diff --git a/src/core/services/immersion-tracker/lifetime.ts b/src/core/services/immersion-tracker/lifetime.ts
index 004fca52..2f3abf99 100644
--- a/src/core/services/immersion-tracker/lifetime.ts
+++ b/src/core/services/immersion-tracker/lifetime.ts
@@ -175,7 +175,7 @@ function rebuildLifetimeSummariesInternal(
 
   return {
     appliedSessions: sessions.length,
-    rebuiltAtMs,
+    rebuiltAtMs: Number(rebuiltAtMs),
   };
 }
 
diff --git a/src/core/services/immersion-tracker/maintenance.ts b/src/core/services/immersion-tracker/maintenance.ts
index ca3ec504..69e144e0 100644
--- a/src/core/services/immersion-tracker/maintenance.ts
+++ b/src/core/services/immersion-tracker/maintenance.ts
@@ -120,7 +120,7 @@ function getLastRollupSampleMs(db: DatabaseSync): number {
   return row ? Number(row.state_value) : ZERO_ID;
 }
 
-function setLastRollupSampleMs(db: DatabaseSync, sampleMs: number | bigint): void {
+function setLastRollupSampleMs(db: DatabaseSync, sampleMs: string | number | bigint): void {
   db.prepare(
     `INSERT INTO imm_rollup_state (state_key, state_value)
        VALUES (?, ?)
diff --git a/src/core/services/immersion-tracker/session.ts b/src/core/services/immersion-tracker/session.ts
index b0484f65..711fb1ba 100644
--- a/src/core/services/immersion-tracker/session.ts
+++ b/src/core/services/immersion-tracker/session.ts
@@ -40,7 +40,7 @@ export function startSessionRecord(
 export function finalizeSessionRecord(
   db: DatabaseSync,
   sessionState: SessionState,
-  endedAtMs = nowMs(),
+  endedAtMs: number | string = nowMs(),
 ): void {
   db.prepare(
     `
diff --git a/src/core/services/stats-server.ts b/src/core/services/stats-server.ts
index f54265c8..aa3696ff 100644
--- a/src/core/services/stats-server.ts
+++ b/src/core/services/stats-server.ts
@@ -1049,7 +1049,10 @@ export function startStatsServer(config: StatsServerConfig): { close: () => void
       }
     }
 
-    const body = req.method === 'GET' || req.method === 'HEAD' ? undefined : Readable.toWeb(req);
+    const body =
+      req.method === 'GET' || req.method === 'HEAD'
+        ? undefined
+        : (Readable.toWeb(req) as unknown as BodyInit);
 
     const response = await app.fetch(
       new Request(url.toString(), {