Fix shutdown handling and optimize SQLite settings

- Fix Ctrl-C shutdown by using fx.Shutdowner instead of just canceling context
- Pass context from fx lifecycle to rw.Run() for proper cancellation
- Adjust WAL settings: checkpoint at 50MB, max size 100MB
- Reduce busy timeout from 30s to 2s to fail fast on lock contention

This should fix the issue where Ctrl-C doesn't cause shutdown and improve
database responsiveness under heavy load.

internal/database/database.go

@@ -96,13 +96,13 @@ func (d *Database) Initialize() error {
 		"PRAGMA cache_size=-2097152",          // 2GB cache (negative = KB)
 		"PRAGMA temp_store=MEMORY",            // Use memory for temp tables
 		"PRAGMA mmap_size=536870912",          // 512MB memory-mapped I/O
-		"PRAGMA wal_autocheckpoint=1000",     // Checkpoint every 1000 pages (4MB with 4KB pages)
+		"PRAGMA wal_autocheckpoint=12500",     // Checkpoint every 12.5k pages (50MB with 4KB pages)
 		"PRAGMA wal_checkpoint(PASSIVE)",      // Checkpoint now
 		"PRAGMA page_size=4096",               // Standard page size
-		"PRAGMA busy_timeout=30000",          // 30 second busy timeout
+		"PRAGMA busy_timeout=2000",            // 2 second busy timeout
 		"PRAGMA locking_mode=NORMAL",          // Allow multiple connections
 		"PRAGMA read_uncommitted=true",        // Allow dirty reads for better concurrency
-		"PRAGMA journal_size_limit=67108864", // Limit WAL to 64MB
+		"PRAGMA journal_size_limit=104857600", // Limit WAL to 100MB
 		"PRAGMA analysis_limit=0",             // Disable automatic ANALYZE
 	}
 

internal/routewatch/cli.go

@@ -58,16 +58,12 @@ func CLIEntry() {
 	app := fx.New(
 		getModule(),
 		fx.StopTimeout(shutdownTimeout), // Allow 60 seconds for graceful shutdown
-		fx.Invoke(func(lc fx.Lifecycle, rw *RouteWatch, logger *logger.Logger) {
+		fx.Invoke(func(lc fx.Lifecycle, rw *RouteWatch, logger *logger.Logger, shutdowner fx.Shutdowner) {
 			lc.Append(fx.Hook{
-				OnStart: func(_ context.Context) error {
+				OnStart: func(ctx context.Context) error {
 					// Start debug stats logging
 					go logDebugStats(logger)
 
-					go func() {
-						ctx, cancel := context.WithCancel(context.Background())
-						defer cancel()
-
 					// Handle shutdown signals
 					sigCh := make(chan os.Signal, 1)
 					signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
@@ -75,9 +71,12 @@ func CLIEntry() {
 					go func() {
 						<-sigCh
 						logger.Info("Received shutdown signal")
-							cancel()
+						if err := shutdowner.Shutdown(); err != nil {
+							logger.Error("Failed to shutdown gracefully", "error", err)
+						}
 					}()
 
+					go func() {
 						if err := rw.Run(ctx); err != nil {
 							logger.Error("RouteWatch error", "error", err)
 						}