Rename handlers and add PrefixHandler for database routing table

- Renamed BatchedDatabaseHandler to DBHandler
- Renamed BatchedPeerHandler to PeerHandler
- Quadrupled DBHandler batch size from 4000 to 16000
- Created new PrefixHandler using same batching strategy to maintain routing table in database
- Removed verbose batch flush logging from all handlers
- Updated app.go to use renamed handlers and register PrefixHandler
- Fixed test configuration to enable batched database writes

internal/server/server.go

@@ -145,7 +145,6 @@ func (s *Server) handleStatusJSON() http.HandlerFunc {
 		errChan := make(chan error)
 
 		go func() {
-			s.logger.Debug("Starting database stats query")
 			dbStats, err := s.db.GetStats()
 			if err != nil {
 				s.logger.Debug("Database stats query failed", "error", err)
@@ -153,7 +152,6 @@ func (s *Server) handleStatusJSON() http.HandlerFunc {
 
 				return
 			}
-			s.logger.Debug("Database stats query completed")
 			statsChan <- dbStats
 		}()
 
@@ -287,7 +285,6 @@ func (s *Server) handleStats() http.HandlerFunc {
 		errChan := make(chan error)
 
 		go func() {
-			s.logger.Debug("Starting database stats query")
 			dbStats, err := s.db.GetStats()
 			if err != nil {
 				s.logger.Debug("Database stats query failed", "error", err)
@@ -295,7 +292,6 @@ func (s *Server) handleStats() http.HandlerFunc {
 
 				return
 			}
-			s.logger.Debug("Database stats query completed")
 			statsChan <- dbStats
 		}()