3 files changed, 986 insertions, 31 deletions

diff --git a/src/sync/mod.rs b/src/sync/mod.rs
index 71f91e2..9dec982 100644
--- a/src/sync/mod.rs
+++ b/src/sync/mod.rs
@@ -37,17 +37,26 @@
 //! for the complete design context.
 
 use std::collections::{HashMap, HashSet};
+use std::net::SocketAddr;
 use std::sync::Arc;
 
-use nostr_relay_builder::prelude::{Event, Filter, Kind, TagKind};
+use nostr_relay_builder::prelude::{
+    DatabaseEventStatus, Event, Filter, Kind, PolicyResult, SaveEventStatus, TagKind, WritePolicy,
+};
+use nostr_sdk::prelude::*;
 use nostr_sdk::EventId;
-use tokio::sync::RwLock;
+use tokio::sync::{mpsc, RwLock};
 
 use crate::config::Config;
 use crate::nostr::builder::Nip34WritePolicy;
 use crate::nostr::events::{KIND_PR, KIND_PR_UPDATE, KIND_REPOSITORY_ANNOUNCEMENT};
 use crate::nostr::SharedDatabase;
 
+mod relay_connection;
+mod self_subscriber;
+pub use relay_connection::{RelayConnection, RelayEvent};
+pub use self_subscriber::{RelayAction, SelfSubscriber};
+
 // =============================================================================
 // Type Aliases for Sync State
 // =============================================================================
@@ -176,7 +185,7 @@ pub fn new_sync_relays() -> SyncRelays {
 /// The SyncManager is responsible for:
 /// - Discovering relays from stored repository announcements
 /// - Maintaining connections to sync relays
-/// - Subscribing to events at external relays  
+/// - Subscribing to events at external relays
 /// - Applying the acceptance policy to synced events
 ///
 /// ## Lifecycle
@@ -186,14 +195,16 @@ pub fn new_sync_relays() -> SyncRelays {
 ///
 /// ## Current Status
 ///
-/// This is a stub implementation. The core data structures are:
+/// Phase 2 implementation supports:
+/// - Layer 1 sync: Bootstrap relay connection with 30617/30618 filter
+/// - Event processing through write policy
+/// - Storage of accepted events
+///
+/// Core data structures:
 /// - [`FollowingRepoRootEvents`]: Repository root events we're following
 /// - [`SyncRelays`]: Relays we sync from with their repos and events
-///
-/// Full implementation will come in later phases.
 pub struct SyncManager {
     /// Bootstrap relay URL if configured
-    #[allow(dead_code)]
     bootstrap_relay_url: Option<String>,
 
     /// Our service domain for filtering repo announcements
@@ -201,11 +212,9 @@ pub struct SyncManager {
     service_domain: String,
 
     /// Database for querying/storing events
-    #[allow(dead_code)]
     database: SharedDatabase,
 
     /// Write policy for applying acceptance rules
-    #[allow(dead_code)]
     write_policy: Nip34WritePolicy,
 
     /// Repository root events we're following (Phase 1 data structure)
@@ -219,6 +228,9 @@ pub struct SyncManager {
     /// Max backoff duration for relay reconnection
     #[allow(dead_code)]
     max_backoff_secs: u64,
+
+    /// Socket address used for sync source (for write policy)
+    sync_source_addr: SocketAddr,
 }
 
 impl SyncManager {
@@ -238,6 +250,10 @@ impl SyncManager {
         write_policy: Nip34WritePolicy,
         config: &Config,
     ) -> Self {
+        // Create a synthetic SocketAddr for sync source identification
+        // This is used when calling write_policy.admit_event() for synced events
+        let sync_source_addr: SocketAddr = "0.0.0.0:0".parse().unwrap();
+
         Self {
             bootstrap_relay_url,
             service_domain,
@@ -246,6 +262,7 @@ impl SyncManager {
             following_repo_root_events: new_following_repo_root_events(),
             sync_relays: new_sync_relays(),
             max_backoff_secs: config.sync_max_backoff_secs,
+            sync_source_addr,
         }
     }
 
@@ -460,14 +477,12 @@ impl SyncManager {
     /// });
     /// ```
     ///
-    /// ## Current Status
+    /// ## Implementation Status
     ///
-    /// This is a stub that logs and then waits indefinitely.
-    /// Full implementation includes:
-    /// - Phase 2: Database initialization queries ✓
-    /// - Phase 3: Self-subscription for incremental updates
-    /// - Phase 4-6: Filter building, connection management
-    /// - Phase 7: Full sync loop
+    /// - Phase 2: Layer 1 sync from bootstrap relay ✓
+    /// - Phase 3: Self-subscription and relay discovery ✓
+    /// - Phase 4-6: Filter building, connection management (TODO)
+    /// - Phase 7: Full sync loop (TODO)
     pub async fn run(self) {
         tracing::info!(
             "SyncManager starting (bootstrap_relay={:?}, domain={})",
@@ -475,27 +490,285 @@ impl SyncManager {
             self.service_domain
         );
 
-        // Phase 2: Initialize from database
+        // Phase 3: Initialize state from database BEFORE spawning connections
         if let Err(e) = self.initialize_from_database().await {
-            tracing::error!("Failed to initialize sync state from database: {}", e);
-            // Continue anyway - we can still receive events via self-subscription
+            tracing::error!("Failed to initialize from database: {}", e);
+            // Continue anyway - we can still sync from bootstrap
         }
 
-        // Log initialization results
-        {
-            let following_count = self.following_repo_root_events.read().await.len();
-            let sync_relays_count = self.sync_relays.read().await.len();
-            tracing::info!(
-                "Sync state initialized: {} repos tracked, {} sync relays",
-                following_count,
-                sync_relays_count
-            );
+        // Create channel for relay actions from self-subscriber
+        let (action_tx, mut action_rx) = mpsc::channel::<RelayAction>(100);
+
+        // Construct our own relay URL for self-subscription
+        let own_relay_url = format!("ws://{}", self.service_domain);
+
+        // Spawn self-subscriber task
+        let self_subscriber = SelfSubscriber::new(
+            own_relay_url.clone(),
+            self.service_domain.clone(),
+            Arc::clone(&self.following_repo_root_events),
+            Arc::clone(&self.sync_relays),
+            action_tx,
+        );
+
+        tokio::spawn(async move {
+            self_subscriber.run().await;
+        });
+
+        tracing::info!("SelfSubscriber spawned for {}", own_relay_url);
+
+        // Track active relay connections (relay_url -> event_sender)
+        let mut active_relays: HashMap<String, mpsc::Sender<RelayEvent>> = HashMap::new();
+
+        // Phase 2: Connect to bootstrap relay if configured
+        if let Some(ref bootstrap_url) = self.bootstrap_relay_url {
+            if let Some(event_tx) = self
+                .spawn_relay_connection(bootstrap_url.clone(), None)
+                .await
+            {
+                active_relays.insert(bootstrap_url.clone(), event_tx);
+            }
         }
 
-        // Stub: wait indefinitely until full implementation (Phases 3-7)
-        // This prevents the spawned task from immediately completing
+        // Main coordination loop
         loop {
-            tokio::time::sleep(std::time::Duration::from_secs(3600)).await;
+            tokio::select! {
+                // Handle relay actions from self-subscriber
+                action = action_rx.recv() => {
+                    match action {
+                        Some(RelayAction::SpawnRelay { relay_url, repos_and_root_events }) => {
+                            tracing::info!("Spawning new relay connection to {}", relay_url);
+                            if !active_relays.contains_key(&relay_url) {
+                                if let Some(event_tx) = self.spawn_relay_connection(relay_url.clone(), Some(repos)).await {
+                                    active_relays.insert(relay_url, event_tx);
+                                }
+                            }
+                        }
+                        Some(RelayAction::AddFilters { relay_url, repos_and_new_root_event }) => {
+                            tracing::debug!("AddFilters for {} - {} repos (not yet implemented)", relay_url, repos.len());
+                            // TODO: Implement filter updates for existing connections
+                        }
+                        None => {
+                            tracing::info!("Action channel closed, continuing without self-subscriber");
+                        }
+                    }
+                }
+                // Sleep to prevent busy loop when no events
+                _ = tokio::time::sleep(std::time::Duration::from_secs(60)) => {
+                    // Periodic maintenance could go here
+                }
+            }
+        }
+    }
+
+    /// Spawn a relay connection with optional Layer 2 filters.
+    ///
+    /// Returns the event sender channel if successfully spawned.
+    async fn spawn_relay_connection(
+        &self,
+        relay_url: String,
+        repos: Option<HashMap<String, HashSet<EventId>>>,
+    ) -> Option<mpsc::Sender<RelayEvent>> {
+        // Create channel for receiving events
+        let (event_tx, event_rx) = mpsc::channel::<RelayEvent>(100);
+
+        // Create connection
+        let connection = RelayConnection::new(relay_url.clone());
+
+        // Determine if this is bootstrap (no repos) or discovered relay (with repos)
+        let is_bootstrap = repos.is_none();
+
+        match connection.connect_and_subscribe().await {
+            Ok(()) => {
+                if is_bootstrap {
+                    tracing::info!("Bootstrap relay connection established: {}", relay_url);
+                } else {
+                    tracing::info!(
+                        "Discovered relay connection established: {} (with Layer 2 filters)",
+                        relay_url
+                    );
+
+                    // Add Layer 2 subscription for repo events
+                    if let Some(ref repos) = repos {
+                        if let Err(e) = self.add_layer2_subscription(&connection, repos).await {
+                            tracing::warn!("Failed to add Layer 2 subscription: {}", e);
+                        }
+                    }
+                }
+
+                // Clone refs needed for event processing task
+                let database = Arc::clone(&self.database);
+                let write_policy = self.write_policy.clone();
+                let sync_source_addr = self.sync_source_addr;
+
+                // Clone event_tx for the spawned task
+                let event_tx_clone = event_tx.clone();
+
+                // Spawn event loop task
+                let conn_url = relay_url.clone();
+                tokio::spawn(async move {
+                    connection.run_event_loop(event_tx_clone).await;
+                });
+
+                // Spawn event processing task
+                tokio::spawn(async move {
+                    Self::process_relay_events(
+                        event_rx,
+                        database,
+                        write_policy,
+                        sync_source_addr,
+                        conn_url,
+                    )
+                    .await;
+                });
+
+                Some(event_tx)
+            }
+            Err(e) => {
+                tracing::error!("Failed to connect to relay {}: {}", relay_url, e);
+                None
+            }
+        }
+    }
+
+    /// Add Layer 2 subscription for repo-related events.
+    ///
+    /// Layer 2 filters subscribe to events with 'a' tags referencing repos we track.
+    async fn add_layer2_subscription(
+        &self,
+        connection: &RelayConnection,
+        repos: &HashMap<String, HashSet<EventId>>,
+    ) -> Result<(), String> {
+        if repos.is_empty() {
+            return Ok(());
+        }
+
+        // Build repo refs list for filter
+        let repo_refs: Vec<String> = repos.keys().cloned().collect();
+
+        tracing::debug!(
+            "Adding Layer 2 subscription for {} repos to {}",
+            repo_refs.len(),
+            connection.url()
+        );
+
+        // Chunk repo_refs into groups of 100 (per plan)
+        for chunk in repo_refs.chunks(100) {
+            // Build filter with lowercase 'a' tag for each repo ref
+            let mut filter = Filter::new().kinds([
+                Kind::GitPatch,     // 1617
+                Kind::Custom(1618), // PR
+                Kind::Custom(1619), // PR update
+                Kind::GitIssue,     // 1621
+            ]);
+
+            // Add each repo ref as a custom tag filter
+            for repo_ref in chunk {
+                filter =
+                    filter.custom_tag(SingleLetterTag::lowercase(Alphabet::A), repo_ref.clone());
+            }
+
+            // Subscribe to this filter
+            if let Err(e) = connection.subscribe_filter(filter).await {
+                return Err(format!("Failed to subscribe with Layer 2 filter: {}", e));
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Process events from a single relay connection.
+    ///
+    /// This is a static method that runs in its own task.
+    async fn process_relay_events(
+        mut event_rx: mpsc::Receiver<RelayEvent>,
+        database: SharedDatabase,
+        write_policy: Nip34WritePolicy,
+        sync_source_addr: SocketAddr,
+        relay_url: String,
+    ) {
+        tracing::debug!("Starting event processing for relay: {}", relay_url);
+
+        while let Some(relay_event) = event_rx.recv().await {
+            match relay_event {
+                RelayEvent::Event(event) => {
+                    Self::process_single_event_static(
+                        &event,
+                        &database,
+                        &write_policy,
+                        &sync_source_addr,
+                        &relay_url,
+                    )
+                    .await;
+                }
+                RelayEvent::EndOfStoredEvents => {
+                    tracing::debug!("EOSE received from {}", relay_url);
+                }
+                RelayEvent::Closed(reason) => {
+                    tracing::warn!("Connection to {} closed: {}", relay_url, reason);
+                    break;
+                }
+            }
+        }
+
+        tracing::info!("Event processing ended for relay: {}", relay_url);
+    }
+
+    /// Process a single event (static version for use in spawned tasks).
+    async fn process_single_event_static(
+        event: &Event,
+        database: &SharedDatabase,
+        write_policy: &Nip34WritePolicy,
+        sync_source_addr: &SocketAddr,
+        relay_url: &str,
+    ) {
+        let event_id = event.id;
+        let kind = event.kind.as_u16();
+
+        // Check if event already exists in database
+        match database.check_id(&event_id).await {
+            Ok(DatabaseEventStatus::Saved) | Ok(DatabaseEventStatus::Deleted) => {
+                tracing::trace!("Event {} already exists, skipping", event_id);
+                return;
+            }
+            Ok(DatabaseEventStatus::NotExistent) => {} // Continue processing
+            Err(e) => {
+                tracing::warn!("Failed to check if event {} exists: {}", event_id, e);
+            }
+        }
+
+        // Pass through write policy
+        let policy_result = write_policy.admit_event(event, sync_source_addr).await;
+
+        match policy_result {
+            PolicyResult::Accept => match database.save_event(event).await {
+                Ok(SaveEventStatus::Success) => {
+                    tracing::info!(
+                        "Synced event {} (kind {}) from {}",
+                        event_id,
+                        kind,
+                        relay_url
+                    );
+                }
+                Ok(_) => {
+                    tracing::debug!(
+                        "Event {} (kind {}) already stored or rejected by database",
+                        event_id,
+                        kind
+                    );
+                }
+                Err(e) => {
+                    tracing::error!("Failed to save synced event {}: {}", event_id, e);
+                }
+            },
+            PolicyResult::Reject(reason) => {
+                tracing::debug!(
+                    "Rejected synced event {} (kind {}): {}",
+                    event_id,
+                    kind,
+                    reason
+                );
+            }
         }
     }
 }
diff --git a/src/sync/relay_connection.rs b/src/sync/relay_connection.rs
new file mode 100644
index 0000000..71b5d51
--- /dev/null
+++ b/src/sync/relay_connection.rs
@@ -0,0 +1,185 @@
+//! Relay Connection for Proactive Sync
+//!
+//! This module handles connecting to external relays and receiving events
+//! for the proactive sync system.
+
+use std::time::Duration;
+
+use nostr_sdk::prelude::*;
+use tokio::sync::mpsc;
+
+use crate::nostr::events::{KIND_REPOSITORY_ANNOUNCEMENT, KIND_REPOSITORY_STATE};
+
+/// Events received from a relay connection
+#[derive(Debug)]
+pub enum RelayEvent {
+    /// A nostr event was received
+    Event(Event),
+    /// End of stored events (EOSE) received
+    EndOfStoredEvents,
+    /// Connection was closed
+    Closed(String),
+}
+
+/// Connection to an external relay for syncing events.
+///
+/// RelayConnection handles:
+/// - Connecting to the relay
+/// - Subscribing with appropriate filters (Layer 1 for bootstrap)
+/// - Receiving events and sending them through a channel
+pub struct RelayConnection {
+    /// The relay URL
+    url: String,
+    /// The nostr-sdk client
+    client: Client,
+}
+
+impl RelayConnection {
+    /// Create a new relay connection.
+    ///
+    /// # Arguments
+    ///
+    /// * `url` - The WebSocket URL of the relay to connect to
+    pub fn new(url: String) -> Self {
+        // Create a client with generated keys (we're just subscribing, not publishing)
+        let keys = Keys::generate();
+        let client = Client::new(keys);
+
+        Self { url, client }
+    }
+
+    /// Connect to the relay and subscribe with Layer 1 filter.
+    ///
+    /// Layer 1 filter syncs announcement events (30617, 30618) which are
+    /// the foundation for discovering repository relationships.
+    ///
+    /// Returns the notification stream for receiving events.
+    pub async fn connect_and_subscribe(&self) -> Result<(), String> {
+        // Add the relay
+        self.client
+            .add_relay(&self.url)
+            .await
+            .map_err(|e| format!("Failed to add relay {}: {}", self.url, e))?;
+
+        // Connect to relay
+        self.client.connect().await;
+
+        // Wait for connection to establish
+        let mut connected = false;
+        for _ in 0..30 {
+            tokio::time::sleep(Duration::from_millis(100)).await;
+            let relays = self.client.relays().await;
+            if relays.values().any(|r| r.is_connected()) {
+                connected = true;
+                break;
+            }
+        }
+
+        if !connected {
+            return Err(format!(
+                "Failed to connect to relay {} after 3 seconds",
+                self.url
+            ));
+        }
+
+        tracing::info!("Connected to bootstrap relay: {}", self.url);
+
+        // Layer 1 filter: Repository announcements and state events
+        // These are addressable events that define repositories
+        let filter = Filter::new().kinds([
+            Kind::Custom(KIND_REPOSITORY_ANNOUNCEMENT), // 30617
+            Kind::Custom(KIND_REPOSITORY_STATE),        // 30618
+        ]);
+
+        // Subscribe to the filter
+        self.client
+            .subscribe(filter, None)
+            .await
+            .map_err(|e| format!("Failed to subscribe: {}", e))?;
+
+        tracing::debug!(
+            "Subscribed to Layer 1 events (kinds 30617, 30618) from {}",
+            self.url
+        );
+
+        Ok(())
+    }
+
+    /// Run the event loop, sending received events through the channel.
+    ///
+    /// This method runs until the connection is closed or an error occurs.
+    ///
+    /// # Arguments
+    ///
+    /// * `event_sender` - Channel to send received events
+    pub async fn run_event_loop(self, event_sender: mpsc::Sender<RelayEvent>) {
+        tracing::debug!("Starting event loop for relay: {}", self.url);
+
+        // Handle notifications
+        self.client
+            .handle_notifications(|notification| async {
+                match notification {
+                    RelayPoolNotification::Event { event, .. } => {
+                        tracing::debug!(
+                            "Received event {} (kind {}) from {}",
+                            event.id,
+                            event.kind.as_u16(),
+                            self.url
+                        );
+                        if event_sender.send(RelayEvent::Event(*event)).await.is_err() {
+                            tracing::warn!("Event channel closed, stopping relay connection");
+                            return Ok(true); // Stop handling
+                        }
+                    }
+                    RelayPoolNotification::Message { message, .. } => {
+                        if let RelayMessage::EndOfStoredEvents(_) = message {
+                            tracing::debug!("EOSE received from {}", self.url);
+                            if event_sender
+                                .send(RelayEvent::EndOfStoredEvents)
+                                .await
+                                .is_err()
+                            {
+                                return Ok(true); // Stop handling
+                            }
+                        }
+                    }
+                    RelayPoolNotification::Shutdown => {
+                        tracing::info!("Relay {} shutting down", self.url);
+                        let _ = event_sender
+                            .send(RelayEvent::Closed("Shutdown".to_string()))
+                            .await;
+                        return Ok(true); // Stop handling
+                    }
+                }
+                Ok(false) // Continue handling
+            })
+            .await
+            .ok(); // Ignore errors on shutdown
+
+        // Disconnect when done
+        self.client.disconnect().await;
+        tracing::info!("Disconnected from relay: {}", self.url);
+    }
+
+    /// Get the relay URL
+    pub fn url(&self) -> &str {
+        &self.url
+    }
+
+    /// Subscribe to an additional filter.
+    ///
+    /// This is used to add Layer 2 filters for repo-related events after
+    /// the initial connection is established.
+    pub async fn subscribe_filter(&self, filter: Filter) -> Result<(), String> {
+        self.client
+            .subscribe(filter, None)
+            .await
+            .map_err(|e| format!("Failed to subscribe with filter: {}", e))?;
+        Ok(())
+    }
+
+    /// Get a reference to the client for additional operations.
+    pub fn client(&self) -> &Client {
+        &self.client
+    }
+}
diff --git a/src/sync/self_subscriber.rs b/src/sync/self_subscriber.rs
new file mode 100644
index 0000000..0512088
--- /dev/null
+++ b/src/sync/self_subscriber.rs
@@ -0,0 +1,497 @@
+//! Self-Subscriber for Proactive Sync
+//!
+//! This module handles subscribing to our own relay to detect new events
+//! and trigger relay discovery from announcements.
+
+use std::collections::{HashMap, HashSet};
+use std::time::Duration;
+
+use nostr_sdk::prelude::*;
+use tokio::sync::mpsc;
+use tokio::time::Instant;
+
+use crate::nostr::events::{KIND_PR, KIND_PR_UPDATE, KIND_REPOSITORY_ANNOUNCEMENT};
+
+use super::{FollowingRepoRootEvents, SyncManager, SyncRelays};
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/// Actions to be taken by the SyncManager based on self-subscription events.
+#[derive(Debug, Clone)]
+pub enum RelayAction {
+    /// Spawn a new relay connection to sync from.
+    /// Contains: relay_url, map of repo_refs to their event IDs for Layer 2 filtering.
+    SpawnRelay {
+        relay_url: String,
+        repos_and_root_events: HashMap<String, HashSet<EventId>>,
+    },
+    /// Add filters to an existing relay connection.
+    /// Contains: relay_url, additional repos to add.
+    AddFilters {
+        relay_url: String,
+        repos_and_new_root_event: HashMap<String, HashSet<EventId>>,
+    },
+}
+
+/// Pending updates collected during batch window.
+#[derive(Debug, Default)]
+struct PendingUpdates {
+    /// New announcements (kind 30617) - triggers relay discovery
+    announcements: Vec<Event>,
+    /// New root events (kinds 1617, 1618, 1619, 1621) - updates following set
+    root_events: Vec<Event>,
+}
+
+// =============================================================================
+// SelfSubscriber
+// =============================================================================
+
+/// Subscribes to our own relay to detect new events.
+///
+/// The self-subscriber:
+/// 1. Connects to our own relay
+/// 2. Subscribes to kinds 30617, 1617, 1618, 1619, 1621 (NOT 30618)
+/// 3. When events arrive, batches them
+/// 4. On batch timer fire, processes updates and sends relay actions
+pub struct SelfSubscriber {
+    /// URL of our own relay to subscribe to
+    own_relay_url: String,
+    /// Our relay domain for checking if announcements list us
+    relay_domain: String,
+    /// Reference to following repo root events (shared with SyncManager)
+    following_repo_root_events: FollowingRepoRootEvents,
+    /// Reference to sync relays (shared with SyncManager)
+    sync_relays: SyncRelays,
+    /// Channel to send relay actions back to manager
+    action_tx: mpsc::Sender<RelayAction>,
+}
+
+impl SelfSubscriber {
+    /// Create a new self-subscriber.
+    pub fn new(
+        own_relay_url: String,
+        relay_domain: String,
+        following_repo_root_events: FollowingRepoRootEvents,
+        sync_relays: SyncRelays,
+        action_tx: mpsc::Sender<RelayAction>,
+    ) -> Self {
+        Self {
+            own_relay_url,
+            relay_domain,
+            following_repo_root_events,
+            sync_relays,
+            action_tx,
+        }
+    }
+
+    /// Get the batch window duration from environment variable.
+    ///
+    /// Default is 5 seconds, but can be overridden via NGIT_SYNC_BATCH_WINDOW_MS
+    /// for faster tests (typically 200ms).
+    fn get_batch_window() -> Duration {
+        std::env::var("NGIT_SYNC_BATCH_WINDOW_MS")
+            .ok()
+            .and_then(|s| s.parse().ok())
+            .map(Duration::from_millis)
+            .unwrap_or(Duration::from_secs(5))
+    }
+
+    /// Run the self-subscriber event loop.
+    ///
+    /// This method:
+    /// 1. Connects to our own relay
+    /// 2. Subscribes to relevant event kinds
+    /// 3. Receives events and batches them
+    /// 4. On batch timer fire, processes and sends relay actions
+    pub async fn run(self) {
+        tracing::info!("SelfSubscriber starting for {}", self.own_relay_url);
+
+        // Create nostr-sdk client
+        let keys = Keys::generate();
+        let client = Client::new(keys);
+
+        // Connect to our own relay
+        if let Err(e) = client.add_relay(&self.own_relay_url).await {
+            tracing::error!("Failed to add own relay {}: {}", self.own_relay_url, e);
+            return;
+        }
+
+        client.connect().await;
+
+        // Wait for connection
+        let mut connected = false;
+        for _ in 0..30 {
+            tokio::time::sleep(Duration::from_millis(100)).await;
+            let relays = client.relays().await;
+            if relays.values().any(|r| r.is_connected()) {
+                connected = true;
+                break;
+            }
+        }
+
+        if !connected {
+            tracing::error!(
+                "Failed to connect to own relay {} after 3 seconds",
+                self.own_relay_url
+            );
+            return;
+        }
+
+        tracing::info!("SelfSubscriber connected to {}", self.own_relay_url);
+
+        // Subscribe to kinds 30617, 1617, 1618, 1619, 1621 (NOT 30618 per v2 design)
+        let filter = Filter::new()
+            .kinds([
+                Kind::Custom(KIND_REPOSITORY_ANNOUNCEMENT), // 30617
+                Kind::GitPatch,                             // 1617
+                Kind::Custom(KIND_PR),                      // 1618
+                Kind::Custom(KIND_PR_UPDATE),               // 1619
+                Kind::GitIssue,                             // 1621
+            ])
+            .since(Timestamp::now());
+
+        if let Err(e) = client.subscribe(filter, None).await {
+            tracing::error!("Failed to subscribe to own relay: {}", e);
+            return;
+        }
+
+        tracing::info!("SelfSubscriber subscribed to event kinds on own relay");
+
+        // Batch state
+        let mut pending = PendingUpdates::default();
+        let mut batch_timer_started: Option<Instant> = None;
+        let batch_window = Self::get_batch_window();
+
+        // Main event loop using notifications stream
+        loop {
+            // Calculate timeout for batch processing
+            let timeout = if let Some(started) = batch_timer_started {
+                let elapsed = started.elapsed();
+                if elapsed >= batch_window {
+                    Duration::ZERO
+                } else {
+                    batch_window - elapsed
+                }
+            } else {
+                Duration::from_secs(60) // Long timeout when no batch pending
+            };
+
+            // Wait for notification with timeout
+            let notification = tokio::time::timeout(timeout, client.notifications().recv()).await;
+
+            match notification {
+                Ok(Ok(notification)) => {
+                    match notification {
+                        RelayPoolNotification::Event { event, .. } => {
+                            let kind = event.kind.as_u16();
+
+                            // Start batch timer on first event (does NOT reset)
+                            if batch_timer_started.is_none() {
+                                batch_timer_started = Some(Instant::now());
+                                tracing::debug!("Batch timer started");
+                            }
+
+                            // Classify and add to pending
+                            if kind == KIND_REPOSITORY_ANNOUNCEMENT {
+                                tracing::debug!(
+                                    "SelfSubscriber received announcement {}",
+                                    event.id
+                                );
+                                pending.announcements.push(*event);
+                            } else {
+                                tracing::debug!(
+                                    "SelfSubscriber received root event {} (kind {})",
+                                    event.id,
+                                    kind
+                                );
+                                pending.root_events.push(*event);
+                            }
+                        }
+                        RelayPoolNotification::Message { message, .. } => {
+                            if let RelayMessage::EndOfStoredEvents(_) = message {
+                                tracing::debug!("SelfSubscriber EOSE received");
+                                // Process any pending events after EOSE
+                                if !pending.announcements.is_empty()
+                                    || !pending.root_events.is_empty()
+                                {
+                                    self.process_batch(&mut pending).await;
+                                    batch_timer_started = None;
+                                }
+                            }
+                        }
+                        RelayPoolNotification::Shutdown => {
+                            tracing::info!("SelfSubscriber shutting down");
+                            break;
+                        }
+                    }
+                }
+                Ok(Err(_)) => {
+                    // Channel closed
+                    tracing::warn!("SelfSubscriber notification channel closed");
+                    break;
+                }
+                Err(_) => {
+                    // Timeout - check if batch should be processed
+                    if let Some(started) = batch_timer_started {
+                        if started.elapsed() >= batch_window {
+                            if !pending.announcements.is_empty() || !pending.root_events.is_empty()
+                            {
+                                self.process_batch(&mut pending).await;
+                            }
+                            batch_timer_started = None;
+                        }
+                    }
+                }
+            }
+        }
+
+        client.disconnect().await;
+        tracing::info!("SelfSubscriber disconnected");
+    }
+
+    /// Process a batch of pending updates.
+    async fn process_batch(&self, pending: &mut PendingUpdates) {
+        tracing::debug!(
+            "Processing batch: {} announcements, {} root events",
+            pending.announcements.len(),
+            pending.root_events.len()
+        );
+
+        // Process root events first (update following_repo_root_events)
+        for event in pending.root_events.drain(..) {
+            let repo_refs = SyncManager::extract_all_repo_refs(&event);
+            if !repo_refs.is_empty() {
+                let mut guard = self.following_repo_root_events.write().await;
+                for repo_ref in repo_refs {
+                    guard.entry(repo_ref).or_default().insert(event.id);
+                }
+            }
+        }
+
+        // Process announcements (relay discovery)
+        for event in pending.announcements.drain(..) {
+            self.process_announcement(&event).await;
+        }
+    }
+
+    /// Process an announcement event for relay discovery.
+    async fn process_announcement(&self, event: &Event) {
+        let repo_ref = SyncManager::build_repo_ref(event);
+        let relay_urls = Self::extract_relay_urls_from_announcement(event);
+
+        // Check if this announcement lists our relay
+        if !self.lists_our_service(event) {
+            tracing::debug!(
+                "Announcement {} does not list our service, skipping relay discovery",
+                event.id
+            );
+            return;
+        }
+
+        tracing::info!(
+            "Processing announcement {} for repo {}, found {} relay URLs",
+            event.id,
+            repo_ref,
+            relay_urls.len()
+        );
+
+        // Get current events for this repo from following_repo_root_events
+        let events = self
+            .following_repo_root_events
+            .read()
+            .await
+            .get(&repo_ref)
+            .cloned()
+            .unwrap_or_default();
+
+        // For each relay URL in the announcement, check if we need to spawn or update
+        for relay_url in relay_urls {
+            if self.is_own_relay(&relay_url) {
+                continue; // Skip our own relay
+            }
+
+            let sync_relays_guard = self.sync_relays.read().await;
+            let exists = sync_relays_guard.contains_key(&relay_url);
+            drop(sync_relays_guard);
+
+            if exists {
+                // Relay already known - check if we need to add this repo
+                let mut guard = self.sync_relays.write().await;
+                let relay_repos = guard.entry(relay_url.clone()).or_default();
+                let is_new_repo = !relay_repos.contains_key(&repo_ref);
+
+                if is_new_repo {
+                    relay_repos.insert(repo_ref.clone(), events.clone());
+                    drop(guard);
+
+                    // Send action to add filters
+                    let mut repos_filters = HashMap::new();
+                    repos_filters.insert(repo_ref.clone(), events.clone());
+
+                    if let Err(e) = self
+                        .action_tx
+                        .send(RelayAction::AddFilters {
+                            relay_url: relay_url.clone(),
+                            repos_and_new_root_event: repos_filters,
+                        })
+                        .await
+                    {
+                        tracing::warn!("Failed to send AddFilters action: {}", e);
+                    }
+                }
+            } else {
+                // New relay - add to sync_relays and spawn
+                let mut guard = self.sync_relays.write().await;
+                let mut repos = HashMap::new();
+                repos.insert(repo_ref.clone(), events.clone());
+                guard.insert(relay_url.clone(), repos.clone());
+                drop(guard);
+
+                tracing::info!("Discovered new relay to sync from: {}", relay_url);
+
+                // Send action to spawn relay
+                if let Err(e) = self
+                    .action_tx
+                    .send(RelayAction::SpawnRelay {
+                        relay_url: relay_url.clone(),
+                        repos_and_root_events: repos,
+                    })
+                    .await
+                {
+                    tracing::warn!("Failed to send SpawnRelay action: {}", e);
+                }
+            }
+        }
+    }
+
+    /// Extract relay URLs from an announcement event.
+    ///
+    /// Looks for both 'relays' and 'clone' tags.
+    fn extract_relay_urls_from_announcement(event: &Event) -> Vec<String> {
+        let mut urls = Vec::new();
+
+        // Extract from 'relays' tag
+        for tag in event.tags.iter() {
+            if matches!(tag.kind(), TagKind::Relays) {
+                let vec = tag.clone().to_vec();
+                urls.extend(vec.into_iter().skip(1)); // Skip tag name
+            }
+        }
+
+        // Extract from 'clone' tag - parse URLs to get relay hints
+        // Clone URLs look like: http://domain/repo.git or git://domain/repo.git
+        // We want to construct ws://domain from these
+        for tag in event.tags.iter() {
+            if matches!(tag.kind(), TagKind::Clone) {
+                let vec = tag.clone().to_vec();
+                for url in vec.into_iter().skip(1) {
+                    if let Some(relay_url) = Self::clone_url_to_relay_url(&url) {
+                        if !urls.contains(&relay_url) {
+                            urls.push(relay_url);
+                        }
+                    }
+                }
+            }
+        }
+
+        urls
+    }
+
+    /// Convert a clone URL to a potential relay URL.
+    ///
+    /// E.g., "http://127.0.0.1:8080/repo.git" -> "ws://127.0.0.1:8080"
+    fn clone_url_to_relay_url(clone_url: &str) -> Option<String> {
+        // Parse the URL to extract host:port
+        if let Ok(url) = url::Url::parse(clone_url) {
+            let host = url.host_str()?;
+            let port = url.port();
+            let scheme = if url.scheme() == "https" { "wss" } else { "ws" };
+
+            if let Some(port) = port {
+                Some(format!("{}://{}:{}", scheme, host, port))
+            } else {
+                Some(format!("{}://{}", scheme, host))
+            }
+        } else {
+            None
+        }
+    }
+
+    /// Check if event lists our service in the relays or clone tags.
+    fn lists_our_service(&self, event: &Event) -> bool {
+        // Check relays tag
+        for tag in event.tags.iter() {
+            if matches!(tag.kind(), TagKind::Relays) {
+                let vec = tag.clone().to_vec();
+                for url in vec.into_iter().skip(1) {
+                    if self.is_own_relay(&url) {
+                        return true;
+                    }
+                }
+            }
+        }
+
+        // Check clone tag
+        for tag in event.tags.iter() {
+            if matches!(tag.kind(), TagKind::Clone) {
+                let vec = tag.clone().to_vec();
+                for url in vec.into_iter().skip(1) {
+                    if url.contains(&self.relay_domain) {
+                        return true;
+                    }
+                }
+            }
+        }
+
+        false
+    }
+
+    /// Check if a relay URL matches our relay.
+    fn is_own_relay(&self, relay_url: &str) -> bool {
+        relay_url.contains(&self.relay_domain)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_clone_url_to_relay_url_http() {
+        let url = "http://127.0.0.1:8080/repo.git";
+        let relay = SelfSubscriber::clone_url_to_relay_url(url);
+        assert_eq!(relay, Some("ws://127.0.0.1:8080".to_string()));
+    }
+
+    #[test]
+    fn test_clone_url_to_relay_url_https() {
+        let url = "https://example.com/repo.git";
+        let relay = SelfSubscriber::clone_url_to_relay_url(url);
+        assert_eq!(relay, Some("wss://example.com".to_string()));
+    }
+
+    #[test]
+    fn test_clone_url_to_relay_url_invalid() {
+        let url = "not-a-valid-url";
+        let relay = SelfSubscriber::clone_url_to_relay_url(url);
+        assert_eq!(relay, None);
+    }
+
+    #[test]
+    fn test_get_batch_window_default() {
+        // Clear env var if set
+        std::env::remove_var("NGIT_SYNC_BATCH_WINDOW_MS");
+        let window = SelfSubscriber::get_batch_window();
+        assert_eq!(window, Duration::from_secs(5));
+    }
+
+    #[test]
+    fn test_get_batch_window_from_env() {
+        std::env::set_var("NGIT_SYNC_BATCH_WINDOW_MS", "200");
+        let window = SelfSubscriber::get_batch_window();
+        assert_eq!(window, Duration::from_millis(200));
+        std::env::remove_var("NGIT_SYNC_BATCH_WINDOW_MS");
+    }
+}