DSMS Stufe 3 — making the parent_cid chain useful end-to-end.
Gateway (dsms-gateway):
- /api/v1/documents/{cid}/history alias added next to the legacy
/documents/{cid}/history (history endpoint itself was already there,
just under an inconsistent prefix).
- NEW /api/v1/documents/{cid_a}/diff/{cid_b}: fetches both packages from
IPFS, computes a metadata diff (per-field old/new), and renders a
unified text diff for utf-8 payloads. Binary payloads return only
metadata diff with a "binary — compare via rendered export" note.
- 4 new pytest cases (mocking ipfs_cat): text diff, binary fallback,
fetch error, history chain depth — all green.
Frontend (admin-compliance):
- CIDHistoryModal: lazy-loads /dsms/documents/:cid/history, renders the
version chain as a vertical timeline, marks the AKTUELL entry, and
per-step exposes a "Diff zu V<n>" button that loads + renders the diff
inline (metadata table + unified text diff in a monospace panel).
- AuditTimelinePage: existing CID badge now sits next to a "Verlauf
anzeigen" link that opens the modal. Handles both Python's plain-CID
audit values and the Go techfile flow's JSON envelope {cid, filename,
size} via extractCID() helper.
This makes "show me how this CE-Akte changed between V2 and V3"
self-service in the UI instead of a curl-against-IPFS workflow.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Benjamin Admin
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