas".
b2share_1        | READING schema from "root_schema_v0.json"
b2share_1        | Traceback (most recent call last):
b2share_1        |   File "/usr/local/bin/b2share", line 33, in <module>
b2share_1        |     sys.exit(load_entry_point('b2share', 'console_scripts', 'b2share')())
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/core.py", line 716, in __call__
b2share_1        |     return self.main(*args, **kwargs)
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/flask/cli.py", line 345, in main
b2share_1        |     return AppGroup.main(self, *args, **kwargs)
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/core.py", line 696, in main
b2share_1        |     rv = self.invoke(ctx)
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1060, in invoke
b2share_1        |     return _process_result(sub_ctx.command.invoke(sub_ctx))
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1060, in invoke
b2share_1        |     return _process_result(sub_ctx.command.invoke(sub_ctx))
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/core.py", line 889, in invoke
b2share_1        |     return ctx.invoke(self.callback, **ctx.params)
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/core.py", line 534, in invoke
b2share_1        |     return callback(*args, **kwargs)
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func
b2share_1        |     return f(get_current_context(), *args, **kwargs)
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/flask/cli.py", line 229, in decorator
b2share_1        |     return __ctx.invoke(f, *args, **kwargs)
b2share_1        |   File "/usr/local/lib/python3.6/site-packages/click/core.py", line 534, in invoke
b2share_1        |     return callback(*args, **kwargs)
b2share_1        |   File "/eudat/b2share/b2share/modules/upgrade/cli.py", line 45, in run
b2share_1        |     upgrade_to_last_version(verbose)
b2share_1        |   File "/eudat/b2share/b2share/modules/upgrade/api.py", line 86, in upgrade_to_last_version
b2share_1        |     upgrade.run(failed_migration=last_failure, verbose=verbose)
b2share_1        |   File "/eudat/b2share/b2share/modules/upgrade/api.py", line 48, in decorator
b2share_1        |     f(*args, **kwargs)
b2share_1        |   File "/eudat/b2share/b2share/modules/upgrade/api.py", line 235, in run
b2share_1        |     raise e
b2share_1        |   File "/eudat/b2share/b2share/modules/upgrade/api.py", line 215, in run
b2share_1        |     step.run(alembic, verbose)
b2share_1        |   File "/eudat/b2share/b2share/modules/upgrade/upgrades/common.py", line 91, in schemas_init
b2share_1        |     load_root_schemas(cli=True, verbose=verbose, ignore_mismatches=True)
b2share_1        |   File "/eudat/b2share/b2share/modules/schemas/helpers.py", line 239, in load_root_schemas
b2share_1        |     os.path.join(root_schemas_dir, filename)),
b2share_1        | b2share.modules.schemas.errors.RootSchemaAlreadyExistsError: 400: Bad Request

Is there documentation available on how to properly upgrade an existing instance?