Deleted cards are removed locally. If you sync with cloud backup, recovery is available from the last snapshot in Settings > Backups.
Yes. Open the note in Notes page, use Edit, then change module metadata and save. The card is moved automatically.
Strict combinations (year + difficulty + type) reduce matching questions. Relax one filter to widen the question pool.
In quiz mode, use the report action in the question header. Include module, year, and expected correction for fast review.