def test_create_db_instance_success():
    client = boto3.client("timestream-influxdb", region_name="us-east-1")

    response = client.create_db_instance(
        name="test-instance",
        password="password123",
        dbInstanceType="db.influx.medium",
        vpcSubnetIds=["subnet-0123456789abcdef0"],
        vpcSecurityGroupIds=["sg-0123456789abcdef0"],
        allocatedStorage=123,
    )

    def __getitem__(self, region_name: str) -> SERVICE_BACKEND:
        # Some services, like S3, used to be truly global - meaning one Backend serving all
        # Now that we support partitions (AWS, AWS-CN, AWS-GOV, etc), there will be one backend per partition
        # Because the concept of 'region' doesn't exist in a global service, we use the partition name to keep the backends separate
        # We used to use the term 'global' in lieu of a region name, and users may still use this
        # It should resolve to 'aws', to ensure consistency
        if region_name == "global":
            region_name = "aws"
        if region_name in self.keys():
            return super().__getitem__(region_name)
        # Create the backend for a specific region
        with backend_lock:
            if region_name in self.regions and region_name not in self.keys():
                super().__setitem__(
                    region_name, self.backend(region_name, account_id=self.account_id)
                )
            if region_name not in self.regions and allow_unknown_region():
                super().__setitem__(
                    region_name, self.backend(region_name, account_id=self.account_id)
                )
>       return super().__getitem__(region_name)
E       KeyError: 'aws'

moto/core/base_backend.py:306: KeyError
============================================================= short test summary info =============================================================
FAILED tests/test_timestreaminfluxdb/test_timestreaminfluxdb.py::test_create_db_instance_success - KeyError: 'aws'

==Current Implementation Status==
[ ] create_db_instance
[ ] create_db_parameter_group
[ ] delete_db_instance
[ ] get_db_instance
[ ] get_db_parameter_group
[ ] list_db_instances
[ ] list_db_parameter_groups
[ ] list_tags_for_resource
[ ] tag_resource
[ ] untag_resource
[ ] update_db_instance
=================================
Select Operation: create_db_instance
        Initializing service    timestream-influxdb
        creating        moto/timestreaminfluxdb
        creating        moto/timestreaminfluxdb/models.py
        creating        moto/timestreaminfluxdb/exceptions.py
        creating        moto/timestreaminfluxdb/__init__.py
        creating        moto/timestreaminfluxdb/responses.py
        creating        moto/timestreaminfluxdb/urls.py
        skip creating   tests/test_timestreaminfluxdb
        creating        tests/test_timestreaminfluxdb/__init__.py
        creating        tests/test_timestreaminfluxdb/test_server.py
        creating        tests/test_timestreaminfluxdb/test_timestreaminfluxdb.py
        inserting code  moto/timestreaminfluxdb/responses.py
        inserting code  moto/timestreaminfluxdb/models.py
        inserting code  tests/test_timestreaminfluxdb/test_timestreaminfluxdb.py
Updating backend index...

Please select another operation, or Ctrl-X/Ctrl-C to cancel.

Remaining steps after development is complete:
- Run scripts/implementation_coverage.py,


Traceback (most recent call last):
  File "/Users/jlim/moto/scripts/scaffold.py", line 697, in <module>
    main()
  File "/Users/jlim/moto/.venv/lib/python3.11/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jlim/moto/.venv/lib/python3.11/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/Users/jlim/moto/.venv/lib/python3.11/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jlim/moto/.venv/lib/python3.11/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jlim/moto/scripts/scaffold.py", line 666, in main
    operation = select_operation(service)
                ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jlim/moto/scripts/scaffold.py", line 92, in select_operation
    implemented, operation_names = get_operations(service_name)
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jlim/moto/scripts/scaffold.py", line 109, in get_operations
    moto_client, _name = get_moto_implementation(service_name)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jlim/moto/scripts/implementation_coverage.py", line 20, in get_moto_implementation
    else backends[0]["global"]
         ~~~~~~~~~~~^^^^^^^^^^
  File "/Users/jlim/moto/moto/core/base_backend.py", line 306, in __getitem__
    return super().__getitem__(region_name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'aws'
(.venv) jlim@603e5f5a8790 moto % 

regions = boto3.session.Session().get_available_regions("timestream-influxdb")
assert regions == []