fix(chat): translate session replay cursors

session-stream-store.mjs

@@ -8,6 +8,17 @@ function safeJsonParse(value, fallback = null) {
   }
 }
 
+function mapEventRow(row) {
+  if (!row) return null;
+  return {
+    id: row.id,
+    eventType: row.event_type,
+    payload: safeJsonParse(row.payload_json, null),
+    upstreamEventId: row.upstream_event_id ?? null,
+    createdAt: Number(row.created_at),
+  };
+}
+
 export function createSessionStreamStore({ pool }) {
   if (!pool) {
     throw new Error('createSessionStreamStore requires pool');
@@ -52,9 +63,10 @@ export function createSessionStreamStore({ pool }) {
 
     let afterCreatedAt = null;
     let cursorMiss = false;
+    let cursorEvent = null;
     if (afterEventId) {
       const [cursorRows] = await pool.query(
-        `SELECT created_at
+        `SELECT id, event_type, payload_json, upstream_event_id, created_at
          FROM h5_session_stream_events
          WHERE id = ? AND agent_session_id = ? AND user_id = ?
          LIMIT 1`,
@@ -63,7 +75,8 @@ export function createSessionStreamStore({ pool }) {
       if (!cursorRows[0]) {
         cursorMiss = true;
       } else {
-        afterCreatedAt = Number(cursorRows[0].created_at);
+        cursorEvent = mapEventRow(cursorRows[0]);
+        afterCreatedAt = cursorEvent.createdAt;
       }
     }
 
@@ -85,14 +98,9 @@ export function createSessionStreamStore({ pool }) {
     );
 
     return {
-      events: rows.map((row) => ({
-        id: row.id,
-        eventType: row.event_type,
-        payload: safeJsonParse(row.payload_json, null),
-        upstreamEventId: row.upstream_event_id ?? null,
-        createdAt: Number(row.created_at),
-      })),
+      events: rows.map(mapEventRow),
       cursorMiss,
+      cursorEvent,
     };
   }
 
@@ -107,13 +115,7 @@ export function createSessionStreamStore({ pool }) {
     );
     const row = rows[0];
     if (!row) return null;
-    return {
-      id: row.id,
-      eventType: row.event_type,
-      payload: safeJsonParse(row.payload_json, null),
-      upstreamEventId: row.upstream_event_id ?? null,
-      createdAt: Number(row.created_at),
-    };
+    return mapEventRow(row);
   }
 
   return {