fix: stabilize WhatsApp connections and restore paired sessions on startup

cmd/evolution-go/main.go

@@ -181,7 +181,6 @@ func setupRouter(db *gorm.DB, authDB *sql.DB, sqliteDB *sql.DB, config *config.C
 	)
 	instanceService := instance_service.NewInstanceService(
 		instanceRepository,
-		killChannel,
 		clientPointer,
 		whatsmeowService,
 		config,

pkg/config/config.go

@@ -242,7 +242,7 @@ func Load() *Config {
 
 	connectOnStartup := os.Getenv(config_env.CONNECT_ON_STARTUP)
 	if connectOnStartup == "" {
-		connectOnStartup = "false"
+		connectOnStartup = "true"
 	}
 
 	osName := os.Getenv(config_env.OS_NAME)

pkg/instance/handler/instance_handler.go

@@ -1,6 +1,7 @@
 package instance_handler
 
 import (
+	"errors"
 	"net/http"
 	"time"
 
@@ -282,6 +283,10 @@ func (i *instanceHandler) Qr(ctx *gin.Context) {
 
 	qrcode, err := i.instanceService.GetQr(instance)
 	if err != nil {
+		if errors.Is(err, instance_service.ErrSessionAlreadyLoggedIn) {
+			ctx.JSON(http.StatusConflict, gin.H{"error": err.Error(), "connected": true})
+			return
+		}
 		ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}

pkg/instance/repository/instance_repository.go

@@ -28,6 +28,8 @@ type InstanceRepository interface {
 	UpdateJid(userId string, jid string) error
 	GetAllConnectedInstances() ([]*instance_model.Instance, error)
 	GetAllConnectedInstancesByClientName(clientName string) ([]*instance_model.Instance, error)
+	GetAllPairedInstances() ([]*instance_model.Instance, error)
+	GetAllPairedInstancesByClientName(clientName string) ([]*instance_model.Instance, error)
 	GetAll(clientName string) ([]*instance_model.Instance, error)
 	Delete(instanceId string) error
 	GetAdvancedSettings(instanceId string) (*instance_model.AdvancedSettings, error)
@@ -136,6 +138,31 @@ func (i *instanceRepository) GetAllConnectedInstancesByClientName(clientName str
 	return instances, nil
 }
 
+// GetAllPairedInstances returns instances that have already completed pairing.
+// The Connected column is intentionally not used here: it represents the live
+// socket state and is expected to become false during a redeploy or process
+// restart. Using it as the startup selector prevents valid persisted sessions
+// from being restored after the application comes back up.
+func (i *instanceRepository) GetAllPairedInstances() ([]*instance_model.Instance, error) {
+	var instances []*instance_model.Instance
+	err := i.db.Where("jid IS NOT NULL AND TRIM(jid) <> ''").Find(&instances).Error
+	if err != nil {
+		return nil, err
+	}
+
+	return instances, nil
+}
+
+func (i *instanceRepository) GetAllPairedInstancesByClientName(clientName string) ([]*instance_model.Instance, error) {
+	var instances []*instance_model.Instance
+	err := i.db.Where("jid IS NOT NULL AND TRIM(jid) <> '' AND client_name = ?", clientName).Find(&instances).Error
+	if err != nil {
+		return nil, err
+	}
+
+	return instances, nil
+}
+
 func (i *instanceRepository) GetAll(clientName string) ([]*instance_model.Instance, error) {
 	var instances []*instance_model.Instance
 	err := i.db.Where("client_name = ?", clientName).Find(&instances).Error