schema fix + repo + dto

Co-authored-by: [Mahgs] <maxoerter@gmx.de>
Co-authored-by: Christoph <tobi@urpost.de>

mysql/db/entrypoint/schema.sql

@@ -6,3 +6,10 @@ CREATE TABLE event
     event_type VARCHAR(36),
     event_payload JSON
 );
+
+CREATE TABLE invite
+(
+    invite_id INT PRIMARY KEY AUTO_INCREMENT,
+    group_id VARCHAR(36) NOT NULL,
+    invite_link VARCHAR(36) NOT NULL
+);