AppDbUpdater: Switch foreign keys off when heavily altering tables

Elwig/Resources/Sql/10-11.sql

@@ -22,10 +22,12 @@ CREATE TABLE payment_delivery_part_new (
 INSERT INTO payment_delivery_part_new (year, did, dpnr, avnr, net_amount, mod_abs, mod_rel)
 SELECT year, did, dpnr, avnr, net_amount, mod_abs, mod_rel
 FROM payment_delivery_part;
+PRAGMA foreign_keys = OFF;
 PRAGMA writable_schema = ON;
 DROP TABLE payment_delivery_part;
 ALTER TABLE payment_delivery_part_new RENAME TO payment_delivery_part;
 PRAGMA writable_schema = OFF;
+PRAGMA foreign_keys = ON;
 
 DROP TRIGGER IF EXISTS t_payment_delivery_part_i;
 CREATE TRIGGER t_payment_delivery_part_i