Fixing errors and danger zone

app/services/danger_zone.py

@@ -16,12 +16,9 @@ from app.models.fit import Fit, FitNote
 from app.models.imported_part import ImportedPart
 from app.models.iso_thread import IsoThread
 from app.models.manufacturer import Manufacturer
-from app.models.part_colour import PartColour
-from app.models.part_type import PartType
 from app.models.scope_info import ScopeInfo
 from app.models.scope_model import ScopeModel
 from app.models.static_connection import StaticConnection
-from app.models.sub_part_type import SubPartType
 from app.models.unc_thread import UncThread
 
 # Children before the RESTRICT-protected reference tables they point to.