feat: add shared_notes schema and NoteShare types

Add sharedNotes table with noteId primary key, unique token, and
cascade delete. Add NoteShare and SharedNoteData interfaces.
Extend Note type with optional shareToken field.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/server/auth.ts

@@ -236,6 +236,11 @@ export async function deleteUser(userId: number): Promise<void> {
 		.run(userId, userId);
 	sqlite.prepare('DELETE FROM sync_log WHERE user_id = ?').run(userId);
 	sqlite.prepare('DELETE FROM attachments WHERE user_id = ?').run(userId);
+	sqlite
+		.prepare(
+			'DELETE FROM shared_notes WHERE note_id IN (SELECT id FROM notes WHERE user_id = ?)'
+		)
+		.run(userId);
 	sqlite
 		.prepare(
 			'DELETE FROM note_tags WHERE note_id IN (SELECT id FROM notes WHERE user_id = ?)'

src/lib/server/db/schema.ts

@@ -190,6 +190,15 @@ export const userPreferences = sqliteTable(
 	(table) => [uniqueIndex('user_preferences_user_key_unique').on(table.userId, table.key)]
 );
 
+export const sharedNotes = sqliteTable('shared_notes', {
+	noteId: text('note_id')
+		.primaryKey()
+		.references(() => notes.id, { onDelete: 'cascade' }),
+	token: text('token').notNull().unique(),
+	createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
+	expiresAt: integer('expires_at', { mode: 'timestamp' })
+});
+
 export const noteVersions = sqliteTable(
 	'note_versions',
 	{

src/lib/types/index.ts

@@ -17,6 +17,7 @@ export interface Note {
 	collaborators?: Collaborator[];
 	isOwner?: boolean;
 	isShared?: boolean;
+	shareToken?: string;
 }
 
 export interface Collaborator {
@@ -118,5 +119,22 @@ export interface NoteVersion {
 	createdAt: Date;
 }
 
+export interface NoteShare {
+	noteId: string;
+	token: string;
+	createdAt: Date;
+	expiresAt: Date | null;
+}
+
+export interface SharedNoteData {
+	title: string;
+	content: string;
+	checklistMode: boolean;
+	color: NoteColor;
+	attachments: Attachment[];
+	createdAt: Date;
+	updatedAt: Date;
+}
+
 export type { UserPreferences } from './preferences.js';
 export { DEFAULT_PREFERENCES, BOOLEAN_PREF_KEYS } from './preferences.js';