Remove unused columns and set up for prefix column

bot/migrations/V3__perms_and_config_changes.sql

@@ -0,0 +1,15 @@
+-- Revision Version: V3
+-- Revises: V2
+-- Creation Date: 2024-01-23 08:41:08.795638 UTC
+-- Reason: perms and config changes
+
+-- Remove this column as it was never used
+ALTER TABLE IF EXISTS guild_config DROP COLUMN locked;
+
+-- Also in lieu with permissions based commands, 
+-- we don't need to store perms levels on users
+ALTER TABLE IF EXISTS user_config DROP COLUMN permission_level;
+
+-- Allow for custom prefixes to be stored. This is simply setup work
+-- for another feature
+ALTER TABLE IF EXISTS guild_config ADD COLUMN prefix TEXT[];