Address Greptile review feedback on #4243.
- Cloud-mode link.updateMany / pixel.updateMany now filter where: { ..., deletedAt: null } so a previously soft-deleted row keeps its original deletion timestamp instead of being restamped with the current time.
- Pre-transaction findMany now selects deletedAt; the Redis invalidation list filters to only live slugs, avoiding harmless but wasted DEL calls for already-soft-deleted entries.
Note: the share.deleteMany cleanup still uses the broad entityId list (not filtered by deletedAt) so that orphan share rows of already-soft-deleted links/pixels are still cleaned up. Filtering the prefetch itself, as Greptile's exact suggestion proposed, would skip those shares while link.deleteMany still hard-deletes the rows, leaving orphan share rows behind. Verified empirically with a 3-scenario reproduction.