Changed enums to string

String is easyer to decode and the sendable data in the frontend will be
limited.

migrations/20260422094706_ticket_table.sql

@@ -1,10 +1,10 @@
 CREATE TABLE IF NOT EXISTS tickets (
     id INTEGER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    category category NOT NULL DEFAULT 'Sonstiges',
+    category VARCHAR(20) NOT NULL DEFAULT 'Sonstiges',
     betreff VARCHAR(100),
     description TEXT,
     room SMALLINT,
-    status status NOT NULL DEFAULT 'ToDo',
+    status VARCHAR(15) NOT NULL DEFAULT 'ToDo',
     date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     user_id SMALLINT
 );