Update schemas and resolve some warnings

migrations/20240630150936_dashboard_preferences.sql

@@ -1,3 +1,7 @@
+-- Tables no longer needed as old dashboard is decomm.
+DROP TABLE guild_users;
+DROP TABLE events;
+
 ALTER TABLE users ADD COLUMN `reset_inputs_on_create` BOOLEAN NOT NULL DEFAULT 0;
 ALTER TABLE users ADD COLUMN `use_browser_timezone` BOOLEAN NOT NULL DEFAULT 1;
 ALTER TABLE users ADD COLUMN `dashboard_color_scheme` ENUM('system', 'light', 'dark') NOT NULL DEFAULT 'system';
@@ -7,4 +11,14 @@ ALTER TABLE users DROP COLUMN `patreon`;
 ALTER TABLE users DROP COLUMN `name`;
 
 ALTER TABLE users DROP PRIMARY KEY, ADD PRIMARY KEY (`user`);
+
+ALTER TABLE todos DROP CONSTRAINT todos_ibfk_5, MODIFY COLUMN user_id BIGINT UNSIGNED;
+UPDATE todos SET user_id = (SELECT user FROM users WHERE id = user_id);
+ALTER TABLE todos ADD CONSTRAINT todos_user_fk FOREIGN KEY (user_id) REFERENCES users(user);
+
+ALTER TABLE reminders DROP CONSTRAINT reminders_ibfk_2, MODIFY COLUMN set_by BIGINT UNSIGNED;
+UPDATE reminders SET set_by = (SELECT user FROM users WHERE id = set_by);
+ALTER TABLE reminders ADD CONSTRAINT reminder_user_fk FOREIGN KEY (set_by) REFERENCES users(user);
+
+ALTER TABLE users DROP COLUMN `id`;
 ALTER TABLE users RENAME COLUMN `user` TO `id`;