Added gamenight owners and some ui and api functions to delete gamenights.

backend/migrations/2022-04-17-175115_user-system/up.sql

@@ -8,5 +8,12 @@ CREATE TABLE user (
 CREATE TABLE pwd (
     user_id INTEGER NOT NULL PRIMARY KEY,
     password TEXT NOT NULL,
-    FOREIGN KEY (user_id) REFERENCES user(id) ON DELETE CASCADE
-);
+    CONSTRAINT FK_UserId FOREIGN KEY (user_id) REFERENCES user(id) ON DELETE CASCADE
+);
+
+--Initialize default admin user, with password "gamenight!"
+INSERT INTO user (id, username, role)
+values(-1, 'admin', 'admin');
+
+insert INTO pwd (id, pwd)
+values(-1, '$argon2id$v=19$m=4096,t=3,p=1$zEdUjCAnZqd8DziYWzlFHw$YBLQhKvYIZBY43B8zM6hyBvLKuqTeh0EM5pKOfbWQSI');