Add timestamps and comment fields to clients. This updates the gravity database to version 11.

Signed-off-by: DL6ER <dl6er@dl6er.de>

advanced/Scripts/database_migration/gravity/10_to_11.sql

@@ -0,0 +1,16 @@
+.timeout 30000
+
+BEGIN TRANSACTION;
+
+ALTER TABLE client ADD COLUMN date_added INTEGER;
+ALTER TABLE client ADD COLUMN date_modified INTEGER;
+ALTER TABLE client ADD COLUMN comment TEXT;
+
+CREATE TRIGGER tr_client_update AFTER UPDATE ON client
+    BEGIN
+      UPDATE client SET date_modified = (cast(strftime('%s', 'now') as int)) WHERE id = NEW.id;
+    END;
+
+UPDATE info SET value = 11 WHERE property = 'version';
+
+COMMIT;