add lastactive to schema to allow deletion of users

src/schemas/database.py

@@ -1,8 +1,10 @@
 USERS = """CREATE TABLE IF NOT EXISTS users (
 id INTEGER PRIMARY KEY,
 username TEXT NOT NULL,
-usermail TEXT NOT NULL);
+usermail TEXT NOT NULL,
+lastActive TEXT);
 """  # id == matrikelnr,
+#matrikelnr TEXT NOT NULL,
 MEDIA = """CREATE TABLE IF NOT EXISTS media (
 id INTEGER PRIMARY KEY AUTOINCREMENT,
 signature TEXT NOT NULL,