try to fix typing issue

src/firebolt/service/V1/base.py

@@ -1,11 +1,13 @@
-from typing import Optional
+from typing import TYPE_CHECKING, Optional
 
 from firebolt.client import ClientV1 as Client
-from firebolt.service.manager import ResourceManager
+
+if TYPE_CHECKING:
+    from firebolt.service.manager import ResourceManager
 
 
 class BaseService:
-    def __init__(self, resource_manager: ResourceManager):
+    def __init__(self, resource_manager: "ResourceManager"):
         self.resource_manager = resource_manager
 
     @property

src/firebolt/service/V1/region.py

@@ -1,14 +1,16 @@
-from typing import Dict, List
+from typing import TYPE_CHECKING, Dict, List
 
 from firebolt.model.V1.region import Region, RegionKey
-from firebolt.service.manager import ResourceManager
 from firebolt.service.V1.base import BaseService
 from firebolt.utils.urls import REGIONS_URL
 from firebolt.utils.util import cached_property
 
+if TYPE_CHECKING:
+    from firebolt.service.manager import ResourceManager
+
 
 class RegionService(BaseService):
-    def __init__(self, resource_manager: ResourceManager):
+    def __init__(self, resource_manager: "ResourceManager"):
         """
         Service to manage AWS regions (us-east-1, etc)
 

src/firebolt/service/manager.py

@@ -14,7 +14,14 @@
 )
 from firebolt.common import Settings
 from firebolt.db import connect
+from firebolt.service.V1.binding import BindingService
+from firebolt.service.V1.database import DatabaseService as DatabaseServiceV1
+from firebolt.service.V1.engine import EngineService as EngineServiceV1
 from firebolt.service.V1.provider import get_provider_id
+from firebolt.service.V1.region import RegionService
+from firebolt.service.V2.database import DatabaseService as DatabaseServiceV2
+from firebolt.service.V2.engine import EngineService as EngineServiceV2
+from firebolt.service.V2.instance_type import InstanceTypeService
 from firebolt.utils.util import fix_url_schema
 
 DEFAULT_TIMEOUT_SECONDS: int = 60 * 2
@@ -127,34 +134,25 @@ def __init__(
 
     def _init_services_v2(self) -> None:
         # avoid circular import
-        from firebolt.service.V2.database import DatabaseService
-        from firebolt.service.V2.engine import EngineService
-        from firebolt.service.V2.instance_type import InstanceTypeService
 
         # Cloud Platform Resources (AWS)
         self.instance_types = InstanceTypeService(resource_manager=self)
 
         # Firebolt Resources
-        self.databases = DatabaseService(resource_manager=self)
-        self.engines = EngineService(resource_manager=self)
+        self.databases = DatabaseServiceV2(resource_manager=self)
+        self.engines = EngineServiceV2(resource_manager=self)
 
         # Not applicable to V2
         self.provider_id = None
 
     def _init_services_v1(self) -> None:
-        # avoid circular import
-        from firebolt.service.V1.binding import BindingService
-        from firebolt.service.V1.database import DatabaseService
-        from firebolt.service.V1.engine import EngineService
-        from firebolt.service.V1.region import RegionService
-
         # Cloud Platform Resources (AWS)
         self.regions = RegionService(resource_manager=self)  # type: ignore
 
         # Firebolt Resources
         self.bindings = BindingService(resource_manager=self)  # type: ignore
-        self.engines = EngineService(resource_manager=self)  # type: ignore
-        self.databases = DatabaseService(resource_manager=self)  # type: ignore
+        self.engines = EngineServiceV1(resource_manager=self)  # type: ignore
+        self.databases = DatabaseServiceV1(resource_manager=self)  # type: ignore
 
         self.provider_id = get_provider_id(client=self._client)