fix(notes): #garageristeriet og #GarageRisteriet er samme projekt

De var det ikke. Nøglen blev gemt præcis som skrevet og slået op på samme måde,
så en note, der nævnte et projekt med lille begyndelsesbogstav, dukkede simpelthen
ikke op på det — stille, og uden noget der antydede hvorfor.

Foldet på vej ind og foldet i opslaget, så sammenligningen bliver ved med at være
en nøjagtig lighed og bruger sit indeks. Havde man i stedet sænket kolonnen i
forespørgslen, skulle hele tabellen læses.

Kun projekter. En [[notetitel]] er en titel, ikke en nøgle: to noter, der hedder
"Møde" og "møde", er to noter, og at folde dem sammen ville slå noget sammen,
nogen havde holdt adskilt. Der er en prøve for begge dele.

Migrationen samler de rækker, der allerede er skrevet. Primærnøglen er
(note_id, kind, target_id), så en note, der skrev begge stavemåder, ville kollidere
med sig selv — derfor bygges sættet forfra med INSERT OR IGNORE frem for en
opdatering, der ville fejle på parret.

Fladen viser projektets egen stavemåde og ikke den foldede nøgle. En etiket, ingen
har skrevet, og som står hverken i noten eller på projektet, ville være værre end
ingen.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

internal/store/migrations/0020_fold_note_tags.sql

@@ -0,0 +1,29 @@
+-- #garageristeriet and #GarageRisteriet are the same project.
+--
+-- They were not, because the key was stored exactly as typed and looked up the
+-- same way — so a note that named a project in lower case simply did not appear
+-- on it, silently and with nothing to suggest why.
+--
+-- Folded on the way in from now on; this brings the rows already written into
+-- line. Only projects: a [[note title]] is a title, and two notes called "Møde"
+-- and "møde" are two notes.
+--
+-- The primary key is (note_id, kind, target_id), so folding can collide with a row
+-- that is already there — a note that wrote both spellings. INSERT OR IGNORE into
+-- a fresh set and swap, which keeps one of each rather than failing on the pair.
+CREATE TABLE note_links_folded (
+    note_id     TEXT NOT NULL REFERENCES notes (id) ON DELETE CASCADE,
+    kind        TEXT NOT NULL CHECK (kind IN ('task', 'note', 'project')),
+    target_id   TEXT NOT NULL,
+    PRIMARY KEY (note_id, kind, target_id)
+);
+
+INSERT OR IGNORE INTO note_links_folded (note_id, kind, target_id)
+SELECT note_id, kind,
+       CASE WHEN kind = 'project' THEN lower(target_id) ELSE target_id END
+FROM note_links;
+
+DROP TABLE note_links;
+ALTER TABLE note_links_folded RENAME TO note_links;
+
+CREATE INDEX note_links_backwards ON note_links (kind, target_id);

internal/store/notes.go

@@ -128,7 +128,14 @@ func LinksIn(body string) []NoteLink {
 		add("task", strings.ToLower(m[1]))
 	}
 	for _, m := range projectRef.FindAllStringSubmatch(body, -1) {
-		add("project", m[1])
+		// Folded, because #garageristeriet and #GarageRisteriet are the same project
+		// to everybody except a database. The key is stored folded and looked up
+		// folded, so the comparison stays an exact match and keeps using its index —
+		// a comparison that lowered the column instead would read the whole table.
+		//
+		// The project's real spelling is not lost: it is on the project, which is
+		// what the interface shows. This column is a key, not a label.
+		add("project", strings.ToLower(m[1]))
 	}
 	for _, m := range noteRef.FindAllStringSubmatch(body, -1) {
 		add("note", strings.TrimSpace(m[1]))
@@ -210,6 +217,9 @@ func (db *DB) AllNotes(ctx context.Context, userID string) ([]Note, error) {
 // The reason note_links exists. Without it this would mean reading every note's
 // prose, and a panel that slow is one nobody leaves open.
 func (db *DB) NotesLinking(ctx context.Context, kind, targetID string) ([]Note, error) {
+	if kind == "project" {
+		targetID = strings.ToLower(targetID)
+	}
 	return db.notesWhere(ctx, `
 		WHERE deleted_at IS NULL
 		  AND id IN (SELECT note_id FROM note_links WHERE kind = ? AND target_id = ?)

internal/store/notes_test.go

@@ -29,7 +29,10 @@ func TestATagInANoteIsTheSameTagAsInATask(t *testing.T) {
 	if len(projects) != 2 {
 		t.Fatalf("read %v out of the note, want the two projects", n.Links)
 	}
-	if projects[0] != "Firma" || projects[1] != "Regnskab" {
+	// Folded: the key is a key, not a label. #firma and #Firma are the same project
+	// to everybody except a database, and the project's own spelling is on the
+	// project, which is what the interface shows.
+	if projects[0] != "firma" || projects[1] != "regnskab" {
 		t.Errorf("got %v", projects)
 	}
 }
@@ -173,7 +176,9 @@ func TestWhatIsReadOutOfABody(t *testing.T) {
 		{"a hash inside a word is not a tag", "C#Sharp og x#y", nil},
 		{"a note by title", "se [[Møde med Anders]]", []NoteLink{{"note", "Møde med Anders"}}},
 		{"the same tag twice is one link", "#Firma og #Firma igen",
-			[]NoteLink{{"project", "Firma"}}},
+			[]NoteLink{{"project", "firma"}}},
+		{"two spellings are one tag", "#Firma og #firma",
+			[]NoteLink{{"project", "firma"}}},
 		{"a heading is not a tag", "# Overskrift", nil},
 	} {
 		t.Run(c.name, func(t *testing.T) {
@@ -289,3 +294,42 @@ func TestTheTitleFollowsTheFirstLine(t *testing.T) {
 		t.Errorf("a title set by hand survived as %q", n.Title)
 	}
 }
+
+// A note that names a project in the other case must still turn up on it.
+//
+// It did not, and nothing said why: the key was stored exactly as typed and
+// looked up the same way, so #garageristeriet and #GarageRisteriet were two
+// different things that looked identical to a person.
+func TestATagFindsItsProjectWhateverTheCase(t *testing.T) {
+	db, userID := sealedStore(t)
+	ctx := context.Background()
+
+	if err := db.SaveNote(ctx, &Note{
+		CreatedBy: userID,
+		Body:      "Bønnerne kommer fredag #garageristeriet",
+	}); err != nil {
+		t.Fatal(err)
+	}
+
+	for _, spelling := range []string{"GarageRisteriet", "garageristeriet", "GARAGERISTERIET"} {
+		found, err := db.NotesLinking(ctx, "project", spelling)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(found) != 1 {
+			t.Errorf("looking up %q found %d notes, want 1", spelling, len(found))
+		}
+	}
+
+	// A note title is a title, not a key: two notes called "Møde" and "møde" are
+	// two notes, and folding them together would merge things somebody kept apart.
+	if err := db.SaveNote(ctx, &Note{CreatedBy: userID, Body: "se [[Møde]]"}); err != nil {
+		t.Fatal(err)
+	}
+	if found, _ := db.NotesLinking(ctx, "note", "møde"); len(found) != 0 {
+		t.Error("a note title was folded")
+	}
+	if found, _ := db.NotesLinking(ctx, "note", "Møde"); len(found) != 1 {
+		t.Error("a note title did not match itself")
+	}
+}

web/e2e/smoke.spec.js

@@ -2177,3 +2177,37 @@ test('# foreslår et projekt, og titlen følger den første linje', async ({ pag
 
 	expect(trouble).toEqual([]);
 });
+
+test('et tag finder sit projekt uanset store og små bogstaver', async ({ page }) => {
+	const trouble = watchForTrouble(page);
+	await page.goto('/');
+
+	const sidebar = page.getByRole('navigation', { name: 'Hovedmenu' });
+	await sidebar.getByRole('button', { name: 'Nyt projekt' }).click();
+	await sidebar.getByLabel('Projektnavn').fill('StoreBogstaver');
+	await sidebar.getByLabel('Projektnavn').press('Enter');
+	await expect(sidebar.getByRole('link', { name: 'StoreBogstaver' })).toBeVisible();
+
+	await sidebar.getByRole('link', { name: 'Noter', exact: true }).click();
+	await page.getByRole('button', { name: 'Ny note' }).click();
+	const ed = page.getByRole('textbox', { name: 'Notens tekst' });
+	await ed.click();
+
+	// Written in lower case, the way somebody types when they are not thinking
+	// about it. It used to mean the note simply never appeared on the project, with
+	// nothing anywhere to say why.
+	await page.keyboard.type('Aftale om levering');
+	await page.keyboard.press('Enter');
+	await page.keyboard.type('Handler om #storebogstaver');
+	await page.keyboard.press('Escape');
+	await ed.blur();
+
+	// The panel shows the project's own spelling, not the folded key: a label
+	// nobody wrote and that is nowhere in the note would be worse than none.
+	await expect(page.locator('.link', { hasText: '#StoreBogstaver' })).toBeVisible();
+
+	await sidebar.getByRole('link', { name: 'StoreBogstaver' }).click();
+	await expect(page.locator('.notes').getByRole('link', { name: /Aftale om levering/ })).toBeVisible();
+
+	expect(trouble).toEqual([]);
+});

web/src/routes/noter/+page.svelte

@@ -160,6 +160,22 @@
 		}
 	}
 
+	/**
+	 * What a link is called on screen.
+	 *
+	 * A project tag is stored folded, because it is a key — but showing the folded
+	 * key would mean a note that says #garageristeriet is labelled with a spelling
+	 * that appears nowhere, neither in the note nor on the project. The project's
+	 * own name is the right answer, and the fold is what makes it findable.
+	 */
+	function label(link) {
+		if (link.kind !== 'project') return link.target_id;
+		const project = app.projects.find(
+			(p) => p.name.toLowerCase() === link.target_id.toLowerCase()
+		);
+		return '#' + (project?.name ?? link.target_id);
+	}
+
 	// What the note points at, for the panel under the editor.
 	let links = $derived(selected?.links ?? []);
 
@@ -229,7 +245,7 @@
 				{#if links.length}
 					<span class="links">
 						{#each links as link}
-							<span class="link">{link.kind === 'project' ? '#' : ''}{link.target_id}</span>
+							<span class="link">{label(link)}</span>
 						{/each}
 					</span>
 				{/if}