add notelinks tabel for note to note references

drizzle/0004_violet_nicolaos.sql

@@ -0,0 +1,9 @@
+CREATE TABLE `note_links` (
+	`source_note_id` text NOT NULL,
+	`target_note_id` text NOT NULL,
+	FOREIGN KEY (`source_note_id`) REFERENCES `notes`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`target_note_id`) REFERENCES `notes`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `note_links_source_idx` ON `note_links` (`source_note_id`);--> statement-breakpoint
+CREATE INDEX `note_links_target_idx` ON `note_links` (`target_note_id`);

drizzle/meta/_journal.json

@@ -29,6 +29,13 @@
       "when": 1774037379518,
       "tag": "0003_uneven_tomorrow_man",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "6",
+      "when": 1785824271578,
+      "tag": "0004_violet_nicolaos",
+      "breakpoints": true
     }
   ]
 }

src/lib/server/db/index.ts

@@ -226,6 +226,13 @@ sqlite.exec(`
 		created_at INTEGER NOT NULL,
 		last_used_at INTEGER
 	);
+
+	CREATE TABLE IF NOT EXISTS note_links (
+		source_note_id TEXT NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
+		target_note_id TEXT NOT NULL REFERENCES notes(id) ON DELETE CASCADE
+	);
+	CREATE INDEX IF NOT EXISTS note_links_source_idx ON note_links(source_note_id);
+	CREATE INDEX IF NOT EXISTS note_links_target_idx ON note_links(target_note_id);
 `);
 
 // Replace old tags unique index with compound index including user_id

src/lib/server/db/note-links-schema.test.ts

@@ -0,0 +1,44 @@
+import { describe, it, expect } from 'vitest';
+import { eq } from 'drizzle-orm';
+import { createTestDb } from './test-helpers.js';
+import { notes, noteLinks, users } from './schema.js';
+
+describe('noteLinks schema', () => {
+	it('should store a source/target link row', () => {
+		const { db } = createTestDb();
+		db.insert(users)
+			.values({ email: 'a@test.com', displayName: 'A', role: 'user', authProvider: 'password', createdAt: new Date() })
+			.run();
+
+		db.insert(notes)
+			.values([
+				{ id: 'source-note', userId: 1, title: 'Source', content: '', createdAt: new Date(), updatedAt: new Date() },
+				{ id: 'target-note', userId: 1, title: 'Target', content: '', createdAt: new Date(), updatedAt: new Date() }
+			])
+			.run();
+
+		db.insert(noteLinks).values({ sourceNoteId: 'source-note', targetNoteId: 'target-note' }).run();
+
+		const rows = db.select().from(noteLinks).all();
+		expect(rows).toEqual([{ sourceNoteId: 'source-note', targetNoteId: 'target-note' }]);
+	});
+
+	it('should cascade-delete link rows when the source note is deleted', () => {
+		const { db, sqlite } = createTestDb();
+		sqlite.pragma('foreign_keys = ON');
+		db.insert(users)
+			.values({ email: 'a@test.com', displayName: 'A', role: 'user', authProvider: 'password', createdAt: new Date() })
+			.run();
+		db.insert(notes)
+			.values([
+				{ id: 'source-note', userId: 1, title: 'Source', content: '', createdAt: new Date(), updatedAt: new Date() },
+				{ id: 'target-note', userId: 1, title: 'Target', content: '', createdAt: new Date(), updatedAt: new Date() }
+			])
+			.run();
+		db.insert(noteLinks).values({ sourceNoteId: 'source-note', targetNoteId: 'target-note' }).run();
+
+		db.delete(notes).where(eq(notes.id, 'source-note')).run();
+
+		expect(db.select().from(noteLinks).all()).toEqual([]);
+	});
+});

src/lib/server/db/schema.ts

@@ -80,6 +80,22 @@ export const noteTags = sqliteTable(
 	]
 );
 
+export const noteLinks = sqliteTable(
+	'note_links',
+	{
+		sourceNoteId: text('source_note_id')
+			.references(() => notes.id, { onDelete: 'cascade' })
+			.notNull(),
+		targetNoteId: text('target_note_id')
+			.references(() => notes.id, { onDelete: 'cascade' })
+			.notNull()
+	},
+	(table) => [
+		index('note_links_source_idx').on(table.sourceNoteId),
+		index('note_links_target_idx').on(table.targetNoteId)
+	]
+);
+
 export const attachments = sqliteTable('attachments', {
 	id: text('id').primaryKey(),
 	userId: integer('user_id')

src/lib/server/db/test-helpers.ts

@@ -68,6 +68,13 @@ export function createTestDb(options?: { seedUser?: boolean }) {
 		CREATE INDEX note_tags_note_id_idx ON note_tags(note_id);
 		CREATE INDEX note_tags_tag_id_idx ON note_tags(tag_id);
 
+		CREATE TABLE note_links (
+			source_note_id TEXT NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
+			target_note_id TEXT NOT NULL REFERENCES notes(id) ON DELETE CASCADE
+		);
+		CREATE INDEX note_links_source_idx ON note_links(source_note_id);
+		CREATE INDEX note_links_target_idx ON note_links(target_note_id);
+
 		CREATE TABLE note_collaborators (
 			note_id TEXT NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
 			user_id INTEGER NOT NULL REFERENCES users(id),