Added stubs for classes and cogs, performed a cleanup, added more database indexes

cogs/stage.py

@@ -0,0 +1,14 @@
+from discord.ext.commands import Cog
+
+from classes.pycord_bot import PycordBot
+
+
+class Stage(Cog):
+    """Cog with event stage management commands."""
+
+    def __init__(self, bot: PycordBot):
+        self.bot: PycordBot = bot
+
+
+def setup(bot: PycordBot) -> None:
+    bot.add_cog(Stage(bot))