initial commit

server/app/models/tgd.py

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+from pydantic import BaseModel
+
+from app.models.event import EventSeries
+from app.models.group import Group
+from app.models.musician import Musician
+
+
+class TheGrapefruitsDuo(BaseModel):
+    version: str
+    group: Group
+    musicians: list[Musician]
+    events: list[EventSeries]