feat(proxy): add LiteLLM_BudgetWindowSpend table for per-window budget spend

Multi-window budgets (budget_limits on keys/teams) currently keep window
spend only in cache. Every cold or expired counter recomputes the window
by aggregating LiteLLM_SpendLogs, which has no usable index for that
query and saturates the DB on large tables (#35766).

This adds a LiteLLM_BudgetWindowSpend table holding one row per
configured window, keyed (entity_type, entity_id, window_duration),
with window_start identifying the period the spend belongs to.
Follow-up PRs maintain these rows from the spend update writer and move
window budget enforcement reads onto them.

litellm-proxy-extras/litellm_proxy_extras/migrations/20260804162853_add_budget_window_spend_table/migration.sql

@@ -0,0 +1,13 @@
+-- CreateTable
+CREATE TABLE IF NOT EXISTS "LiteLLM_BudgetWindowSpend" (
+    "entity_type" TEXT NOT NULL,
+    "entity_id" TEXT NOT NULL,
+    "window_duration" TEXT NOT NULL,
+    "window_start" TIMESTAMP(3) NOT NULL,
+    "spend" DOUBLE PRECISION NOT NULL DEFAULT 0.0,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "LiteLLM_BudgetWindowSpend_pkey" PRIMARY KEY ("entity_type","entity_id","window_duration")
+);
+

litellm-proxy-extras/litellm_proxy_extras/schema.prisma

@@ -664,6 +664,18 @@ model LiteLLM_SpendLogs {
   @@index([session_id])
 }
 
+model LiteLLM_BudgetWindowSpend {
+  entity_type     String
+  entity_id       String
+  window_duration String
+  window_start    DateTime
+  spend           Float    @default(0.0)
+  created_at      DateTime @default(now())
+  updated_at      DateTime @updatedAt
+
+  @@id([entity_type, entity_id, window_duration])
+}
+
 // View spend, model, api_key per request
 model LiteLLM_ErrorLogs {
   request_id          String   @id @default(uuid())

litellm/proxy/schema.prisma

@@ -664,6 +664,18 @@ model LiteLLM_SpendLogs {
   @@index([session_id])
 }
 
+model LiteLLM_BudgetWindowSpend {
+  entity_type     String
+  entity_id       String
+  window_duration String
+  window_start    DateTime
+  spend           Float    @default(0.0)
+  created_at      DateTime @default(now())
+  updated_at      DateTime @updatedAt
+
+  @@id([entity_type, entity_id, window_duration])
+}
+
 // View spend, model, api_key per request
 model LiteLLM_ErrorLogs {
   request_id          String   @id @default(uuid())

schema.prisma

@@ -664,6 +664,18 @@ model LiteLLM_SpendLogs {
   @@index([session_id])
 }
 
+model LiteLLM_BudgetWindowSpend {
+  entity_type     String
+  entity_id       String
+  window_duration String
+  window_start    DateTime
+  spend           Float    @default(0.0)
+  created_at      DateTime @default(now())
+  updated_at      DateTime @updatedAt
+
+  @@id([entity_type, entity_id, window_duration])
+}
+
 // View spend, model, api_key per request
 model LiteLLM_ErrorLogs {
   request_id          String   @id @default(uuid())

ui/litellm-dashboard/src/lib/http/schema.d.ts

@@ -26193,7 +26193,7 @@ export interface components {
              * @description Default role assigned to new users created
              * @default internal_user_viewer
              */
-            user_role: ("proxy_admin" | "proxy_admin_viewer" | "internal_user" | "internal_user_viewer") | null;
+            user_role: ("internal_user" | "internal_user_viewer" | "proxy_admin" | "proxy_admin_viewer") | null;
         };
         /**
          * DefaultTeamSSOParams