feat: move ownership to member column instead of table column

migrations/2025-06-06-145916_guild_ownership_changes/down.sql

@@ -0,0 +1,14 @@
+-- This file should undo anything in `up.sql`
+ALTER TABLE guilds
+ADD COLUMN owner_uuid UUID REFERENCES users(uuid);
+
+UPDATE guilds g
+SET owner_uuid = gm.user_uuid
+FROM guild_members gm
+WHERE gm.guild_uuid = g.uuid AND gm.is_owner = TRUE;
+
+ALTER TABLE guilds
+ALTER COLUMN owner_uuid SET NOT NULL;
+
+ALTER TABLE guild_members
+DROP COLUMN is_owner;