Schema rewrite to split up the schema.rs file.

backend/migrations/2022-05-28-142526_gamenight participants/down.sql

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+-- This file should undo anything in `up.sql`
+
+drop table gamenight_participants;

backend/migrations/2022-05-28-142526_gamenight participants/up.sql

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+-- Your SQL goes here
+
+create table gamenight_participants (
+    gamenight_id UUID NOT NULL,
+    user_id UUID NOT NULL,
+    CONSTRAINT FK_gamenight_id FOREIGN KEY (gamenight_id) REFERENCES gamenight(id) ON DELETE CASCADE,
+    CONSTRAINT FK_user_id FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+    PRIMARY KEY(gamenight_id, user_id)
+)