Tobias C2 — DocumentBulkEditDTO carries @Size guards on tagNames (max 200
entries × 200 chars), receiverIds (max 200), and the three location strings
(max 255 chars each). Controller now uses @Valid on @RequestBody so they
fire. The 500-cap on documentIds stays as a controller-level check (typed
BULK_EDIT_TOO_MANY_IDS code, not generic VALIDATION_ERROR).
Markus #7 — replace fully-qualified type names inside DocumentService with
imports (DocumentBatchSummary, DocumentBulkEditDTO).
Markus #8 — @Transactional(readOnly = true) on findIdsForFilter and
batchMetadata. Both are pure read paths; the marker lets Hibernate skip
dirty-checking on the loaded entities.
Record conversion of DocumentBulkEditDTO (Markus #6 / Felix #3) deferred
to a follow-up — keeping @Data avoids 10+ test bodies that mutate the DTO
via setters; the inconsistency is documented in the DTO's class-level
Javadoc.
Refs #225, PR #331
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>