diff --git a/convex/liveChat.ts b/convex/liveChat.ts
index b68835e..8067631 100644
--- a/convex/liveChat.ts
+++ b/convex/liveChat.ts
@@ -902,48 +902,32 @@ export const fixLegacySessions = mutation({
   handler: async (ctx) => {
     const now = Date.now()
 
-    // Buscar TODAS as sessoes (nao so por index) para garantir que pegamos as problematicas
-    const allSessions = await ctx.db
-      .query("liveChatSessions")
-      .take(500)
+    // IDs problematicos conhecidos - sessoes sem lastAgentMessageAt
+    const knownProblematicIds = [
+      "pd71bvfbxx7th3npdj519hcf3s7xbe2j",
+    ]
 
     let fixed = 0
     let ended = 0
-    const problematic: string[] = []
+    const results: string[] = []
 
-    for (const session of allSessions) {
-      // Se sessao nao tem lastAgentMessageAt, adiciona o valor
-      if (session.lastAgentMessageAt === undefined) {
-        problematic.push(session._id)
-
-        if (session.status === "ACTIVE") {
-          // Sessao ativa muito antiga (mais de 24h) - encerrar
-          if (now - session.startedAt > 24 * 60 * 60 * 1000) {
-            await ctx.db.patch(session._id, {
-              status: "ENDED",
-              endedAt: now,
-              lastAgentMessageAt: session.lastActivityAt ?? session.startedAt,
-            })
-            ended++
-          } else {
-            // Sessao recente - apenas corrigir o campo
-            await ctx.db.patch(session._id, {
-              lastAgentMessageAt: session.lastActivityAt ?? session.startedAt,
-            })
-            fixed++
-          }
-        } else {
-          // Sessao ja encerrada - apenas adicionar o campo
-          await ctx.db.patch(session._id, {
-            lastAgentMessageAt: session.lastActivityAt ?? session.startedAt,
-          })
-          fixed++
-        }
+    for (const sessionId of knownProblematicIds) {
+      try {
+        // Usar patch diretamente sem buscar a sessao (evita erro de shape)
+        await ctx.db.patch(sessionId as Id<"liveChatSessions">, {
+          status: "ENDED",
+          endedAt: now,
+          lastAgentMessageAt: now,
+        })
+        ended++
+        results.push(`${sessionId}: ended`)
+      } catch (error) {
+        results.push(`${sessionId}: error - ${error}`)
       }
     }
 
-    console.log(`fixLegacySessions: fixed=${fixed}, ended=${ended}, problematic=${problematic.join(",")}`)
-    return { fixed, ended, total: allSessions.length, problematic }
+    console.log(`fixLegacySessions: fixed=${fixed}, ended=${ended}, results=${results.join(", ")}`)
+    return { fixed, ended, results }
   },
 })