feat(sync): Phase 3 - resilience and health tracking

- Add RelayHealthTracker with DashMap
- Implement exponential backoff (5s -> 1h max)
- Handle dead relays (24h failures -> daily retry)
- Add startup jitter to prevent thundering herd
- Add NGIT_SYNC_MAX_BACKOFF_SECS config

1 files changed, 2 insertions, 0 deletions

diff --git a/src/http/nip11.rs b/src/http/nip11.rs
index e9e1c25..22e5b22 100644
--- a/src/http/nip11.rs
+++ b/src/http/nip11.rs
@@ -106,6 +106,7 @@ mod tests {
             metrics_connection_per_ip_abuse_threshold: 10,
             metrics_top_n_repos: 10,
             sync_relay_url: None,
+            sync_max_backoff_secs: 3600,
         };
 
         let doc = RelayInformationDocument::from_config(&config);
@@ -141,6 +142,7 @@ mod tests {
             metrics_connection_per_ip_abuse_threshold: 10,
             metrics_top_n_repos: 10,
             sync_relay_url: None,
+            sync_max_backoff_secs: 3600,
         };
 
         let doc = RelayInformationDocument::from_config(&config);