Merge relay.ngit.dev migration: bug fixes and migration tooling

This merge includes critical bug fixes and comprehensive migration tooling
developed during the relay.ngit.dev migration effort.

Bug Fixes:
- Fix git protocol error handling to return HTTP 200 with ERR pkt-line
- Fix naughty list false positives and DNS failure identification
- Fix database query filters in load_existing_events (remove .since())
- Fix OID fetch tracking to distinguish 0 OIDs from successful fetches
- Fix purgatory event source tracking for filtered expiry logging
- Implement OID retry logic for 'not our ref' errors

Migration Tools & Documentation:
- Complete 5-phase migration analysis pipeline with orchestration script
- Phase 1: Event fetching from source relay
- Phase 2: Git sync verification
- Phase 3: Categorization and relay comparison
- Phase 4: Log extraction (parse failures, purgatory expiry)
- Phase 5: Action classification for migration decisions
- Comprehensive migration guide with lessons learned
- Troubleshooting guide for permission and corruption issues

Configuration:
- Add NGIT_LOG_LEVEL configuration option
- Update git throttle limits to 60/minute
- Improve logging throughout for better observability

1 files changed, 10 insertions, 10 deletions

diff --git a/src/main.rs b/src/main.rs
index 5e5b83a..6c9da05 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,8 +3,8 @@ use std::{path::PathBuf, sync::Arc};
 
 use anyhow::Result;
 use tokio::signal;
-use tracing::{error, info, warn, Level};
-use tracing_subscriber::FmtSubscriber;
+use tracing::{error, info, warn};
+use tracing_subscriber::{EnvFilter, FmtSubscriber};
 
 use ngit_grasp::{
     config::{Config, DatabaseBackend},
@@ -17,16 +17,16 @@ use ngit_grasp::{
 
 #[tokio::main]
 async fn main() -> Result<()> {
-    // Initialize tracing
+    // Load configuration first (priority: CLI flags > env vars > .env file > defaults)
+    let config = Config::load()?;
+
+    // Initialize tracing with configured log level
     let subscriber = FmtSubscriber::builder()
-        .with_max_level(Level::DEBUG)
+        .with_env_filter(EnvFilter::new(&config.log_level))
         .finish();
     tracing::subscriber::set_global_default(subscriber)?;
 
-    info!("Starting ngit-grasp with nostr-relay-builder...");
-
-    // Load configuration (priority: CLI flags > env vars > .env file > defaults)
-    let config = Config::load()?;
+    info!("Starting ngit-grasp with log level: {}", config.log_level);
 
     // Validate configuration and fail fast on fatal errors
     // Recoverable issues (e.g., malformed whitelist entries) are logged as warnings
@@ -187,8 +187,8 @@ async fn main() -> Result<()> {
         ));
 
         // Create throttle manager for rate limiting remote git servers
-        // Default: 5 concurrent requests per domain, 30 requests per minute per domain
-        let throttle_manager = Arc::new(ThrottleManager::new(5, 30));
+        // Default: 5 concurrent requests per domain, 60 requests per minute per domain
+        let throttle_manager = Arc::new(ThrottleManager::new(5, 60));
         throttle_manager.set_context(sync_ctx.clone());
         throttle_manager.set_git_naughty_list(git_naughty_list.clone());