Remove dead warmUpSession code and config

The warmUpSession sleep was replaced by the proper WaitForPeersReady
barrier handshake but the old code and config were never cleaned up.

Author: anhthii

config.yaml.template

@@ -21,7 +21,6 @@ backup_period_seconds: 300 # 5 minutes
 backup_dir: backups
 max_concurrent_keygen: 2
 max_concurrent_signing: 10
-session_warm_up_delay_ms: 100
 healthcheck:
   enabled: false  # disabled by default, set to true for cloud deployment
   address: "0.0.0.0:8080"

pkg/eventconsumer/event_consumer.go

@@ -27,8 +27,6 @@ const (
 
 	DefaultConcurrentKeygen   = 2
 	DefaultConcurrentSigning  = 20
-	DefaultSessionWarmUpDelay = 200
-
 	KeyGenTimeOut = 30 * time.Second
 )
 
@@ -55,8 +53,6 @@ type eventConsumer struct {
 	signingMsgBuffer     chan *nats.Msg
 	maxConcurrentKeygen  int
 	maxConcurrentSigning int
-	sessionWarmUpDelayMs int
-
 	// Track active sessions with timestamps for cleanup
 	activeSessions  map[string]time.Time // Maps "walletID-txID" to creation time
 	sessionsLock    sync.RWMutex
@@ -83,19 +79,12 @@ func NewEventConsumer(
 		maxConcurrentSigning = DefaultConcurrentSigning
 	}
 
-	sessionWarmUpDelayMs := viper.GetInt("session_warm_up_delay_ms")
-	if sessionWarmUpDelayMs == 0 {
-		sessionWarmUpDelayMs = DefaultSessionWarmUpDelay
-	}
-
 	logger.Info(
 		"Initializing event consumer",
 		"max_concurrent_keygen",
 		maxConcurrentKeygen,
 		"max_concurrent_signing",
 		maxConcurrentSigning,
-		"session_warm_up_delay_ms",
-		sessionWarmUpDelayMs,
 	)
 
 	ec := &eventConsumer{
@@ -114,7 +103,6 @@ func NewEventConsumer(
 		identityStore:        identityStore,
 		keygenMsgBuffer:      make(chan *nats.Msg, 100),
 		signingMsgBuffer:     make(chan *nats.Msg, 200), // Larger buffer for signing
-		sessionWarmUpDelayMs: sessionWarmUpDelayMs,
 	}
 
 	go ec.startKeyGenEventWorker()
@@ -144,10 +132,6 @@ func (ec *eventConsumer) Run() {
 	logger.Info("MPC Event consumer started...!")
 }
 
-func (ec *eventConsumer) warmUpSession() {
-	time.Sleep(time.Duration(ec.sessionWarmUpDelayMs) * time.Millisecond)
-}
-
 func (ec *eventConsumer) handleKeyGenEvent(natMsg *nats.Msg) {
 	baseCtx, baseCancel := context.WithTimeout(context.Background(), KeyGenTimeOut)
 	defer baseCancel()