CVars: Einträge beim Löschen dazugehöriger Belege automatisch löschen

diff --git a/sql/Pg-upgrade2/delete_cvars_on_trans_deletion.sql b/sql/Pg-upgrade2/delete_cvars_on_trans_deletion.sql
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+-- @tag: delete_cvars_on_trans_deletion
+-- @description: Einträge in benutzerdefinierten Variablen löschen, deren Bezugsbelege gelöscht wurde
+-- @depends: release_3_1_0
+
+-- 1. Alle benutzerdefinierten Variablen löschen, für die es keine
+-- Einträge in den dazugehörigen Tabellen mehr gibt.
+
+-- 1.1. Alle CVars für Artikel selber (sub_module ist leer):
+DELETE FROM custom_variables
+WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = 'IC'))
+  AND (COALESCE(sub_module, '') = '')
+  AND (trans_id NOT IN (SELECT id FROM parts));
+
+-- 1.2. Alle CVars für Angebote/Aufträge, Lieferscheine, Rechnungen
+-- (sub_module gesetzt):
+DELETE FROM custom_variables
+WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = 'IC'))
+  AND (sub_module = 'orderitems')
+  AND (trans_id NOT IN (SELECT id FROM orderitems));
+
+DELETE FROM custom_variables
+WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = 'IC'))
+  AND (sub_module = 'delivery_order_items')
+  AND (trans_id NOT IN (SELECT id FROM delivery_order_items));
+
+DELETE FROM custom_variables
+WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = 'IC'))
+  AND (sub_module = 'invoice')
+  AND (trans_id NOT IN (SELECT id FROM invoice));
+
+-- 1.3. Alle CVars für Kunden/Lieferanten:
+DELETE FROM custom_variables
+WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = 'CT'))
+  AND (trans_id NOT IN (SELECT id FROM customer UNION SELECT id FROM vendor));
+
+-- 1.4. Alle CVars für Ansprechpersonen:
+DELETE FROM custom_variables
+WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = 'Contacts'))
+  AND (trans_id NOT IN (SELECT cp_id FROM contacts));
+
+-- 1.5. Alle CVars für Projekte:
+DELETE FROM custom_variables
+WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = 'Projects'))
+  AND (trans_id NOT IN (SELECT id FROM project));
+
+-- 2. Triggerfunktionen erstellen, die die benutzerdefinierten
+-- Variablen löschen.
+
+-- 2.1. Parametrisierte Backend-Funktion zum Löschen:
+CREATE OR REPLACE FUNCTION delete_custom_variables_with_sub_module(config_module TEXT, cvar_sub_module TEXT, old_id INTEGER)
+RETURNS BOOLEAN AS $$
+  BEGIN
+    DELETE FROM custom_variables
+    WHERE (config_id IN (SELECT id FROM custom_variable_configs WHERE module = config_module))
+      AND (COALESCE(sub_module, '') = cvar_sub_module)
+      AND (trans_id                 = old_id);
+
+    RETURN TRUE;
+  END;
+$$ LANGUAGE plpgsql;
+
+-- 2.2. Nun die Funktionen, die als Trigger aufgerufen wird und die
+-- entscheidet, wie genau zu löschen ist:
+CREATE OR REPLACE FUNCTION delete_custom_variables_trigger()
+RETURNS TRIGGER AS $$
+  BEGIN
+    IF (TG_TABLE_NAME IN ('orderitems', 'delivery_order_items', 'invoice')) THEN
+      PERFORM delete_custom_variables_with_sub_module('IC', TG_TABLE_NAME, old.id);
+    END IF;
+
+    IF (TG_TABLE_NAME = 'parts') THEN
+      PERFORM delete_custom_variables_with_sub_module('IC', '', old.id);
+    END IF;
+
+    IF (TG_TABLE_NAME IN ('customer', 'vendor')) THEN
+      PERFORM delete_custom_variables_with_sub_module('CT', '', old.id);
+    END IF;
+
+    IF (TG_TABLE_NAME = 'contacts') THEN
+      PERFORM delete_custom_variables_with_sub_module('Contacts', '', old.id);
+    END IF;
+
+    IF (TG_TABLE_NAME = 'project') THEN
+      PERFORM delete_custom_variables_with_sub_module('Projects', '', old.id);
+    END IF;
+
+    RETURN old;
+  END;
+$$ LANGUAGE plpgsql;
+
+-- 3. Die eigentlichen Trigger erstellen:
+
+-- 3.1. orderitems
+DROP TRIGGER IF EXISTS orderitems_delete_custom_variables_after_deletion ON orderitems;
+
+CREATE TRIGGER orderitems_delete_custom_variables_after_deletion
+AFTER DELETE ON orderitems
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();
+
+-- 3.2. delivery_order_items
+DROP TRIGGER IF EXISTS delivery_order_items_delete_custom_variables_after_deletion ON delivery_order_items;
+
+CREATE TRIGGER delivery_order_items_delete_custom_variables_after_deletion
+AFTER DELETE ON delivery_order_items
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();
+
+-- 3.3. invoice
+DROP TRIGGER IF EXISTS invoice_delete_custom_variables_after_deletion ON invoice;
+
+CREATE TRIGGER invoice_delete_custom_variables_after_deletion
+AFTER DELETE ON invoice
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();
+
+-- 3.4. parts
+DROP TRIGGER IF EXISTS parts_delete_custom_variables_after_deletion ON parts;
+
+CREATE TRIGGER parts_delete_custom_variables_after_deletion
+AFTER DELETE ON parts
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();
+
+-- 3.5. customer
+DROP TRIGGER IF EXISTS customer_delete_custom_variables_after_deletion ON customer;
+
+CREATE TRIGGER customer_delete_custom_variables_after_deletion
+AFTER DELETE ON customer
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();
+
+-- 3.6. vendor
+DROP TRIGGER IF EXISTS vendor_delete_custom_variables_after_deletion ON vendor;
+
+CREATE TRIGGER vendor_delete_custom_variables_after_deletion
+AFTER DELETE ON vendor
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();
+
+-- 3.7. contacts
+DROP TRIGGER IF EXISTS contacts_delete_custom_variables_after_deletion ON contacts;
+
+CREATE TRIGGER contacts_delete_custom_variables_after_deletion
+AFTER DELETE ON contacts
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();
+
+-- 3.8. project
+DROP TRIGGER IF EXISTS project_delete_custom_variables_after_deletion ON project;
+
+CREATE TRIGGER project_delete_custom_variables_after_deletion
+AFTER DELETE ON project
+FOR EACH ROW EXECUTE PROCEDURE delete_custom_variables_trigger();