fix im p0 backend issues

server/db/mysql/tenant_groups.go

@@ -445,7 +445,8 @@ func (a *adapter) TenantGroupInvitationAccept(id t.TenantID, invitationID string
 		return &inv, nil
 	}
 	var deletedAt sql.NullTime
-	err = tx.QueryRowxContext(ctx, "SELECT DeletedAt FROM subscriptions WHERE Topic=? AND User=?", inv.Topic, uid.String()).Scan(&deletedAt)
+	err = tx.QueryRowxContext(ctx, "SELECT deletedat FROM im_subscriptions WHERE topic=? AND userid=?",
+		inv.Topic, decodeUID(uid)).Scan(&deletedAt)
 	if err != nil && err != sql.ErrNoRows {
 		return nil, err
 	}