feat: replace 'Is a' / 'is_a' with 'type' as the canonical frontmatter key

- Rust Frontmatter struct now parses both 'type' (new) and 'Is A'/'is_a' (legacy),
  with 'type' taking precedence via resolve_type()
- Added migrate_is_a_to_type() vault-wide migration (runs on startup, also exposed as Tauri command)
- Frontend: buildNoteContent and resolveNewType now emit 'type:' in YAML
- Inspector SKIP_KEYS hides 'is_a', 'Is A', 'type', 'title' from property list
  (TypeRow already renders the type with its dedicated UI)
- frontmatterToEntryPatch handles both 'type' and legacy 'is_a' keys
- Mock data updated: all YAML content uses 'type:' instead of 'is_a:'/'Is A:'
- Tests updated to expect 'type:' in generated frontmatter

Product decision: internal VaultEntry field stays as `isA` (TS) / `is_a` (Rust)
to minimize blast radius. The user-facing change is the YAML key and inspector.

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

src-tauri/src/lib.rs

@@ -100,6 +100,11 @@ fn purge_trash(vault_path: String) -> Result<Vec<String>, String> {
     vault::purge_trash(&vault_path)
 }
 
+#[tauri::command]
+fn migrate_is_a_to_type(vault_path: String) -> Result<usize, String> {
+    vault::migrate_is_a_to_type(&vault_path)
+}
+
 #[tauri::command]
 fn get_settings() -> Result<Settings, String> {
     settings::get_settings()
@@ -154,7 +159,8 @@ pub fn run() {
                 .map(|h| h.join("Laputa"))
                 .unwrap_or_default();
             if vault_path.is_dir() {
-                match vault::purge_trash(vault_path.to_str().unwrap_or_default()) {
+                let vp_str = vault_path.to_str().unwrap_or_default();
+                match vault::purge_trash(vp_str) {
                     Ok(deleted) if !deleted.is_empty() => {
                         log::info!("Purged {} trashed files on startup", deleted.len());
                     }
@@ -163,6 +169,16 @@ pub fn run() {
                     }
                     _ => {}
                 }
+                // Migrate legacy is_a/Is A frontmatter to type
+                match vault::migrate_is_a_to_type(vp_str) {
+                    Ok(n) if n > 0 => {
+                        log::info!("Migrated {} files from is_a to type on startup", n);
+                    }
+                    Err(e) => {
+                        log::warn!("Failed to migrate is_a on startup: {}", e);
+                    }
+                    _ => {}
+                }
             }
 
             Ok(())
@@ -183,6 +199,7 @@ pub fn run() {
             ai_chat,
             save_image,
             purge_trash,
+            migrate_is_a_to_type,
             get_settings,
             save_settings,
             github_list_repos,

src-tauri/src/vault.rs

@@ -50,8 +50,12 @@ pub struct VaultEntry {
 /// Intermediate struct to capture YAML frontmatter fields.
 #[derive(Debug, Deserialize, Default)]
 struct Frontmatter {
-    #[serde(rename = "Is A")]
+    /// Legacy "Is A" / "is_a" field — migrated to `type` in new notes.
+    #[serde(rename = "Is A", alias = "is_a")]
     is_a: Option<StringOrList>,
+    /// New canonical "type" field (preferred over is_a).
+    #[serde(default, rename = "type")]
+    type_field: Option<StringOrList>,
     #[serde(default)]
     aliases: Option<StringOrList>,
     #[serde(rename = "Belongs to")]
@@ -232,6 +236,8 @@ fn parse_frontmatter(data: &HashMap<String, serde_json::Value>) -> Frontmatter {
 /// Only skip keys that can never contain wikilinks.
 const SKIP_KEYS: &[&str] = &[
     "is a",
+    "is_a",
+    "type",
     "aliases",
     "status",
     "cadence",
@@ -313,9 +319,14 @@ fn infer_type_from_folder(folder: &str) -> String {
     .to_string()
 }
 
-/// Resolve `is_a` from frontmatter, falling back to parent folder inference.
-fn resolve_is_a(fm_is_a: Option<StringOrList>, path: &Path) -> Option<String> {
-    fm_is_a
+/// Resolve note type: prefer `type` field, fall back to `is_a`, then parent folder inference.
+fn resolve_type(
+    type_field: Option<StringOrList>,
+    is_a: Option<StringOrList>,
+    path: &Path,
+) -> Option<String> {
+    type_field
+        .or(is_a)
         .and_then(|a| a.into_vec().into_iter().next())
         .or_else(|| {
             path.parent()
@@ -377,7 +388,7 @@ pub fn parse_md_file(path: &Path) -> Result<VaultEntry, String> {
     let snippet = extract_snippet(&content);
     let (modified_at, file_size) = read_file_metadata(path)?;
     let created_at = parse_created_at(&frontmatter);
-    let is_a = resolve_is_a(frontmatter.is_a, path);
+    let is_a = resolve_type(frontmatter.type_field, frontmatter.is_a, path);
 
     // Add "Type" relationship: isA becomes a navigable link to the type document.
     // Skip for type documents themselves (isA == "Type") to avoid self-referential links.
@@ -480,6 +491,120 @@ fn pod_to_json(pod: gray_matter::Pod) -> serde_json::Value {
     }
 }
 
+/// Check if a frontmatter section contains legacy `is_a` or `Is A` keys.
+fn has_legacy_is_a(fm_content: &str) -> bool {
+    fm_content.lines().any(|line| {
+        let t = line.trim_start();
+        t.starts_with("is_a:")
+            || t.starts_with("\"Is A\":")
+            || t.starts_with("'Is A':")
+            || t.starts_with("Is A:")
+    })
+}
+
+/// Extract the value from a legacy `is_a` / `Is A` line.
+fn extract_is_a_value(line: &str) -> Option<&str> {
+    let t = line.trim_start();
+    for prefix in &["is_a:", "\"Is A\":", "'Is A':", "Is A:"] {
+        if let Some(rest) = t.strip_prefix(prefix) {
+            let v = rest.trim();
+            return Some(v);
+        }
+    }
+    None
+}
+
+/// Migrate a single file's frontmatter from `is_a`/`Is A` to `type`.
+/// Returns Ok(true) if the file was modified, Ok(false) if no migration needed.
+fn migrate_file_is_a_to_type(path: &Path) -> Result<bool, String> {
+    let content =
+        fs::read_to_string(path).map_err(|e| format!("Failed to read {}: {}", path.display(), e))?;
+
+    if !content.starts_with("---\n") {
+        return Ok(false);
+    }
+    let fm_end = match content[4..].find("\n---") {
+        Some(i) => i + 4,
+        None => return Ok(false),
+    };
+    let fm_content = &content[4..fm_end];
+
+    if !has_legacy_is_a(fm_content) {
+        return Ok(false);
+    }
+
+    // Check if `type:` already exists
+    let has_type = fm_content.lines().any(|line| {
+        let t = line.trim_start();
+        t.starts_with("type:")
+    });
+
+    let mut new_lines: Vec<String> = Vec::new();
+    let mut is_a_value: Option<String> = None;
+
+    for line in fm_content.lines() {
+        if let Some(val) = extract_is_a_value(line) {
+            is_a_value = Some(val.to_string());
+            // Skip list continuations after is_a
+            continue;
+        }
+        new_lines.push(line.to_string());
+    }
+
+    // If type: doesn't exist and we found an is_a value, add type:
+    if !has_type {
+        if let Some(ref val) = is_a_value {
+            // Insert type: at the beginning (after other keys is fine too, but beginning is clean)
+            new_lines.insert(0, format!("type: {}", val));
+        }
+    }
+
+    let rest = &content[fm_end + 4..];
+    let new_content = format!("---\n{}\n---{}", new_lines.join("\n"), rest);
+
+    fs::write(path, &new_content)
+        .map_err(|e| format!("Failed to write {}: {}", path.display(), e))?;
+
+    Ok(true)
+}
+
+/// Migrate all markdown files in the vault from `is_a`/`Is A` to `type`.
+/// Returns the number of files migrated.
+pub fn migrate_is_a_to_type(vault_path: &str) -> Result<usize, String> {
+    let vault = Path::new(vault_path);
+    if !vault.exists() || !vault.is_dir() {
+        return Err(format!(
+            "Vault path does not exist or is not a directory: {}",
+            vault_path
+        ));
+    }
+
+    let mut migrated = 0;
+    for entry in WalkDir::new(vault)
+        .follow_links(true)
+        .into_iter()
+        .filter_map(|e| e.ok())
+    {
+        let path = entry.path();
+        if !path.is_file() || path.extension().map(|ext| ext != "md").unwrap_or(true) {
+            continue;
+        }
+
+        match migrate_file_is_a_to_type(path) {
+            Ok(true) => {
+                log::info!("Migrated is_a → type: {}", path.display());
+                migrated += 1;
+            }
+            Ok(false) => {}
+            Err(e) => {
+                log::warn!("Failed to migrate {}: {}", path.display(), e);
+            }
+        }
+    }
+
+    Ok(migrated)
+}
+
 /// Scan all markdown files in the vault and delete those where
 /// `Trashed at` frontmatter is more than 30 days ago.
 /// Returns the list of deleted file paths.

src/components/DynamicPropertiesPanel.tsx

@@ -27,8 +27,8 @@ export const RELATIONSHIP_KEYS = new Set([
   'Advances', 'Parent', 'Children', 'Has', 'Notes',
 ])
 
-// Keys to skip showing in Properties
-const SKIP_KEYS = new Set(['aliases', 'notion_id', 'workspace', 'is_a', 'Is A'])
+// Keys to skip showing in Properties (handled by dedicated UI or internal)
+const SKIP_KEYS = new Set(['aliases', 'notion_id', 'workspace', 'title', 'type', 'is_a', 'Is A'])
 
 // eslint-disable-next-line react-refresh/only-export-components -- utility co-located with component
 export function containsWikilinks(value: FrontmatterValue): boolean {

src/hooks/useNoteActions.test.ts

@@ -166,12 +166,12 @@ describe('entryMatchesTarget', () => {
 describe('buildNoteContent', () => {
   it('generates frontmatter with status for regular types', () => {
     const content = buildNoteContent('My Note', 'Note', 'Active')
-    expect(content).toBe('---\ntitle: My Note\nis_a: Note\nstatus: Active\n---\n\n# My Note\n\n')
+    expect(content).toBe('---\ntitle: My Note\ntype: Note\nstatus: Active\n---\n\n# My Note\n\n')
   })
 
   it('omits status when null', () => {
     const content = buildNoteContent('AI', 'Topic', null)
-    expect(content).toBe('---\ntitle: AI\nis_a: Topic\n---\n\n# AI\n\n')
+    expect(content).toBe('---\ntitle: AI\ntype: Topic\n---\n\n# AI\n\n')
   })
 })
 
@@ -181,7 +181,7 @@ describe('resolveNewNote', () => {
     expect(entry.path).toBe('/Users/luca/Laputa/project/my-project.md')
     expect(entry.isA).toBe('Project')
     expect(entry.status).toBe('Active')
-    expect(content).toContain('is_a: Project')
+    expect(content).toContain('type: Project')
     expect(content).toContain('status: Active')
   })
 
@@ -208,13 +208,14 @@ describe('resolveNewType', () => {
     expect(entry.path).toBe('/Users/luca/Laputa/type/recipe.md')
     expect(entry.isA).toBe('Type')
     expect(entry.status).toBeNull()
-    expect(content).toContain('Is A: Type')
+    expect(content).toContain('type: Type')
     expect(content).toContain('# Recipe')
   })
 })
 
 describe('frontmatterToEntryPatch', () => {
   it.each([
+    ['type', 'Project', { isA: 'Project' }],
     ['is_a', 'Project', { isA: 'Project' }],
     ['status', 'Done', { status: 'Done' }],
     ['color', 'red', { color: 'red' }],

src/hooks/useNoteActions.ts

@@ -112,7 +112,7 @@ const TYPE_FOLDER_MAP: Record<string, string> = {
 const NO_STATUS_TYPES = new Set(['Topic', 'Person'])
 
 const ENTRY_DELETE_MAP: Record<string, Partial<VaultEntry>> = {
-  is_a: { isA: null }, status: { status: null }, color: { color: null },
+  type: { isA: null }, is_a: { isA: null }, status: { status: null }, color: { color: null },
   icon: { icon: null }, owner: { owner: null }, cadence: { cadence: null },
   aliases: { aliases: [] }, belongs_to: { belongsTo: [] }, related_to: { relatedTo: [] },
   archived: { archived: false }, trashed: { trashed: false }, order: { order: null },
@@ -127,7 +127,7 @@ export function frontmatterToEntryPatch(
   const str = value != null ? String(value) : null
   const arr = Array.isArray(value) ? value.map(String) : []
   const updates: Record<string, Partial<VaultEntry>> = {
-    is_a: { isA: str }, status: { status: str }, color: { color: str },
+    type: { isA: str }, is_a: { isA: str }, status: { status: str }, color: { color: str },
     icon: { icon: str }, owner: { owner: str }, cadence: { cadence: str },
     aliases: { aliases: arr }, belongs_to: { belongsTo: arr }, related_to: { relatedTo: arr },
     archived: { archived: Boolean(value) }, trashed: { trashed: Boolean(value) },
@@ -142,7 +142,7 @@ function addEntryWithMock(entry: VaultEntry, content: string, addEntry: (e: Vaul
 }
 
 export function buildNoteContent(title: string, type: string, status: string | null): string {
-  const lines = ['---', `title: ${title}`, `is_a: ${type}`]
+  const lines = ['---', `title: ${title}`, `type: ${type}`]
   if (status) lines.push(`status: ${status}`)
   lines.push('---')
   return `${lines.join('\n')}\n\n# ${title}\n\n`
@@ -159,7 +159,7 @@ export function resolveNewNote(title: string, type: string): { entry: VaultEntry
 export function resolveNewType(typeName: string): { entry: VaultEntry; content: string } {
   const slug = slugify(typeName)
   const entry = buildNewEntry({ path: `/Users/luca/Laputa/type/${slug}.md`, slug, title: typeName, type: 'Type', status: null })
-  return { entry, content: `---\nIs A: Type\n---\n\n# ${typeName}\n\n` }
+  return { entry, content: `---\ntype: Type\n---\n\n# ${typeName}\n\n` }
 }
 
 function findWikilinkTarget(entries: VaultEntry[], target: string): VaultEntry | undefined {

src/mock-tauri.ts

@@ -24,7 +24,7 @@ async function checkVaultApi(): Promise<boolean> {
 const MOCK_CONTENT: Record<string, string> = {
   '/Users/luca/Laputa/project/26q1-laputa-app.md': `---
 title: Build Laputa App
-is_a: Project
+type: Project
 status: Active
 owner: Luca Rossi
 tags: [Tauri, React, TypeScript, CodeMirror]
@@ -102,7 +102,7 @@ function loadVault(path: string): VaultEntry[] {
 
 \`\`\`yaml
 title: Some Title
-is_a: Project
+type: Project
 status: Active
 \`\`\`
 
@@ -130,7 +130,7 @@ And this is a second paragraph to verify inter-paragraph spacing is correct. Goo
 `,
   '/Users/luca/Laputa/responsibility/grow-newsletter.md': `---
 title: Grow Newsletter
-is_a: Responsibility
+type: Responsibility
 status: Active
 owner: Luca Rossi
 ---
@@ -160,7 +160,7 @@ The newsletter is the *engine* that drives everything else — sponsorships, con
 `,
   '/Users/luca/Laputa/responsibility/manage-sponsorships.md': `---
 title: Manage Sponsorships
-is_a: Responsibility
+type: Responsibility
 status: Active
 owner: Matteo Cellini
 ---
@@ -184,7 +184,7 @@ Revenue stream from newsletter sponsorships. [[Matteo Cellini]] handles day-to-d
 `,
   '/Users/luca/Laputa/procedure/write-weekly-essays.md': `---
 title: Write Weekly Essays
-is_a: Procedure
+type: Procedure
 status: Active
 owner: Luca Rossi
 cadence: Weekly
@@ -228,7 +228,7 @@ belongs_to:
 `,
   '/Users/luca/Laputa/procedure/run-sponsorships.md': `---
 title: Run Sponsorships
-is_a: Procedure
+type: Procedure
 status: Active
 owner: Matteo Cellini
 cadence: Weekly
@@ -250,7 +250,7 @@ belongs_to:
 `,
   '/Users/luca/Laputa/experiment/stock-screener.md': `---
 title: Stock Screener — EMA200 Wick Bounce
-is_a: Experiment
+type: Experiment
 status: Active
 owner: Luca Rossi
 domains: [Finance, Quantitative Analysis]
@@ -285,7 +285,7 @@ Stocks that wick below the 200-day EMA and close above it show a **statistically
 `,
   '/Users/luca/Laputa/note/facebook-ads-strategy.md': `---
 title: Facebook Ads Strategy
-is_a: Note
+type: Note
 belongs_to:
   - "[[project/26q1-laputa-app]]"
 related_to:
@@ -310,7 +310,7 @@ related_to:
 `,
   '/Users/luca/Laputa/note/budget-allocation.md': `---
 title: Budget Allocation
-is_a: Note
+type: Note
 belongs_to:
   - "[[project/26q1-laputa-app]]"
 ---
@@ -330,7 +330,7 @@ belongs_to:
 `,
   '/Users/luca/Laputa/person/matteo-cellini.md': `---
 title: Matteo Cellini
-is_a: Person
+type: Person
 aliases:
   - Matteo
 ---
@@ -350,7 +350,7 @@ Sponsorship manager — handles all sponsor relationships, proposals, and report
 `,
   '/Users/luca/Laputa/event/2026-02-14-laputa-app-kickoff.md': `---
 title: Laputa App Design Session
-is_a: Event
+type: Event
 related_to:
   - "[[project/26q1-laputa-app]]"
   - "[[person/matteo-cellini]]"
@@ -378,7 +378,7 @@ related_to:
 `,
   '/Users/luca/Laputa/topic/software-development.md': `---
 title: Software Development
-is_a: Topic
+type: Topic
 aliases:
   - Dev
   - Coding
@@ -396,7 +396,7 @@ A broad topic covering everything from frontend to systems programming.
 `,
   '/Users/luca/Laputa/topic/trading.md': `---
 title: Trading
-is_a: Topic
+type: Topic
 aliases:
   - Algorithmic Trading
 ---
@@ -413,7 +413,7 @@ aliases:
 `,
   '/Users/luca/Laputa/essay/on-writing-well.md': `---
 title: On Writing Well
-is_a: Essay
+type: Essay
 Belongs to:
   - "[[responsibility/grow-newsletter]]"
 ---
@@ -424,7 +424,7 @@ Good writing is lean and confident. Every sentence should serve a purpose.
 `,
   '/Users/luca/Laputa/essay/engineering-leadership-101.md': `---
 title: Engineering Leadership 101
-is_a: Essay
+type: Essay
 Belongs to:
   - "[[responsibility/grow-newsletter]]"
 Related to:
@@ -437,7 +437,7 @@ The transition from IC to manager is the hardest career shift in engineering.
 `,
   '/Users/luca/Laputa/essay/ai-agents-primer.md': `---
 title: AI Agents Primer
-is_a: Essay
+type: Essay
 Belongs to:
   - "[[responsibility/grow-newsletter]]"
 ---
@@ -448,7 +448,7 @@ AI agents are autonomous systems that can plan, execute, and adapt to achieve go
 `,
   // --- Type documents ---
   '/Users/luca/Laputa/type/project.md': `---
-Is A: Type
+type: Type
 order: 0
 ---
 
@@ -462,7 +462,7 @@ A **time-bound initiative** that advances a [[type/responsibility|Responsibility
 - **Belongs to**: Usually a Quarter or Responsibility
 `,
   '/Users/luca/Laputa/type/responsibility.md': `---
-Is A: Type
+type: Type
 order: 1
 ---
 
@@ -475,7 +475,7 @@ An **ongoing area of ownership** — something you're accountable for indefinite
 - **Owner**: The person accountable
 `,
   '/Users/luca/Laputa/type/procedure.md': `---
-Is A: Type
+type: Type
 order: 2
 ---
 
@@ -490,7 +490,7 @@ A **recurring process** tied to a [[type/responsibility|Responsibility]]. Proced
 - **Belongs to**: A Responsibility
 `,
   '/Users/luca/Laputa/type/experiment.md': `---
-Is A: Type
+type: Type
 order: 3
 ---
 
@@ -503,7 +503,7 @@ A **hypothesis-driven investigation** with a clear test and measurable outcome.
 - **Owner**: The person running the experiment
 `,
   '/Users/luca/Laputa/type/person.md': `---
-Is A: Type
+type: Type
 order: 4
 ---
 
@@ -515,7 +515,7 @@ A **person** you interact with — team members, collaborators, contacts. People
 - **Aliases**: Alternative names for wikilink resolution
 `,
   '/Users/luca/Laputa/type/event.md': `---
-Is A: Type
+type: Type
 order: 5
 ---
 
@@ -527,7 +527,7 @@ A **point-in-time occurrence** — meetings, launches, milestones. Events are li
 - **Related to**: Entities this event is about
 `,
   '/Users/luca/Laputa/type/topic.md': `---
-Is A: Type
+type: Type
 order: 6
 ---
 
@@ -539,7 +539,7 @@ A **subject area** for categorization. Topics group related notes, projects, and
 - **Aliases**: Alternative names
 `,
   '/Users/luca/Laputa/type/essay.md': `---
-Is A: Type
+type: Type
 order: 7
 ---
 
@@ -551,7 +551,7 @@ A **published piece of writing** — newsletter essays, blog posts, articles. Es
 - **Belongs to**: Usually a Responsibility
 `,
   '/Users/luca/Laputa/type/note.md': `---
-Is A: Type
+type: Type
 order: 8
 ---
 
@@ -564,7 +564,7 @@ A **general-purpose document** — research notes, meeting notes, strategy docs.
 `,
   // --- Custom type documents (user-created types) ---
   '/Users/luca/Laputa/type/recipe.md': `---
-Is A: Type
+type: Type
 icon: cooking-pot
 color: orange
 ---
@@ -579,7 +579,7 @@ A **recipe** for cooking or baking. Recipes have ingredients, steps, and serving
 - **Cook Time**: Time to cook
 `,
   '/Users/luca/Laputa/type/book.md': `---
-Is A: Type
+type: Type
 icon: book-open
 color: green
 ---
@@ -596,7 +596,7 @@ A **book** you're reading or have read. Track reading progress, notes, and key t
   // --- Trashed entries ---
   '/Users/luca/Laputa/note/old-draft-notes.md': `---
 title: Old Draft Notes
-is_a: Note
+type: Note
 trashed: true
 trashed_at: ${new Date(Date.now() - 86400000 * 5).toISOString().slice(0, 10)}
 belongs_to:
@@ -609,7 +609,7 @@ Some rough draft content that is no longer relevant. Moving to trash.
 `,
   '/Users/luca/Laputa/note/deprecated-api-notes.md': `---
 title: Deprecated API Notes
-is_a: Note
+type: Note
 trashed: true
 trashed_at: ${new Date(Date.now() - 86400000 * 35).toISOString().slice(0, 10)}
 ---
@@ -620,7 +620,7 @@ Old API documentation for the v1 endpoint. Replaced by v2 docs.
 `,
   '/Users/luca/Laputa/experiment/failed-seo-experiment.md': `---
 title: Failed SEO Experiment
-is_a: Experiment
+type: Experiment
 status: Dropped
 trashed: true
 trashed_at: ${new Date(Date.now() - 86400000 * 10).toISOString().slice(0, 10)}
@@ -635,7 +635,7 @@ Tried programmatic SEO pages. Results were negligible — trashing this.
   // --- Archived entries ---
   '/Users/luca/Laputa/project/25q3-website-redesign.md': `---
 title: Website Redesign
-is_a: Project
+type: Project
 status: Done
 archived: true
 owner: Luca Rossi
@@ -654,7 +654,7 @@ Completed redesign of the company website. Migrated from WordPress to Next.js wi
 `,
   '/Users/luca/Laputa/experiment/twitter-thread-experiment.md': `---
 title: Twitter Thread Growth Experiment
-is_a: Experiment
+type: Experiment
 status: Done
 archived: true
 owner: Luca Rossi
@@ -676,7 +676,7 @@ Reverted to 1 high-quality thread per week. Archived this experiment.
   // --- Instances of custom types ---
   '/Users/luca/Laputa/recipe/pasta-carbonara.md': `---
 title: Pasta Carbonara
-is_a: Recipe
+type: Recipe
 servings: 4
 prep_time: 10 min
 cook_time: 20 min
@@ -695,7 +695,7 @@ Classic Roman pasta dish with eggs, pecorino, guanciale, and black pepper.
 `,
   '/Users/luca/Laputa/book/designing-data-intensive-applications.md': `---
 title: Designing Data-Intensive Applications
-is_a: Book
+type: Book
 author: Martin Kleppmann
 status: Finished
 rating: 5
@@ -1610,7 +1610,7 @@ index abc1234..def5678 100644
 @@ -1,8 +1,10 @@
  ---
  title: Example Note
- is_a: Note
+ type: Note
 +status: Active
  ---
 
@@ -1758,6 +1758,8 @@ const mockHandlers: Record<string, (args: any) => any> = {
     updated_at: new Date().toISOString(),
   }),
   clone_repo: (args: { url: string; local_path: string }) => `Cloned to ${args.local_path}`,
+  purge_trash: () => [],
+  migrate_is_a_to_type: () => 0,
 }
 
 export function isTauri(): boolean {