start: rewrite the database layer using a freaking ORM

+ start ditching in-mem stores
+ move main db table to a new name
+ experiments!

app/models/artist.py

@@ -23,6 +23,12 @@ class ArtistMinimal:
         if self.artisthash == "5a37d5315e":
             self.name = "Juice WRLD"
 
+    def to_json(self):
+        return {
+            "name": self.name,
+            "artisthash": self.artisthash,
+        }
+
 
 @dataclass(slots=True)
 class Artist(ArtistMinimal):