fix: serialize media publishing decisions

apps/api/app/routers/admin.py

@@ -15,12 +15,12 @@ from ..community_review import ExternalReviewError, map_observation, publish_obs
 from ..config import settings
 from ..dependencies import Db
 from ..importer import ImportAlreadyRunning, ImportSourceError, import_records
-from rf4_research.media_assets import publish_quality_upgrades, rollback_quality_upgrade
+from rf4_research.media_assets import preview_quality_upgrades, publish_quality_upgrades, rollback_quality_upgrade
 
-from ..media_catalog import KNOWN_MEDIA_ROLES, MEDIA_ROLES_BY_ENTITY, MEDIA_ROOT, review_assets, review_file
+from ..media_catalog import KNOWN_MEDIA_ROLES, MEDIA_ROLES_BY_ENTITY, MEDIA_ROOT, media_manifest_version, review_assets, review_file
 from ..models import CatchReport, CommunityImportRun, DataSource, ExternalObservation, Fish, ModerationEvent, ModerationStatus, OfficialRecordImport, SourceType, Waterbody
 from ..public_cache import public_cache
-from ..schemas import AdminCatchReportOut, AdminMediaDecision, AdminMediaReviewOut, AdminMediaRollback, AdminModerationHistoryOut, AdminSourceStatusOut, CatchReportCreated, ExternalAliasSuggestionOut, ExternalObservationAction, ExternalObservationBulkAction, ExternalObservationBulkDecision, ExternalObservationBulkMapping, ExternalObservationBulkResult, ExternalObservationDecision, ExternalObservationMapping, ExternalObservationOut, ExternalObservationPublished, ImportRunOut, ModerationBulkResult, ModerationBulkUpdate, ModerationUpdate
+from ..schemas import AdminCatchReportOut, AdminMediaDecision, AdminMediaPreview, AdminMediaReviewOut, AdminMediaRollback, AdminModerationHistoryOut, AdminSourceStatusOut, CatchReportCreated, ExternalAliasSuggestionOut, ExternalObservationAction, ExternalObservationBulkAction, ExternalObservationBulkDecision, ExternalObservationBulkMapping, ExternalObservationBulkResult, ExternalObservationDecision, ExternalObservationMapping, ExternalObservationOut, ExternalObservationPublished, ImportRunOut, ModerationBulkResult, ModerationBulkUpdate, ModerationUpdate
 from ..storage import delete_screenshot, signed_screenshot_url
 from ..time_utils import aware
 
@@ -35,6 +35,7 @@ def _admin(request: Request, db: Db, authorization: Annotated[str | None, Header
 @router.get("/api/v1/admin/media/catalog", response_model=list[AdminMediaReviewOut])
 def admin_media_catalog(
     _: Annotated[str, Depends(_admin)],
+    response: Response,
     entity_type: str | None = Query(None, pattern="^(fish|waterbody|tackle|reference)$"),
     status: str | None = Query(None, pattern="^(approved|upgrade_queued|upgrade_stored)$"),
     media_role: str | None = Query(None, pattern="^(waterbody_cover|waterbody_map|waterbody_depth_map|waterbody_screenshot|tackle_card|tackle_detail|rig_diagram|tackle_screenshot)$"),
@@ -46,6 +47,7 @@ def admin_media_catalog(
         raise HTTPException(status_code=422, detail="unknown media role")
     if media_role and (not entity_type or media_role not in MEDIA_ROLES_BY_ENTITY.get(entity_type, set())):
         raise HTTPException(status_code=422, detail="media role is incompatible with entity type")
+    response.headers["X-Media-Manifest-Version"] = str(media_manifest_version())
     return review_assets(entity_type, status, media_role, q.strip() if q else None)[offset:offset + limit]
 
 
@@ -58,6 +60,20 @@ def admin_media_asset(digest: str, _: Annotated[str, Depends(_admin)]) -> FileRe
     return FileResponse(path, media_type=media_type, headers={"Cache-Control": "private, no-store"})
 
 
+@router.post("/api/v1/admin/media/upgrades/preview")
+def admin_preview_media_upgrades(
+    payload: AdminMediaPreview,
+    _: Annotated[str, Depends(_admin)],
+) -> dict:
+    try:
+        return preview_quality_upgrades(
+            MEDIA_ROOT / "manifest.json", asset_ids=payload.asset_ids,
+            expected_version=payload.expected_version,
+        )
+    except ValueError as exc:
+        raise HTTPException(status_code=409, detail=str(exc)) from exc
+
+
 @router.post("/api/v1/admin/media/upgrades/publish")
 def admin_publish_media_upgrades(
     payload: AdminMediaDecision,
@@ -65,7 +81,10 @@ def admin_publish_media_upgrades(
 ) -> dict[str, int]:
     """Atomically publish all stored quality upgrades after an explicit decision."""
     try:
-        return publish_quality_upgrades(MEDIA_ROOT / "manifest.json", note=payload.note)
+        return publish_quality_upgrades(
+            MEDIA_ROOT / "manifest.json", note=payload.note,
+            asset_ids=payload.asset_ids, expected_version=payload.expected_version,
+        )
     except ValueError as exc:
         raise HTTPException(status_code=409, detail=str(exc)) from exc
 
@@ -74,11 +93,12 @@ def admin_publish_media_upgrades(
 def admin_rollback_media_upgrade(
     payload: AdminMediaRollback,
     _: Annotated[str, Depends(_admin)],
-) -> dict[str, str]:
+ ) -> dict:
     """Restore one superseded fallback while retaining the reviewed candidate."""
     try:
         return rollback_quality_upgrade(
-            MEDIA_ROOT / "manifest.json", asset_url=payload.asset_url, note=payload.note,
+            MEDIA_ROOT / "manifest.json", asset_id=payload.asset_id,
+            note=payload.note, expected_version=payload.expected_version,
         )
     except ValueError as exc:
         raise HTTPException(status_code=409, detail=str(exc)) from exc