fix(convex): corrigir memory leak com .collect() sem limite e adicionar otimizacoes

Problema: Convex backend consumindo 16GB+ de RAM causando OOM kills

Correcoes aplicadas:
- Substituido todos os .collect() por .take(LIMIT) em 27+ arquivos
- Adicionado indice by_usbPolicyStatus para otimizar query de maquinas
- Corrigido N+1 problem em alerts.ts usando Map lookup
- Corrigido full table scan em usbPolicy.ts
- Corrigido subscription leaks no frontend (tickets-view, use-ticket-categories)
- Atualizado versao do Convex backend para precompiled-2025-12-04-cc6af4c

Arquivos principais modificados:
- convex/*.ts - limites em todas as queries .collect()
- convex/schema.ts - novo indice by_usbPolicyStatus
- convex/alerts.ts - N+1 fix com Map
- convex/usbPolicy.ts - uso do novo indice
- src/components/tickets/tickets-view.tsx - skip condicional
- src/hooks/use-ticket-categories.ts - skip condicional

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

convex/reports.ts

@@ -509,9 +509,9 @@ async function forEachScopedTicketByResolvedRangeChunked(
           .order("desc");
 
     // Coleta tickets do chunk (o chunk ja e limitado por periodo)
-    const snapshot = await query.collect();
+    const snapshot = await query.take(1000);
     // Limita processamento a 1000 tickets por chunk para evitar timeout
-    const limitedSnapshot = snapshot.slice(0, 1000);
+    const limitedSnapshot = snapshot;
     for (const ticket of limitedSnapshot) {
       const resolvedAt = typeof ticket.resolvedAt === "number" ? ticket.resolvedAt : null;
       if (resolvedAt === null) continue;
@@ -535,11 +535,10 @@ export async function fetchOpenScopedTickets(
   // Limita a 500 tickets por status para evitar OOM
   const MAX_PER_STATUS = 500;
   for (const status of statuses) {
-    const allTickets = await ctx.db
+    const snapshot = await ctx.db
       .query("tickets")
       .withIndex("by_tenant_status", (q) => q.eq("tenantId", tenantId).eq("status", status))
-      .collect();
-    const snapshot = allTickets.slice(0, MAX_PER_STATUS);
+      .take(500);
     for (const ticket of snapshot) {
       if (!OPEN_STATUSES.has(normalizeStatus(ticket.status))) continue;
       if (scopedCompanyId && ticket.companyId !== scopedCompanyId) continue;
@@ -620,7 +619,7 @@ async function fetchCategoryMap(ctx: QueryCtx, tenantId: string) {
   const categories = await ctx.db
     .query("ticketCategories")
     .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-    .collect();
+    .take(500);
   const map = new Map<string, Doc<"ticketCategories">>();
   for (const category of categories) {
     map.set(String(category._id), category);
@@ -702,7 +701,7 @@ async function fetchQueues(ctx: QueryCtx, tenantId: string) {
   return ctx.db
     .query("queues")
     .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-    .collect();
+    .take(1000);
 }
 
 type CompanySummary = {
@@ -1023,7 +1022,7 @@ export async function csatOverviewHandler(
     const events = await ctx.db
       .query("ticketEvents")
       .withIndex("by_ticket", (q) => q.eq("ticketId", ticket._id))
-      .collect();
+      .take(1000);
 
     for (const event of events) {
       if (event.type !== "CSAT_RECEIVED" && event.type !== "CSAT_RATED") continue;
@@ -1420,11 +1419,10 @@ export async function agentProductivityHandler(
 
   for (const [agentId, acc] of map) {
     // Limita a 1000 sessoes por agente para evitar OOM
-    const allSessions = await ctx.db
+    const sessions = await ctx.db
       .query("ticketWorkSessions")
       .withIndex("by_agent", (q) => q.eq("agentId", agentId as Id<"users">))
-      .collect()
-    const sessions = allSessions.slice(0, 1000)
+      .take(1000)
     let total = 0
     for (const s of sessions) {
       const started = s.startedAt
@@ -1481,7 +1479,7 @@ export async function ticketCategoryInsightsHandler(
   const categories = await ctx.db
     .query("ticketCategories")
     .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-    .collect()
+    .take(500)
 
   const categoriesById = new Map<Id<"ticketCategories">, Doc<"ticketCategories">>()
   for (const category of categories) {