Remove LastSuccessfulUpdate from Machine

This field is no longer used, it was used in our old state
"algorithm" to determine if we should send an update.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

hscontrol/db/machine.go

@@ -318,11 +318,8 @@ func (hsdb *HSDatabase) MachineSetExpiry(machine *types.Machine, expiry time.Tim
 }
 
 func (hsdb *HSDatabase) machineSetExpiry(machine *types.Machine, expiry time.Time) error {
-	now := time.Now()
-
 	if err := hsdb.db.Model(machine).Updates(types.Machine{
-		LastSuccessfulUpdate: &now,
-		Expiry:               &expiry,
+		Expiry: &expiry,
 	}).Error; err != nil {
 		return fmt.Errorf(
 			"failed to refresh machine (update expiration) in the database: %w",

hscontrol/grpcv1.go

@@ -532,9 +532,8 @@ func (api headscaleV1APIServer) DebugCreateMachine(
 		GivenName:  givenName,
 		User:       *user,
 
-		Expiry:               &time.Time{},
-		LastSeen:             &time.Time{},
-		LastSuccessfulUpdate: &time.Time{},
+		Expiry:   &time.Time{},
+		LastSeen: &time.Time{},
 
 		HostInfo: types.HostInfo(hostinfo),
 	}

hscontrol/types/machine.go

@@ -53,9 +53,8 @@ type Machine struct {
 	AuthKeyID uint
 	AuthKey   *PreAuthKey
 
-	LastSeen             *time.Time
-	LastSuccessfulUpdate *time.Time
-	Expiry               *time.Time
+	LastSeen *time.Time
+	Expiry   *time.Time
 
 	HostInfo  HostInfo
 	Endpoints StringList
@@ -246,12 +245,6 @@ func (machine *Machine) Proto() *v1.Machine {
 		machineProto.LastSeen = timestamppb.New(*machine.LastSeen)
 	}
 
-	if machine.LastSuccessfulUpdate != nil {
-		machineProto.LastSuccessfulUpdate = timestamppb.New(
-			*machine.LastSuccessfulUpdate,
-		)
-	}
-
 	if machine.Expiry != nil {
 		machineProto.Expiry = timestamppb.New(*machine.Expiry)
 	}