fix(indexer): full_rebuild par library ne supprime plus les thumbnails des autres libraries

cleanup_orphaned_thumbnails chargeait uniquement les book IDs de la library
en cours de rebuild, considérant les thumbnails des autres libraries comme
orphelins et les supprimant. La fonction charge désormais tous les book IDs
toutes libraries confondues.

Ajout d'un test de régression dans infra/smoke.sh qui vérifie que le
full_rebuild d'une library ne réduit pas le nombre de thumbnails des autres.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/indexer/src/analyzer.rs

@@ -388,16 +388,14 @@ pub async fn regenerate_thumbnails(
 }
 
 /// Delete orphaned thumbnail files (books deleted in full_rebuild get new UUIDs).
-pub async fn cleanup_orphaned_thumbnails(
-    state: &AppState,
-    library_id: Option<Uuid>,
-) -> Result<()> {
+pub async fn cleanup_orphaned_thumbnails(state: &AppState) -> Result<()> {
     let config = load_thumbnail_config(&state.pool).await;
 
+    // Load ALL book IDs across all libraries — we need the complete set to avoid
+    // deleting thumbnails that belong to other libraries during a per-library rebuild.
     let existing_book_ids: std::collections::HashSet<Uuid> = sqlx::query_scalar(
-        r#"SELECT id FROM books WHERE (library_id = $1 OR $1 IS NULL)"#,
+        r#"SELECT id FROM books"#,
     )
-    .bind(library_id)
     .fetch_all(&state.pool)
     .await
     .unwrap_or_default()

apps/indexer/src/job.rs

@@ -315,7 +315,7 @@ pub async fn process_job(
 
     // For full rebuild: clean up orphaned thumbnail files (old UUIDs)
     if is_full_rebuild {
-        analyzer::cleanup_orphaned_thumbnails(state, target_library_id).await?;
+        analyzer::cleanup_orphaned_thumbnails(state).await?;
     }
 
     // Phase 2: Analysis (extract page_count + thumbnails for new/updated books)

infra/smoke.sh

@@ -122,6 +122,62 @@ else
   exit 1
 fi
 
+# ─── full_rebuild par library ne casse pas les thumbnails des autres ──────────
+#
+# Régression : cleanup_orphaned_thumbnails chargeait uniquement les book IDs
+# de la library en cours de rebuild, supprimant les thumbnails des autres.
+#
+# Ce test nécessite au moins 2 libraries activées avec des livres indexés.
+
+echo "[smoke] test: full_rebuild per-library does not destroy other libraries thumbnails"
+LIBRARIES_JSON="$(auth "$BASE_API/libraries")"
+LIBRARY_COUNT="$(LIBRARIES_JSON="$LIBRARIES_JSON" python3 -c "import json,os; libs=json.loads(os.environ['LIBRARIES_JSON']); print(len(libs) if isinstance(libs,list) else 0)")"
+
+if [ "${LIBRARY_COUNT:-0}" -lt 2 ]; then
+  echo "[smoke] SKIP: need at least 2 libraries (found ${LIBRARY_COUNT:-0})"
+else
+  # Extraire les 2 premiers IDs de library
+  LIB_A="$(LIBRARIES_JSON="$LIBRARIES_JSON" python3 -c "import json,os; libs=json.loads(os.environ['LIBRARIES_JSON']); print(libs[0]['id'])")"
+  LIB_B="$(LIBRARIES_JSON="$LIBRARIES_JSON" python3 -c "import json,os; libs=json.loads(os.environ['LIBRARIES_JSON']); print(libs[1]['id'])")"
+  echo "[smoke] library A = $LIB_A, library B = $LIB_B"
+
+  # Compter les thumbnails de library B avant le rebuild de A
+  BOOKS_B_BEFORE="$(auth "$BASE_API/books?library_id=$LIB_B")"
+  THUMBS_BEFORE="$(BOOKS_B_BEFORE="$BOOKS_B_BEFORE" python3 -c "
+import json, os
+items = json.loads(os.environ['BOOKS_B_BEFORE']).get('items') or []
+print(sum(1 for b in items if b.get('thumbnail_url')))
+")"
+  echo "[smoke] library B: $THUMBS_BEFORE book(s) with thumbnail before rebuild of A"
+
+  if [ "${THUMBS_BEFORE:-0}" -eq 0 ]; then
+    echo "[smoke] SKIP: library B has no thumbnails to protect, test not meaningful"
+  else
+    # Lancer un full_rebuild sur library A uniquement
+    REBUILD_A_ID="$(auth -X POST -H "Content-Type: application/json" \
+      -d "{\"library_id\":\"$LIB_A\",\"full\":true}" \
+      "$BASE_API/index/rebuild" | python3 -c "import sys,json; print(json.load(sys.stdin)['id'])")"
+    echo "[smoke] full_rebuild library A job id: $REBUILD_A_ID"
+    wait_job "$REBUILD_A_ID" "full_rebuild library A"
+
+    # Vérifier que les thumbnails de library B sont intacts
+    BOOKS_B_AFTER="$(auth "$BASE_API/books?library_id=$LIB_B")"
+    THUMBS_AFTER="$(BOOKS_B_AFTER="$BOOKS_B_AFTER" python3 -c "
+import json, os
+items = json.loads(os.environ['BOOKS_B_AFTER']).get('items') or []
+print(sum(1 for b in items if b.get('thumbnail_url')))
+")"
+    echo "[smoke] library B: $THUMBS_AFTER book(s) with thumbnail after rebuild of A"
+
+    if [ "$THUMBS_AFTER" -lt "$THUMBS_BEFORE" ]; then
+      echo "[smoke] FAIL: full_rebuild of library A destroyed thumbnails of library B ($THUMBS_BEFORE → $THUMBS_AFTER)"
+      exit 1
+    else
+      echo "[smoke] OK: library B thumbnails preserved ($THUMBS_BEFORE → $THUMBS_AFTER)"
+    fi
+  fi
+fi
+
 # ─── metrics ─────────────────────────────────────────────────────────────────
 
 echo "[smoke] metrics"