From 2bc95d7652ea7a8a53424fa9fffe3579c9fdff5b Mon Sep 17 00:00:00 2001 From: DanConwayDev Date: Wed, 10 Dec 2025 09:07:54 +0000 Subject: improve sync design --- docs/explanation/grasp-02-proactive-sync-v3.md | 871 +++++++++++++++++++++++++ 1 file changed, 871 insertions(+) create mode 100644 docs/explanation/grasp-02-proactive-sync-v3.md (limited to 'docs/explanation/grasp-02-proactive-sync-v3.md') diff --git a/docs/explanation/grasp-02-proactive-sync-v3.md b/docs/explanation/grasp-02-proactive-sync-v3.md new file mode 100644 index 0000000..30b3102 --- /dev/null +++ b/docs/explanation/grasp-02-proactive-sync-v3.md @@ -0,0 +1,871 @@ +# GRASP-02: Proactive Sync v3 - Event-Driven Design + +## Overview + +This document presents v3 of the proactive sync design. Key principles: + +1. **Self-subscription as the only mechanism** - No database initialization at startup +2. **Batch-based pending tracking** - Each batch confirms independently +3. **Single action type** - AddFilters only, auto-spawn connections +4. **Three-way state model** - RepoSyncIndex (want) → PendingSyncIndex (in-flight) → RelaySyncIndex (confirmed) + +--- + +## Data Model + +### RepoSyncIndex (Source of Truth) + +```rust +/// What we WANT to sync - derived from events received via self-subscription. +/// Updated immediately when self-subscriber batch fires. +/// Key: repo addressable ref ("30617:pubkey:identifier") +pub type RepoSyncIndex = Arc>>; + +#[derive(Debug, Clone, Default)] +pub struct RepoSyncNeeds { + /// Relay URLs listed in this repo's 30617 announcement + pub relays: HashSet, + /// Root event IDs (1617/1618/1619/1621) that reference this repo + pub root_events: HashSet, +} +``` + +### RelaySyncIndex (Confirmed State + Connection) + +```rust +/// What we've CONFIRMED syncing - includes connection state for integrated lifecycle. +/// Key: relay URL +pub type RelaySyncIndex = Arc>>; + +/// Connection status for a relay +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +pub enum ConnectionStatus { + /// Not currently connected + Disconnected, + /// Connection attempt in progress + Connecting, + /// Successfully connected and subscribed + Connected, +} + +/// Complete state for a single relay - combines sync needs with connection lifecycle +#[derive(Debug)] +pub struct RelayState { + /// Repos we've confirmed syncing from this relay + pub repos: HashSet, + /// Root events we've confirmed tracking + pub root_events: HashSet, + /// If true, never disconnect this relay + pub is_bootstrap: bool, + /// Current connection status + pub connection_status: ConnectionStatus, + /// When we last successfully connected (for since filter on reconnect) + pub last_connected: Option, + /// When we disconnected (for 15-minute state retention rule) + pub disconnected_at: Option, + /// The active connection (None if disconnected) + pub connection: Option, +} + +impl RelayState { + /// Check if state should be cleared based on 15-minute rule + pub fn should_clear_state(&self) -> bool { + match self.disconnected_at { + Some(disconnected) => { + let now = Timestamp::now(); + now.as_u64().saturating_sub(disconnected.as_u64()) > 900 // 15 minutes + } + None => false, // Still connected or never connected + } + } + + /// Clear repos and root_events (called when reconnect takes > 15 minutes) + pub fn clear_sync_state(&mut self) { + self.repos.clear(); + self.root_events.clear(); + } +} +``` + +### PendingSyncIndex (In-Flight Batches) + +```rust +/// Tracks batches of subscriptions that are in-flight, awaiting EOSE. +/// Each batch has its own ID and can confirm independently. +/// Key: relay URL +pub type PendingSyncIndex = Arc>>>; + +#[derive(Debug, Clone)] +pub struct PendingBatch { + /// Unique ID for this batch (for debugging/logging) + pub batch_id: u64, + /// The items this batch is syncing + pub items: PendingItems, + /// Subscription IDs that must ALL receive EOSE before confirming + pub outstanding_subs: HashSet, +} + +#[derive(Debug, Clone, Default)] +pub struct PendingItems { + pub repos: HashSet, + pub root_events: HashSet, +} +``` + +--- + +## State Flow + +```mermaid +flowchart TB + subgraph Input + SS[SelfSubscriber] + OWN[Own Relay] + end + + subgraph RepoSyncIndex - Want + RSI[HashMap of Repo to Relays+Events] + end + + subgraph Derived Target + DT[derive_relay_targets fn] + TGT[Per-relay: repos + events we should sync] + end + + subgraph PendingSyncIndex - In Flight + PSI[Vec of PendingBatch per relay] + end + + subgraph RelaySyncIndex - State + Connection + RLI[RelayState per relay] + CONN[connection: Option of RelayConnection] + STATUS[connection_status: Connected/Disconnected/Connecting] + REPOS[repos + root_events] + end + + SS -->|subscribe| OWN + OWN -->|events| SS + SS -->|batch fires| RSI + RSI --> DT + DT --> TGT + TGT -->|diff: target - pending - confirmed| DIFF[Compute new items] + PSI --> DIFF + RLI --> DIFF + DIFF -->|skip if disconnected| CHECK{Connected?} + CHECK -->|yes| AF[AddFilters] + CHECK -->|no| QUEUE[Queued in RelayState.repos] + AF -->|subscribe| CONN + AF -->|create batch| PSI + CONN -->|EOSE| PSI + PSI -->|batch complete| REPOS + CONN -->|disconnect event| DISC[Mark Disconnected + set disconnected_at] + DISC -->|reconnect| RECONN[On Reconnect] + RECONN -->|check 15min rule| RULE{disconnected > 15min?} + RULE -->|yes| CLEAR[Clear repos/root_events] + RULE -->|no| RETAIN[Keep retained state] + CLEAR --> REGEN[Regenerate AddFilters from RepoSyncIndex] + RETAIN --> RESUB[Resubscribe with since filter] +``` + +### Connection Lifecycle Integration + +The `RelayState` struct now owns both the connection and sync state: + +```rust +// On disconnect (detected via RelayPoolNotification::Shutdown or handle_notifications returning) +fn handle_disconnect(&mut self, relay_url: &str) { + if let Some(state) = self.relay_sync_index.write().await.get_mut(relay_url) { + state.connection_status = ConnectionStatus::Disconnected; + state.disconnected_at = Some(Timestamp::now()); + state.connection = None; + + // Clear any pending batches for this relay + self.pending_sync_index.write().await.remove(relay_url); + } +} + +// On reconnect +async fn handle_reconnect(&mut self, relay_url: &str) -> Result<(), Error> { + let mut index = self.relay_sync_index.write().await; + let state = index.get_mut(relay_url).ok_or("Relay not in index")?; + + // Apply 15-minute state retention rule + if state.should_clear_state() { + tracing::info!("Reconnect after >15min for {}, clearing state", relay_url); + state.clear_sync_state(); + } + + // Create new connection + state.connection_status = ConnectionStatus::Connecting; + let connection = RelayConnection::new(relay_url.to_string()); + + // Connect with since filter if we have last_connected + let since = state.last_connected.map(|ts| { + Timestamp::from(ts.as_u64().saturating_sub(900)) // -15 min buffer + }); + + connection.connect_and_subscribe_with_since(since).await?; + + state.connection = Some(connection); + state.connection_status = ConnectionStatus::Connected; + state.last_connected = Some(Timestamp::now()); + state.disconnected_at = None; + + drop(index); // Release lock + + // Regenerate AddFilters from current state (either retained or fresh from RepoSyncIndex) + self.regenerate_filters_for_relay(relay_url).await; + + Ok(()) +} + +/// Regenerate AddFilters for a relay after reconnection +async fn regenerate_filters_for_relay(&mut self, relay_url: &str) { + let repo_index = self.repo_sync_index.read().await; + let targets = derive_relay_targets(&repo_index); + + if let Some(target) = targets.get(relay_url) { + // Build filters for everything this relay should sync + let filters = build_filters(&target.repos, &target.root_events); + + // Create and process AddFilters action + let action = AddFilters { + relay_url: relay_url.to_string(), + repos: target.repos.clone(), + root_events: target.root_events.clone(), + filters, + }; + + self.handle_add_filters(action).await; + } +} +``` + +--- + +## Action Type + +```rust +/// Action sent from SelfSubscriber to SyncManager. +/// SyncManager auto-spawns relay connections if they don't exist. +pub struct AddFilters { + pub relay_url: String, + /// Items this action covers (for pending tracking) + pub repos: HashSet, + pub root_events: HashSet, + /// Pre-batched filters (each with <= 100 tags) + pub filters: Vec, +} +``` + +--- + +## Core Algorithms + +### 1. derive_relay_targets + +Transform RepoSyncIndex into per-relay sync targets: + +```rust +fn derive_relay_targets( + repo_index: &HashMap +) -> HashMap { + let mut targets: HashMap = HashMap::new(); + + for (repo_ref, needs) in repo_index { + for relay_url in &needs.relays { + let target = targets.entry(relay_url.clone()).or_default(); + target.repos.insert(repo_ref.clone()); + target.root_events.extend(needs.root_events.iter().cloned()); + } + } + + targets +} +``` + +### 2. compute_actions (Three-Way Diff) + +```rust +fn compute_actions( + targets: &HashMap, + pending: &HashMap>, + confirmed: &HashMap, +) -> Vec { + let mut actions = Vec::new(); + + for (relay_url, target) in targets { + // Skip disconnected relays - they'll get AddFilters on reconnect + if let Some(state) = confirmed.get(relay_url) { + if state.connection_status != ConnectionStatus::Connected { + continue; + } + } + + // Collect all pending items for this relay + let pending_repos: HashSet<_> = pending.get(relay_url) + .map(|batches| batches.iter() + .flat_map(|b| b.items.repos.iter().cloned()) + .collect()) + .unwrap_or_default(); + let pending_events: HashSet<_> = pending.get(relay_url) + .map(|batches| batches.iter() + .flat_map(|b| b.items.root_events.iter().cloned()) + .collect()) + .unwrap_or_default(); + + // Collect confirmed items for this relay + let confirmed_repos = confirmed.get(relay_url) + .map(|c| &c.repos) + .unwrap_or(&HashSet::new()); + let confirmed_events = confirmed.get(relay_url) + .map(|c| &c.root_events) + .unwrap_or(&HashSet::new()); + + // New = target - pending - confirmed + let new_repos: HashSet<_> = target.repos.iter() + .filter(|r| !pending_repos.contains(*r) && !confirmed_repos.contains(*r)) + .cloned() + .collect(); + let new_events: HashSet<_> = target.root_events.iter() + .filter(|e| !pending_events.contains(*e) && !confirmed_events.contains(*e)) + .cloned() + .collect(); + + if !new_repos.is_empty() || !new_events.is_empty() { + let filters = build_filters(&new_repos, &new_events); + actions.push(AddFilters { + relay_url: relay_url.clone(), + repos: new_repos, + root_events: new_events, + filters, + }); + } + } + + actions +} +``` + +### 3. handle_add_filters (SyncManager) + +```rust +impl SyncManager { + async fn handle_add_filters(&mut self, action: AddFilters) { + let AddFilters { relay_url, repos, root_events, filters } = action; + + // Auto-spawn connection if needed + if !self.connections.contains_key(&relay_url) { + self.spawn_connection(&relay_url).await; + } + + let conn = self.connections.get(&relay_url).unwrap(); + + // Subscribe and collect subscription IDs + // nostr-sdk 0.44: subscribe returns Output> + // since we're only subscribed to one relay per connection + let mut sub_ids = HashSet::new(); + for filter in filters { + // cloned filter for each subscription call + match conn.client.subscribe(filter, None).await { + Ok(output) => { + // Output contains subscription IDs for each relay + for sub_id in output.val { + sub_ids.insert(sub_id); + } + } + Err(e) => { + tracing::warn!("Failed to subscribe: {}", e); + } + } + } + + // Create pending batch + let batch = PendingBatch { + batch_id: self.next_batch_id(), + items: PendingItems { repos, root_events }, + outstanding_subs: sub_ids, + }; + + // Add to pending index + self.pending_sync_index.write().await + .entry(relay_url) + .or_default() + .push(batch); + } +} +``` + +### 4. handle_eose (Batch Completion) + +```rust +impl SyncManager { + async fn handle_eose(&mut self, relay_url: &str, sub_id: SubscriptionId) { + let mut pending = self.pending_sync_index.write().await; + + if let Some(batches) = pending.get_mut(relay_url) { + // Find which batch this subscription belongs to + for batch in batches.iter_mut() { + if batch.outstanding_subs.remove(&sub_id) { + // Check if batch is now complete + if batch.outstanding_subs.is_empty() { + // Move items to confirmed + let items = batch.items.clone(); + drop(pending); // Release lock before acquiring another + + let mut confirmed = self.relay_sync_index.write().await; + let relay_confirmed = confirmed + .entry(relay_url.to_string()) + .or_default(); + relay_confirmed.repos.extend(items.repos); + relay_confirmed.root_events.extend(items.root_events); + + tracing::info!( + "Batch {} complete for {} - confirmed {} repos, {} events", + batch.batch_id, relay_url, + items.repos.len(), items.root_events.len() + ); + } + break; + } + } + + // Clean up completed batches + if let Some(batches) = pending.get_mut(relay_url) { + batches.retain(|b| !b.outstanding_subs.is_empty()); + } + } + } +} +``` + +--- + +## Self-Subscriber Flow + +### State Tracking + +```rust +pub struct SelfSubscriber { + own_relay_url: String, + relay_domain: String, + repo_sync_index: RepoSyncIndex, + pending_sync_index: PendingSyncIndex, + relay_sync_index: RelaySyncIndex, + action_tx: mpsc::Sender, + /// Timestamp of last successful connection - used for since filter on reconnection + last_connected: Option, + /// Is this the first connection attempt since startup? + is_initial_connect: bool, +} +``` + +### On Startup + +```rust +impl SelfSubscriber { + async fn run(mut self) { + // Connect to own relay + let client = Client::new(Keys::generate()); + client.add_relay(&self.own_relay_url).await?; + client.connect().await; + + // Track connection time + self.last_connected = Some(Timestamp::now()); + + // Subscribe WITHOUT since filter (get all historical) on first connect + let filter = Filter::new().kinds([ + Kind::Custom(30617), // Repository announcements + Kind::GitPatch, // 1617 + Kind::Custom(1618), // PRs + Kind::Custom(1619), // PR updates + Kind::GitIssue, // 1621 + ]); + + client.subscribe(filter, None).await?; + self.is_initial_connect = false; + + // Run event loop with batching + self.event_loop(&client).await; + } +} +``` + +### On Reconnection + +```rust +impl SelfSubscriber { + async fn reconnect(&mut self, client: &Client) -> Result<(), Error> { + // Reconnect to own relay + client.connect().await; + + // On reconnection ONLY, use since filter based on last_connected + let since = match self.last_connected { + Some(ts) => Timestamp::from(ts.as_u64().saturating_sub(900)), // -15 minutes buffer + None => Timestamp::from(0), // Shouldn't happen, but fall back to full sync + }; + + // Update last_connected AFTER computing since + self.last_connected = Some(Timestamp::now()); + + let filter = Filter::new() + .kinds([ + Kind::Custom(30617), + Kind::GitPatch, + Kind::Custom(1618), + Kind::Custom(1619), + Kind::GitIssue, + ]) + .since(since); + + client.subscribe(filter, None).await?; + Ok(()) + } +} +``` + +### Batching Logic + +```rust +impl SelfSubscriber { + async fn event_loop(&self, client: &Client) { + let mut pending_events: Vec = Vec::new(); + let mut batch_timer: Option = None; + let batch_window = Duration::from_secs(5); + + loop { + let timeout = batch_timer + .map(|t| batch_window.saturating_sub(t.elapsed())) + .unwrap_or(Duration::from_secs(60)); + + tokio::select! { + notification = client.notifications().recv() => { + if let Ok(RelayPoolNotification::Event { event, .. }) = notification { + pending_events.push(*event); + + // Start timer on first event (does NOT reset) + if batch_timer.is_none() { + batch_timer = Some(Instant::now()); + } + } + } + _ = tokio::time::sleep(timeout), if batch_timer.is_some() => { + // Batch window elapsed + self.process_batch(pending_events.drain(..).collect()).await; + batch_timer = None; + } + } + } + } + + async fn process_batch(&self, events: Vec) { + // 1. Update RepoSyncIndex + for event in events { + match event.kind.as_u16() { + 30617 => self.handle_announcement(&event).await, + 1617 | 1618 | 1619 | 1621 => self.handle_root_event(&event).await, + _ => {} + } + } + + // 2. Derive targets and compute actions + let repo_index = self.repo_sync_index.read().await; + let targets = derive_relay_targets(&repo_index); + + let pending = self.pending_sync_index.read().await; + let confirmed = self.relay_sync_index.read().await; + + let actions = compute_actions(&targets, &pending, &confirmed); + + drop(repo_index); + drop(pending); + drop(confirmed); + + // 3. Send actions to SyncManager + for action in actions { + let _ = self.action_tx.send(action).await; + } + } +} +``` + +--- + +## Bootstrap Relay + +```rust +impl SyncManager { + async fn initialize_bootstrap(&mut self) { + if let Some(url) = &self.config.bootstrap_relay_url { + // Pre-mark as bootstrap (never removed) + self.relay_sync_index.write().await.insert( + url.clone(), + RelaySyncNeeds { + repos: HashSet::new(), + root_events: HashSet::new(), + is_bootstrap: true, + } + ); + + // Send Layer 1 filter + let filters = vec![ + Filter::new().kinds([Kind::Custom(30617), Kind::Custom(30618)]) + ]; + + self.handle_add_filters(AddFilters { + relay_url: url.clone(), + repos: HashSet::new(), // Layer 1 doesn't track specific repos + root_events: HashSet::new(), + filters, + }).await; + } + } +} +``` + +--- + +## Disconnect Handling + +Direct in SyncManager (not via action): + +```rust +impl SyncManager { + async fn check_disconnects(&mut self) { + let confirmed = self.relay_sync_index.read().await; + + for (relay_url, state) in confirmed.iter() { + if state.is_bootstrap { + continue; // Never disconnect bootstrap + } + + if state.repos.is_empty() && state.root_events.is_empty() { + // No repos - disconnect + self.disconnect_relay(relay_url).await; + } + } + } + + async fn disconnect_relay(&mut self, relay_url: &str) { + self.relay_sync_index.write().await.remove(relay_url); + self.pending_sync_index.write().await.remove(relay_url); + + if let Some(conn) = self.connections.remove(relay_url) { + conn.disconnect().await; + } + } +} +``` + +--- + +## Relay Connection Lifecycle + +### State Machine for External Relays + +```mermaid +stateDiagram-v2 + [*] --> Connecting: spawn_connection + Connecting --> Connected: success + Connecting --> Backoff: failure + Connected --> Disconnected: connection lost + Connected --> [*]: intentional disconnect + Disconnected --> Backoff: record_failure + Backoff --> Connecting: backoff elapsed + Backoff --> Dead: 24h continuous failures + Dead --> Connecting: daily retry +``` + +### Health Integration + +Uses `RelayHealthTracker` from [`src/sync/health.rs`](../../src/sync/health.rs): + +```rust +impl SyncManager { + /// Spawn a connection with health tracking + async fn spawn_connection(&mut self, relay_url: &str) { + // Check if we should attempt connection + if !self.health_tracker.should_attempt_connection(relay_url) { + let remaining = self.health_tracker.get_remaining_backoff(relay_url); + tracing::debug!( + "Skipping connection to {} - backoff {:?}", + relay_url, + remaining + ); + return; + } + + match self.try_connect(relay_url).await { + Ok(conn) => { + self.health_tracker.record_success(relay_url); + self.connections.insert(relay_url.to_string(), conn); + } + Err(e) => { + self.health_tracker.record_failure(relay_url); + tracing::warn!("Connection to {} failed: {}", relay_url, e); + } + } + } +} +``` + +### Reconnection Loop + +Each relay connection runs its own reconnection loop: + +```rust +impl RelayConnection { + async fn run_with_reconnection( + mut self, + health_tracker: Arc, + event_tx: mpsc::Sender, + ) { + loop { + // Check backoff before attempting + if !health_tracker.should_attempt_connection(&self.url) { + if let Some(remaining) = health_tracker.get_remaining_backoff(&self.url) { + tokio::time::sleep(remaining).await; + continue; + } + } + + // Attempt connection + match self.connect_and_subscribe().await { + Ok(()) => { + health_tracker.record_success(&self.url); + + // Track when we connected for since filter on reconnect + let connected_at = Timestamp::now(); + + // Run event loop until disconnection + self.run_event_loop(&event_tx).await; + + // Connection lost - will reconnect with since filter + health_tracker.record_failure(&self.url); + + // On reconnect, use since = connected_at - 15 minutes + self.set_reconnect_since(connected_at); + } + Err(e) => { + health_tracker.record_failure(&self.url); + tracing::warn!("Connection to {} failed: {}", self.url, e); + } + } + + // Get backoff duration and wait + let state = health_tracker.get_state(&self.url); + if state == HealthState::Dead { + // Dead relays retry once per 24 hours + tokio::time::sleep(Duration::from_secs(24 * 3600)).await; + } + // Otherwise, loop will check should_attempt_connection + } + } +} +``` + +### Backoff Configuration + +From existing [`RelayHealthTracker`](../../src/sync/health.rs:91): + +| Parameter | Value | Notes | +|-----------|-------|-------| +| Base backoff | 5 seconds | First failure | +| Backoff multiplier | 2x | Exponential increase | +| Max backoff | 1 hour (configurable) | `sync_max_backoff_secs` | +| Dead threshold | 24 hours | Continuous failures | +| Dead retry interval | 24 hours | Once per day | + +--- + +## Consolidation + +### Threshold-Based (70 filters) + +```rust +impl SyncManager { + async fn maybe_consolidate(&mut self, relay_url: &str) { + let filter_count = self.get_filter_count(relay_url).await; + + if filter_count > 70 { + self.consolidate(relay_url).await; + } + } + + async fn consolidate(&mut self, relay_url: &str) { + // 1. Wait for all pending batches to complete + self.wait_pending_complete(relay_url).await; + + // 2. Close all subscriptions + self.close_all_subs(relay_url).await; + + // 3. Rebuild filters from confirmed state + let confirmed = self.relay_sync_index.read().await; + let state = confirmed.get(relay_url)?; + let filters = build_filters(&state.repos, &state.root_events); + + // 4. Resubscribe with since = now - 15 minutes + let since = Timestamp::now() - 900; + for filter in filters { + self.subscribe(relay_url, filter.since(since)).await; + } + } +} +``` + +### Daily Timer (23-25h Random) + +```rust +impl SyncManager { + async fn run_daily_consolidation(&self) { + loop { + let hours = 23 + rand::random::() * 2.0; + tokio::time::sleep(Duration::from_secs_f64(hours * 3600.0)).await; + + for relay_url in self.connections.keys() { + self.consolidate(relay_url).await; + } + } + } +} +``` + +--- + +## Key Design Decisions + +| Decision | Choice | Rationale | +|----------|--------|-----------| +| Startup mechanism | Self-subscription only | Single code path, fresh DB behaves same as reconnect | +| Since filter | Only on reconnection | Initial subscribe gets full history | +| Pending tracking | Per-batch with batch ID | Independent confirmation, no blocking | +| EOSE requirement | All subs in batch must complete | Single repo may need multiple filter subs | +| Action type | Struct not enum | Only one action type needed | +| Relay spawning | Auto-spawn on AddFilters | Simplifies action logic | +| Disconnect | Direct in SyncManager | Not worth an action type | +| Consolidation | 70 filters + daily timer | Threshold for growth, timer for staleness | +| Timestamps | In-memory only | Not critical for correctness | +| Health tracking | Reuse existing RelayHealthTracker | Already implements exponential backoff, dead relay detection | +| Reconnection backoff | Exponential to 1h max | Prevents hammering failed relays | +| Dead relay policy | 24h threshold, daily retry | Balance between giving up and resource waste | +| last_connected tracking | Per-connection in-memory | Enables 15-minute buffer on reconnect | +| Connection ownership | Inside RelayState | Ties connection lifecycle to sync state, simpler than separate maps | +| State retention rule | Clear if disconnected >15min | Matches since filter buffer, prevents stale subscriptions | +| Skip disconnected | compute_actions skips disconnected | Prevents queuing AddFilters for offline relays | +| Reconnect triggers | handle_notifications returns or Shutdown | nostr-sdk signals disconnect via event loop exit | +| On-reconnect flow | Regenerate AddFilters from RepoSyncIndex | Fresh subscriptions for what we actually need | + +--- + +## Module Structure + +``` +src/sync/ +├── mod.rs # SyncManager, main loop +├── state.rs # RepoSyncIndex, RelaySyncIndex, PendingSyncIndex types +├── actions.rs # AddFilters struct, compute_actions +├── self_subscriber.rs # SelfSubscriber, batching logic +├── relay_connection.rs # Per-relay WebSocket connection +├── consolidation.rs # Consolidation logic, daily timer +├── health.rs # Health tracking (reuse from v2) +└── metrics.rs # Prometheus metrics (reuse from v2) \ No newline at end of file -- cgit v1.2.3