feat(clients): let admins set PersistentKeepalive on tunnel clients (#6377)

* feat(clients): let admins set PersistentKeepalive on tunnel clients

model.Client already carries KeepAlive, and every AmneziaWG/WireGuard client
config emitter already writes PersistentKeepalive when it is above zero -- but
nothing in the UI could set it, so it stayed 0 and the line was never emitted.

Without it a peer that goes quiet has nothing to trigger a handshake: WireGuard
only initiates when it has data to send. An idle client stays disconnected
after any interruption -- a NAT mapping timing out, a device sleeping, the
panel restarting -- until the user generates traffic themselves.

New clients default to 25, the conventional value, which also keeps the NAT
mapping open. Existing clients keep whatever they have, and 0 remains valid and
means "do not send keepalives".

* fix(clients): let an explicit 0 actually disable PersistentKeepalive

Addresses review feedback on the previous commit.

UpdateInboundClient carries a stored keepalive forward whenever the incoming
one is zero, so the settings JSON and the running peer survive a metadata-only
edit that omits the field. That was a 0 -> 0 no-op while no UI could set a
nonzero value. Now that the client form can, the carry-forward became reachable
in the other direction: a client created at the form's default of 25 could
never be returned to 0, and the hint text shipped to all 13 locales -- "0
disables it" -- described something the backend silently refused. The save even
reported success, because a settings blob that came back byte-identical skips
the transaction entirely.

The zero value cannot carry that distinction, so model.Client.KeepAlive becomes
*int: nil means the field was never sent, &0 means "send no keepalives". The
pointer survives the internal marshal in ClientService.Update, which is where an
explicit 0 was being erased by omitempty before UpdateInboundClient ever saw it.
ClientRecord.KeepAlive stays a plain int -- it is the stored column, where
"unset" has no meaning -- and the conversions bridge the two.

Two tests, both red before this change in the direction they cover: an explicit
0 must reach wg_keep_alive, and an update that omits the field must still leave
a stored 25 alone.

Also adds the output transform every other numeric field in the client form
already has, so a cleared box sends 0 rather than null.

* fix(clients): repair the keepalive pointer conversion after the main merge

Merging main brought buildAmneziaWGProxy (#6326) in beside the
Client.KeepAlive int -> *int change without reconciling the new call site,
so internal/sub stopped compiling and took every package importing it with
it. The two sides touched different lines, so git merged them without a
conflict -- the green `make verify` on 112b19a8 predates the break.

ToClient also wrapped a stored 0 in a pointer, so omitempty stopped
omitting: a VLESS client's settings JSON gained "keepAlive": 0 on the
attach and bulk-attach paths, and that JSON reaches xray-core verbatim
through GenXrayInboundConfig. wg_keep_alive cannot tell "off" from "never
set", so a stored 0 now stays nil.

Also copies the regenerated openapi.json over the docs mirror, which
nothing in CI checks, and trims two comment blocks to the two-line cap.

---------

Co-authored-by: Sanaei <[email protected]>

docs/public/openapi.json

@@ -1365,6 +1365,8 @@
             "type": "string"
           },
           "keepAlive": {
+            "description": "Seconds between PersistentKeepalive packets; 0 sends none, omit to keep the stored value",
+            "nullable": true,
             "type": "integer"
           },
           "limitIp": {

frontend/public/openapi.json

@@ -1365,6 +1365,8 @@
             "type": "string"
           },
           "keepAlive": {
+            "description": "Seconds between PersistentKeepalive packets; 0 sends none, omit to keep the stored value",
+            "nullable": true,
             "type": "integer"
           },
           "limitIp": {

frontend/src/generated/examples.ts

@@ -329,7 +329,7 @@ export const EXAMPLES: Record<string, unknown> = {
     "forwardedPorts": "",
     "group": "",
     "id": "",
-    "keepAlive": 0,
+    "keepAlive": null,
     "limitIp": 0,
     "password": "",
     "preSharedKey": "",

frontend/src/generated/schemas.ts

@@ -1339,6 +1339,8 @@ export const SCHEMAS: Record<string, unknown> = {
         "type": "string"
       },
       "keepAlive": {
+        "description": "Seconds between PersistentKeepalive packets; 0 sends none, omit to keep the stored value",
+        "nullable": true,
         "type": "integer"
       },
       "limitIp": {

frontend/src/generated/types.ts

@@ -325,7 +325,7 @@ export interface Client {
   forwardedPorts?: string;
   group?: string;
   id?: string;
-  keepAlive?: number;
+  keepAlive?: number | null;
   limitIp: number;
   password?: string;
   preSharedKey?: string;

frontend/src/generated/zod.ts

@@ -346,7 +346,7 @@ export const ClientSchema = z.object({
   forwardedPorts: z.string().optional(),
   group: z.string().optional(),
   id: z.string().optional(),
-  keepAlive: z.number().int().optional(),
+  keepAlive: z.number().int().nullable().optional(),
   limitIp: z.number().int(),
   password: z.string().optional(),
   preSharedKey: z.string().optional(),

frontend/src/pages/clients/ClientFormModal.tsx

@@ -133,6 +133,7 @@ type Values = ClientFormValues & {
   wgAllowedIPs: string;
   awgAllowedIPs: string;
   awgForwardedPorts: string;
+  wgKeepAlive: number;
   secret: string;
   adTag: string;
 };
@@ -169,6 +170,7 @@ const EMPTY: Values = {
   wgAllowedIPs: '',
   awgAllowedIPs: '',
   awgForwardedPorts: '',
+  wgKeepAlive: 25,
   secret: '',
   adTag: '',
 };
@@ -379,6 +381,7 @@ export default function ClientFormModal({
         wgAllowedIPs: wgTunnelIPs ?? client.allowedIPs ?? '',
         awgAllowedIPs: awgTunnelIPs ?? client.allowedIPs ?? '',
         awgForwardedPorts: client.forwardedPorts || '',
+        wgKeepAlive: client.keepAlive ?? 0,
         secret: client.secret || '',
         adTag: client.adTag || '',
       };
@@ -694,6 +697,7 @@ export default function ClientFormModal({
       // so both protocols share this one field set — see wgPrivateKey etc.
       // below and the AmneziaWG-labeled variants of the same inputs.
       clientPayload.privateKey = values.wgPrivateKey;
+      clientPayload.keepAlive = values.wgKeepAlive;
       clientPayload.publicKey = values.wgPublicKey;
       if (values.wgPreSharedKey) {
         clientPayload.preSharedKey = values.wgPreSharedKey;
@@ -1272,6 +1276,14 @@ export default function ClientFormModal({
                               <Input placeholder="10.8.1.2/32" />
                             </FormField>
                           )}
+                          <FormField
+                            name="wgKeepAlive"
+                            label={t('pages.clients.tunnelKeepAlive')}
+                            extra={t('pages.clients.tunnelKeepAliveHint')}
+                            transform={{ output: (v) => Number(v) || 0 }}
+                          >
+                            <InputNumber min={0} max={65535} style={{ width: '100%' }} />
+                          </FormField>
                           {showAmneziawg && (
                             <FormField
                               name="awgForwardedPorts"

internal/database/model/model.go

@@ -441,8 +441,8 @@ func WireguardPeerFromClient(c Client) map[string]any {
 	if c.PreSharedKey != "" {
 		peer["preSharedKey"] = c.PreSharedKey
 	}
-	if c.KeepAlive > 0 {
-		peer["keepAlive"] = c.KeepAlive
+	if ka := c.KeepAliveSeconds(); ka > 0 {
+		peer["keepAlive"] = ka
 	}
 	return peer
 }
@@ -890,7 +890,7 @@ type Client struct {
 	// before -- fully backward compatible for callers that never set this.
 	AllowedIPsByInbound map[int][]string `json:"allowedIPsByInbound,omitempty"`
 	PreSharedKey        string           `json:"preSharedKey,omitempty"`
-	KeepAlive           int              `json:"keepAlive,omitempty"`
+	KeepAlive           *int             `json:"keepAlive,omitempty"`      // Seconds between PersistentKeepalive packets; 0 sends none, omit to keep the stored value
 	ForwardedPorts      string           `json:"forwardedPorts,omitempty"` // AmneziaWG per-client port-forwarding spec, e.g. "80,443,8000-8100"
 	Secret              string           `json:"secret,omitempty" example:"ee1234567890abcdef1234567890abcd7777772e636c6f7564666c6172652e636f6d"`
 	AdTag               string           `json:"adTag,omitempty" example:"0123456789abcdef0123456789abcdef"`
@@ -1113,6 +1113,27 @@ type Host struct {
 
 func (Host) TableName() string { return "hosts" }
 
+// KeepAliveSeconds is the client's PersistentKeepalive, 0 when unset.
+func (c Client) KeepAliveSeconds() int {
+	if c.KeepAlive == nil {
+		return 0
+	}
+	return *c.KeepAlive
+}
+
+// KeepAlivePtr wraps an explicit PersistentKeepalive, 0 included -- distinct
+// from a nil KeepAlive, which means the field was never sent.
+func KeepAlivePtr(v int) *int { return &v }
+
+// nonZeroKeepAlive keeps a stored 0 nil: wg_keep_alive cannot tell "off" from
+// "never set", and an explicit 0 would emit keepAlive on every protocol.
+func nonZeroKeepAlive(seconds int) *int {
+	if seconds <= 0 {
+		return nil
+	}
+	return KeepAlivePtr(seconds)
+}
+
 func (c *Client) ToRecord() *ClientRecord {
 	rec := &ClientRecord{
 		Email:           c.Email,
@@ -1141,7 +1162,7 @@ func (c *Client) ToRecord() *ClientRecord {
 		PublicKey:      c.PublicKey,
 		AllowedIPs:     strings.Join(c.AllowedIPs, ","),
 		PreSharedKey:   c.PreSharedKey,
-		KeepAlive:      c.KeepAlive,
+		KeepAlive:      c.KeepAliveSeconds(),
 		ForwardedPorts: c.ForwardedPorts,
 		Secret:         c.Secret,
 		AdTag:          c.AdTag,
@@ -1199,7 +1220,7 @@ func (r *ClientRecord) ToClient() *Client {
 		PublicKey:      r.PublicKey,
 		AllowedIPs:     splitWireguardAllowedIPs(r.AllowedIPs),
 		PreSharedKey:   r.PreSharedKey,
-		KeepAlive:      r.KeepAlive,
+		KeepAlive:      nonZeroKeepAlive(r.KeepAlive),
 		ForwardedPorts: r.ForwardedPorts,
 		Secret:         r.Secret,
 		AdTag:          r.AdTag,

internal/database/model/model_wireguard_test.go

@@ -1,7 +1,9 @@
 package model
 
 import (
+	"encoding/json"
 	"reflect"
+	"strings"
 	"testing"
 )
 
@@ -13,7 +15,7 @@ func TestClientToRecordRoundTripWireGuard(t *testing.T) {
 		PublicKey:    "cGVlci1wdWJsaWMta2V5LWJhc2U2NC0zMmJ5dGVzISE=",
 		AllowedIPs:   []string{"10.0.0.2/32", "fd00::2/128"},
 		PreSharedKey: "cHNrLWJhc2U2NC0zMmJ5dGVzLXBsYWNlaG9sZGVyISE=",
-		KeepAlive:    25,
+		KeepAlive:    KeepAlivePtr(25),
 	}
 
 	rec := c.ToRecord()
@@ -29,7 +31,7 @@ func TestClientToRecordRoundTripWireGuard(t *testing.T) {
 		{"PrivateKey", c.PrivateKey, got.PrivateKey},
 		{"PublicKey", c.PublicKey, got.PublicKey},
 		{"PreSharedKey", c.PreSharedKey, got.PreSharedKey},
-		{"KeepAlive", c.KeepAlive, got.KeepAlive},
+		{"KeepAlive", c.KeepAliveSeconds(), got.KeepAliveSeconds()},
 	} {
 		if f.a != f.b {
 			t.Errorf("%s round-trip = %v, want %v", f.name, f.b, f.a)
@@ -40,6 +42,23 @@ func TestClientToRecordRoundTripWireGuard(t *testing.T) {
 	}
 }
 
+// ToClient feeds the settings JSON of every protocol, not just the tunnels, and
+// that JSON reaches xray-core verbatim through GenXrayInboundConfig.
+func TestClientToClientOmitsUnsetKeepAlive(t *testing.T) {
+	rec := &ClientRecord{Email: "[email protected]", UUID: "11111111-2222-3333-4444-555555555555", Enable: true}
+
+	if got := rec.ToClient().KeepAlive; got != nil {
+		t.Fatalf("KeepAlive for a record that never set one = %d, want nil", *got)
+	}
+	blob, err := json.Marshal(map[string][]Client{"clients": {*rec.ToClient()}})
+	if err != nil {
+		t.Fatalf("marshal settings payload: %v", err)
+	}
+	if strings.Contains(string(blob), "keepAlive") {
+		t.Fatalf("settings payload carries keepAlive for a non-tunnel client: %s", blob)
+	}
+}
+
 func TestClientRecordEmptyAllowedIPs(t *testing.T) {
 	rec := &ClientRecord{Email: "[email protected]", AllowedIPs: ""}
 	if got := rec.ToClient().AllowedIPs; got != nil {

internal/sub/clash_service.go

@@ -579,8 +579,8 @@ func (s *SubClashService) buildWireguardProxy(subReq *SubService, inbound *model
 	if client.PreSharedKey != "" {
 		proxy["pre-shared-key"] = client.PreSharedKey
 	}
-	if client.KeepAlive > 0 {
-		proxy["persistent-keepalive"] = client.KeepAlive
+	if ka := client.KeepAliveSeconds(); ka > 0 {
+		proxy["persistent-keepalive"] = ka
 	}
 	for _, addr := range client.AllowedIPs {
 		ip := stripCIDR(addr)
@@ -667,8 +667,8 @@ func (s *SubClashService) buildAmneziaWGProxy(subReq *SubService, inbound *model
 	if client.PreSharedKey != "" {
 		proxy["pre-shared-key"] = client.PreSharedKey
 	}
-	if client.KeepAlive > 0 {
-		proxy["persistent-keepalive"] = client.KeepAlive
+	if ka := client.KeepAliveSeconds(); ka > 0 {
+		proxy["persistent-keepalive"] = ka
 	}
 
 	for _, addr := range amneziaWGClientAddresses(parsed.Clients, client) {

internal/sub/clash_service_test.go

@@ -909,7 +909,7 @@ func TestBuildWireguardProxyForClash(t *testing.T) {
 		Email:        "user",
 		PrivateKey:   clientPriv,
 		PreSharedKey: "psk-value",
-		KeepAlive:    25,
+		KeepAlive:    model.KeepAlivePtr(25),
 		AllowedIPs:   []string{"10.0.0.2/32", "fd00::2/128"},
 	}
 
@@ -989,7 +989,7 @@ func TestBuildAmneziaWGProxyForClash(t *testing.T) {
 		Email:        "user",
 		PrivateKey:   clientPriv,
 		PreSharedKey: "psk-value",
-		KeepAlive:    25,
+		KeepAlive:    model.KeepAlivePtr(25),
 		AllowedIPs:   []string{"10.8.1.2/32", "fd00::2/128"},
 	}
 

internal/sub/json_service.go

@@ -998,8 +998,8 @@ func (s *SubJsonService) genWireguard(inbound *model.Inbound, client model.Clien
 	if client.PreSharedKey != "" {
 		peer["preSharedKey"] = client.PreSharedKey
 	}
-	if client.KeepAlive > 0 {
-		peer["keepAlive"] = client.KeepAlive
+	if ka := client.KeepAliveSeconds(); ka > 0 {
+		peer["keepAlive"] = ka
 	}
 
 	settings := map[string]any{

internal/sub/json_service_test.go

@@ -462,7 +462,7 @@ func TestSubJsonServiceWireguard(t *testing.T) {
 		Email:        "user",
 		PrivateKey:   clientPriv,
 		PreSharedKey: "psk-value",
-		KeepAlive:    25,
+		KeepAlive:    model.KeepAlivePtr(25),
 		AllowedIPs:   []string{"10.0.0.2/32", "fd00::2/128"},
 	}
 

internal/sub/service.go

@@ -776,8 +776,8 @@ func (s *SubService) genWireguardLink(inbound *model.Inbound, email string) stri
 	if client.PreSharedKey != "" {
 		params["presharedkey"] = client.PreSharedKey
 	}
-	if client.KeepAlive > 0 {
-		params["keepalive"] = strconv.Itoa(client.KeepAlive)
+	if ka := client.KeepAliveSeconds(); ka > 0 {
+		params["keepalive"] = strconv.Itoa(ka)
 	}
 	return buildLinkWithParams(link, params, s.genRemark(inbound, email, "", ""))
 }
@@ -878,8 +878,8 @@ func amneziaWGConfigText(server *amneziawg.ServerSettings, client *model.Client,
 	}
 	b.WriteString("AllowedIPs = 0.0.0.0/0, ::/0\n")
 	fmt.Fprintf(&b, "Endpoint = %s:%d", host, port)
-	if client.KeepAlive > 0 {
-		fmt.Fprintf(&b, "\nPersistentKeepalive = %d", client.KeepAlive)
+	if ka := client.KeepAliveSeconds(); ka > 0 {
+		fmt.Fprintf(&b, "\nPersistentKeepalive = %d", ka)
 	}
 
 	return b.String()

internal/sub/service_amneziawg_test.go

@@ -215,7 +215,7 @@ func TestAmneziaWGConfigTextPeerFieldOrder(t *testing.T) {
 	server := &amneziawg.ServerSettings{PublicKey: "serverPub", PrimaryDNS: "8.8.8.8", MTU: 1420}
 
 	t.Run("every optional field set", func(t *testing.T) {
-		client := &model.Client{PrivateKey: "clientPriv", AllowedIPs: []string{"10.8.1.2/32"}, PreSharedKey: "psk", KeepAlive: 25}
+		client := &model.Client{PrivateKey: "clientPriv", AllowedIPs: []string{"10.8.1.2/32"}, PreSharedKey: "psk", KeepAlive: model.KeepAlivePtr(25)}
 		conf := amneziaWGConfigText(server, client, "203.0.113.7", 51820, "remark")
 		if got := peerFields(t, conf); !slices.Equal(got, peerFieldOrder) {
 			t.Fatalf("peer fields = %v, want %v\n%s", got, peerFieldOrder, conf)

internal/web/runtime/local.go

@@ -242,7 +242,7 @@ func (l *Local) AddClient(ctx context.Context, ib *model.Inbound, client model.C
 		"publicKey":    client.PublicKey,
 		"allowedIPs":   client.AllowedIPs,
 		"preSharedKey": client.PreSharedKey,
-		"keepAlive":    wgKeepAlive(client.KeepAlive),
+		"keepAlive":    wgKeepAlive(client.KeepAliveSeconds()),
 	}
 	return l.AddUser(ctx, ib, user)
 }
@@ -283,7 +283,7 @@ func (l *Local) UpdateUser(ctx context.Context, ib *model.Inbound, oldEmail stri
 		"publicKey":    payload.PublicKey,
 		"allowedIPs":   payload.AllowedIPs,
 		"preSharedKey": payload.PreSharedKey,
-		"keepAlive":    wgKeepAlive(payload.KeepAlive),
+		"keepAlive":    wgKeepAlive(payload.KeepAliveSeconds()),
 	}
 	return l.AddUser(ctx, ib, user)
 }

internal/web/service/client_inbound_apply.go

@@ -587,7 +587,7 @@ func (s *ClientService) AddInboundClient(inboundSvc *InboundService, data *model
 					"publicKey":    client.PublicKey,
 					"allowedIPs":   client.AllowedIPs,
 					"preSharedKey": client.PreSharedKey,
-					"keepAlive":    keepAliveStr(client.KeepAlive),
+					"keepAlive":    keepAliveStr(client.KeepAliveSeconds()),
 				})
 				if err1 == nil {
 					logger.Debug("Client added on", rt.Name(), ":", client.Email)
@@ -734,7 +734,7 @@ func (s *ClientService) UpdateInboundClient(inboundSvc *InboundService, data *mo
 		if clients[0].PreSharedKey == "" {
 			clients[0].PreSharedKey = old.PreSharedKey
 		}
-		if clients[0].KeepAlive == 0 {
+		if clients[0].KeepAlive == nil {
 			clients[0].KeepAlive = old.KeepAlive
 		}
 		// ForwardedPorts is AmneziaWG-only (WireGuard's own inbound never
@@ -801,8 +801,8 @@ func (s *ClientService) UpdateInboundClient(inboundSvc *InboundService, data *mo
 				if clients[0].PreSharedKey != "" {
 					newMap["preSharedKey"] = clients[0].PreSharedKey
 				}
-				if clients[0].KeepAlive > 0 {
-					newMap["keepAlive"] = clients[0].KeepAlive
+				if ka := clients[0].KeepAliveSeconds(); ka > 0 {
+					newMap["keepAlive"] = ka
 				}
 				if oldInbound.Protocol == model.AmneziaWG && clients[0].ForwardedPorts != "" {
 					newMap["forwardedPorts"] = clients[0].ForwardedPorts
@@ -1014,7 +1014,7 @@ func (s *ClientService) UpdateInboundClient(inboundSvc *InboundService, data *mo
 						"publicKey":    clients[0].PublicKey,
 						"allowedIPs":   clients[0].AllowedIPs,
 						"preSharedKey": clients[0].PreSharedKey,
-						"keepAlive":    keepAliveStr(clients[0].KeepAlive),
+						"keepAlive":    keepAliveStr(clients[0].KeepAliveSeconds()),
 					})
 					if err1 == nil {
 						logger.Debug("Client edited on", rt.Name(), ":", clients[0].Email)

internal/web/service/client_update_keepalive_test.go

@@ -0,0 +1,102 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/database/model"
+)
+
+func inboundKeepAlive(t *testing.T, inboundSvc *InboundService, ibId int, email string) int {
+	t.Helper()
+	ib, err := inboundSvc.GetInbound(ibId)
+	if err != nil {
+		t.Fatalf("GetInbound %d: %v", ibId, err)
+	}
+	clients, err := inboundSvc.GetClients(ib)
+	if err != nil {
+		t.Fatalf("GetClients %d: %v", ibId, err)
+	}
+	for i := range clients {
+		if clients[i].Email == email {
+			return clients[i].KeepAliveSeconds()
+		}
+	}
+	t.Fatalf("email %q not found on inbound %d", email, ibId)
+	return 0
+}
+
+// seedKeepAliveClient attaches one WireGuard client already carrying a
+// PersistentKeepalive, and returns its inbound and client-record id.
+func seedKeepAliveClient(t *testing.T, email string, keepAlive int) (*model.Inbound, int) {
+	t.Helper()
+	svc := &ClientService{}
+
+	seeded := model.Client{
+		Email:      email,
+		SubID:      "sub-" + email,
+		Enable:     true,
+		AllowedIPs: []string{"10.0.0.5/32"},
+		KeepAlive:  model.KeepAlivePtr(keepAlive),
+	}
+	ib := mkInbound(t, 51820, model.WireGuard, clientsSettings(t, []model.Client{seeded}))
+	if err := svc.SyncInbound(nil, ib.Id, []model.Client{seeded}); err != nil {
+		t.Fatalf("seed linkage: %v", err)
+	}
+	return ib, lookupClientRecord(t, email).Id
+}
+
+// Carrying forward on a zero incoming keepalive was a 0 -> 0 no-op while no UI
+// could set the field; once the client form could, "0 disables it" was unreachable.
+func TestUpdateCanClearKeepAliveOnAnExistingClient(t *testing.T) {
+	setupBulkDB(t)
+	inboundSvc := &InboundService{}
+	svc := &ClientService{}
+
+	ib, recId := seedKeepAliveClient(t, "ka@x", 25)
+	if got := inboundKeepAlive(t, inboundSvc, ib.Id, "ka@x"); got != 25 {
+		t.Fatalf("seeded keepAlive = %d, want 25", got)
+	}
+
+	updated := model.Client{
+		Email:      "ka@x",
+		Enable:     true,
+		AllowedIPs: []string{"10.0.0.5/32"},
+		KeepAlive:  model.KeepAlivePtr(0),
+	}
+	if _, err := svc.Update(inboundSvc, recId, updated, 0); err != nil {
+		t.Fatalf("Update: %v", err)
+	}
+
+	if got := inboundKeepAlive(t, inboundSvc, ib.Id, "ka@x"); got != 0 {
+		t.Fatalf("inbound keepAlive after an explicit 0 = %d, want 0", got)
+	}
+	if got := lookupClientRecord(t, "ka@x").KeepAlive; got != 0 {
+		t.Fatalf("stored wg_keep_alive after an explicit 0 = %d, want 0", got)
+	}
+}
+
+// The other half of the contract: a payload that never mentions keepAlive (a
+// metadata-only edit from the bot or the API) leaves the stored value alone.
+func TestUpdateWithoutKeepAlivePreservesTheStoredValue(t *testing.T) {
+	setupBulkDB(t)
+	inboundSvc := &InboundService{}
+	svc := &ClientService{}
+
+	ib, recId := seedKeepAliveClient(t, "ka@x", 25)
+
+	updated := model.Client{
+		Email:      "ka@x",
+		Enable:     true,
+		AllowedIPs: []string{"10.0.0.5/32"},
+	}
+	if _, err := svc.Update(inboundSvc, recId, updated, 0); err != nil {
+		t.Fatalf("Update: %v", err)
+	}
+
+	if got := inboundKeepAlive(t, inboundSvc, ib.Id, "ka@x"); got != 25 {
+		t.Fatalf("inbound keepAlive after an edit that omitted it = %d, want 25", got)
+	}
+	if got := lookupClientRecord(t, "ka@x").KeepAlive; got != 25 {
+		t.Fatalf("stored wg_keep_alive after an edit that omitted it = %d, want 25", got)
+	}
+}

internal/web/service/client_wireguard.go

@@ -249,8 +249,8 @@ func defaultWireguardClients(settingsJSON string, existing, clients []model.Clie
 				if c.PreSharedKey != "" {
 					m["preSharedKey"] = c.PreSharedKey
 				}
-				if c.KeepAlive > 0 {
-					m["keepAlive"] = c.KeepAlive
+				if ka := c.KeepAliveSeconds(); ka > 0 {
+					m["keepAlive"] = ka
 				}
 				interfaceClients[i] = m
 			}

internal/web/service/xray_wireguard_config_test.go

@@ -130,7 +130,7 @@ func wgPeerList(t *testing.T, settings map[string]any) []map[string]any {
 
 func TestGetXrayConfigWireGuardPeers(t *testing.T) {
 	clients := []model.Client{
-		{Email: "[email protected]", Enable: true, PublicKey: "pub-alice", AllowedIPs: []string{"10.0.0.2/32"}, KeepAlive: 25},
+		{Email: "[email protected]", Enable: true, PublicKey: "pub-alice", AllowedIPs: []string{"10.0.0.2/32"}, KeepAlive: model.KeepAlivePtr(25)},
 		{Email: "[email protected]", Enable: true, PublicKey: "pub-bob", AllowedIPs: []string{"10.0.0.3/32"}},
 	}
 	seedWGInbound(t, "wg-multi", 51820, clients)

internal/web/translation/ar-EG.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "اتركه فارغًا للتعيين التلقائي؛ افصل بين الإدخالات بفواصل",
       "amneziaWgForwardedPorts": "المنافذ المُعاد توجيهها",
       "amneziaWgForwardedPortsHint": "المنافذ/النطاقات المُعاد توجيهها (DNAT) لهذا العميل، مثل 80, 443, 8000-8100. اتركها فارغة إن لم تكن مطلوبة.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "إعدادات AmneziaWG",
       "mtprotoSecret": "سر MTProto",
       "mtprotoSecretHint": "سر FakeTLS الخاص بالعميل. أعد التوليد لتغييره.",

internal/web/translation/en-US.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Leave empty to auto-assign; separate entries with commas",
       "amneziaWgForwardedPorts": "Forwarded Ports",
       "amneziaWgForwardedPortsHint": "Ports/ranges DNAT'd to this client, e.g. 80, 443, 8000-8100. Leave empty for none.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "AmneziaWG config",
       "mtprotoSecret": "MTProto secret",
       "mtprotoSecretHint": "The client's FakeTLS secret. Regenerate to rotate it.",

internal/web/translation/es-ES.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Déjalo vacío para asignar automáticamente; separa las entradas con comas",
       "amneziaWgForwardedPorts": "Puertos reenviados",
       "amneziaWgForwardedPortsHint": "Puertos/rangos redirigidos (DNAT) a este cliente, p. ej. 80, 443, 8000-8100. Déjalo vacío si no aplica.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "Configuración de AmneziaWG",
       "mtprotoSecret": "Secreto MTProto",
       "mtprotoSecretHint": "El secreto FakeTLS del cliente. Vuelve a generarlo para cambiarlo.",

internal/web/translation/fa-IR.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "برای تخصیص خودکار خالی بگذارید؛ ورودی‌ها را با کاما جدا کنید",
       "amneziaWgForwardedPorts": "پورت‌های هدایت‌شده",
       "amneziaWgForwardedPortsHint": "پورت‌ها/محدوده‌های DNAT شده به این کلاینت، مثلاً 80, 443, 8000-8100. برای غیرفعال بودن خالی بگذارید.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "پیکربندی AmneziaWG",
       "mtprotoSecret": "سکرت MTProto",
       "mtprotoSecretHint": "سکرت FakeTLS این کلاینت. برای تعویض، دوباره تولید کنید.",

internal/web/translation/id-ID.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Biarkan kosong untuk penetapan otomatis; pisahkan entri dengan koma",
       "amneziaWgForwardedPorts": "Port yang Diteruskan",
       "amneziaWgForwardedPortsHint": "Port/rentang yang di-DNAT ke klien ini, mis. 80, 443, 8000-8100. Biarkan kosong jika tidak ada.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "Konfigurasi AmneziaWG",
       "mtprotoSecret": "Secret MTProto",
       "mtprotoSecretHint": "Secret FakeTLS klien. Buat ulang untuk menggantinya.",

internal/web/translation/ja-JP.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "空欄で自動割り当て。複数指定はカンマ区切り",
       "amneziaWgForwardedPorts": "転送ポート",
       "amneziaWgForwardedPortsHint": "このクライアントに転送するポート/範囲。例: 80, 443, 8000-8100。空欄で転送なし。",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "AmneziaWG 設定",
       "mtprotoSecret": "MTProto シークレット",
       "mtprotoSecretHint": "このクライアントの FakeTLS シークレット。変更するには再生成します。",

internal/web/translation/pt-BR.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Deixe vazio para atribuir automaticamente; separe as entradas com vírgulas",
       "amneziaWgForwardedPorts": "Portas encaminhadas",
       "amneziaWgForwardedPortsHint": "Portas/intervalos redirecionados (DNAT) para este cliente, ex. 80, 443, 8000-8100. Deixe vazio se não aplicável.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "Configuração do AmneziaWG",
       "mtprotoSecret": "Segredo MTProto",
       "mtprotoSecretHint": "O segredo FakeTLS do cliente. Gere novamente para trocá-lo.",

internal/web/translation/ru-RU.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Оставьте пустым для автоназначения; разделяйте записи запятыми",
       "amneziaWgForwardedPorts": "Проброс портов",
       "amneziaWgForwardedPortsHint": "Порты/диапазоны, DNAT'ящиеся на этого клиента, например 80, 443, 8000-8100. Оставьте пустым, если не нужно.",
+      "tunnelKeepAlive": "Keepalive (секунды)",
+      "tunnelKeepAliveHint": "Как часто клиент шлёт keepalive-пакет. Обычное значение 25: оно держит NAT-маппинг открытым и возвращает простаивающий пир сам после любого разрыва, включая рестарт панели. 0 отключает — тогда молчащий клиент остаётся отключённым до первого своего пакета.",
       "amneziaWgConfig": "Конфиг AmneziaWG",
       "mtprotoSecret": "Секрет MTProto",
       "mtprotoSecretHint": "Секрет FakeTLS клиента. Перегенерируйте, чтобы сменить.",

internal/web/translation/tr-TR.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Otomatik atama için boş bırakın; girişleri virgülle ayırın",
       "amneziaWgForwardedPorts": "Yönlendirilen Portlar",
       "amneziaWgForwardedPortsHint": "Bu istemciye DNAT ile yönlendirilen port/aralıklar, örn. 80, 443, 8000-8100. Yoksa boş bırakın.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "AmneziaWG Yapılandırması",
       "mtprotoSecret": "MTProto sırrı",
       "mtprotoSecretHint": "İstemcinin FakeTLS sırrı. Değiştirmek için yeniden oluşturun.",

internal/web/translation/uk-UA.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Залиште порожнім для автопризначення; розділяйте записи комами",
       "amneziaWgForwardedPorts": "Перенаправлені порти",
       "amneziaWgForwardedPortsHint": "Порти/діапазони, що перенаправляються (DNAT) на цього клієнта, напр. 80, 443, 8000-8100. Залиште порожнім, якщо не потрібно.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "Конфігурація AmneziaWG",
       "mtprotoSecret": "Секрет MTProto",
       "mtprotoSecretHint": "Секрет FakeTLS клієнта. Згенеруйте заново, щоб змінити.",

internal/web/translation/vi-VN.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "Để trống để tự động gán; phân tách các mục bằng dấu phẩy",
       "amneziaWgForwardedPorts": "Cổng chuyển tiếp",
       "amneziaWgForwardedPortsHint": "Cổng/dải cổng được chuyển tiếp (DNAT) đến client này, vd. 80, 443, 8000-8100. Để trống nếu không cần.",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "Cấu hình AmneziaWG",
       "mtprotoSecret": "Secret MTProto",
       "mtprotoSecretHint": "Secret FakeTLS của client. Tạo lại để thay đổi.",

internal/web/translation/zh-CN.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "留空则自动分配；多个条目用逗号分隔",
       "amneziaWgForwardedPorts": "转发端口",
       "amneziaWgForwardedPortsHint": "转发到此客户端的端口/范围，例如 80, 443, 8000-8100。留空则不转发。",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "AmneziaWG 配置",
       "mtprotoSecret": "MTProto 密钥",
       "mtprotoSecretHint": "该客户端的 FakeTLS 密钥。重新生成即可更换。",

internal/web/translation/zh-TW.json

@@ -879,6 +879,8 @@
       "amneziaWgAllowedIPsHint": "留空則自動分配；多個條目用逗號分隔",
       "amneziaWgForwardedPorts": "轉發連接埠",
       "amneziaWgForwardedPortsHint": "轉發到此客戶端的連接埠/範圍，例如 80, 443, 8000-8100。留空則不轉發。",
+      "tunnelKeepAlive": "Keepalive (seconds)",
+      "tunnelKeepAliveHint": "How often the client sends a keepalive packet. 25 is the usual value: it holds the NAT mapping open and brings an idle peer back on its own after any drop, including a panel restart. 0 disables it — an idle client then stays disconnected until it sends traffic.",
       "amneziaWgConfig": "AmneziaWG 設定",
       "mtprotoSecret": "MTProto 金鑰",
       "mtprotoSecretHint": "該用戶端的 FakeTLS 金鑰。重新產生即可更換。",