significant refactor/cleanup

endpoints/constructors.py

@@ -64,6 +64,9 @@ class ValidTopKarmaRequest(BaseModel):
 LastFM
 """
 
+class LastFMException(Exception):
+    pass
+
 class ValidArtistSearchRequest(BaseModel):
     """
     - **a**: artist name
@@ -81,17 +84,17 @@ class ValidArtistSearchRequest(BaseModel):
 class ValidAlbumDetailRequest(BaseModel):
     """
     - **a**: artist name
-    - **a2**: album/release name (as sourced from here/LastFM)
+    - **release**: album/release name (as sourced from here/LastFM)
     """
 
     a: str
-    a2: str
+    release: str
 
     class Config: # pylint: disable=missing-class-docstring
         schema_extra = {
             "example": {
                 "a": "eminem",
-                "a2": "houdini"
+                "release": "houdini"
                 }
             }