refactor: migrate to latest Corrosion version 2026.5.14 for ucind (compare versions vector for store sync)

internal/cli/cli.go

@@ -434,8 +434,8 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
 		return nil, nil, fmt.Errorf("add machine to cluster (context '%s'): %w", contextName, err)
 	}
 
-	// Get the current store DB version from the cluster to pass to the join request.
+	// Snapshot the cluster store version so the new machine can catch up before participating.
-	var storeDBVersion int64
+	var storeVersion map[string]int64
 	inspectResp, err := c.MachineClient.InspectMachine(ctx, &emptypb.Empty{})
 	if err != nil {
 		// TODO(lhf): remove Unimplemented check when v0.17.0 is released.
@@ -443,7 +443,7 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
 			return nil, nil, fmt.Errorf("inspect current cluster machine: %w", err)
 		}
 	} else {
-		storeDBVersion = inspectResp.Machines[0].StoreDbVersion
+		storeVersion = inspectResp.Machines[0].StoreVersion
 	}
 
 	// Get the most up-to-date list of other machines in the cluster to include them in the join request.
@@ -462,7 +462,7 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
 	joinReq := &pb.JoinClusterRequest{
 		Machine:         addResp.Machine,
 		OtherMachines:   otherMachines,
-		MinStoreDbVersion: storeDBVersion,
+		MinStoreVersion: storeVersion,
 		WireguardPort:   int32(opts.WireguardPort),
 	}
 	if _, err = machineClient.JoinCluster(ctx, joinReq); err != nil {

internal/machine/api/pb/machine.pb.go

@@ -391,10 +391,11 @@ type JoinClusterRequest struct {
 
 	Machine       *MachineInfo   `protobuf:"bytes,1,opt,name=machine,proto3" json:"machine,omitempty"`
 	OtherMachines []*MachineInfo `protobuf:"bytes,3,rep,name=other_machines,json=otherMachines,proto3" json:"other_machines,omitempty"`
-	// Minimum store database version the new machine should sync to before starting cluster operations.
-	MinStoreDbVersion int64 `protobuf:"varint,4,opt,name=min_store_db_version,json=minStoreDbVersion,proto3" json:"min_store_db_version,omitempty"`
 	// WireGuard listen port for this machine. Uses the default port (51820) if 0 or not set.
 	WireguardPort int32 `protobuf:"varint,5,opt,name=wireguard_port,json=wireguardPort,proto3" json:"wireguard_port,omitempty"`
+	// Cluster store version this machine must reach before participating.
+	// Per-actor vector (Corrosion actor UUID → max applied db_version).
+	MinStoreVersion map[string]int64 `protobuf:"bytes,6,rep,name=min_store_version,json=minStoreVersion,proto3" json:"min_store_version,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
 }
 
 func (x *JoinClusterRequest) Reset() {
@@ -443,13 +444,6 @@ func (x *JoinClusterRequest) GetOtherMachines() []*MachineInfo {
 	return nil
 }
 
-func (x *JoinClusterRequest) GetMinStoreDbVersion() int64 {
-	if x != nil {
-		return x.MinStoreDbVersion
-	}
-	return 0
-}
-
 func (x *JoinClusterRequest) GetWireguardPort() int32 {
 	if x != nil {
 		return x.WireguardPort
@@ -457,6 +451,13 @@ func (x *JoinClusterRequest) GetWireguardPort() int32 {
 	return 0
 }
 
+func (x *JoinClusterRequest) GetMinStoreVersion() map[string]int64 {
+	if x != nil {
+		return x.MinStoreVersion
+	}
+	return nil
+}
+
 type InspectMachineResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -512,10 +513,11 @@ type MachineDetails struct {
 
 	Metadata *Metadata    `protobuf:"bytes,1,opt,name=metadata,proto3" json:"metadata,omitempty"`
 	Machine  *MachineInfo `protobuf:"bytes,2,opt,name=machine,proto3" json:"machine,omitempty"`
-	// Current Corrosion cr-sqlite database version (Lamport timestamp) of the cluster store.
-	StoreDbVersion int64 `protobuf:"varint,3,opt,name=store_db_version,json=storeDbVersion,proto3" json:"store_db_version,omitempty"`
 	// Round-trip times to other machines in the cluster, keyed by peer machine ID.
 	Rtts map[string]*RTTStats `protobuf:"bytes,4,rep,name=rtts,proto3" json:"rtts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Current cluster store version observed on this machine.
+	// Per-actor vector (Corrosion actor UUID → max applied db_version) read from Corrosion crsql_db_versions.
+	StoreVersion map[string]int64 `protobuf:"bytes,5,rep,name=store_version,json=storeVersion,proto3" json:"store_version,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
 }
 
 func (x *MachineDetails) Reset() {
@@ -564,13 +566,6 @@ func (x *MachineDetails) GetMachine() *MachineInfo {
 	return nil
 }
 
-func (x *MachineDetails) GetStoreDbVersion() int64 {
-	if x != nil {
-		return x.StoreDbVersion
-	}
-	return 0
-}
-
 func (x *MachineDetails) GetRtts() map[string]*RTTStats {
 	if x != nil {
 		return x.Rtts
@@ -578,6 +573,13 @@ func (x *MachineDetails) GetRtts() map[string]*RTTStats {
 	return nil
 }
 
+func (x *MachineDetails) GetStoreVersion() map[string]int64 {
+	if x != nil {
+		return x.StoreVersion
+	}
+	return nil
+}
+
 type TokenResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1054,7 +1056,7 @@ type Service_Container struct {
 func (x *Service_Container) Reset() {
 	*x = Service_Container{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[17]
+		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1067,7 +1069,7 @@ func (x *Service_Container) String() string {
 func (*Service_Container) ProtoMessage() {}
 
 func (x *Service_Container) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[17]
+	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1158,7 +1160,7 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
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@@ -1166,33 +1168,46 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
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@@ -1311,7 +1326,7 @@ func file_internal_machine_api_pb_machine_proto_rawDescGZIP() []byte {
 	return file_internal_machine_api_pb_machine_proto_rawDescData
 }
 
-var file_internal_machine_api_pb_machine_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
+var file_internal_machine_api_pb_machine_proto_msgTypes = make([]protoimpl.MessageInfo, 20)
 var file_internal_machine_api_pb_machine_proto_goTypes = []any{
 	(*MachineInfo)(nil),                     // 0: api.MachineInfo
 	(*NetworkConfig)(nil),                   // 1: api.NetworkConfig
@@ -1329,66 +1344,70 @@ var file_internal_machine_api_pb_machine_proto_goTypes = []any{
 	(*InspectWireGuardNetworkResponse)(nil), // 13: api.InspectWireGuardNetworkResponse
 	(*WireGuardPeer)(nil),                   // 14: api.WireGuardPeer
 	(*RTTStats)(nil),                        // 15: api.RTTStats
-	nil,                                     // 16: api.MachineDetails.RttsEntry
+	nil,                                     // 16: api.JoinClusterRequest.MinStoreVersionEntry
-	(*Service_Container)(nil),               // 17: api.Service.Container
+	nil,                                     // 17: api.MachineDetails.RttsEntry
-	(*IP)(nil),                              // 18: api.IP
+	nil,                                     // 18: api.MachineDetails.StoreVersionEntry
-	(*IPPrefix)(nil),                        // 19: api.IPPrefix
+	(*Service_Container)(nil),               // 19: api.Service.Container
-	(*IPPort)(nil),                          // 20: api.IPPort
+	(*IP)(nil),                              // 20: api.IP
-	(*Metadata)(nil),                        // 21: api.Metadata
+	(*IPPrefix)(nil),                        // 21: api.IPPrefix
-	(*timestamppb.Timestamp)(nil),           // 22: google.protobuf.Timestamp
+	(*IPPort)(nil),                          // 22: api.IPPort
-	(*durationpb.Duration)(nil),             // 23: google.protobuf.Duration
+	(*Metadata)(nil),                        // 23: api.Metadata
-	(*emptypb.Empty)(nil),                   // 24: google.protobuf.Empty
+	(*timestamppb.Timestamp)(nil),           // 24: google.protobuf.Timestamp
-	(*LogsRequest)(nil),                     // 25: api.LogsRequest
+	(*durationpb.Duration)(nil),             // 25: google.protobuf.Duration
-	(*LogEntry)(nil),                        // 26: api.LogEntry
+	(*emptypb.Empty)(nil),                   // 26: google.protobuf.Empty
+	(*LogsRequest)(nil),                     // 27: api.LogsRequest
+	(*LogEntry)(nil),                        // 28: api.LogEntry
 }
 var file_internal_machine_api_pb_machine_proto_depIdxs = []int32{
 	1,  // 0: api.MachineInfo.network:type_name -> api.NetworkConfig
-	18, // 1: api.MachineInfo.public_ip:type_name -> api.IP
+	20, // 1: api.MachineInfo.public_ip:type_name -> api.IP
-	19, // 2: api.NetworkConfig.subnet:type_name -> api.IPPrefix
+	21, // 2: api.NetworkConfig.subnet:type_name -> api.IPPrefix
-	18, // 3: api.NetworkConfig.management_ip:type_name -> api.IP
+	20, // 3: api.NetworkConfig.management_ip:type_name -> api.IP
-	20, // 4: api.NetworkConfig.endpoints:type_name -> api.IPPort
+	22, // 4: api.NetworkConfig.endpoints:type_name -> api.IPPort
-	19, // 5: api.InitClusterRequest.network:type_name -> api.IPPrefix
+	21, // 5: api.InitClusterRequest.network:type_name -> api.IPPrefix
-	18, // 6: api.InitClusterRequest.public_ip:type_name -> api.IP
+	20, // 6: api.InitClusterRequest.public_ip:type_name -> api.IP
-	20, // 7: api.InitClusterRequest.wireguard_endpoints:type_name -> api.IPPort
+	22, // 7: api.InitClusterRequest.wireguard_endpoints:type_name -> api.IPPort
 	0,  // 8: api.InitClusterResponse.machine:type_name -> api.MachineInfo
 	0,  // 9: api.JoinClusterRequest.machine:type_name -> api.MachineInfo
 	0,  // 10: api.JoinClusterRequest.other_machines:type_name -> api.MachineInfo
-	7,  // 11: api.InspectMachineResponse.machines:type_name -> api.MachineDetails
+	16, // 11: api.JoinClusterRequest.min_store_version:type_name -> api.JoinClusterRequest.MinStoreVersionEntry
-	21, // 12: api.MachineDetails.metadata:type_name -> api.Metadata
+	7,  // 12: api.InspectMachineResponse.machines:type_name -> api.MachineDetails
-	0,  // 13: api.MachineDetails.machine:type_name -> api.MachineInfo
+	23, // 13: api.MachineDetails.metadata:type_name -> api.Metadata
-	16, // 14: api.MachineDetails.rtts:type_name -> api.MachineDetails.RttsEntry
+	0,  // 14: api.MachineDetails.machine:type_name -> api.MachineInfo
-	17, // 15: api.Service.containers:type_name -> api.Service.Container
+	17, // 15: api.MachineDetails.rtts:type_name -> api.MachineDetails.RttsEntry
-	10, // 16: api.InspectServiceResponse.service:type_name -> api.Service
+	18, // 16: api.MachineDetails.store_version:type_name -> api.MachineDetails.StoreVersionEntry
-	14, // 17: api.InspectWireGuardNetworkResponse.peers:type_name -> api.WireGuardPeer
+	19, // 17: api.Service.containers:type_name -> api.Service.Container
-	22, // 18: api.WireGuardPeer.last_handshake_time:type_name -> google.protobuf.Timestamp
+	10, // 18: api.InspectServiceResponse.service:type_name -> api.Service
-	23, // 19: api.RTTStats.median:type_name -> google.protobuf.Duration
+	14, // 19: api.InspectWireGuardNetworkResponse.peers:type_name -> api.WireGuardPeer
-	23, // 20: api.RTTStats.std_dev:type_name -> google.protobuf.Duration
+	24, // 20: api.WireGuardPeer.last_handshake_time:type_name -> google.protobuf.Timestamp
-	15, // 21: api.MachineDetails.RttsEntry.value:type_name -> api.RTTStats
+	25, // 21: api.RTTStats.median:type_name -> google.protobuf.Duration
-	24, // 22: api.Machine.CheckPrerequisites:input_type -> google.protobuf.Empty
+	25, // 22: api.RTTStats.std_dev:type_name -> google.protobuf.Duration
-	3,  // 23: api.Machine.InitCluster:input_type -> api.InitClusterRequest
+	15, // 23: api.MachineDetails.RttsEntry.value:type_name -> api.RTTStats
-	5,  // 24: api.Machine.JoinCluster:input_type -> api.JoinClusterRequest
+	26, // 24: api.Machine.CheckPrerequisites:input_type -> google.protobuf.Empty
-	24, // 25: api.Machine.Token:input_type -> google.protobuf.Empty
+	3,  // 25: api.Machine.InitCluster:input_type -> api.InitClusterRequest
-	24, // 26: api.Machine.Inspect:input_type -> google.protobuf.Empty
+	5,  // 26: api.Machine.JoinCluster:input_type -> api.JoinClusterRequest
-	24, // 27: api.Machine.InspectMachine:input_type -> google.protobuf.Empty
+	26, // 27: api.Machine.Token:input_type -> google.protobuf.Empty
-	24, // 28: api.Machine.InspectWireGuardNetwork:input_type -> google.protobuf.Empty
+	26, // 28: api.Machine.Inspect:input_type -> google.protobuf.Empty
-	9,  // 29: api.Machine.Reset:input_type -> api.ResetRequest
+	26, // 29: api.Machine.InspectMachine:input_type -> google.protobuf.Empty
-	11, // 30: api.Machine.InspectService:input_type -> api.InspectServiceRequest
+	26, // 30: api.Machine.InspectWireGuardNetwork:input_type -> google.protobuf.Empty
-	25, // 31: api.Machine.MachineLogs:input_type -> api.LogsRequest
+	9,  // 31: api.Machine.Reset:input_type -> api.ResetRequest
-	2,  // 32: api.Machine.CheckPrerequisites:output_type -> api.CheckPrerequisitesResponse
+	11, // 32: api.Machine.InspectService:input_type -> api.InspectServiceRequest
-	4,  // 33: api.Machine.InitCluster:output_type -> api.InitClusterResponse
+	27, // 33: api.Machine.MachineLogs:input_type -> api.LogsRequest
-	24, // 34: api.Machine.JoinCluster:output_type -> google.protobuf.Empty
+	2,  // 34: api.Machine.CheckPrerequisites:output_type -> api.CheckPrerequisitesResponse
-	8,  // 35: api.Machine.Token:output_type -> api.TokenResponse
+	4,  // 35: api.Machine.InitCluster:output_type -> api.InitClusterResponse
-	0,  // 36: api.Machine.Inspect:output_type -> api.MachineInfo
+	26, // 36: api.Machine.JoinCluster:output_type -> google.protobuf.Empty
-	6,  // 37: api.Machine.InspectMachine:output_type -> api.InspectMachineResponse
+	8,  // 37: api.Machine.Token:output_type -> api.TokenResponse
-	13, // 38: api.Machine.InspectWireGuardNetwork:output_type -> api.InspectWireGuardNetworkResponse
+	0,  // 38: api.Machine.Inspect:output_type -> api.MachineInfo
-	24, // 39: api.Machine.Reset:output_type -> google.protobuf.Empty
+	6,  // 39: api.Machine.InspectMachine:output_type -> api.InspectMachineResponse
-	12, // 40: api.Machine.InspectService:output_type -> api.InspectServiceResponse
+	13, // 40: api.Machine.InspectWireGuardNetwork:output_type -> api.InspectWireGuardNetworkResponse
-	26, // 41: api.Machine.MachineLogs:output_type -> api.LogEntry
+	26, // 41: api.Machine.Reset:output_type -> google.protobuf.Empty
-	32, // [32:42] is the sub-list for method output_type
+	12, // 42: api.Machine.InspectService:output_type -> api.InspectServiceResponse
-	22, // [22:32] is the sub-list for method input_type
+	28, // 43: api.Machine.MachineLogs:output_type -> api.LogEntry
-	22, // [22:22] is the sub-list for extension type_name
+	34, // [34:44] is the sub-list for method output_type
-	22, // [22:22] is the sub-list for extension extendee
+	24, // [24:34] is the sub-list for method input_type
-	0,  // [0:22] is the sub-list for field type_name
+	24, // [24:24] is the sub-list for extension type_name
+	24, // [24:24] is the sub-list for extension extendee
+	0,  // [0:24] is the sub-list for field type_name
 }
 
 func init() { file_internal_machine_api_pb_machine_proto_init() }
@@ -1590,7 +1609,7 @@ func file_internal_machine_api_pb_machine_proto_init() {
 				return nil
 			}
 		}
-		file_internal_machine_api_pb_machine_proto_msgTypes[17].Exporter = func(v any, i int) any {
+		file_internal_machine_api_pb_machine_proto_msgTypes[19].Exporter = func(v any, i int) any {
 			switch v := v.(*Service_Container); i {
 			case 0:
 				return &v.state
@@ -1613,7 +1632,7 @@ func file_internal_machine_api_pb_machine_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_internal_machine_api_pb_machine_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   18,
+			NumMessages:   20,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

internal/machine/api/pb/machine.proto

@@ -73,10 +73,11 @@ message InitClusterResponse {
 message JoinClusterRequest {
   MachineInfo machine = 1;
   repeated MachineInfo other_machines = 3;
-  // Minimum store database version the new machine should sync to before starting cluster operations.
-  int64 min_store_db_version = 4;
   // WireGuard listen port for this machine. Uses the default port (51820) if 0 or not set.
   int32 wireguard_port = 5;
+  // Cluster store version this machine must reach before participating.
+  // Per-actor vector (Corrosion actor UUID → max applied db_version).
+  map<string, int64> min_store_version = 6;
 }
 
 message InspectMachineResponse {
@@ -87,10 +88,11 @@ message InspectMachineResponse {
 message MachineDetails {
   Metadata metadata = 1;
   MachineInfo machine = 2;
-  // Current Corrosion cr-sqlite database version (Lamport timestamp) of the cluster store.
-  int64 store_db_version = 3;
   // Round-trip times to other machines in the cluster, keyed by peer machine ID.
   map<string, RTTStats> rtts = 4;
+  // Current cluster store version observed on this machine.
+  // Per-actor vector (Corrosion actor UUID → max applied db_version) read from Corrosion crsql_db_versions.
+  map<string, int64> store_version = 5;
 }
 
 message TokenResponse {

internal/machine/cluster.go

@@ -96,7 +96,8 @@ func newClusterController(
 func (cc *clusterController) Run(ctx context.Context) error {
 	defer close(cc.stopped)
 
-	if err := firewall.ConfigureIptablesChains(network.MachineIP(cc.state.Network.Subnet), cc.state.Network.EffectiveWireGuardPort()); err != nil {
+	if err := firewall.ConfigureIptablesChains(network.MachineIP(cc.state.Network.Subnet),
+		cc.state.Network.EffectiveWireGuardPort()); err != nil {
 		return fmt.Errorf("configure iptables chains: %w", err)
 	}
 
@@ -159,7 +160,9 @@ func (cc *clusterController) Run(ctx context.Context) error {
 	// Wait for the store database to sync to the minimum version before starting store-dependent components.
 	// This prevents issues with using partially replicated data when the machine just joined the cluster,
 	// e.g., an empty machine list causing WireGuard peer misconfiguration.
-	cc.waitStoreSync(ctx)
+	if err = cc.waitStoreSync(ctx); err != nil {
+		return fmt.Errorf("wait initial cluster store sync: %w", err)
+	}
 
 	// Check if waitStoreSync exited because the context was cancelled. Return early in that case.
 	if ctx.Err() != nil {
@@ -341,101 +344,114 @@ func (cc *clusterController) handleEndpointChanges(ctx context.Context) {
 	}
 }
 
-// waitStoreSync waits for the store database to sync to the minimum required DB version if set in the machine state.
+// waitStoreSync blocks until the local store version >= state.MinStoreVersion and any known gaps are synced.
-// Blocks until synced or context is cancelled.
+// No-op when MinStoreVersion is empty. Clears state.MinStoreVersion when reached.
-func (cc *clusterController) waitStoreSync(ctx context.Context) {
+func (cc *clusterController) waitStoreSync(ctx context.Context) error {
-	minVersion := cc.state.MinStoreDBVersion
+	target := cc.state.MinStoreVersion
-	if minVersion == 0 {
+	if len(target) == 0 {
-		return
+		return nil
 	}
 
-	slog.Info("Waiting for the initial cluster store sync.", "min_version", minVersion)
+	slog.Info("Waiting for the initial cluster store sync.", "actors", len(target))
 
 	ticker := time.NewTicker(500 * time.Millisecond)
 	defer ticker.Stop()
+	// Periodic warning to surface stuck NAT/connectivity issues without aborting.
+	warnInterval := 5 * time.Minute
+	warnTimer := time.NewTimer(warnInterval)
+	defer warnTimer.Stop()
 
 	var (
-		lastVersion    int64
+		lastLagging    int
-		lastLogTime    time.Time
 		lastErrLogTime time.Time
 	)
 
 	for {
 		select {
 		case <-ctx.Done():
-			return
+			return nil
+		case <-warnTimer.C:
+			local, err := cc.store.Version(ctx)
+			if err == nil {
+				slog.Error("Cluster store sync still pending. Check connectivity to peers.",
+					"lagging_actors", laggingActors(local, target))
+			} else {
+				slog.Error("Cluster store sync still pending. Check connectivity to peers.", "err", err)
+			}
+			warnTimer.Reset(warnInterval)
 		case <-ticker.C:
-			version, err := cc.store.DBVersion(ctx)
+			local, err := cc.store.Version(ctx)
 			if err != nil {
-				// Log errors at most once every 5 seconds.
+				// Throttle error logs to once every 5 seconds.
 				if time.Since(lastErrLogTime) >= 5*time.Second {
-					slog.Error("Failed to get the cluster store DB version, retrying.", "err", err)
+					slog.Error("Failed to get the cluster store version, retrying.", "err", err)
 					lastErrLogTime = time.Now()
 				}
 				continue
 			}
 
-			if version >= minVersion {
+			lagging := laggingActors(local, target)
-				// Clear MinStoreDBVersion so next restart doesn't wait for sync.
+			if len(lagging) == 0 {
+				// Per-actor max doesn't imply contiguous apply: corrosion can buffer X:N before
+				// X:N-1 arrives and track the gap separately. Wait for any remaining gaps to be synced.
+				if err := cc.waitKnownMissingChanges(ctx); err != nil {
+					return fmt.Errorf("wait for known missing changes: %w", err)
+				}
+				// If the context was cancelled mid-gap-fill, don't persist a "synced" state.
+				if ctx.Err() != nil {
+					return nil
+				}
+
+				// Clear MinStoreVersion so next restart doesn't wait for sync.
 				cc.state.mu.Lock()
-				cc.state.MinStoreDBVersion = 0
+				cc.state.MinStoreVersion = nil
-				if err := cc.state.Save(); err != nil {
+				err = cc.state.Save()
-					slog.Error("Failed to save machine state after the initial cluster store sync.", "err", err)
-				}
 				cc.state.mu.Unlock()
-
+				if err != nil {
-				// Wait for all known missing changes to be synced before returning.
+					return fmt.Errorf("save machine state after the initial cluster store sync: %w", err)
-				// TODO: reevaluate if this is necessary after migrating to the latest Corrosion version:
-				//  https://github.com/psviderski/uncloud/issues/172
-				//  This works on the best effort basis as the missing changes may not be yet known when we start
-				//  checking it after reaching the minimum version.
-				//  Reaching the minimum version doesn't guarantee that the store is actually synced to
-				//  the state we observed on the source node. db_version is a machine-local Lamport clock.
-				//  When changes are received from a remote machine, the local db_version is set to
-				//  max(local_db_version, incoming_db_version) + 1 for each applied transaction. This means
-				//  the new machine's db_version can jump well past the source machine's db_version on the very
-				//  first batch of replicated changes, without having received all changes from all machines
-				//  in the cluster.
-				cc.waitKnownMissingChanges(ctx)
-
-				if ver, verErr := cc.store.DBVersion(ctx); verErr == nil {
-					version = ver
-				}
-				slog.Info("Cluster store completed the initial sync.", "version", version, "min_version", minVersion)
-
-				return
 				}
 
-			// Log progress only once a second.
+				slog.Info("Cluster store completed the initial sync.", "actors", len(target))
-			if version != lastVersion && time.Since(lastLogTime) >= 1*time.Second {
+				return nil
-				slog.Info("Syncing cluster store.", "version", version, "min_version", minVersion)
+			}
-				lastLogTime = time.Now()
+
-				lastVersion = version
+			if len(lagging) != lastLagging {
+				slog.Info("Syncing cluster store.", "lagging_actors", lagging)
+				lastLagging = len(lagging)
 			}
 		}
 	}
 }
 
+// laggingActors returns target actors whose local version is below the required value, as [have, need].
+func laggingActors(local, target map[string]int64) map[string][2]int64 {
+	lagging := make(map[string][2]int64)
+	for actor, need := range target {
+		if have := local[actor]; have < need {
+			lagging[actor] = [2]int64{have, need}
+		}
+	}
+	return lagging
+}
+
 // waitKnownMissingChanges polls the store until all known missing changes have been synced.
-func (cc *clusterController) waitKnownMissingChanges(ctx context.Context) {
+func (cc *clusterController) waitKnownMissingChanges(ctx context.Context) error {
 	ticker := time.NewTicker(1 * time.Second)
 	defer ticker.Stop()
 
 	for {
 		select {
 		case <-ctx.Done():
-			return
+			return nil
 		case <-ticker.C:
 			changes, err := cc.store.KnownMissingChanges(ctx)
 			if err != nil {
-				slog.Error("Failed to get known missing changes from the cluster store, skipping check.",
+				return fmt.Errorf("query known missing changes from cluster store: %w", err)
-					"err", err)
-				return
 			}
 
 			if len(changes) == 0 {
 				slog.Debug("All known missing changes have been synced to the cluster store.")
-				return
+				return nil
 			}
 
 			slog.Debug("Waiting for known missing changes to be synced to the cluster store.", "remaining",

internal/machine/machine.go

@@ -841,7 +841,7 @@ func (m *Machine) JoinCluster(_ context.Context, req *pb.JoinClusterRequest) (*e
 		PrivateKey:    m.state.Network.PrivateKey,
 		PublicKey:     m.state.Network.PublicKey,
 	}
-	m.state.MinStoreDBVersion = req.MinStoreDbVersion
+	m.state.MinStoreVersion = req.MinStoreVersion
 
 	// Build a peers config from other cluster machines.
 	m.state.Network.Peers = make([]network.PeerConfig, 0, len(req.OtherMachines))
@@ -928,9 +928,9 @@ func (m *Machine) Inspect(_ context.Context, _ *emptypb.Empty) (*pb.MachineInfo,
 }
 
 func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.InspectMachineResponse, error) {
-	dbVersion, err := m.store.DBVersion(ctx)
+	storeVersion, err := m.store.Version(ctx)
 	if err != nil {
-		return nil, status.Errorf(codes.Internal, "get database version of the cluster store: %v", err)
+		return nil, status.Errorf(codes.Internal, "get cluster store version: %v", err)
 	}
 
 	var rtts map[string]*pb.RTTStats
@@ -954,7 +954,7 @@ func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.Ins
 						PublicKey:    m.state.Network.PublicKey,
 					},
 				},
-				StoreDbVersion: dbVersion,
+				StoreVersion: storeVersion,
 				Rtts:         rtts,
 			},
 		},

internal/machine/state.go

@@ -24,9 +24,10 @@ type State struct {
 	Name string
 	// Network specifies the network configuration for this machine.
 	Network *network.Config
-	// MinStoreDBVersion is the latest database version of one of the existing cluster machines at the time this machine
+	// MinStoreVersion is the cluster store version this machine must reach before participating.
-	// joined the cluster. The machine should sync to at least this version before starting any cluster operations.
+	// Per-actor vector (Corrosion actor UUID → max applied db_version) captured from an existing
-	MinStoreDBVersion int64 `json:",omitempty"`
+	// member at join time. Cleared once reached.
+	MinStoreVersion map[string]int64 `json:",omitempty"`
 
 	// path is the file path config is read from and saved to.
 	path string

internal/machine/store/store.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"log/slog"
 
+	"github.com/google/uuid"
 	"github.com/psviderski/uncloud/internal/corrosion"
 	"github.com/psviderski/uncloud/internal/machine/api/pb"
 	"google.golang.org/protobuf/encoding/protojson"
@@ -57,23 +58,31 @@ func (s *Store) Delete(ctx context.Context, key string) error {
 	return err
 }
 
-// DBVersion returns the current cr-sqlite database version (Lamport timestamp).
+// Version returns the cluster store's per-actor version vector:
-func (s *Store) DBVersion(ctx context.Context) (int64, error) {
+// Corrosion actor ID (UUID string) → max received db_version for that actor.
-	rows, err := s.corro.QueryContext(ctx, "SELECT crsql_db_version()")
+func (s *Store) Version(ctx context.Context) (map[string]int64, error) {
+	rows, err := s.corro.QueryContext(ctx, "SELECT site_id, db_version FROM crsql_db_versions")
 	if err != nil {
-		return 0, fmt.Errorf("query crsql_db_version(): %w", err)
+		return nil, fmt.Errorf("query crsql_db_versions: %w", err)
 	}
 	defer rows.Close()
 
-	if !rows.Next() {
+	versions := make(map[string]int64)
-		return 0, fmt.Errorf("no result from crsql_db_version()")
+	for rows.Next() {
+		var (
+			siteID  []byte
+			version int64
+		)
+		if err = rows.Scan(&siteID, &version); err != nil {
+			return nil, fmt.Errorf("scan actor version: %w", err)
 		}
-
+		actor, err := uuid.FromBytes(siteID)
-	var version int64
+		if err != nil {
-	if err = rows.Scan(&version); err != nil {
+			return nil, fmt.Errorf("parse site_id as UUID: %w", err)
-		return 0, fmt.Errorf("scan db version: %w", err)
 		}
-	return version, nil
+		versions[actor.String()] = version
+	}
+	return versions, nil
 }
 
 type MissingChange struct {

internal/ucind/cluster.go

@@ -194,7 +194,7 @@ func (p *Provisioner) initCluster(ctx context.Context, machines []Machine) error
 		joinReq := &pb.JoinClusterRequest{
 			Machine:         addResp.Machine,
 			OtherMachines:   []*pb.MachineInfo{initResp.Machine},
-			MinStoreDbVersion: inspectResp.Machines[0].StoreDbVersion,
+			MinStoreVersion: inspectResp.Machines[0].StoreVersion,
 		}
 		if _, err = cli.JoinCluster(ctx, joinReq); err != nil {
 			return fmt.Errorf("join cluster: %w", err)