fix: use transport activity for stale health

src/channels/account-snapshot-fields.test.ts

@@ -34,4 +34,16 @@ describe("projectSafeChannelAccountSnapshotFields", () => {
       baseUrl: "https://chat.example.test/",
     });
   });
+
+  it("preserves non-secret transport liveness timestamps", () => {
+    const snapshot = projectSafeChannelAccountSnapshotFields({
+      lastInboundAt: 123,
+      lastTransportActivityAt: 456,
+    });
+
+    expect(snapshot).toEqual({
+      lastInboundAt: 123,
+      lastTransportActivityAt: 456,
+    });
+  });
 });

src/channels/account-snapshot-fields.ts

@@ -186,6 +186,9 @@ export function projectSafeChannelAccountSnapshotFields(
     ...(readNumber(record, "lastInboundAt") !== undefined
       ? { lastInboundAt: readNumber(record, "lastInboundAt") }
       : {}),
+    ...(readNumber(record, "lastTransportActivityAt") !== undefined
+      ? { lastTransportActivityAt: readNumber(record, "lastTransportActivityAt") }
+      : {}),
     ...(healthState ? { healthState } : {}),
     ...(mode ? { mode } : {}),
     ...(dmPolicy ? { dmPolicy } : {}),

src/channels/plugins/types.adapters.ts

@@ -172,9 +172,6 @@ export type ChannelGroupAdapter = {
 
 export type ChannelStatusAdapter<ResolvedAccount, Probe = unknown, Audit = unknown> = {
   defaultRuntime?: ChannelAccountSnapshot;
-  skipStaleSocketHealthCheck?: boolean;
-  /** Runtime `mode` values where `lastEventAt` can prove connected socket liveness. */
-  staleSocketHealthCheckModes?: readonly string[];
   buildChannelSummary?: BivariantCallback<
     (params: {
       account: ResolvedAccount;

src/channels/plugins/types.core.ts

@@ -199,6 +199,7 @@ export type ChannelAccountSnapshot = {
     | null;
   lastMessageAt?: number | null;
   lastEventAt?: number | null;
+  lastTransportActivityAt?: number | null;
   lastError?: string | null;
   healthState?: string;
   lastStartAt?: number | null;