Adds an AdminPanel with currently active registration tokens.

backend/migrations/2022-06-04-141858_registration_tokens/down.sql

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+-- This file should undo anything in `up.sql`
+
+drop table registration_tokens;
+
+ALTER TABLE gamenight
+ALTER datetime TYPE VARCHAR;

backend/migrations/2022-06-04-141858_registration_tokens/up.sql

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+-- Your SQL goes here
+
+create table registration_tokens (
+    id UUID PRIMARY KEY,
+    token CHARACTER(32) NOT NULL,
+    single_use BOOLEAN NOT NULL,
+    expires TIMESTAMPTZ
+);
+
+ALTER TABLE gamenight
+ALTER datetime TYPE TIMESTAMPTZ using datetime::timestamp;