Bulk delete selected posts

Deletes only explicitly listed owned database records and their future schedules, across content groups. Hosted/external media is retained; storage is not reclaimed. Posts already published to social platforms are not deleted. Save platform IDs first if needed. The strict JSON body accepts only ids: 1–50 UUIDs, unique ignoring case; invalid JSON, unknown keys, and invalid IDs reject the entire request with 400 before content mutation. UUIDs are normalized to lowercase. HTTP 200 and success=true mean the batch was processed, not that every deletion succeeded. Results preserve input order. Missing/unowned records return indistinguishable 404 items; processing, pending video generation, unknown states, and concurrent changes return 409 items. Lookup or deletion failures return safe 500 items: deletion may be uncertain, so refresh before retrying. Processing is bounded to five concurrent records; no all-or-nothing transaction, filter deletion, or automatic retry.