--- /dev/null
+-- @tag: periodic_invoices_send_email
+-- @description: Wiederkehrende Rechnungen automatisch per E-Mail verschicken
+-- @depends: release_3_4_0
+ALTER TABLE periodic_invoices_configs ADD COLUMN send_email BOOLEAN;
+ALTER TABLE periodic_invoices_configs ADD COLUMN email_recipient_contact_id INTEGER;
+ALTER TABLE periodic_invoices_configs ADD COLUMN email_recipient_address TEXT;
+ALTER TABLE periodic_invoices_configs ADD COLUMN email_sender TEXT;
+ALTER TABLE periodic_invoices_configs ADD COLUMN email_subject TEXT;
+ALTER TABLE periodic_invoices_configs ADD COLUMN email_body TEXT;
+
+UPDATE periodic_invoices_configs SET send_email = FALSE;
+
+ALTER TABLE periodic_invoices_configs ALTER COLUMN send_email SET DEFAULT FALSE;
+ALTER TABLE periodic_invoices_configs ALTER COLUMN send_email SET NOT NULL;
+
+ALTER TABLE periodic_invoices_configs
+ADD FOREIGN KEY (email_recipient_contact_id) REFERENCES contacts (cp_id)
+ON DELETE SET NULL;