feat: add cascade deletion for notebooks with delete preview (#471)

* feat: decrease chunking size for maximum ollama compatibility

* docs: improve i18n info on Claude.md

* feat: add cascade deletion for notebooks with delete preview

- Add Notebook.get_delete_preview() to show counts of affected items
- Add Notebook.delete(delete_exclusive_sources) for cascade deletion
- Always delete notes when notebook is deleted
- Allow user to choose: delete or keep exclusive sources
- Shared sources are always unlinked but never deleted
- Add NotebookDeleteDialog component with radio button options
- Add delete-preview API endpoint
- Update delete endpoint with delete_exclusive_sources param
- Add i18n support for all 5 locales

Closes #77

* docs: remove harcoded config settings

CLAUDE.md

@@ -57,6 +57,7 @@ User documentation is at @docs/
 - **Data Fetching**: TanStack Query (React Query)
 - **Styling**: Tailwind CSS + Shadcn/ui
 - **Build Tool**: Webpack (via Next.js)
+- **i18n compatible**: All front-end changes must also consider the translation keys
 
 ### API Backend (`api/` + `open_notebook/`)
 - **Framework**: FastAPI 0.104+

api/main.py

@@ -85,7 +85,6 @@ async def lifespan(app: FastAPI):
 app = FastAPI(
     title="Open Notebook API",
     description="API for Open Notebook - Research Assistant",
-    version="0.2.2",
     lifespan=lifespan,
 )
 

api/models.py

@@ -422,3 +422,25 @@ class SourceStatusResponse(BaseModel):
 class ErrorResponse(BaseModel):
     error: str
     message: str
+
+
+# Notebook delete cascade models
+class NotebookDeletePreview(BaseModel):
+    notebook_id: str = Field(..., description="ID of the notebook")
+    notebook_name: str = Field(..., description="Name of the notebook")
+    note_count: int = Field(..., description="Number of notes that will be deleted")
+    exclusive_source_count: int = Field(
+        ..., description="Number of sources only in this notebook"
+    )
+    shared_source_count: int = Field(
+        ..., description="Number of sources shared with other notebooks"
+    )
+
+
+class NotebookDeleteResponse(BaseModel):
+    message: str = Field(..., description="Success message")
+    deleted_notes: int = Field(..., description="Number of notes deleted")
+    deleted_sources: int = Field(..., description="Number of exclusive sources deleted")
+    unlinked_sources: int = Field(
+        ..., description="Number of sources unlinked from notebook"
+    )

api/routers/notebooks.py

@@ -3,7 +3,13 @@ from typing import List, Optional
 from fastapi import APIRouter, HTTPException, Query
 from loguru import logger
 
-from api.models import NotebookCreate, NotebookResponse, NotebookUpdate
+from api.models import (
+    NotebookCreate,
+    NotebookDeletePreview,
+    NotebookDeleteResponse,
+    NotebookResponse,
+    NotebookUpdate,
+)
 from open_notebook.database.repository import ensure_record_id, repo_query
 from open_notebook.domain.notebook import Notebook, Source
 from open_notebook.exceptions import InvalidInputError
@@ -82,6 +88,35 @@ async def create_notebook(notebook: NotebookCreate):
         )
 
 
+@router.get(
+    "/notebooks/{notebook_id}/delete-preview", response_model=NotebookDeletePreview
+)
+async def get_notebook_delete_preview(notebook_id: str):
+    """Get a preview of what will be deleted when this notebook is deleted."""
+    try:
+        notebook = await Notebook.get(notebook_id)
+        if not notebook:
+            raise HTTPException(status_code=404, detail="Notebook not found")
+
+        preview = await notebook.get_delete_preview()
+
+        return NotebookDeletePreview(
+            notebook_id=str(notebook.id),
+            notebook_name=notebook.name,
+            note_count=preview["note_count"],
+            exclusive_source_count=preview["exclusive_source_count"],
+            shared_source_count=preview["shared_source_count"],
+        )
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Error getting delete preview for notebook {notebook_id}: {e}")
+        raise HTTPException(
+            status_code=500,
+            detail=f"Error fetching notebook deletion preview: {str(e)}",
+        )
+
+
 @router.get("/notebooks/{notebook_id}", response_model=NotebookResponse)
 async def get_notebook(notebook_id: str):
     """Get a specific notebook by ID."""
@@ -255,17 +290,34 @@ async def remove_source_from_notebook(notebook_id: str, source_id: str):
         )
 
 
-@router.delete("/notebooks/{notebook_id}")
-async def delete_notebook(notebook_id: str):
-    """Delete a notebook."""
+@router.delete("/notebooks/{notebook_id}", response_model=NotebookDeleteResponse)
+async def delete_notebook(
+    notebook_id: str,
+    delete_exclusive_sources: bool = Query(
+        False,
+        description="Whether to delete sources that belong only to this notebook",
+    ),
+):
+    """
+    Delete a notebook with cascade deletion.
+
+    Always deletes all notes associated with the notebook.
+    If delete_exclusive_sources is True, also deletes sources that belong only
+    to this notebook (not linked to any other notebooks).
+    """
     try:
         notebook = await Notebook.get(notebook_id)
         if not notebook:
             raise HTTPException(status_code=404, detail="Notebook not found")
 
-        await notebook.delete()
+        result = await notebook.delete(delete_exclusive_sources=delete_exclusive_sources)
 
-        return {"message": "Notebook deleted successfully"}
+        return NotebookDeleteResponse(
+            message="Notebook deleted successfully",
+            deleted_notes=result["deleted_notes"],
+            deleted_sources=result["deleted_sources"],
+            unlinked_sources=result["unlinked_sources"],
+        )
     except HTTPException:
         raise
     except Exception as e:

frontend/src/app/(dashboard)/notebooks/components/NotebookCard.tsx

@@ -13,8 +13,8 @@ import {
   DropdownMenuItem,
   DropdownMenuTrigger,
 } from '@/components/ui/dropdown-menu'
-import { useUpdateNotebook, useDeleteNotebook } from '@/lib/hooks/use-notebooks'
-import { ConfirmDialog } from '@/components/common/ConfirmDialog'
+import { useUpdateNotebook } from '@/lib/hooks/use-notebooks'
+import { NotebookDeleteDialog } from './NotebookDeleteDialog'
 import { useState } from 'react'
 import { useTranslation } from '@/lib/hooks/use-translation'
 import { getDateLocale } from '@/lib/utils/date-locale'
@@ -27,7 +27,6 @@ export function NotebookCard({ notebook }: NotebookCardProps) {
   const [showDeleteDialog, setShowDeleteDialog] = useState(false)
   const router = useRouter()
   const updateNotebook = useUpdateNotebook()
-  const deleteNotebook = useDeleteNotebook()
 
   const handleArchiveToggle = (e: React.MouseEvent) => {
     e.stopPropagation()
@@ -37,11 +36,6 @@ export function NotebookCard({ notebook }: NotebookCardProps) {
     })
   }
 
-  const handleDelete = () => {
-    deleteNotebook.mutate(notebook.id)
-    setShowDeleteDialog(false)
-  }
-
   const handleCardClick = () => {
     router.push(`/notebooks/${encodeURIComponent(notebook.id)}`)
   }
@@ -132,14 +126,11 @@ export function NotebookCard({ notebook }: NotebookCardProps) {
           </CardContent>
       </Card>
 
-      <ConfirmDialog
+      <NotebookDeleteDialog
         open={showDeleteDialog}
         onOpenChange={setShowDeleteDialog}
-        title={t.notebooks.deleteNotebook}
-        description={t.notebooks.deleteNotebookDesc.replace('{name}', notebook.name)}
-        confirmText={t.common.delete}
-        confirmVariant="destructive"
-        onConfirm={handleDelete}
+        notebookId={notebook.id}
+        notebookName={notebook.name}
       />
     </>
   )

frontend/src/app/(dashboard)/notebooks/components/NotebookDeleteDialog.tsx

@@ -0,0 +1,176 @@
+'use client'
+
+import { useState, useEffect } from 'react'
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from '@/components/ui/alert-dialog'
+import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group'
+import { Label } from '@/components/ui/label'
+import { useTranslation } from '@/lib/hooks/use-translation'
+import { LoadingSpinner } from '@/components/common/LoadingSpinner'
+import { useNotebookDeletePreview, useDeleteNotebook } from '@/lib/hooks/use-notebooks'
+import { useRouter } from 'next/navigation'
+
+interface NotebookDeleteDialogProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  notebookId: string
+  notebookName: string
+  redirectAfterDelete?: boolean
+}
+
+export function NotebookDeleteDialog({
+  open,
+  onOpenChange,
+  notebookId,
+  notebookName,
+  redirectAfterDelete = false,
+}: NotebookDeleteDialogProps) {
+  const { t } = useTranslation()
+  const router = useRouter()
+  const [sourceAction, setSourceAction] = useState<'keep' | 'delete'>('keep')
+
+  // Reset state when dialog opens
+  useEffect(() => {
+    if (open) {
+      setSourceAction('keep')
+    }
+  }, [open, notebookId])
+
+  // Fetch delete preview when dialog is open
+  const { data: preview, isLoading: isLoadingPreview, error: previewError } = useNotebookDeletePreview(
+    notebookId,
+    open
+  )
+
+  const deleteNotebook = useDeleteNotebook()
+
+  const handleConfirm = async () => {
+    await deleteNotebook.mutateAsync({
+      id: notebookId,
+      deleteExclusiveSources: sourceAction === 'delete',
+    })
+    onOpenChange(false)
+    if (redirectAfterDelete) {
+      router.push('/notebooks')
+    }
+  }
+
+  const isDeleting = deleteNotebook.isPending
+
+  return (
+    <AlertDialog open={open} onOpenChange={onOpenChange}>
+      <AlertDialogContent>
+        <AlertDialogHeader>
+          <AlertDialogTitle>{t.notebooks.deleteNotebook}</AlertDialogTitle>
+          <AlertDialogDescription>
+            {t.notebooks.deleteNotebookDesc.replace('{name}', notebookName)}
+          </AlertDialogDescription>
+        </AlertDialogHeader>
+
+        <div className="py-4 space-y-3">
+          {isLoadingPreview ? (
+            <div className="flex items-center gap-2 text-muted-foreground">
+              <LoadingSpinner size="sm" />
+              <span>{t.notebooks.deleteNotebookLoading}</span>
+            </div>
+          ) : previewError ? (
+            <div className="text-sm text-destructive">
+              {t.common.error}: {previewError.message || 'Failed to load preview'}
+            </div>
+          ) : preview ? (
+            <>
+              {/* Notes section */}
+              <div className="text-sm">
+                {preview.note_count > 0 ? (
+                  <p className="text-destructive font-medium">
+                    {t.notebooks.deleteNotebookNotes.replace(
+                      '{count}',
+                      String(preview.note_count)
+                    )}
+                  </p>
+                ) : (
+                  <p className="text-muted-foreground">{t.notebooks.deleteNotebookNoNotes}</p>
+                )}
+              </div>
+
+              {/* Shared sources - always above the line */}
+              {preview.shared_source_count > 0 && (
+                <div className="text-sm">
+                  <p className="text-muted-foreground">
+                    {t.notebooks.deleteNotebookSharedSources.replace(
+                      '{count}',
+                      String(preview.shared_source_count)
+                    )}
+                  </p>
+                </div>
+              )}
+
+              {/* No sources message */}
+              {preview.exclusive_source_count === 0 && preview.shared_source_count === 0 && (
+                <div className="text-sm">
+                  <p className="text-muted-foreground">{t.notebooks.deleteNotebookNoSources}</p>
+                </div>
+              )}
+
+              {/* Exclusive sources section - below the line with radio buttons */}
+              {preview.exclusive_source_count > 0 && (
+                <div className="pt-3 border-t space-y-3">
+                  <p className="text-sm text-destructive font-medium">
+                    {t.notebooks.deleteNotebookExclusiveSources.replace(
+                      '{count}',
+                      String(preview.exclusive_source_count)
+                    )}
+                  </p>
+                  <RadioGroup
+                    value={sourceAction}
+                    onValueChange={(value) => setSourceAction(value as 'keep' | 'delete')}
+                    disabled={isDeleting}
+                  >
+                    <div className="flex items-center space-x-3">
+                      <RadioGroupItem value="delete" id="delete-sources" />
+                      <Label htmlFor="delete-sources" className="text-sm cursor-pointer">
+                        {t.notebooks.deleteExclusiveSourcesLabel}
+                      </Label>
+                    </div>
+                    <div className="flex items-center space-x-3">
+                      <RadioGroupItem value="keep" id="keep-sources" />
+                      <Label htmlFor="keep-sources" className="text-sm cursor-pointer">
+                        {t.notebooks.keepExclusiveSourcesLabel}
+                      </Label>
+                    </div>
+                  </RadioGroup>
+                </div>
+              )}
+            </>
+          ) : null}
+        </div>
+
+        <AlertDialogFooter>
+          <AlertDialogCancel disabled={isDeleting}>{t.common.cancel}</AlertDialogCancel>
+          <AlertDialogAction
+            onClick={handleConfirm}
+            disabled={isDeleting || isLoadingPreview}
+            className="bg-red-600 hover:bg-red-700"
+          >
+            {isDeleting ? (
+              <>
+                <LoadingSpinner size="sm" className="mr-2" />
+                {t.common.deleting}
+              </>
+            ) : (
+              t.common.delete
+            )}
+          </AlertDialogAction>
+        </AlertDialogFooter>
+      </AlertDialogContent>
+    </AlertDialog>
+  )
+}

frontend/src/app/(dashboard)/notebooks/components/NotebookHeader.tsx

@@ -5,8 +5,8 @@ import { NotebookResponse } from '@/lib/types/api'
 import { Button } from '@/components/ui/button'
 import { Badge } from '@/components/ui/badge'
 import { Archive, ArchiveRestore, Trash2 } from 'lucide-react'
-import { useUpdateNotebook, useDeleteNotebook } from '@/lib/hooks/use-notebooks'
-import { ConfirmDialog } from '@/components/common/ConfirmDialog'
+import { useUpdateNotebook } from '@/lib/hooks/use-notebooks'
+import { NotebookDeleteDialog } from './NotebookDeleteDialog'
 import { formatDistanceToNow } from 'date-fns'
 import { getDateLocale } from '@/lib/utils/date-locale'
 import { InlineEdit } from '@/components/common/InlineEdit'
@@ -22,7 +22,6 @@ export function NotebookHeader({ notebook }: NotebookHeaderProps) {
   const [showDeleteDialog, setShowDeleteDialog] = useState(false)
   
   const updateNotebook = useUpdateNotebook()
-  const deleteNotebook = useDeleteNotebook()
 
   const handleUpdateName = async (name: string) => {
     if (!name || name === notebook.name) return
@@ -49,11 +48,6 @@ export function NotebookHeader({ notebook }: NotebookHeaderProps) {
     })
   }
 
-  const handleDelete = () => {
-    deleteNotebook.mutate(notebook.id)
-    setShowDeleteDialog(false)
-  }
-
   return (
     <>
       <div className="border-b pb-6">
@@ -122,14 +116,12 @@ export function NotebookHeader({ notebook }: NotebookHeaderProps) {
         </div>
       </div>
 
-      <ConfirmDialog
+      <NotebookDeleteDialog
         open={showDeleteDialog}
         onOpenChange={setShowDeleteDialog}
-        title={t.notebooks.deleteNotebook}
-        description={t.notebooks.deleteNotebookDesc.replace('{name}', notebook.name)}
-        confirmText={t.common.deleteForever}
-        confirmVariant="destructive"
-        onConfirm={handleDelete}
+        notebookId={notebook.id}
+        notebookName={notebook.name}
+        redirectAfterDelete
       />
     </>
   )

frontend/src/lib/api/notebooks.ts

@@ -1,5 +1,11 @@
 import apiClient from './client'
-import { NotebookResponse, CreateNotebookRequest, UpdateNotebookRequest } from '@/lib/types/api'
+import {
+  NotebookResponse,
+  CreateNotebookRequest,
+  UpdateNotebookRequest,
+  NotebookDeletePreview,
+  NotebookDeleteResponse,
+} from '@/lib/types/api'
 
 export const notebooksApi = {
   list: async (params?: { archived?: boolean; order_by?: string }) => {
@@ -22,8 +28,18 @@ export const notebooksApi = {
     return response.data
   },
 
-  delete: async (id: string) => {
-    await apiClient.delete(`/notebooks/${id}`)
+  deletePreview: async (id: string) => {
+    const response = await apiClient.get<NotebookDeletePreview>(
+      `/notebooks/${id}/delete-preview`
+    )
+    return response.data
+  },
+
+  delete: async (id: string, deleteExclusiveSources: boolean = false) => {
+    const response = await apiClient.delete<NotebookDeleteResponse>(`/notebooks/${id}`, {
+      params: { delete_exclusive_sources: deleteExclusiveSources },
+    })
+    return response.data
   },
 
   addSource: async (notebookId: string, sourceId: string) => {
@@ -34,5 +50,5 @@ export const notebooksApi = {
   removeSource: async (notebookId: string, sourceId: string) => {
     const response = await apiClient.delete(`/notebooks/${notebookId}/sources/${sourceId}`)
     return response.data
-  }
+  },
 }

frontend/src/lib/hooks/use-notebooks.ts

@@ -71,15 +71,31 @@ export function useUpdateNotebook() {
   })
 }
 
+export function useNotebookDeletePreview(id: string, enabled: boolean = false) {
+  return useQuery({
+    queryKey: [...QUERY_KEYS.notebook(id), 'delete-preview'],
+    queryFn: () => notebooksApi.deletePreview(id),
+    enabled: !!id && enabled,
+  })
+}
+
 export function useDeleteNotebook() {
   const queryClient = useQueryClient()
   const { toast } = useToast()
   const { t } = useTranslation()
 
   return useMutation({
-    mutationFn: (id: string) => notebooksApi.delete(id),
+    mutationFn: ({
+      id,
+      deleteExclusiveSources = false,
+    }: {
+      id: string
+      deleteExclusiveSources?: boolean
+    }) => notebooksApi.delete(id, deleteExclusiveSources),
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: QUERY_KEYS.notebooks })
+      // Also invalidate sources since some may have been deleted
+      queryClient.invalidateQueries({ queryKey: ['sources'] })
       toast({
         title: t.common.success,
         description: t.notebooks.deleteSuccess,

frontend/src/lib/locales/en-US/index.ts

@@ -236,7 +236,15 @@ export const enUS = {
     archive: "Archive",
     unarchive: "Unarchive",
     deleteNotebook: "Delete Notebook",
-    deleteNotebookDesc: "Are you sure you want to delete this notebook? This action cannot be undone.",
+    deleteNotebookDesc: "Are you sure you want to delete \"{name}\"? This action cannot be undone.",
+    deleteNotebookLoading: "Loading deletion preview...",
+    deleteNotebookNotes: "{count} note(s) will be permanently deleted.",
+    deleteNotebookNoNotes: "No notes to delete.",
+    deleteNotebookExclusiveSources: "{count} source(s) exist only in this notebook.",
+    deleteNotebookSharedSources: "{count} source(s) are shared with other notebooks and will be unlinked.",
+    deleteNotebookNoSources: "No sources in this notebook.",
+    deleteExclusiveSourcesLabel: "Delete exclusive sources",
+    keepExclusiveSourcesLabel: "Unlink and keep them",
     activeNotebooks: "Active Notebooks",
     archivedNotebooks: "Archived Notebooks",
     emptyDescription: "Start by creating your first notebook to organize your research.",

frontend/src/lib/locales/ja-JP/index.ts

@@ -236,7 +236,15 @@ export const jaJP = {
     archive: "アーカイブ",
     unarchive: "アーカイブ解除",
     deleteNotebook: "ノートブックを削除",
-    deleteNotebookDesc: "このノートブックを削除しますか？この操作は元に戻せません。",
+    deleteNotebookDesc: "\"{name}\" を削除しますか？この操作は元に戻せません。",
+    deleteNotebookLoading: "削除プレビューを読み込み中...",
+    deleteNotebookNotes: "{count}件のノートが完全に削除されます。",
+    deleteNotebookNoNotes: "削除するノートはありません。",
+    deleteNotebookExclusiveSources: "{count}件のソースはこのノートブックにのみ存在します。",
+    deleteNotebookSharedSources: "{count}件のソースは他のノートブックと共有されており、リンクが解除されます。",
+    deleteNotebookNoSources: "このノートブックにソースはありません。",
+    deleteExclusiveSourcesLabel: "専用ソースを削除",
+    keepExclusiveSourcesLabel: "リンク解除して保持",
     activeNotebooks: "アクティブなノートブック",
     archivedNotebooks: "アーカイブ済みノートブック",
     emptyDescription: "最初のノートブックを作成してリサーチを整理しましょう。",

frontend/src/lib/locales/pt-BR/index.ts

@@ -236,7 +236,15 @@ export const ptBR = {
     archive: "Arquivar",
     unarchive: "Desarquivar",
     deleteNotebook: "Excluir Caderno",
-    deleteNotebookDesc: "Tem certeza que deseja excluir este caderno? Esta ação não pode ser desfeita.",
+    deleteNotebookDesc: "Tem certeza que deseja excluir \"{name}\"? Esta ação não pode ser desfeita.",
+    deleteNotebookLoading: "Carregando prévia da exclusão...",
+    deleteNotebookNotes: "{count} nota(s) serão permanentemente excluídas.",
+    deleteNotebookNoNotes: "Nenhuma nota para excluir.",
+    deleteNotebookExclusiveSources: "{count} fonte(s) existem apenas neste caderno.",
+    deleteNotebookSharedSources: "{count} fonte(s) são compartilhadas com outros cadernos e serão desvinculadas.",
+    deleteNotebookNoSources: "Nenhuma fonte neste caderno.",
+    deleteExclusiveSourcesLabel: "Excluir fontes exclusivas",
+    keepExclusiveSourcesLabel: "Desvincular e manter",
     activeNotebooks: "Cadernos Ativos",
     archivedNotebooks: "Cadernos Arquivados",
     emptyDescription: "Comece criando seu primeiro caderno para organizar sua pesquisa.",

frontend/src/lib/locales/zh-CN/index.ts

@@ -236,7 +236,15 @@ export const zhCN = {
     archive: "归档",
     unarchive: "取消归档",
     deleteNotebook: "删除笔记本",
-    deleteNotebookDesc: "您确定要删除此笔记本吗？此操作无法撤销。",
+    deleteNotebookDesc: "您确定要删除 \"{name}\" 吗？此操作无法撤销。",
+    deleteNotebookLoading: "正在加载删除预览...",
+    deleteNotebookNotes: "{count} 个笔记将被永久删除。",
+    deleteNotebookNoNotes: "没有要删除的笔记。",
+    deleteNotebookExclusiveSources: "{count} 个来源仅存在于此笔记本中。",
+    deleteNotebookSharedSources: "{count} 个来源与其他笔记本共享，将被取消关联。",
+    deleteNotebookNoSources: "此笔记本中没有来源。",
+    deleteExclusiveSourcesLabel: "删除专属来源",
+    keepExclusiveSourcesLabel: "取消关联并保留",
     activeNotebooks: "活动的笔记本",
     archivedNotebooks: "归档的笔记本",
     emptyDescription: "从创建您的第一个笔记本开始，组织您的研究。",

frontend/src/lib/locales/zh-TW/index.ts

@@ -236,7 +236,15 @@ export const zhTW = {
     archive: "封存",
     unarchive: "取消封存",
     deleteNotebook: "刪除筆記本",
-    deleteNotebookDesc: "您確定要刪除此筆記本嗎？此操作無法復原。",
+    deleteNotebookDesc: "您確定要刪除 \"{name}\" 嗎？此操作無法復原。",
+    deleteNotebookLoading: "正在載入刪除預覽...",
+    deleteNotebookNotes: "{count} 個筆記將被永久刪除。",
+    deleteNotebookNoNotes: "沒有要刪除的筆記。",
+    deleteNotebookExclusiveSources: "{count} 個來源僅存在於此筆記本中。",
+    deleteNotebookSharedSources: "{count} 個來源與其他筆記本共享，將被取消關聯。",
+    deleteNotebookNoSources: "此筆記本中沒有來源。",
+    deleteExclusiveSourcesLabel: "刪除專屬來源",
+    keepExclusiveSourcesLabel: "取消關聯並保留",
     activeNotebooks: "活動中的筆記本",
     archivedNotebooks: "封存的筆記本",
     emptyDescription: "從新增您的第一個筆記本開始，組織您的研究。",

frontend/src/lib/types/api.ts

@@ -71,6 +71,21 @@ export interface UpdateNotebookRequest {
   archived?: boolean
 }
 
+export interface NotebookDeletePreview {
+  notebook_id: string
+  notebook_name: string
+  note_count: number
+  exclusive_source_count: number
+  shared_source_count: number
+}
+
+export interface NotebookDeleteResponse {
+  message: string
+  deleted_notes: number
+  deleted_sources: number
+  unlinked_sources: number
+}
+
 export interface CreateNoteRequest {
   title?: string
   content: string

open_notebook/domain/CLAUDE.md

@@ -25,6 +25,8 @@ Two base classes support different persistence patterns: **ObjectModel** (mutabl
 ### notebook.py
 - **Notebook**: Research project container
   - `get_sources()`, `get_notes()`, `get_chat_sessions()`: Navigate relationships
+  - `get_delete_preview()`: Returns counts of notes, exclusive sources, and shared sources that would be affected by deletion
+  - `delete(delete_exclusive_sources)`: Cascade deletion - always deletes notes, optionally deletes exclusive sources, always unlinks all sources
 
 - **Source**: Content item (file/URL)
   - `vectorize()`: Submit async embedding job (returns command_id, fire-and-forget)

open_notebook/domain/notebook.py

@@ -85,6 +85,150 @@ class Notebook(ObjectModel):
             logger.exception(e)
             raise DatabaseOperationError(e)
 
+    async def get_delete_preview(self) -> Dict[str, Any]:
+        """
+        Get counts of items that would be affected by deleting this notebook.
+
+        Returns a dict with:
+        - note_count: Number of notes that will be deleted
+        - exclusive_source_count: Sources only in this notebook (can be deleted)
+        - shared_source_count: Sources in other notebooks (will be unlinked only)
+        """
+        try:
+            notebook_id = ensure_record_id(self.id)
+
+            # Count notes
+            note_result = await repo_query(
+                "SELECT count() as count FROM artifact WHERE out = $notebook_id GROUP ALL",
+                {"notebook_id": notebook_id},
+            )
+            note_count = note_result[0]["count"] if note_result else 0
+
+            # Get sources with count of references to OTHER notebooks
+            # If assigned_others = 0, source is exclusive to this notebook
+            # If assigned_others > 0, source is shared with other notebooks
+            source_counts = await repo_query(
+                """
+                SELECT
+                    id,
+                    count(->reference[WHERE out != $notebook_id].out) as assigned_others
+                FROM (SELECT VALUE <-reference.in AS sources FROM $notebook_id)[0]
+                """,
+                {"notebook_id": notebook_id},
+            )
+
+            exclusive_count = 0
+            shared_count = 0
+            for src in source_counts:
+                if src.get("assigned_others", 0) == 0:
+                    exclusive_count += 1
+                else:
+                    shared_count += 1
+
+            return {
+                "note_count": note_count,
+                "exclusive_source_count": exclusive_count,
+                "shared_source_count": shared_count,
+            }
+        except Exception as e:
+            logger.error(f"Error getting delete preview for notebook {self.id}: {e}")
+            logger.exception(e)
+            raise DatabaseOperationError(e)
+
+    async def delete(self, delete_exclusive_sources: bool = False) -> Dict[str, int]:
+        """
+        Delete notebook with cascade deletion of notes and optional source deletion.
+
+        Args:
+            delete_exclusive_sources: If True, also delete sources that belong
+                                     only to this notebook. Default is False.
+
+        Returns:
+            Dict with counts: deleted_notes, deleted_sources, unlinked_sources
+        """
+        if self.id is None:
+            raise InvalidInputError("Cannot delete notebook without an ID")
+
+        try:
+            notebook_id = ensure_record_id(self.id)
+            deleted_notes = 0
+            deleted_sources = 0
+            unlinked_sources = 0
+
+            # 1. Get and delete all notes linked to this notebook
+            notes = await self.get_notes()
+            for note in notes:
+                await note.delete()
+                deleted_notes += 1
+            logger.info(f"Deleted {deleted_notes} notes for notebook {self.id}")
+
+            # Delete artifact relationships
+            await repo_query(
+                "DELETE artifact WHERE out = $notebook_id",
+                {"notebook_id": notebook_id},
+            )
+
+            # 2. Handle sources
+            if delete_exclusive_sources:
+                # Find sources with count of references to OTHER notebooks
+                # If assigned_others = 0, source is exclusive to this notebook
+                source_counts = await repo_query(
+                    """
+                    SELECT
+                        id,
+                        count(->reference[WHERE out != $notebook_id].out) as assigned_others
+                    FROM (SELECT VALUE <-reference.in AS sources FROM $notebook_id)[0]
+                    """,
+                    {"notebook_id": notebook_id},
+                )
+
+                for src in source_counts:
+                    source_id = src.get("id")
+                    if source_id and src.get("assigned_others", 0) == 0:
+                        # Exclusive source - delete it
+                        try:
+                            source = await Source.get(str(source_id))
+                            await source.delete()
+                            deleted_sources += 1
+                        except Exception as e:
+                            logger.warning(
+                                f"Failed to delete exclusive source {source_id}: {e}"
+                            )
+                    else:
+                        unlinked_sources += 1
+            else:
+                # Just count sources that will be unlinked
+                source_result = await repo_query(
+                    "SELECT count() as count FROM reference WHERE out = $notebook_id GROUP ALL",
+                    {"notebook_id": notebook_id},
+                )
+                unlinked_sources = source_result[0]["count"] if source_result else 0
+
+            # Delete reference relationships (unlink all sources)
+            await repo_query(
+                "DELETE reference WHERE out = $notebook_id",
+                {"notebook_id": notebook_id},
+            )
+            logger.info(
+                f"Unlinked {unlinked_sources} sources, deleted {deleted_sources} "
+                f"exclusive sources for notebook {self.id}"
+            )
+
+            # 3. Delete the notebook record itself
+            await super().delete()
+            logger.info(f"Deleted notebook {self.id}")
+
+            return {
+                "deleted_notes": deleted_notes,
+                "deleted_sources": deleted_sources,
+                "unlinked_sources": unlinked_sources,
+            }
+
+        except Exception as e:
+            logger.error(f"Error deleting notebook {self.id}: {e}")
+            logger.exception(e)
+            raise DatabaseOperationError(f"Failed to delete notebook: {e}")
+
 
 class Asset(BaseModel):
     file_path: Optional[str] = None

open_notebook/utils/CLAUDE.md

@@ -39,8 +39,8 @@ Each utility is stateless and can be imported independently.
 
 ### chunking.py
 - **ContentType**: Enum (HTML, MARKDOWN, PLAIN)
-- **CHUNK_SIZE**: 1500 characters (constant)
-- **CHUNK_OVERLAP**: 225 characters (15% overlap)
+- **CHUNK_SIZE**: constant
+- **CHUNK_OVERLAP**: constant
 - **detect_content_type_from_extension(file_path)**: Detect type from file extension
 - **detect_content_type_from_heuristics(text)**: Detect type from content patterns (returns type + confidence)
 - **detect_content_type(text, file_path)**: Combined detection (extension primary, heuristics fallback)

open_notebook/utils/chunking.py

@@ -22,8 +22,8 @@ from langchain_text_splitters import (
 from loguru import logger
 
 # Constants
-CHUNK_SIZE = 1500  # characters
-CHUNK_OVERLAP = 225  # 15% of chunk size
+CHUNK_SIZE = 1200  # characters
+CHUNK_OVERLAP = 180  # 15% of chunk size
 HIGH_CONFIDENCE_THRESHOLD = 0.8  # Threshold for heuristics to override extension
 
 
@@ -73,7 +73,9 @@ _EXTENSION_TO_CONTENT_TYPE = {
 }
 
 
-def detect_content_type_from_extension(file_path: Optional[str]) -> Optional[ContentType]:
+def detect_content_type_from_extension(
+    file_path: Optional[str],
+) -> Optional[ContentType]:
     """
     Detect content type from file extension.
 
@@ -220,9 +222,7 @@ def _calculate_markdown_score(text: str) -> float:
     return min(score, 1.0)
 
 
-def detect_content_type(
-    text: str, file_path: Optional[str] = None
-) -> ContentType:
+def detect_content_type(text: str, file_path: Optional[str] = None) -> ContentType:
     """
     Detect content type using file extension (primary) and heuristics (fallback).
 
@@ -352,12 +352,18 @@ def chunk_text(
         splitter = _get_html_splitter()
         # HTML splitter returns Document objects
         docs = splitter.split_text(text)
-        chunks = [doc.page_content if hasattr(doc, "page_content") else str(doc) for doc in docs]
+        chunks = [
+            doc.page_content if hasattr(doc, "page_content") else str(doc)
+            for doc in docs
+        ]
     elif content_type == ContentType.MARKDOWN:
         splitter = _get_markdown_splitter()
         # Markdown splitter returns Document objects
         docs = splitter.split_text(text)
-        chunks = [doc.page_content if hasattr(doc, "page_content") else str(doc) for doc in docs]
+        chunks = [
+            doc.page_content if hasattr(doc, "page_content") else str(doc)
+            for doc in docs
+        ]
     else:
         # Plain text - use recursive splitter directly
         splitter = _get_plain_splitter()