chore(api): use fully qualified model names

api/libretime_api/core/models/auth.py

@@ -2,7 +2,10 @@ from django.db import models
 
 
 class UserToken(models.Model):
-    user = models.ForeignKey("User", on_delete=models.DO_NOTHING)
+    user = models.ForeignKey(
+        "core.User",
+        on_delete=models.DO_NOTHING,
+    )
     action = models.CharField(max_length=255)
     token = models.CharField(unique=True, max_length=40)
     created = models.DateTimeField()

api/libretime_api/core/models/preference.py

@@ -3,7 +3,7 @@ from django.db import models
 
 class Preference(models.Model):
     user = models.ForeignKey(
-        "User",
+        "core.User",
         on_delete=models.CASCADE,
         db_column="subjid",
         blank=True,

api/libretime_api/core/models/worker.py

@@ -21,7 +21,7 @@ class ThirdPartyTrackReference(models.Model):
 class CeleryTask(models.Model):
     task_id = models.CharField(max_length=256)
     track_reference = models.ForeignKey(
-        "ThirdPartyTrackReference",
+        "core.ThirdPartyTrackReference",
         on_delete=models.DO_NOTHING,
     )
     name = models.CharField(max_length=256, blank=True, null=True)