Add a UUID -> Flight database to Game.

This will be expanded with other types as needed.

game/db/__init__.py

@@ -0,0 +1,2 @@
+from .database import Database
+from .gamedb import GameDb

game/db/database.py

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+from typing import Generic, TypeVar
+from uuid import UUID
+
+T = TypeVar("T")
+
+
+class Database(Generic[T]):
+    def __init__(self) -> None:
+        self.objects: dict[UUID, T] = {}
+
+    def add(self, uuid: UUID, obj: T) -> None:
+        if uuid in self.objects:
+            raise KeyError(f"Object with UUID {uuid} already exists")
+        self.objects[uuid] = obj
+
+    def get(self, uuid: UUID) -> T:
+        return self.objects[uuid]
+
+    def remove(self, uuid: UUID) -> None:
+        del self.objects[uuid]

game/db/gamedb.py

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+from typing import TYPE_CHECKING
+
+from .database import Database
+
+if TYPE_CHECKING:
+    from game.ato import Flight
+
+
+class GameDb:
+    def __init__(self) -> None:
+        self.flights: Database[Flight] = Database()