feat: In-memory search index with atuin daemon (#3201)

## Summary

This PR adds a persistent, in-memory search index to the Atuin daemon,
enabling fast fuzzy search without the startup delay of building an
index each time the TUI opens.

### Key Changes

- **Daemon search service**: A new gRPC service that maintains a Nucleo
fuzzy search index in memory
- **Real-time index updates**: The daemon listens for history events
(new commands, synced records) and updates the index immediately
- **Filter mode support**: All existing filter modes work (Global, Host,
Session, Directory, Workspace)
- **New search engine**: `daemon-fuzzy` search mode that queries the
daemon instead of building a local index
- **Paged history loading**: Database pagination support for efficient
initial index loading
- **Configurable logging**: New `[logs]` settings section for daemon and
search log configuration
- **Component-based daemon architecture**: Refactored daemon internals
into a modular, event-driven system
- **Fallback to DB search for regex**: Since Nucleo doesn't support
regex matching

## Daemon Architecture

The daemon has been refactored to use a component-based, event-driven
architecture that makes it easier to add new functionality and reason
about the system.

### Core Concepts

```
┌─────────────────────────────────────────────────────────────────────────────┐
│                              Atuin Daemon                                   │
│                                                                             │
│  ┌─────────────┐     ┌──────────────────────────────────────────────────┐   │
│  │   Daemon    │     │                  Components                      │   │
│  │   Handle    │────▶│                                                  │   │
│  │             │     │  ┌─────────────┐ ┌─────────────┐ ┌────────────┐  │   │
│  │ • emit()    │     │  │  History    │ │   Search    │ │    Sync    │  │   │
│  │ • subscribe │     │  │  Component  │ │  Component  │ │  Component │  │   │
│  │ • settings  │     │  │             │ │             │ │            │  │   │
│  │ • databases │     │  │ gRPC service│ │ gRPC service│ │ background │  │   │
│  └─────────────┘     │  │ WIP history │ │ Nucleo index│ │    sync    │  │   │
│         │            │  └─────────────┘ └─────────────┘ └────────────┘  │   │
│         │            └──────────────────────────────────────────────────┘   │
│         │                              ▲                                    │
│         ▼                              │                                    │
│  ┌─────────────────────────────────────┴────────────────────────────────┐   │
│  │                         Event Bus (broadcast)                        │   │
│  │                                                                      │   │
│  │  HistoryStarted │ HistoryEnded │ RecordsAdded │ SyncCompleted │ ...  │   │
│  └──────────────────────────────────────────────────────────────────────┘   │
│                                      ▲                                      │
│  ┌───────────────────────────────────┴──────────────────────────────────┐   │
│  │                    Control Service (gRPC)                            │   │
│  │           External event injection from CLI commands                 │   │
│  └──────────────────────────────────────────────────────────────────────┘   │
└─────────────────────────────────────────────────────────────────────────────┘
```

### DaemonHandle

A lightweight, cloneable handle that provides access to shared daemon
resources:

- **Event emission**: `handle.emit(DaemonEvent::...)` broadcasts to all
components
- **Event subscription**: `handle.subscribe()` returns a receiver for
the event bus
- **Settings**: `handle.settings()` for configuration access
- **Databases**: `handle.history_db()` and `handle.store()` for data
access

### Component Trait

Components implement a simple lifecycle:

```rust
#[async_trait]
trait Component: Send + Sync {
    fn name(&self) -> &'static str;
    async fn start(&mut self, handle: DaemonHandle) -> Result<()>;
    async fn handle_event(&mut self, event: &DaemonEvent) -> Result<()>;
    async fn stop(&mut self) -> Result<()>;
}
```

### Event-Driven Design

Components communicate via events rather than direct coupling:

| Event | Emitted By | Consumed By |
|-------|-----------|-------------|
| `HistoryStarted` | History gRPC | Search (logging) |
| `HistoryEnded` | History gRPC | Search (index update) |
| `RecordsAdded` | Sync | Search (index update) |
| `HistoryPruned` | CLI (via Control) | Search (index rebuild) |
| `HistoryDeleted` | CLI (via Control) | Search (index rebuild) |
| `ForceSync` | CLI (via Control) | Sync |
| `ShutdownRequested` | Signal handler | All (graceful shutdown) |

### External Event Injection

CLI commands can inject events into a running daemon:

```rust
// After `atuin history prune`
emit_event(DaemonEvent::HistoryPruned).await?;

// After deleting specific items
emit_event(DaemonEvent::HistoryDeleted { ids }).await?;

// Request immediate sync
emit_event(DaemonEvent::ForceSync).await?;
```

This ensures the daemon's search index stays in sync with database
changes made by CLI commands.

## Search Architecture

The search service uses a [forked version of
Nucleo](https://github.com/atuinsh/nucleo-ext) that adds filter and
scorer callbacks, enabling efficient filtering and frecency-based
ranking.

```
┌────────────────────────────────────────────────────────────────┐
│                         Atuin Daemon                           │
│                                                                │
│  ┌─────────────────┐    ┌──────────────────────────────────┐   │
│  │  Event System   │───▶│       Search Component           │   │
│  │                 │    │                                  │   │
│  │ • RecordsAdded  │    │  ┌────────────────────────────┐  │   │
│  │ • HistoryEnded  │    │  │   Deduplicated Index       │  │   │
│  │ • HistoryPruned │    │  │                            │  │   │
│  └─────────────────┘    │  │  CommandData per command:  │  │   │
│                         │  │  • Global frecency         │  │   │
│  ┌─────────────────┐    │  │  • Filter indexes (sets)   │  │   │
│  │ Background Task │    │  │  • Invocation history      │  │   │
│  │                 │    │  └────────────────────────────┘  │   │
│  │ Rebuilds        │    │               │                  │   │
│  │ frecency map    │    │               ▼                  │   │
│  │ every 60s       │───▶│  ┌────────────────────────────┐  │   │
│  └─────────────────┘    │  │   Nucleo (forked)          │  │   │
│                         │  │                            │  │   │
│                         │  │  • Filter callback         │  │   │
│                         │  │  • Scorer callback         │  │   │
│                         │  │  • Fuzzy matching          │  │   │
│                         │  └────────────────────────────┘  │   │
│                         └──────────────────────────────────┘   │
│                                      │                         │
│                                      │ gRPC (Unix socket)      │
└──────────────────────────────────────│─────────────────────────┘
                                       │
                                       ▼
┌─────────────────────────────────────────────────────────────────┐
│                      Search TUI (Client)                        │
│                                                                 │
│  1. Send query + filter mode + context to daemon                │
│  2. Receive matching history IDs (ranked by frecency)           │
│  3. Hydrate full records from local SQLite database             │
│  4. Display results in TUI                                      │
└─────────────────────────────────────────────────────────────────┘
```

### Nucleo Fork

The [nucleo-ext fork](https://github.com/atuinsh/nucleo-ext) adds two
key features to Nucleo:

1. **Filter callback**: Pre-filter items before fuzzy matching (used for
directory/host/session filtering)
2. **Scorer callback**: Compute custom scores after matching (used for
frecency ranking)

```rust
// Filter: only include commands run in current directory
nucleo.set_filter(Some(Arc::new(|cmd: &String| {
    passing_commands.contains(cmd)
})));

// Scorer: combine fuzzy score with frecency
nucleo.set_scorer(Some(Arc::new(|cmd: &String, fuzzy_score: u32| {
    let frecency = frecency_map.get(cmd).unwrap_or(0);
    fuzzy_score + (frecency * 10)
})));
```

### Deduplicated Index

Commands are stored once per unique command text, with metadata tracking
all invocations:

```rust
struct CommandData {
    command: String,
    invocations: Vec<Invocation>,      // All times this command was run
    global_frecency: FrecencyData,     // Precomputed frecency score

    // O(1) filter indexes
    directories: HashSet<String>,      // All cwds where command was run
    hosts: HashSet<String>,            // All hostnames
    sessions: HashSet<String>,         // All session IDs
}
```

This deduplication means:
- **Fewer items to match**: ~13K unique commands vs ~62K history entries
- **O(1) filter checks**: HashSet lookups instead of scanning
invocations
- **Single frecency score**: Global frecency computed once, used for all
filter modes

### Frecency Scoring

Frecency (frequency + recency) scoring prioritizes recently and
frequently used commands:

```rust
fn compute_frecency(count: u32, last_used: i64, now: i64) -> u32 {
    let age_hours = (now - last_used) / 3600;

    // Recency: decays over time (half-life ~24 hours)
    let recency = (100.0 * (-age_hours as f64 / 24.0).exp()) as u32;

    // Frequency: logarithmic scaling
    let frequency = (count.ln() * 20.0).min(100.0) as u32;

    recency + frequency
}
```

The frecency map is:
- **Precomputed by background task** every 60 seconds
- **Never computed inline** during search (no latency impact)
- **Graceful fallback**: If unavailable, search works without frecency
ranking

### Filter Mode Implementation

| Filter Mode | Implementation |
|-------------|----------------|
| Global | No filter (all commands) |
| Directory | `command.directories.contains(cwd)` |
| Workspace | `command.directories.any(\|d\| d.starts_with(git_root))` |
| Host | `command.hosts.contains(hostname)` |
| Session | `command.sessions.contains(session_id)` |

Filters are pre-computed into a HashSet before the search, making the
filter callback O(1).

### Search Flow

1. **Daemon startup**: Loads history from SQLite in pages, builds
deduplicated index
2. **Frecency precompute**: Background task builds frecency map after
history loads
3. **Search request**: Client sends query with filter mode and context
4. **Filter**: Pre-computed HashSet determines which commands pass the
filter
5. **Match**: Nucleo fuzzy matches the query against command text
6. **Score**: Frecency scorer ranks results (fuzzy score + frecency *
10)
7. **Response**: Returns history IDs for the most recent invocation of
each matching command
8. **Hydration**: Client fetches full records from local SQLite

### Configuration

```toml
# Enable daemon + autostart
[daemon]
enabled = true
autostart = true

# Enable daemon-based fuzzy search
[search]
search_mode = "daemon-fuzzy"
```

## Performance

Performance varies based on several factors, but in most initial testing
with the new architecture shows improvement:

* **Nucleo performs searches up to 4.5x faster**: direct DB search
averages 18.07ms, but the daemon completes the same queries in 3.99ms.
* **IPC overhead is significant, but acceptable**: a significant amount
of wall-time is taken up by the transfer of data over IPC (via UDS in
this case). This averages to about ~7.8ms and accounts for 66% of
client-side wall time.
* **Tail latency improves at every layer**: p99 times correspond to
initial requests, worst-case query patterns, etc. but the average p99
daemon-based response time is 3.6x better than the associated DB-based
search p99 time
* **Query complexity no longer impacts performance**: the Nucleo-based
search shows consistent 2-7ms times regardless of query pattern. The
DB-based search had a 17x variance (3.59ms to 62.46ms).

Interestingly, @ellie - who has a larger history store than I do - gets
even better performance on the IPC layer. This could use a lot more
testing in various edge cases and on various hardware, but seems
promising.

### Regular DB search

```
Individual calls for: db_search
--------------------------------------------------------------------------------------------------------------
   #        Wall        Busy        Idle  Fields
--------------------------------------------------------------------------------------------------------------
   1     32.25ms     32.20ms     47.70µs  {"mode":"Fuzzy","query":"^"}
   2     19.48ms     19.40ms     84.20µs  {"mode":"Fuzzy","query":"^c"}
   3     20.40ms     20.10ms    297.00µs  {"mode":"Fuzzy","query":"^ca"}
   4     13.07ms     13.00ms     69.90µs  {"mode":"Fuzzy","query":"^car"}
   5     12.17ms     12.10ms     67.10µs  {"mode":"Fuzzy","query":"^carg"}
   6     20.78ms     20.70ms     76.60µs  {"mode":"Fuzzy","query":"^cargo"}
   7      9.15ms      9.10ms     53.20µs  {"mode":"Fuzzy","query":"^cargo "}
   8     10.24ms     10.00ms    237.00µs  {"mode":"Fuzzy","query":"^cargo b"}
   9     10.01ms      9.68ms    325.00µs  {"mode":"Fuzzy","query":"^cargo bu"}
  10      5.89ms      5.83ms     57.20µs  {"mode":"Fuzzy","query":"^cargo bui"}
  11      8.85ms      8.28ms    568.00µs  {"mode":"Fuzzy","query":"^cargo buil"}
  12      7.70ms      7.49ms    212.00µs  {"mode":"Fuzzy","query":"^cargo build"}
  13      3.59ms      3.53ms     57.00µs  {"mode":"Fuzzy","query":"^cargo build$"}
  14      6.50ms      6.44ms     63.60µs  {"mode":"Fuzzy","query":"^cargo "}
  15      6.48ms      6.38ms    100.00µs  {"mode":"Fuzzy","query":"!"}
  16     31.68ms     31.60ms     75.90µs  {"mode":"Fuzzy","query":"!g"}
  17     62.46ms     62.40ms     58.90µs  {"mode":"Fuzzy","query":"!gi"}
  18     30.35ms     30.30ms     46.90µs  {"mode":"Fuzzy","query":"!git"}
  19     53.84ms     53.80ms     40.80µs  {"mode":"Fuzzy","query":"!git "}
  20     19.24ms     19.20ms     39.70µs  {"mode":"Fuzzy","query":"!git c"}
  21     22.03ms     22.00ms     34.70µs  {"mode":"Fuzzy","query":"!git co"}
  22     17.13ms     17.00ms    133.00µs  {"mode":"Fuzzy","query":"!git com"}
  23     16.14ms     15.90ms    242.00µs  {"mode":"Fuzzy","query":"!git comm"}
  24      5.11ms      5.08ms     28.60µs  {"mode":"Fuzzy","query":"!git commi"}
  25      7.31ms      7.26ms     52.70µs  {"mode":"Fuzzy","query":"!git commit"}

Summary: 25 calls
  Wall: avg=18.07ms, min=3.59ms, max=62.46ms, p50=13.07ms, p99=62.46ms
  Busy: avg=17.95ms, min=3.53ms, max=62.40ms, p50=13.00ms, p99=62.40ms
```

### Daemon-based search

**Client**

```
Individual calls for: daemon_search
--------------------------------------------------------------------------------------------------------------
   #        Wall        Busy        Idle  Fields
--------------------------------------------------------------------------------------------------------------
   1     13.05ms      2.55ms     10.50ms  {"query":"^"}
   2     10.65ms      1.40ms      9.25ms  {"query":"^c"}
   3     10.72ms      1.18ms      9.54ms  {"query":"^ca"}
   4      5.54ms    485.00µs      5.06ms  {"query":"^car"}
   5     15.02ms      1.02ms     14.00ms  {"query":"^carg"}
   6      9.49ms    840.00µs      8.65ms  {"query":"^cargo"}
   7      5.53ms    555.00µs      4.97ms  {"query":"^cargo "}
   8      8.56ms    717.00µs      7.84ms  {"query":"^cargo b"}
   9     12.34ms      1.24ms     11.10ms  {"query":"^cargo bu"}
  10      8.38ms    650.00µs      7.73ms  {"query":"^cargo bui"}
  11     13.07ms    770.00µs     12.30ms  {"query":"^cargo buil"}
  12     17.11ms    709.00µs     16.40ms  {"query":"^cargo build"}
  13     15.41ms    907.00µs     14.50ms  {"query":"^cargo build$"}
  14      8.19ms    665.00µs      7.52ms  {"query":"^cargo "}
  15      7.98ms      1.72ms      6.26ms  {"query":"!"}
  16     13.56ms    856.00µs     12.70ms  {"query":"!g"}
  17      8.11ms    624.00µs      7.49ms  {"query":"!gi"}
  18     14.57ms    775.00µs     13.80ms  {"query":"!git"}
  19     14.18ms    779.00µs     13.40ms  {"query":"!git "}
  20      9.62ms    802.00µs      8.82ms  {"query":"!git c"}
  21     15.50ms      1.50ms     14.00ms  {"query":"!git co"}
  22     11.58ms      1.48ms     10.10ms  {"query":"!git com"}
  23     13.82ms      2.12ms     11.70ms  {"query":"!git comm"}
  24     17.48ms      2.18ms     15.30ms  {"query":"!git commi"}
  25     14.81ms      1.71ms     13.10ms  {"query":"!git commit"}

Summary: 25 calls
  Wall: avg=11.77ms, min=5.53ms, max=17.48ms, p50=12.34ms, p99=17.48ms
  Busy: avg=1.13ms, min=485.00µs, max=2.55ms, p50=856.00µs, p99=2.55ms
```

**Daemon**

```
Individual calls for: daemon_search_query
--------------------------------------------------------------------------------------------------------------
   #        Wall        Busy        Idle  Fields
--------------------------------------------------------------------------------------------------------------
   1      1.75ms       250ns      1.75ms  {"query":"^","query_id":1}
   2      4.58ms       125ns      4.58ms  {"query":"^c","query_id":2}
   3      4.39ms       250ns      4.39ms  {"query":"^ca","query_id":3}
   4      2.52ms       125ns      2.52ms  {"query":"^car","query_id":4}
   5      4.44ms       250ns      4.44ms  {"query":"^carg","query_id":5}
   6      3.66ms       167ns      3.66ms  {"query":"^cargo","query_id":6}
   7      2.38ms        84ns      2.38ms  {"query":"^cargo ","query_id":7}
   8      4.13ms        84ns      4.13ms  {"query":"^cargo b","query_id":8}
   9      4.40ms       167ns      4.40ms  {"query":"^cargo bu","query_id":9}
  10      3.87ms       125ns      3.87ms  {"query":"^cargo bui","query_id":10}
  11      4.36ms        84ns      4.36ms  {"query":"^cargo buil","query_id":11}
  12      3.96ms       333ns      3.96ms  {"query":"^cargo build","query_id":12}
  13      4.61ms       167ns      4.61ms  {"query":"^cargo build$","query_id":13}
  14      4.20ms       209ns      4.20ms  {"query":"^cargo ","query_id":14}
  15    238.17µs       167ns    238.00µs  {"query":"!","query_id":15}
  16      4.44ms       125ns      4.44ms  {"query":"!g","query_id":16}
  17      3.47ms        83ns      3.47ms  {"query":"!gi","query_id":17}
  18      4.57ms       125ns      4.57ms  {"query":"!git","query_id":18}
  19      7.15ms       167ns      7.15ms  {"query":"!git ","query_id":19}
  20      4.27ms       250ns      4.27ms  {"query":"!git c","query_id":20}
  21      5.19ms       292ns      5.19ms  {"query":"!git co","query_id":21}
  22      4.29ms       417ns      4.29ms  {"query":"!git com","query_id":22}
  23      4.08ms       125ns      4.08ms  {"query":"!git comm","query_id":23}
  24      4.50ms       167ns      4.50ms  {"query":"!git commi","query_id":24}
  25      4.35ms       208ns      4.35ms  {"query":"!git commit","query_id":25}

Summary: 25 calls
  Wall: avg=3.99ms, min=238.17µs, max=7.15ms, p50=4.29ms, p99=7.15ms
  Busy: avg=182ns, min=83ns, max=417ns, p50=167ns, p99=417ns
```

**Nucleo matching time (in daemon)**

```
Individual calls for: nucleo_match
--------------------------------------------------------------------------------------------------------------
   #        Wall        Busy        Idle  Fields
--------------------------------------------------------------------------------------------------------------
   1      1.73ms       125ns      1.73ms  {"query":"^","query_id":1}
   2      4.57ms       167ns      4.57ms  {"query":"^c","query_id":2}
   3      4.37ms       125ns      4.37ms  {"query":"^ca","query_id":3}
   4      2.51ms        84ns      2.51ms  {"query":"^car","query_id":4}
   5      4.43ms       125ns      4.43ms  {"query":"^carg","query_id":5}
   6      3.64ms       125ns      3.64ms  {"query":"^cargo","query_id":6}
   7      2.37ms        84ns      2.37ms  {"query":"^cargo ","query_id":7}
   8      4.11ms       125ns      4.11ms  {"query":"^cargo b","query_id":8}
   9      4.36ms       208ns      4.36ms  {"query":"^cargo bu","query_id":9}
  10      3.85ms       125ns      3.85ms  {"query":"^cargo bui","query_id":10}
  11      4.35ms       125ns      4.35ms  {"query":"^cargo buil","query_id":11}
  12      3.94ms       250ns      3.94ms  {"query":"^cargo build","query_id":12}
  13      4.59ms       125ns      4.59ms  {"query":"^cargo build$","query_id":13}
  14      4.18ms        84ns      4.18ms  {"query":"^cargo ","query_id":14}
  15    220.13µs       125ns    220.00µs  {"query":"!","query_id":15}
  16      4.43ms       125ns      4.43ms  {"query":"!g","query_id":16}
  17      3.45ms       125ns      3.45ms  {"query":"!gi","query_id":17}
  18      4.55ms       125ns      4.55ms  {"query":"!git","query_id":18}
  19      7.12ms       209ns      7.12ms  {"query":"!git ","query_id":19}
  20      4.25ms       166ns      4.25ms  {"query":"!git c","query_id":20}
  21      5.18ms       125ns      5.18ms  {"query":"!git co","query_id":21}
  22      4.27ms       125ns      4.27ms  {"query":"!git com","query_id":22}
  23      4.06ms       292ns      4.06ms  {"query":"!git comm","query_id":23}
  24      4.46ms       166ns      4.46ms  {"query":"!git commi","query_id":24}
  25      4.31ms       208ns      4.31ms  {"query":"!git commit","query_id":25}

Summary: 25 calls
  Wall: avg=3.97ms, min=220.13µs, max=7.12ms, p50=4.27ms, p99=7.12ms
  Busy: avg=147ns, min=84ns, max=292ns, p50=125ns, p99=292ns
```

4 files changed, 925 insertions, 0 deletions

diff --git a/crates/atuin-daemon/src/components/history.rs b/crates/atuin-daemon/src/components/history.rs
new file mode 100644
index 00000000..23d48c5e
--- /dev/null
+++ b/crates/atuin-daemon/src/components/history.rs
@@ -0,0 +1,252 @@
+//! History component.
+//!
+//! Handles command history lifecycle (start/end) and provides the History gRPC service.
+
+use std::sync::Arc;
+
+use atuin_client::{
+    database::Database,
+    history::{History, HistoryId, store::HistoryStore},
+    settings::Settings,
+};
+use dashmap::DashMap;
+use eyre::Result;
+use time::OffsetDateTime;
+use tonic::{Request, Response, Status};
+use tracing::{Level, instrument};
+
+use crate::{
+    daemon::{Component, DaemonHandle},
+    events::DaemonEvent,
+    history::{
+        EndHistoryReply, EndHistoryRequest, ShutdownReply, ShutdownRequest, StartHistoryReply,
+        StartHistoryRequest, StatusReply, StatusRequest,
+        history_server::{History as HistorySvc, HistoryServer},
+    },
+};
+
+const DAEMON_PROTOCOL_VERSION: u32 = 1;
+
+/// History component - manages command history lifecycle.
+///
+/// This component:
+/// - Tracks currently running commands (stored in memory)
+/// - Saves completed commands to the database and record store
+/// - Emits history events for other components (e.g., search indexing)
+/// - Provides the History gRPC service
+pub struct HistoryComponent {
+    inner: Arc<HistoryComponentInner>,
+}
+
+struct HistoryComponentInner {
+    /// Commands currently running (not yet completed).
+    running: DashMap<HistoryId, History>,
+
+    /// Handle to the daemon (set during start).
+    handle: tokio::sync::RwLock<Option<DaemonHandle>>,
+
+    /// History store for pushing records (set during start).
+    history_store: tokio::sync::RwLock<Option<HistoryStore>>,
+}
+
+impl HistoryComponent {
+    /// Create a new history component.
+    pub fn new() -> Self {
+        Self {
+            inner: Arc::new(HistoryComponentInner {
+                running: DashMap::new(),
+                handle: tokio::sync::RwLock::new(None),
+                history_store: tokio::sync::RwLock::new(None),
+            }),
+        }
+    }
+
+    /// Get the gRPC service for this component.
+    ///
+    /// This returns a tonic service that can be added to a gRPC server.
+    pub fn grpc_service(&self) -> HistoryServer<HistoryGrpcService> {
+        HistoryServer::new(HistoryGrpcService {
+            inner: self.inner.clone(),
+        })
+    }
+}
+
+impl Default for HistoryComponent {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[tonic::async_trait]
+impl Component for HistoryComponent {
+    fn name(&self) -> &'static str {
+        "history"
+    }
+
+    async fn start(&mut self, handle: DaemonHandle) -> Result<()> {
+        // Create the history store
+        let host_id = Settings::host_id().await?;
+        let history_store =
+            HistoryStore::new(handle.store().clone(), host_id, *handle.encryption_key());
+
+        *self.inner.history_store.write().await = Some(history_store);
+        *self.inner.handle.write().await = Some(handle);
+
+        tracing::info!("history component started");
+        Ok(())
+    }
+
+    async fn handle_event(&mut self, _event: &DaemonEvent) -> Result<()> {
+        // History component produces events but doesn't need to react to them
+        Ok(())
+    }
+
+    async fn stop(&mut self) -> Result<()> {
+        tracing::info!("history component stopped");
+        Ok(())
+    }
+}
+
+/// The gRPC service implementation.
+///
+/// This is a thin wrapper that delegates to the component's shared state.
+pub struct HistoryGrpcService {
+    inner: Arc<HistoryComponentInner>,
+}
+
+#[tonic::async_trait]
+impl HistorySvc for HistoryGrpcService {
+    #[instrument(skip_all, level = Level::INFO)]
+    async fn start_history(
+        &self,
+        request: Request<StartHistoryRequest>,
+    ) -> Result<Response<StartHistoryReply>, Status> {
+        let req = request.into_inner();
+
+        let timestamp =
+            OffsetDateTime::from_unix_timestamp_nanos(req.timestamp as i128).map_err(|_| {
+                Status::invalid_argument(
+                    "failed to parse timestamp as unix time (expected nanos since epoch)",
+                )
+            })?;
+
+        let h: History = History::daemon()
+            .timestamp(timestamp)
+            .command(req.command)
+            .cwd(req.cwd)
+            .session(req.session)
+            .hostname(req.hostname)
+            .build()
+            .into();
+
+        // Emit the event
+        if let Some(handle) = self.inner.handle.read().await.as_ref() {
+            handle.emit(DaemonEvent::HistoryStarted(h.clone()));
+        }
+
+        let id = h.id.clone();
+        tracing::info!(id = id.to_string(), "start history");
+        self.inner.running.insert(id.clone(), h);
+
+        let reply = StartHistoryReply {
+            id: id.to_string(),
+            version: env!("CARGO_PKG_VERSION").to_string(),
+            protocol: DAEMON_PROTOCOL_VERSION,
+        };
+
+        Ok(Response::new(reply))
+    }
+
+    #[instrument(skip_all, level = Level::INFO)]
+    async fn end_history(
+        &self,
+        request: Request<EndHistoryRequest>,
+    ) -> Result<Response<EndHistoryReply>, Status> {
+        let req = request.into_inner();
+        let id = HistoryId(req.id);
+
+        if let Some((_, mut history)) = self.inner.running.remove(&id) {
+            history.exit = req.exit;
+            history.duration = match req.duration {
+                0 => i64::try_from(
+                    (OffsetDateTime::now_utc() - history.timestamp).whole_nanoseconds(),
+                )
+                .expect("failed to convert calculated duration to i64"),
+                value => i64::try_from(value).expect("failed to get i64 duration"),
+            };
+
+            // Get the handle and store to save the history
+            let handle_guard = self.inner.handle.read().await;
+            let handle = handle_guard
+                .as_ref()
+                .ok_or_else(|| Status::internal("component not initialized"))?;
+
+            let store_guard = self.inner.history_store.read().await;
+            let history_store = store_guard
+                .as_ref()
+                .ok_or_else(|| Status::internal("component not initialized"))?;
+
+            // Save to database
+            handle
+                .history_db()
+                .save(&history)
+                .await
+                .map_err(|e| Status::internal(format!("failed to write to db: {e:?}")))?;
+
+            tracing::info!(
+                id = id.0.to_string(),
+                duration = history.duration,
+                "end history"
+            );
+
+            // Push to record store
+            let (record_id, idx) = history_store
+                .push(history.clone())
+                .await
+                .map_err(|e| Status::internal(format!("failed to push record to store: {e:?}")))?;
+
+            // Emit the event
+            handle.emit(DaemonEvent::HistoryEnded(history));
+
+            let reply = EndHistoryReply {
+                id: record_id.0.to_string(),
+                idx,
+                version: env!("CARGO_PKG_VERSION").to_string(),
+                protocol: DAEMON_PROTOCOL_VERSION,
+            };
+
+            return Ok(Response::new(reply));
+        }
+
+        Err(Status::not_found(format!(
+            "could not find history with id: {id}"
+        )))
+    }
+
+    #[instrument(skip_all, level = Level::INFO)]
+    async fn status(
+        &self,
+        _request: Request<StatusRequest>,
+    ) -> Result<Response<StatusReply>, Status> {
+        let reply = StatusReply {
+            healthy: true,
+            version: env!("CARGO_PKG_VERSION").to_string(),
+            pid: std::process::id(),
+            protocol: DAEMON_PROTOCOL_VERSION,
+        };
+
+        Ok(Response::new(reply))
+    }
+
+    #[instrument(skip_all, level = Level::INFO)]
+    async fn shutdown(
+        &self,
+        _request: Request<ShutdownRequest>,
+    ) -> Result<Response<ShutdownReply>, Status> {
+        // Use the daemon handle to request shutdown
+        if let Some(handle) = self.inner.handle.read().await.as_ref() {
+            handle.shutdown();
+        }
+        Ok(Response::new(ShutdownReply { accepted: true }))
+    }
+}
diff --git a/crates/atuin-daemon/src/components/mod.rs b/crates/atuin-daemon/src/components/mod.rs
new file mode 100644
index 00000000..5950d5d5
--- /dev/null
+++ b/crates/atuin-daemon/src/components/mod.rs
@@ -0,0 +1,22 @@
+//! Daemon components.
+//!
+//! Components are the building blocks of the daemon. Each component handles
+//! a specific domain and can:
+//!
+//! - Expose gRPC services
+//! - React to events
+//! - Spawn background tasks
+//!
+//! Available components:
+//!
+//! - [`history::HistoryComponent`]: Command history lifecycle management
+//! - [`search::SearchComponent`]: Fuzzy search over history
+//! - [`sync::SyncComponent`]: Cloud sync
+
+pub mod history;
+pub mod search;
+pub mod sync;
+
+pub use history::HistoryComponent;
+pub use search::SearchComponent;
+pub use sync::SyncComponent;
diff --git a/crates/atuin-daemon/src/components/search.rs b/crates/atuin-daemon/src/components/search.rs
new file mode 100644
index 00000000..7fb59dea
--- /dev/null
+++ b/crates/atuin-daemon/src/components/search.rs
@@ -0,0 +1,394 @@
+//! Search component.
+//!
+//! Provides fuzzy search over command history using the Nucleo search library
+//! with frecency-based ranking and dynamic filtering.
+
+use std::{pin::Pin, sync::Arc};
+
+use atuin_client::database::Database;
+use eyre::Result;
+use tokio::sync::RwLock;
+use tokio_stream::Stream;
+use tonic::{Request, Response, Status, Streaming};
+use tracing::{Level, debug, info, instrument, span, trace};
+use uuid::Uuid;
+
+use crate::{
+    daemon::{Component, DaemonHandle},
+    events::DaemonEvent,
+    search::{
+        FilterMode, IndexFilterMode, QueryContext, SearchIndex, SearchRequest, SearchResponse,
+        search_server::{Search as SearchSvc, SearchServer},
+    },
+};
+
+const PAGE_SIZE: usize = 5000;
+const RESULTS_LIMIT: u32 = 200;
+/// How often to rebuild the frecency map (in seconds).
+const FRECENCY_REFRESH_INTERVAL_SECS: u64 = 60;
+
+/// Search component - provides fuzzy search over command history.
+///
+/// This component:
+/// - Maintains a deduplicated search index with frecency ranking
+/// - Loads history from the database on startup
+/// - Updates the index when history events occur
+/// - Provides the Search gRPC service
+pub struct SearchComponent {
+    index: Arc<RwLock<SearchIndex>>,
+    handle: tokio::sync::RwLock<Option<DaemonHandle>>,
+    loader_handle: Option<tokio::task::JoinHandle<()>>,
+    frecency_handle: Option<tokio::task::JoinHandle<()>>,
+}
+
+impl SearchComponent {
+    /// Create a new search component.
+    pub fn new() -> Self {
+        Self {
+            index: Arc::new(RwLock::new(SearchIndex::new())),
+            handle: tokio::sync::RwLock::new(None),
+            loader_handle: None,
+            frecency_handle: None,
+        }
+    }
+
+    /// Get the gRPC service for this component.
+    pub fn grpc_service(&self) -> SearchServer<SearchGrpcService> {
+        SearchServer::new(SearchGrpcService {
+            index: self.index.clone(),
+        })
+    }
+
+    /// Rebuild the entire search index from the database.
+    async fn rebuild_index(&self) -> Result<()> {
+        let handle_guard = self.handle.read().await;
+        let handle = handle_guard
+            .as_ref()
+            .ok_or_else(|| eyre::eyre!("component not initialized"))?;
+
+        info!("Rebuilding search index from database");
+
+        // Create a new index
+        let new_index = SearchIndex::new();
+
+        // Load all history into the new index
+        let db = handle.history_db().clone();
+        let mut pager = db.all_paged(PAGE_SIZE, false, true);
+        loop {
+            match pager.next().await {
+                Ok(Some(histories)) => {
+                    info!(
+                        "Loading {} history entries into search index",
+                        histories.len()
+                    );
+                    new_index.add_histories(&histories);
+                }
+                Ok(None) => break,
+                Err(e) => {
+                    tracing::error!("Failed to load history during rebuild: {}", e);
+                    break;
+                }
+            }
+        }
+
+        info!(
+            "Search index rebuild complete; {} unique commands",
+            new_index.command_count()
+        );
+
+        // Replace the old index with the new one
+        *self.index.write().await = new_index;
+        Ok(())
+    }
+}
+
+impl Default for SearchComponent {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[tonic::async_trait]
+impl Component for SearchComponent {
+    fn name(&self) -> &'static str {
+        "search"
+    }
+
+    async fn start(&mut self, handle: DaemonHandle) -> Result<()> {
+        *self.handle.write().await = Some(handle.clone());
+
+        // Spawn background task to load history into index
+        let index = self.index.clone();
+        let db = handle.history_db().clone();
+
+        self.loader_handle = Some(tokio::spawn(async move {
+            info!(
+                "Loading history into search index; page size = {}",
+                PAGE_SIZE
+            );
+            let mut pager = db.all_paged(PAGE_SIZE, false, true);
+            loop {
+                match pager.next().await {
+                    Ok(Some(histories)) => {
+                        info!(
+                            "Loading {} history entries into search index",
+                            histories.len()
+                        );
+                        index.read().await.add_histories(&histories);
+                    }
+                    Ok(None) => {
+                        info!(
+                            "Initial history load complete; {} unique commands indexed",
+                            index.read().await.command_count()
+                        );
+                        // Build initial frecency map
+                        index.read().await.rebuild_frecency().await;
+                        info!("Initial frecency map built");
+                        break;
+                    }
+                    Err(e) => {
+                        tracing::error!("Failed to load history: {}", e);
+                        break;
+                    }
+                }
+            }
+        }));
+
+        // Spawn background task to periodically refresh frecency
+        let index_for_frecency = self.index.clone();
+        self.frecency_handle = Some(tokio::spawn(async move {
+            let mut interval = tokio::time::interval(std::time::Duration::from_secs(
+                FRECENCY_REFRESH_INTERVAL_SECS,
+            ));
+            loop {
+                interval.tick().await;
+                trace!("Refreshing frecency map");
+                index_for_frecency.read().await.rebuild_frecency().await;
+            }
+        }));
+
+        tracing::info!("search component started");
+        Ok(())
+    }
+
+    async fn handle_event(&mut self, event: &DaemonEvent) -> Result<()> {
+        match event {
+            DaemonEvent::RecordsAdded(records) => {
+                debug!(
+                    count = records.len(),
+                    "Processing added records for search index"
+                );
+
+                let handle_guard = self.handle.read().await;
+                if let Some(handle) = handle_guard.as_ref() {
+                    let histories: Vec<_> = handle
+                        .history_db()
+                        .query_history(
+                            format!(
+                                "select * from history where id in ({})",
+                                records
+                                    .iter()
+                                    .map(|record| record.0.to_string())
+                                    .collect::<Vec<_>>()
+                                    .join(",")
+                            )
+                            .as_str(),
+                        )
+                        .await
+                        .unwrap_or_default();
+
+                    span!(Level::TRACE, "inject_records", count = histories.len())
+                        .in_scope(async || {
+                            self.index.read().await.add_histories(&histories);
+                        })
+                        .await;
+                }
+            }
+            DaemonEvent::HistoryStarted(history) => {
+                debug!(id = %history.id, command = %history.command, "History started (no index action)");
+            }
+            DaemonEvent::HistoryEnded(history) => {
+                span!(Level::TRACE, "inject_history_ended")
+                    .in_scope(async || {
+                        self.index.read().await.add_history(history);
+                    })
+                    .await;
+            }
+            DaemonEvent::HistoryPruned | DaemonEvent::HistoryRebuilt => {
+                info!("History store pruned or rebuilt, rebuilding search index");
+                if let Err(e) = self.rebuild_index().await {
+                    tracing::error!("Failed to rebuild search index: {}", e);
+                }
+            }
+            DaemonEvent::HistoryDeleted { ids } => {
+                info!(
+                    count = ids.len(),
+                    "History deleted, rebuilding search index"
+                );
+                // For now, just rebuild the entire index. A more efficient implementation
+                // would remove specific items from the index.
+                if let Err(e) = self.rebuild_index().await {
+                    tracing::error!("Failed to rebuild search index: {}", e);
+                }
+            }
+            // Events we don't care about
+            DaemonEvent::SyncCompleted { .. }
+            | DaemonEvent::SyncFailed { .. }
+            | DaemonEvent::ForceSync
+            | DaemonEvent::SettingsReloaded
+            | DaemonEvent::ShutdownRequested => {}
+        }
+        Ok(())
+    }
+
+    async fn stop(&mut self) -> Result<()> {
+        if let Some(handle) = self.loader_handle.take() {
+            handle.abort();
+        }
+        if let Some(handle) = self.frecency_handle.take() {
+            handle.abort();
+        }
+        tracing::info!("search component stopped");
+        Ok(())
+    }
+}
+
+/// The gRPC service implementation.
+pub struct SearchGrpcService {
+    index: Arc<RwLock<SearchIndex>>,
+}
+
+#[tonic::async_trait]
+impl SearchSvc for SearchGrpcService {
+    type SearchStream = Pin<Box<dyn Stream<Item = Result<SearchResponse, Status>> + Send>>;
+
+    #[instrument(skip_all, level = Level::TRACE, name = "search_rpc")]
+    async fn search(
+        &self,
+        request: Request<Streaming<SearchRequest>>,
+    ) -> Result<Response<Self::SearchStream>, Status> {
+        let mut in_stream = request.into_inner();
+        let index = self.index.clone();
+
+        // Create output channel
+        let (tx, rx) = tokio::sync::mpsc::channel::<Result<SearchResponse, Status>>(128);
+
+        // Spawn task to handle incoming requests and send responses
+        tokio::spawn(async move {
+            while let Some(req) = in_stream.message().await.transpose() {
+                match req {
+                    Ok(search_req) => {
+                        let query = search_req.query;
+                        let query_id = search_req.query_id;
+                        let filter_mode: FilterMode = search_req
+                            .filter_mode
+                            .try_into()
+                            .unwrap_or(FilterMode::Global);
+                        let proto_context = search_req.context;
+
+                        debug!(
+                            "search request: query = {}, query_id = {}, filter_mode = {}, context = {:?}",
+                            query,
+                            query_id,
+                            filter_mode.as_str_name(),
+                            proto_context
+                        );
+
+                        // Convert proto FilterMode + context to IndexFilterMode
+                        let index_filter = convert_filter_mode(filter_mode, &proto_context);
+
+                        // Build QueryContext from proto context
+                        let query_context = proto_context
+                            .map(|ctx| QueryContext {
+                                cwd: Some(with_trailing_slash(&ctx.cwd)),
+                                git_root: ctx.git_root.map(|s| with_trailing_slash(&s)),
+                                hostname: Some(ctx.hostname),
+                                session_id: Some(ctx.session_id),
+                            })
+                            .unwrap_or_default();
+
+                        // Perform the search
+                        let history_ids =
+                            span!(Level::TRACE, "daemon_search_query", %query, query_id)
+                                .in_scope(|| async {
+                                    let index = index.read().await;
+                                    index
+                                        .search(&query, index_filter, &query_context, RESULTS_LIMIT)
+                                        .await
+                                })
+                                .await;
+
+                        // Convert history IDs to bytes
+                        let ids: Vec<Vec<u8>> = history_ids
+                            .iter()
+                            .filter_map(|id| {
+                                Uuid::parse_str(id)
+                                    .ok()
+                                    .map(|uuid| uuid.as_bytes().to_vec())
+                            })
+                            .collect();
+
+                        if tx.send(Ok(SearchResponse { query_id, ids })).await.is_err() {
+                            break; // Client disconnected
+                        }
+                    }
+                    Err(e) => {
+                        let _ = tx.send(Err(e)).await;
+                        break;
+                    }
+                }
+            }
+        });
+
+        // Convert receiver to stream
+        let out_stream = tokio_stream::wrappers::ReceiverStream::new(rx);
+        Ok(Response::new(Box::pin(out_stream)))
+    }
+}
+
+/// Convert proto FilterMode and context to IndexFilterMode.
+fn convert_filter_mode(
+    mode: FilterMode,
+    context: &Option<crate::search::SearchContext>,
+) -> IndexFilterMode {
+    match (mode, context) {
+        (FilterMode::Global, _) => IndexFilterMode::Global,
+        (FilterMode::Directory, Some(ctx)) => {
+            IndexFilterMode::Directory(with_trailing_slash(&ctx.cwd))
+        }
+        (FilterMode::Workspace, Some(ctx)) => {
+            if let Some(ref git_root) = ctx.git_root {
+                IndexFilterMode::Workspace(with_trailing_slash(git_root))
+            } else {
+                // Fall back to directory if no git root
+                IndexFilterMode::Directory(with_trailing_slash(&ctx.cwd))
+            }
+        }
+        (FilterMode::Host, Some(ctx)) => IndexFilterMode::Host(ctx.hostname.clone()),
+        (FilterMode::Session, Some(ctx)) => IndexFilterMode::Session(ctx.session_id.clone()),
+        (FilterMode::SessionPreload, Some(ctx)) => {
+            // SessionPreload is similar to Session - filter by session
+            IndexFilterMode::Session(ctx.session_id.clone())
+        }
+        // If no context provided, fall back to global
+        _ => IndexFilterMode::Global,
+    }
+}
+
+#[cfg(windows)]
+pub fn with_trailing_slash(s: &str) -> String {
+    if s.ends_with('\\') {
+        s.to_string()
+    } else {
+        format!("{}\\", s)
+    }
+}
+
+#[cfg(not(windows))]
+pub fn with_trailing_slash(s: &str) -> String {
+    if s.ends_with('/') {
+        s.to_string()
+    } else {
+        format!("{}/", s)
+    }
+}
diff --git a/crates/atuin-daemon/src/components/sync.rs b/crates/atuin-daemon/src/components/sync.rs
new file mode 100644
index 00000000..6217706a
--- /dev/null
+++ b/crates/atuin-daemon/src/components/sync.rs
@@ -0,0 +1,257 @@
+//! Sync component.
+//!
+//! Handles periodic synchronization with the Atuin cloud server.
+
+use eyre::Result;
+use rand::Rng;
+use tokio::sync::mpsc;
+use tokio::time::{self, MissedTickBehavior};
+
+use atuin_client::{history::store::HistoryStore, record::sync, settings::Settings};
+use atuin_dotfiles::store::{AliasStore, var::VarStore};
+
+use crate::{
+    daemon::{Component, DaemonHandle},
+    events::DaemonEvent,
+};
+
+/// Commands that can be sent to the sync task.
+enum SyncCommand {
+    /// Trigger an immediate sync.
+    ForceSync,
+    /// Stop the sync loop.
+    Stop,
+}
+
+/// Sync component - handles periodic cloud synchronization.
+///
+/// This component:
+/// - Runs a background sync loop on a configurable interval
+/// - Implements exponential backoff on sync failures
+/// - Responds to ForceSync events for immediate sync
+/// - Emits SyncCompleted/SyncFailed events
+pub struct SyncComponent {
+    task_handle: Option<tokio::task::JoinHandle<()>>,
+    command_tx: Option<mpsc::Sender<SyncCommand>>,
+}
+
+impl SyncComponent {
+    /// Create a new sync component.
+    pub fn new() -> Self {
+        Self {
+            task_handle: None,
+            command_tx: None,
+        }
+    }
+}
+
+impl Default for SyncComponent {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[tonic::async_trait]
+impl Component for SyncComponent {
+    fn name(&self) -> &'static str {
+        "sync"
+    }
+
+    async fn start(&mut self, handle: DaemonHandle) -> Result<()> {
+        let (cmd_tx, cmd_rx) = mpsc::channel(16);
+        self.command_tx = Some(cmd_tx);
+
+        // Spawn the sync loop with its own copy of the handle
+        self.task_handle = Some(tokio::spawn(sync_loop(handle, cmd_rx)));
+
+        tracing::info!("sync component started");
+        Ok(())
+    }
+
+    async fn handle_event(&mut self, event: &DaemonEvent) -> Result<()> {
+        if let DaemonEvent::ForceSync = event {
+            tracing::info!("force sync requested");
+            if let Some(tx) = &self.command_tx {
+                let _ = tx.send(SyncCommand::ForceSync).await;
+            }
+        }
+        Ok(())
+    }
+
+    async fn stop(&mut self) -> Result<()> {
+        if let Some(tx) = &self.command_tx {
+            let _ = tx.send(SyncCommand::Stop).await;
+        }
+        if let Some(handle) = self.task_handle.take() {
+            // Give the task a moment to shut down gracefully
+            let _ = tokio::time::timeout(std::time::Duration::from_secs(5), handle).await;
+        }
+        tracing::info!("sync component stopped");
+        Ok(())
+    }
+}
+
+/// The main sync loop.
+///
+/// This runs in a spawned task and handles periodic sync as well as
+/// force sync requests.
+async fn sync_loop(handle: DaemonHandle, mut cmd_rx: mpsc::Receiver<SyncCommand>) {
+    tracing::info!("sync loop starting");
+
+    // Clone settings since we need them across await points
+    let settings = handle.settings().await.clone();
+    let host_id = match Settings::host_id().await {
+        Ok(id) => id,
+        Err(e) => {
+            tracing::error!("failed to get host id, sync disabled: {e}");
+            return;
+        }
+    };
+
+    // Create the stores we need
+    let encryption_key = *handle.encryption_key();
+    let history_store = HistoryStore::new(handle.store().clone(), host_id, encryption_key);
+    let alias_store = AliasStore::new(handle.store().clone(), host_id, encryption_key);
+    let var_store = VarStore::new(handle.store().clone(), host_id, encryption_key);
+
+    // Don't backoff by more than 30 mins (with a random jitter of up to 1 min)
+    let max_interval: f64 = 60.0 * 30.0 + rand::thread_rng().gen_range(0.0..60.0);
+
+    let mut ticker = time::interval(time::Duration::from_secs(settings.daemon.sync_frequency));
+
+    // IMPORTANT: without this, if we miss ticks because a sync takes ages or is otherwise delayed,
+    // we may end up running a lot of syncs in a hot loop.
+    ticker.set_missed_tick_behavior(MissedTickBehavior::Skip);
+
+    loop {
+        tokio::select! {
+            _ = ticker.tick() => {
+                do_sync_tick(
+                    &handle,
+                    &history_store,
+                    &alias_store,
+                    &var_store,
+                    &mut ticker,
+                    max_interval,
+                ).await;
+            }
+            cmd = cmd_rx.recv() => {
+                match cmd {
+                    Some(SyncCommand::ForceSync) => {
+                        tracing::info!("executing force sync");
+                        do_sync_tick(
+                            &handle,
+                            &history_store,
+                            &alias_store,
+                            &var_store,
+                            &mut ticker,
+                            max_interval,
+                        ).await;
+                    }
+                    Some(SyncCommand::Stop) | None => {
+                        tracing::info!("sync loop stopping");
+                        break;
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// Execute a single sync tick.
+async fn do_sync_tick(
+    handle: &DaemonHandle,
+    history_store: &HistoryStore,
+    alias_store: &AliasStore,
+    var_store: &VarStore,
+    ticker: &mut time::Interval,
+    max_interval: f64,
+) {
+    // Clone settings since we need them across await points
+    let settings = handle.settings().await.clone();
+
+    tracing::info!("sync tick");
+
+    // Check if logged in
+    let logged_in = match settings.logged_in().await {
+        Ok(v) => v,
+        Err(e) => {
+            tracing::warn!("failed to check login status, skipping sync tick: {e}");
+            return;
+        }
+    };
+
+    if !logged_in {
+        tracing::debug!("not logged in, skipping sync tick");
+        return;
+    }
+
+    // Perform the sync
+    let res = sync::sync(&settings, handle.store()).await;
+
+    match res {
+        Err(e) => {
+            tracing::error!("sync tick failed with {e}");
+
+            // Emit failure event
+            handle.emit(DaemonEvent::SyncFailed {
+                error: e.to_string(),
+            });
+
+            // Exponential backoff
+            let mut rng = rand::thread_rng();
+            let mut new_interval = ticker.period().as_secs_f64() * rng.gen_range(2.0..2.2);
+
+            if new_interval > max_interval {
+                new_interval = max_interval;
+            }
+
+            *ticker = time::interval(time::Duration::from_secs(new_interval as u64));
+            ticker.reset_after(time::Duration::from_secs(new_interval as u64));
+
+            tracing::error!("backing off, next sync tick in {new_interval}");
+        }
+        Ok((uploaded_count, downloaded_records)) => {
+            tracing::info!(
+                uploaded = uploaded_count,
+                downloaded = downloaded_records.len(),
+                "sync complete"
+            );
+
+            // Build history from downloaded records
+            if let Err(e) = history_store
+                .incremental_build(handle.history_db(), &downloaded_records)
+                .await
+            {
+                tracing::error!("failed to build history from downloaded records: {e}");
+            }
+
+            // Emit the records added event (for search indexing)
+            handle.emit(DaemonEvent::RecordsAdded(downloaded_records.clone()));
+
+            // Emit sync completed event
+            handle.emit(DaemonEvent::SyncCompleted {
+                uploaded: uploaded_count as usize,
+                downloaded: downloaded_records.len(),
+            });
+
+            // Rebuild alias and var stores
+            if let Err(e) = alias_store.build().await {
+                tracing::error!("failed to rebuild alias store: {e}");
+            }
+            if let Err(e) = var_store.build().await {
+                tracing::error!("failed to rebuild var store: {e}");
+            }
+
+            // Reset backoff on success
+            if ticker.period().as_secs() != settings.daemon.sync_frequency {
+                *ticker = time::interval(time::Duration::from_secs(settings.daemon.sync_frequency));
+            }
+
+            // Store sync time
+            if let Err(e) = Settings::save_sync_time().await {
+                tracing::error!("failed to save sync time: {e}");
+            }
+        }
+    }
+}