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/machines.ts

@@ -81,7 +81,7 @@ async function findActiveMachineToken(ctx: QueryCtx, machineId: Id<"machines">,
     .withIndex("by_machine_revoked_expires", (q) =>
       q.eq("machineId", machineId).eq("revoked", false).gt("expiresAt", now),
     )
-    .collect()
+    .take(100)
 
   return tokens.length > 0 ? tokens[0]! : null
 }
@@ -550,7 +550,7 @@ export const register = mutation({
       const candidates = await ctx.db
         .query("machines")
         .withIndex("by_tenant_hostname", (q) => q.eq("tenantId", tenantId).eq("hostname", args.hostname))
-        .collect()
+        .take(200)
       // Procura uma maquina com hostname igual E hardware compativel (MAC ou serial)
       for (const candidate of candidates) {
         if (matchesExistingHardware(candidate, identifiers, args.hostname)) {
@@ -643,7 +643,7 @@ export const register = mutation({
     const previousTokens = await ctx.db
       .query("machineTokens")
       .withIndex("by_machine", (q) => q.eq("machineId", machineId))
-      .collect()
+      .take(100)
 
     for (const token of previousTokens) {
       if (!token.revoked) {
@@ -932,7 +932,7 @@ export const listByTenant = query({
     const tenantCompanies = await ctx.db
       .query("companies")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect()
+      .take(200)
 
     const companyById = new Map<string, typeof tenantCompanies[number]>()
     const companyBySlug = new Map<string, typeof tenantCompanies[number]>()
@@ -1574,7 +1574,7 @@ export const listMachineRequesters = query({
     const tickets = await ctx.db
       .query("tickets")
       .withIndex("by_tenant_machine", (q) => q.eq("tenantId", machine.tenantId).eq("machineId", args.machineId))
-      .collect()
+      .take(200)
 
     const requestersMap = new Map<string, { email: string; name: string | null }>()
     for (const ticket of tickets) {
@@ -2131,7 +2131,7 @@ export const resetAgent = mutation({
     const tokens = await ctx.db
       .query("machineTokens")
       .withIndex("by_machine", (q) => q.eq("machineId", machineId))
-      .collect()
+      .take(100)
 
     const now = Date.now()
     let revokedCount = 0
@@ -2640,7 +2640,7 @@ export const remove = mutation({
     const tokens = await ctx.db
       .query("machineTokens")
       .withIndex("by_machine", (q) => q.eq("machineId", machineId))
-      .collect()
+      .take(100)
 
     await Promise.all(tokens.map((token) => ctx.db.delete(token._id)))
     await ctx.db.delete(machineId)