Added functions for adding, deleting and showing tickets

As said, functions got implemented. Also minor changes to migration
layout and dependencies

migrations/20260422094706_ticket_table.sql

@@ -1,12 +1,10 @@
-CREATE TYPE category AS ENUM('Whiteboard Beamer', 'Internet', 'iPad Koffer', 'Apple TV', 'Docu Cam', 'Sonstiges')
-CREAYE TYPE status AS ENUM('ToDo', 'InProgress', 'Done', 'Archived')
 CREATE TABLE IF NOT EXISTS tickets (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    id INTEGER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
     category category NOT NULL DEFAULT 'Sonstiges',
     betreff VARCHAR(100),
-    description VARCHAR,
+    description TEXT,
     room SMALLINT,
     status status NOT NULL DEFAULT 'ToDo',
-    date TIMESTAMP,
+    date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     user_id SMALLINT
 );