diff --git a/server/src/llm/eventMemoryService.ts b/server/src/llm/eventMemoryService.ts
index ca68a35..076be50 100644
--- a/server/src/llm/eventMemoryService.ts
+++ b/server/src/llm/eventMemoryService.ts
@@ -6,7 +6,7 @@ export interface EventMemoryService {
   getRecentEvents(entityId: EntityId, count: number): MemoryEvent[];
   selectForPrompt(entityId: EntityId, opts: {
     maxCount: number;
-    preferTypes?: MemoryEventType[];
+    preferTypes?: readonly MemoryEventType[];
     preferEntityId?: EntityId;
   }): MemoryEvent[];
   onEventRecorded: ((entityId: EntityId, event: MemoryEvent) => void) | null;
@@ -29,9 +29,12 @@ export function createEventMemoryService(maxEvents = 50): EventMemoryService {
     onEventRecorded: null,
 
     record(entityId: EntityId, eventData: Omit<MemoryEvent, 'id'>): MemoryEvent {
+      const id = nextId++;
       const event: MemoryEvent = {
-        id: nextId++,
+        id,
         ...eventData,
+        // Use auto-incrementing id as tick proxy when caller passes 0
+        tick: eventData.tick || id,
       };
 
       const buf = getBuffer(entityId);
diff --git a/server/src/systems/thoughtSystem.ts b/server/src/systems/thoughtSystem.ts
index fcd4879..5a01791 100644
--- a/server/src/systems/thoughtSystem.ts
+++ b/server/src/systems/thoughtSystem.ts
@@ -166,7 +166,7 @@ function describeRecentEvents(
 
     const events = eventMemoryService.selectForPrompt(entityId, {
       maxCount: 5,
-      preferTypes: preferTypes as any,
+      preferTypes,
     });
     if (events.length > 0) {
       return events.map(e => `- ${e.detail}`).join('\n');