fixed some migration issues and added generics for update and insert

internal/handlers/register.go

@@ -71,6 +71,12 @@ func Register(
 				if err != nil {
 					return false, errors.Wrap(err, "db.UpdateDiscordToken")
 				}
+				if shouldGrantAdmin(user, cfg.RBAC) {
+					err := ensureUserHasAdminRole(ctx, tx, user)
+					if err != nil {
+						return false, errors.Wrap(err, "ensureUserHasAdminRole")
+					}
+				}
 				return true, nil
 			}); !ok {
 				return