Add the basics of geographic data distribution and get the tests to work.

data/database.py

@@ -222,6 +222,22 @@ class ImageStorage(BaseModel):
   uploading = BooleanField(default=True, null=True)
 
 
+class ImageStorageLocation(BaseModel):
+  name = CharField(unique=True, index=True)
+
+
+class ImageStoragePlacement(BaseModel):
+  storage = ForeignKeyField(ImageStorage)
+  location = ForeignKeyField(ImageStorageLocation)
+
+  class Meta:
+    database = db
+    indexes = (
+      # An image can only be placed in the same place once
+      (('storage', 'location'), True),
+    )
+
+
 class Image(BaseModel):
   # This class is intentionally denormalized. Even though images are supposed
   # to be globally unique we can't treat them as such for permissions and
@@ -341,4 +357,4 @@ all_models = [User, Repository, Image, AccessToken, Role, RepositoryPermission,
               RepositoryBuild, Team, TeamMember, TeamRole, Webhook, LogEntryKind, LogEntry,
               PermissionPrototype, ImageStorage, BuildTriggerService, RepositoryBuildTrigger,
               OAuthApplication, OAuthAuthorizationCode, OAuthAccessToken, NotificationKind,
-              Notification]
+              Notification, ImageStorageLocation, ImageStoragePlacement]