diff --git a/src/client/features/audit/launch/useLaunchController.ts b/src/client/features/audit/launch/useLaunchController.ts
index 46f709f..7c9ffd9 100644
--- a/src/client/features/audit/launch/useLaunchController.ts
+++ b/src/client/features/audit/launch/useLaunchController.ts
@@ -18,6 +18,7 @@ import {
   useSettingsForm,
   type LaunchState,
 } from "@/client/features/audit/launch/types";
+import { getStandardErrorMessage } from "@/client/lib/error-messages";
 
 export function useLaunchController({
   projectId,
@@ -116,8 +117,7 @@ export function useLaunchController({
         onError: (error) => {
           setState((prev) => ({
             ...prev,
-            startError:
-              error instanceof Error ? error.message : "Failed to start audit",
+            startError: getStandardErrorMessage(error, "Failed to start audit"),
           }));
         },
       },
diff --git a/src/client/features/keywords/hooks/useKeywordControlsForm.ts b/src/client/features/keywords/hooks/useKeywordControlsForm.ts
index 2f371ff..1ca66e6 100644
--- a/src/client/features/keywords/hooks/useKeywordControlsForm.ts
+++ b/src/client/features/keywords/hooks/useKeywordControlsForm.ts
@@ -1,4 +1,5 @@
 import { useForm } from "@tanstack/react-form";
+import { useEffect } from "react";
 import type {
   KeywordMode,
   ResultLimit,
@@ -12,7 +13,7 @@ type UseKeywordControlsFormInput = {
 };
 
 export function useKeywordControlsForm(input: UseKeywordControlsFormInput) {
-  return useForm({
+  const form = useForm({
     defaultValues: {
       keyword: input.keywordInput,
       locationCode: input.locationCode,
@@ -20,4 +21,19 @@ export function useKeywordControlsForm(input: UseKeywordControlsFormInput) {
       mode: input.keywordMode,
     },
   });
+
+  useEffect(() => {
+    form.setFieldValue("keyword", input.keywordInput);
+    form.setFieldValue("locationCode", input.locationCode);
+    form.setFieldValue("resultLimit", input.resultLimit);
+    form.setFieldValue("mode", input.keywordMode);
+  }, [
+    form,
+    input.keywordInput,
+    input.keywordMode,
+    input.locationCode,
+    input.resultLimit,
+  ]);
+
+  return form;
 }
diff --git a/src/client/features/keywords/hooks/usePreferredKeywordLocation.ts b/src/client/features/keywords/hooks/usePreferredKeywordLocation.ts
new file mode 100644
index 0000000..a27dcd4
--- /dev/null
+++ b/src/client/features/keywords/hooks/usePreferredKeywordLocation.ts
@@ -0,0 +1,50 @@
+import { useEffect, useState } from "react";
+import { z } from "zod";
+import {
+  DEFAULT_LOCATION_CODE,
+  isSupportedLocationCode,
+} from "@/client/features/keywords/locations";
+
+const STORAGE_KEY = "keyword-preferred-location";
+const locationCodeSchema = z.number().int().positive();
+
+function loadPreferredLocationCode() {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (!raw) return null;
+
+    const parsed = locationCodeSchema.parse(JSON.parse(raw));
+    return isSupportedLocationCode(parsed) ? parsed : null;
+  } catch {
+    return null;
+  }
+}
+
+function savePreferredLocationCode(locationCode: number) {
+  try {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(locationCode));
+  } catch {
+    // storage full or unavailable - silently ignore
+  }
+}
+
+export function usePreferredKeywordLocation() {
+  const [preferredLocationCode, setPreferredLocationCodeState] = useState(
+    DEFAULT_LOCATION_CODE,
+  );
+
+  useEffect(() => {
+    const savedLocationCode = loadPreferredLocationCode();
+    if (savedLocationCode != null) {
+      setPreferredLocationCodeState(savedLocationCode);
+    }
+  }, []);
+
+  function setPreferredLocationCode(locationCode: number) {
+    if (!isSupportedLocationCode(locationCode)) return;
+    setPreferredLocationCodeState(locationCode);
+    savePreferredLocationCode(locationCode);
+  }
+
+  return { preferredLocationCode, setPreferredLocationCode };
+}
diff --git a/src/client/features/keywords/keywordSearchParams.ts b/src/client/features/keywords/keywordSearchParams.ts
index 37257b3..09ff9d8 100644
--- a/src/client/features/keywords/keywordSearchParams.ts
+++ b/src/client/features/keywords/keywordSearchParams.ts
@@ -28,7 +28,7 @@ export function normalizeLegacyKeywordSearch(search: KeywordSearchParams): {
   const normalized: KeywordSearchParams = {
     ...search,
     q: search.q === "" ? undefined : search.q,
-    loc: search.loc === 2840 ? undefined : search.loc,
+    loc: search.loc,
     kLimit: search.kLimit === 150 ? undefined : search.kLimit,
     mode: search.mode === "auto" ? undefined : search.mode,
     sort: search.sort === "searchVolume" ? undefined : search.sort,
diff --git a/src/client/features/keywords/locations.ts b/src/client/features/keywords/locations.ts
new file mode 100644
index 0000000..914cbf8
--- /dev/null
+++ b/src/client/features/keywords/locations.ts
@@ -0,0 +1,70 @@
+export const DEFAULT_LOCATION_CODE = 2840;
+
+export const LOCATION_OPTIONS = [
+  { code: 2840, label: "United States", shortLabel: "US", languageCode: "en" },
+  { code: 2826, label: "United Kingdom", shortLabel: "UK", languageCode: "en" },
+  { code: 2124, label: "Canada", shortLabel: "CA", languageCode: "en" },
+  { code: 2036, label: "Australia", shortLabel: "AU", languageCode: "en" },
+  { code: 2372, label: "Ireland", shortLabel: "IE", languageCode: "en" },
+  { code: 2554, label: "New Zealand", shortLabel: "NZ", languageCode: "en" },
+  { code: 2356, label: "India", shortLabel: "IN", languageCode: "en" },
+  { code: 2702, label: "Singapore", shortLabel: "SG", languageCode: "en" },
+  { code: 2710, label: "South Africa", shortLabel: "ZA", languageCode: "en" },
+  { code: 2608, label: "Philippines", shortLabel: "PH", languageCode: "en" },
+  { code: 2276, label: "Germany", shortLabel: "DE", languageCode: "de" },
+  { code: 2250, label: "France", shortLabel: "FR", languageCode: "fr" },
+  { code: 2528, label: "Netherlands", shortLabel: "NL", languageCode: "nl" },
+  { code: 2724, label: "Spain", shortLabel: "ES", languageCode: "es" },
+  { code: 2380, label: "Italy", shortLabel: "IT", languageCode: "it" },
+  { code: 2620, label: "Portugal", shortLabel: "PT", languageCode: "pt" },
+  { code: 2040, label: "Austria", shortLabel: "AT", languageCode: "de" },
+  { code: 2756, label: "Switzerland", shortLabel: "CH", languageCode: "de" },
+  { code: 2752, label: "Sweden", shortLabel: "SE", languageCode: "sv" },
+  { code: 2578, label: "Norway", shortLabel: "NO", languageCode: "nb" },
+  { code: 2208, label: "Denmark", shortLabel: "DK", languageCode: "da" },
+  { code: 2616, label: "Poland", shortLabel: "PL", languageCode: "pl" },
+  { code: 2203, label: "Czechia", shortLabel: "CZ", languageCode: "cs" },
+  { code: 2642, label: "Romania", shortLabel: "RO", languageCode: "ro" },
+  { code: 2792, label: "Turkey", shortLabel: "TR", languageCode: "tr" },
+  { code: 2300, label: "Greece", shortLabel: "GR", languageCode: "el" },
+  { code: 2348, label: "Hungary", shortLabel: "HU", languageCode: "hu" },
+  { code: 2076, label: "Brazil", shortLabel: "BR", languageCode: "pt" },
+  { code: 2484, label: "Mexico", shortLabel: "MX", languageCode: "es" },
+  { code: 2032, label: "Argentina", shortLabel: "AR", languageCode: "es" },
+  { code: 2170, label: "Colombia", shortLabel: "CO", languageCode: "es" },
+  { code: 2152, label: "Chile", shortLabel: "CL", languageCode: "es" },
+  { code: 2604, label: "Peru", shortLabel: "PE", languageCode: "es" },
+  { code: 2392, label: "Japan", shortLabel: "JP", languageCode: "ja" },
+  { code: 2410, label: "South Korea", shortLabel: "KR", languageCode: "ko" },
+  { code: 2360, label: "Indonesia", shortLabel: "ID", languageCode: "id" },
+  { code: 2458, label: "Malaysia", shortLabel: "MY", languageCode: "ms" },
+  { code: 2764, label: "Thailand", shortLabel: "TH", languageCode: "th" },
+  { code: 2704, label: "Vietnam", shortLabel: "VN", languageCode: "vi" },
+  {
+    code: 2784,
+    label: "United Arab Emirates",
+    shortLabel: "AE",
+    languageCode: "en",
+  },
+  { code: 2682, label: "Saudi Arabia", shortLabel: "SA", languageCode: "ar" },
+] as const;
+
+const LOCATION_CODES = new Set<number>(
+  LOCATION_OPTIONS.map((option) => option.code),
+);
+
+export const LOCATIONS: Record<number, string> = Object.fromEntries(
+  LOCATION_OPTIONS.map((option) => [option.code, option.shortLabel]),
+);
+
+const LOCATION_LANGUAGE: Record<number, string> = Object.fromEntries(
+  LOCATION_OPTIONS.map((option) => [option.code, option.languageCode]),
+);
+
+export function getLanguageCode(locationCode: number): string {
+  return LOCATION_LANGUAGE[locationCode] ?? "en";
+}
+
+export function isSupportedLocationCode(locationCode: number): boolean {
+  return LOCATION_CODES.has(locationCode);
+}
diff --git a/src/client/features/keywords/page/KeywordResearchSearchBar.tsx b/src/client/features/keywords/page/KeywordResearchSearchBar.tsx
index c690d23..7e3b842 100644
--- a/src/client/features/keywords/page/KeywordResearchSearchBar.tsx
+++ b/src/client/features/keywords/page/KeywordResearchSearchBar.tsx
@@ -4,23 +4,13 @@ import {
   normalizeKeywordMode,
 } from "@/client/features/keywords/keywordSearchParams";
 import { RESULT_LIMITS } from "@/client/features/keywords/keywordResearchTypes";
+import { LOCATION_OPTIONS } from "@/client/features/keywords/locations";
 import type { KeywordResearchControllerState } from "./types";
 
 type Props = {
   controller: KeywordResearchControllerState;
 };
 
-const LOCATION_OPTIONS = [
-  { code: 2840, label: "United States" },
-  { code: 2826, label: "United Kingdom" },
-  { code: 2276, label: "Germany" },
-  { code: 2250, label: "France" },
-  { code: 2036, label: "Australia" },
-  { code: 2124, label: "Canada" },
-  { code: 2356, label: "India" },
-  { code: 2076, label: "Brazil" },
-];
-
 export function KeywordResearchSearchBar({ controller }: Props) {
   const { controlsForm, handleSearchSubmit, isLoading, searchInputError } =
     controller;
diff --git a/src/client/features/keywords/state/keywordControllerActions.ts b/src/client/features/keywords/state/keywordControllerActions.ts
index 583787d..1062d14 100644
--- a/src/client/features/keywords/state/keywordControllerActions.ts
+++ b/src/client/features/keywords/state/keywordControllerActions.ts
@@ -1,5 +1,6 @@
 import { type FormEvent } from "react";
 import { toast } from "sonner";
+import { DEFAULT_LOCATION_CODE } from "@/client/features/keywords/locations";
 import { buildCsv, downloadCsv } from "@/client/lib/csv";
 import { getStandardErrorMessage } from "@/client/lib/error-messages";
 import type {
@@ -48,6 +49,7 @@ type SearchActionParams = {
   setSearchParams: (
     updates: Record<string, string | number | boolean | undefined>,
   ) => void;
+  setPreferredLocationCode: (locationCode: number) => void;
 };
 
 type SaveExportActionParams = {
@@ -96,6 +98,7 @@ export function useSearchActions(params: SearchActionParams) {
     setSerpPage,
     setSearchInputError,
     setSearchParams,
+    setPreferredLocationCode,
   } = params;
 
   const onSearch = (
@@ -120,9 +123,14 @@ export function useSearchActions(params: SearchActionParams) {
     }
 
     setSearchInputError(null);
+    setPreferredLocationCode(activeLocation);
     setSearchParams({
       q: inputKeyword,
-      loc: activeLocation === 2840 ? undefined : activeLocation,
+      loc:
+        input.hasExplicitLocationCode ||
+        activeLocation !== DEFAULT_LOCATION_CODE
+          ? activeLocation
+          : undefined,
       kLimit: activeResultLimit === 150 ? undefined : activeResultLimit,
       mode: activeMode === "auto" ? undefined : activeMode,
     });
diff --git a/src/client/features/keywords/state/useKeywordResearchController.ts b/src/client/features/keywords/state/useKeywordResearchController.ts
index e8417ca..459dd22 100644
--- a/src/client/features/keywords/state/useKeywordResearchController.ts
+++ b/src/client/features/keywords/state/useKeywordResearchController.ts
@@ -3,6 +3,7 @@ import { useMutation, useQueryClient } from "@tanstack/react-query";
 import { useCallback, useState } from "react";
 import { useKeywordControlsForm } from "@/client/features/keywords/hooks/useKeywordControlsForm";
 import { useKeywordFiltering } from "@/client/features/keywords/hooks/useKeywordFiltering";
+import { usePreferredKeywordLocation } from "@/client/features/keywords/hooks/usePreferredKeywordLocation";
 import { useLocalKeywordFilters } from "@/client/features/keywords/hooks/useLocalKeywordFilters";
 import { useKeywordResearchData } from "@/client/features/keywords/hooks/useKeywordResearchData";
 import { useKeywordSelection } from "@/client/features/keywords/hooks/useKeywordSelection";
@@ -25,6 +26,7 @@ export type KeywordResearchControllerInput = {
   projectId: string;
   keywordInput: string;
   locationCode: number;
+  hasExplicitLocationCode: boolean;
   resultLimit: ResultLimit;
   keywordMode: KeywordMode;
   sortField: SortField;
@@ -47,6 +49,7 @@ export function useKeywordResearchController(
     setSerpPage: state.setSerpPage,
     setSearchInputError: state.setSearchInputError,
     setSearchParams: state.setSearchParams,
+    setPreferredLocationCode: state.setPreferredLocationCode,
   });
 
   const { handleSaveKeywords, confirmSave, exportCsv } =
@@ -122,11 +125,14 @@ export function useKeywordResearchController(
 }
 
 function useKeywordControllerState(input: KeywordResearchControllerInput) {
-  const [showFilters, setShowFilters] = useState(false);
-  const [selectedKeyword, setSelectedKeyword] =
-    useState<KeywordResearchRow | null>(null);
+  const uiState = useKeywordUiState();
+  const { locationCode, setPreferredLocationCode } =
+    useResolvedKeywordLocation(input);
 
-  const controlsForm = useKeywordControlsForm(input);
+  const controlsForm = useKeywordControlsForm({
+    ...input,
+    locationCode,
+  });
   const {
     filtersForm,
     values: filterValues,
@@ -144,7 +150,7 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     activeSerpKeyword,
     serpLoading,
     serpError,
-  } = useKeywordSerpAnalysis(input.locationCode);
+  } = useKeywordSerpAnalysis(locationCode);
 
   const {
     history,
@@ -168,9 +174,6 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     beginSearch,
     runSearch,
   } = useKeywordResearchData(addSearch);
-  const [searchInputError, setSearchInputError] = useState<string | null>(null);
-  const [showSaveDialog, setShowSaveDialog] = useState(false);
-  const [mobileTab, setMobileTab] = useState<"keywords" | "serp">("keywords");
   const setSearchParams = useKeywordSearchParams();
   const saveMutation = useKeywordSaveMutation(input.projectId);
 
@@ -185,14 +188,14 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     useKeywordOverviewState({
       rows,
       searchedKeyword,
-      selectedKeyword,
+      selectedKeyword: uiState.selectedKeyword,
       hasSearched,
       isLoading,
       lastSearchError,
       keywordMode: input.keywordMode,
     });
 
-  return {
+  return buildKeywordControllerState({
     activeFilterCount,
     activeSerpKeyword,
     beginSearch,
@@ -210,7 +213,7 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     lastSearchKeyword,
     lastSearchLocationCode,
     lastUsedFallback,
-    mobileTab,
+    mobileTab: uiState.mobileTab,
     overviewKeyword,
     removeHistoryItem,
     researchError,
@@ -218,11 +221,12 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     resetFilters,
     rows,
     searchedKeyword,
-    searchInputError,
-    selectedKeyword,
+    searchInputError: uiState.searchInputError,
+    selectedKeyword: uiState.selectedKeyword,
     selectedRows,
     saveMutation,
-    setSelectedKeyword,
+    setPreferredLocationCode,
+    setSelectedKeyword: uiState.setSelectedKeyword,
     setSearchParams,
     setSerpKeyword,
     serpError,
@@ -230,17 +234,50 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     serpPage,
     serpQuery,
     serpResults,
-    setMobileTab,
-    setSearchInputError,
+    setMobileTab: uiState.setMobileTab,
+    setSearchInputError: uiState.setSearchInputError,
     setSerpPage,
-    setShowFilters,
-    setShowSaveDialog,
+    setShowFilters: uiState.setShowFilters,
+    setShowSaveDialog: uiState.setShowSaveDialog,
     showApproximateMatchNotice,
-    showFilters,
-    showSaveDialog,
+    showFilters: uiState.showFilters,
+    showSaveDialog: uiState.showSaveDialog,
     toggleAllRows,
     toggleRowSelection,
     SERP_PAGE_SIZE,
+  });
+}
+
+function useResolvedKeywordLocation(input: KeywordResearchControllerInput) {
+  const { preferredLocationCode, setPreferredLocationCode } =
+    usePreferredKeywordLocation();
+  const locationCode =
+    !input.hasExplicitLocationCode && input.keywordInput === ""
+      ? preferredLocationCode
+      : input.locationCode;
+
+  return { locationCode, setPreferredLocationCode };
+}
+
+function useKeywordUiState() {
+  const [showFilters, setShowFilters] = useState(false);
+  const [selectedKeyword, setSelectedKeyword] =
+    useState<KeywordResearchRow | null>(null);
+  const [searchInputError, setSearchInputError] = useState<string | null>(null);
+  const [showSaveDialog, setShowSaveDialog] = useState(false);
+  const [mobileTab, setMobileTab] = useState<"keywords" | "serp">("keywords");
+
+  return {
+    mobileTab,
+    searchInputError,
+    selectedKeyword,
+    setMobileTab,
+    setSearchInputError,
+    setSelectedKeyword,
+    setShowFilters,
+    setShowSaveDialog,
+    showFilters,
+    showSaveDialog,
   };
 }
 
@@ -279,3 +316,9 @@ function useKeywordSaveMutation(projectId: string) {
 function buildControllerOutput<T extends Record<string, unknown>>(state: T): T {
   return state;
 }
+
+function buildKeywordControllerState<T extends Record<string, unknown>>(
+  state: T,
+): T {
+  return state;
+}
diff --git a/src/client/features/keywords/utils.ts b/src/client/features/keywords/utils.ts
index 922d980..1f3bc4a 100644
--- a/src/client/features/keywords/utils.ts
+++ b/src/client/features/keywords/utils.ts
@@ -1,28 +1,4 @@
-export const LOCATIONS: Record<number, string> = {
-  2840: "US",
-  2826: "UK",
-  2276: "DE",
-  2250: "FR",
-  2036: "AU",
-  2124: "CA",
-  2356: "IN",
-  2076: "BR",
-};
-
-const LOCATION_LANGUAGE: Record<number, string> = {
-  2840: "en",
-  2826: "en",
-  2276: "de",
-  2250: "fr",
-  2036: "en",
-  2124: "en",
-  2356: "en",
-  2076: "pt",
-};
-
-export function getLanguageCode(locationCode: number): string {
-  return LOCATION_LANGUAGE[locationCode] ?? "en";
-}
+export { LOCATIONS, getLanguageCode } from "./locations";
 
 export function scoreTierClass(value: number | null): string {
   if (value == null) return "score-tier-na";
diff --git a/src/client/lib/error-messages.ts b/src/client/lib/error-messages.ts
index 50f8c5c..c1e3a40 100644
--- a/src/client/lib/error-messages.ts
+++ b/src/client/lib/error-messages.ts
@@ -6,6 +6,8 @@ const STANDARD_MESSAGES: Record<ErrorCode, string> = {
     "OpenSEO auth is not configured. Follow the README setup steps for Cloudflare Access.",
   FORBIDDEN: "You do not have access to this resource.",
   NOT_FOUND: "The requested resource was not found.",
+  AUDIT_CAPACITY_REACHED:
+    "You've reached audit capacity for your account. Delete old audits from your projects to start a new one.",
   VALIDATION_ERROR: "Please check your input and try again.",
   CRAWL_TARGET_BLOCKED: "This crawl target is blocked by security policy.",
   RATE_LIMITED: "Too many requests. Please wait and try again.",
diff --git a/src/routes/p/$projectId/keywords.tsx b/src/routes/p/$projectId/keywords.tsx
index 4167d1e..4d198cc 100644
--- a/src/routes/p/$projectId/keywords.tsx
+++ b/src/routes/p/$projectId/keywords.tsx
@@ -1,4 +1,5 @@
 import { createFileRoute, redirect } from "@tanstack/react-router";
+import { DEFAULT_LOCATION_CODE } from "@/client/features/keywords/locations";
 import { KeywordResearchPage } from "@/client/features/keywords/page/KeywordResearchPage";
 import {
   isResultLimit,
@@ -27,20 +28,23 @@ export const Route = createFileRoute("/p/$projectId/keywords")({
 
 function KeywordResearchPageRoute() {
   const { projectId } = Route.useParams();
+  const search = Route.useSearch();
   const {
     q: keywordInput = "",
-    loc: locationCode = 2840,
+    loc: rawLocationCode,
     kLimit: resultLimit = 150,
     mode: keywordMode = "auto",
     sort: sortField = "searchVolume",
     order: sortDir = "desc",
-  } = Route.useSearch();
+  } = search;
+  const locationCode = rawLocationCode ?? DEFAULT_LOCATION_CODE;
 
   return (
     <KeywordResearchPage
       projectId={projectId}
       keywordInput={keywordInput}
       locationCode={locationCode}
+      hasExplicitLocationCode={search.loc != null}
       resultLimit={isResultLimit(resultLimit) ? resultLimit : 150}
       keywordMode={normalizeKeywordMode(keywordMode)}
       sortField={normalizeSortField(sortField)}
diff --git a/src/server/features/audit/repositories/AuditRepository.ts b/src/server/features/audit/repositories/AuditRepository.ts
index a272ef4..7531fda 100644
--- a/src/server/features/audit/repositories/AuditRepository.ts
+++ b/src/server/features/audit/repositories/AuditRepository.ts
@@ -4,7 +4,7 @@
  */
 import { db } from "@/db";
 import { audits, auditPages, auditPsiResults, projects } from "@/db/schema";
-import { and, eq, desc } from "drizzle-orm";
+import { and, desc, eq } from "drizzle-orm";
 import type { PsiResult, AuditConfig } from "@/server/lib/audit/types";
 
 // ─── Create ──────────────────────────────────────────────────────────────────
@@ -16,6 +16,8 @@ async function createAudit(data: {
   startUrl: string;
   workflowInstanceId: string;
   config: AuditConfig;
+  pagesTotal: number;
+  psiTotal: number;
 }) {
   await db.insert(audits).values({
     id: data.id,
@@ -25,6 +27,9 @@ async function createAudit(data: {
     workflowInstanceId: data.workflowInstanceId,
     config: JSON.stringify(data.config),
     status: "running",
+    pagesTotal: data.pagesTotal,
+    psiTotal: data.psiTotal,
+    currentPhase: "discovery",
   });
 }
 
@@ -251,6 +256,18 @@ async function getAuditsByProjectForUser(projectId: string, userId: string) {
   });
 }
 
+async function getAuditCapacityUsageForUser(userId: string) {
+  const rows = await db.query.audits.findMany({
+    where: eq(audits.userId, userId),
+    columns: {
+      pagesTotal: true,
+      psiTotal: true,
+    },
+  });
+
+  return rows.reduce((total, row) => total + row.pagesTotal + row.psiTotal, 0);
+}
+
 async function getAuditResultsForUser(auditId: string, userId: string) {
   const audit = await getAuditForUser(auditId, userId);
   if (!audit) {
@@ -335,6 +352,7 @@ export const AuditRepository = {
   isProjectOwnedByUser,
   getAuditForUser,
   getAuditsByProjectForUser,
+  getAuditCapacityUsageForUser,
   getAuditResultsForUser,
   getPsiResultById,
   deleteAuditForUser,
diff --git a/src/server/features/audit/services/AuditService.ts b/src/server/features/audit/services/AuditService.ts
index ae4062f..ee8aa1c 100644
--- a/src/server/features/audit/services/AuditService.ts
+++ b/src/server/features/audit/services/AuditService.ts
@@ -9,6 +9,11 @@ import { normalizeAndValidateStartUrl } from "@/server/lib/audit/url-policy";
 import { AppError } from "@/server/lib/errors";
 import type { AuditConfig, PsiStrategy } from "@/server/lib/audit/types";
 import { KeywordResearchRepository } from "@/server/features/keywords/repositories/KeywordResearchRepository";
+import {
+  clampAuditMaxPages,
+  getEstimatedAuditCapacity,
+  MAX_USER_AUDIT_USAGE,
+} from "@/server/features/audit/services/audit-capacity";
 import { jsonCodec } from "@/shared/json";
 import { z } from "zod";
 
@@ -34,6 +39,9 @@ async function startAudit(input: {
   psiStrategy?: PsiStrategy;
   psiApiKey?: string;
 }) {
+  const maxPages = clampAuditMaxPages(input.maxPages);
+  const psiStrategy = input.psiStrategy ?? "auto";
+
   const hasProjectAccess = await AuditRepository.isProjectOwnedByUser(
     input.projectId,
     input.userId,
@@ -42,9 +50,22 @@ async function startAudit(input: {
     throw new AppError("FORBIDDEN");
   }
 
+  const reservation = getEstimatedAuditCapacity({
+    maxPages,
+    psiStrategy,
+  });
+
+  const currentUsage = await AuditRepository.getAuditCapacityUsageForUser(
+    input.userId,
+  );
+
+  if (currentUsage + reservation.total > MAX_USER_AUDIT_USAGE) {
+    throw new AppError("AUDIT_CAPACITY_REACHED");
+  }
+
   const auditId = crypto.randomUUID();
 
-  const shouldRunPsi = (input.psiStrategy ?? "auto") !== "none";
+  const shouldRunPsi = psiStrategy !== "none";
   let resolvedPsiApiKey = input.psiApiKey?.trim();
 
   if (shouldRunPsi && !resolvedPsiApiKey) {
@@ -60,35 +81,47 @@ async function startAudit(input: {
   }
 
   const config: AuditConfig = {
-    maxPages: Math.min(Math.max(input.maxPages ?? 50, 10), 10_000),
-    psiStrategy: input.psiStrategy ?? "auto",
+    maxPages,
+    psiStrategy,
     // PSI key is used for Google quota/abuse control (non-billing).
     psiApiKey: resolvedPsiApiKey,
   };
 
   const startUrl = await normalizeAndValidateStartUrl(input.startUrl);
 
-  // Trigger the Cloudflare Workflow
-  const instance = await env.SITE_AUDIT_WORKFLOW.create({
-    id: auditId,
-    params: {
-      auditId,
-      projectId: input.projectId,
-      startUrl,
-      config,
-    },
-  });
-
-  // Create the audit row in D1
   await AuditRepository.createAudit({
     id: auditId,
     projectId: input.projectId,
     userId: input.userId,
     startUrl,
-    workflowInstanceId: instance.id,
+    workflowInstanceId: auditId,
     config,
+    pagesTotal: reservation.pagesTotal,
+    psiTotal: reservation.psiTotal,
   });
 
+  // Trigger the Cloudflare Workflow
+  try {
+    await env.SITE_AUDIT_WORKFLOW.create({
+      id: auditId,
+      params: {
+        auditId,
+        projectId: input.projectId,
+        startUrl,
+        config,
+      },
+    });
+  } catch (error) {
+    try {
+      const instance = await env.SITE_AUDIT_WORKFLOW.get(auditId);
+      await instance.terminate();
+    } catch {
+      // The workflow may never have been created, or may already be gone.
+    }
+    await AuditRepository.deleteAuditForUser(auditId, input.userId);
+    throw error;
+  }
+
   return { auditId };
 }
 
@@ -185,6 +218,24 @@ async function remove(auditId: string, userId: string) {
   if (!audit) {
     throw new AppError("NOT_FOUND");
   }
+  if (audit.status === "running") {
+    if (!audit.workflowInstanceId) {
+      throw new AppError(
+        "CONFLICT",
+        "Cannot delete a running audit without workflow context.",
+      );
+    }
+
+    try {
+      const instance = await env.SITE_AUDIT_WORKFLOW.get(
+        audit.workflowInstanceId,
+      );
+      await instance.terminate();
+    } catch (error) {
+      console.error(`Failed to terminate audit workflow ${audit.id}:`, error);
+      throw new AppError("CONFLICT", "Unable to stop the running audit.");
+    }
+  }
   await AuditRepository.deleteAuditForUser(auditId, userId);
 }
 
diff --git a/src/server/features/audit/services/audit-capacity.test.ts b/src/server/features/audit/services/audit-capacity.test.ts
new file mode 100644
index 0000000..a38a6e4
--- /dev/null
+++ b/src/server/features/audit/services/audit-capacity.test.ts
@@ -0,0 +1,53 @@
+import { describe, expect, it } from "vitest";
+import {
+  clampAuditMaxPages,
+  getEstimatedAuditCapacity,
+  MAX_USER_AUDIT_USAGE,
+} from "@/server/features/audit/services/audit-capacity";
+
+describe("audit capacity helpers", () => {
+  it("clamps max pages into the supported range", () => {
+    expect(clampAuditMaxPages()).toBe(50);
+    expect(clampAuditMaxPages(1)).toBe(10);
+    expect(clampAuditMaxPages(500)).toBe(500);
+    expect(clampAuditMaxPages(20_000)).toBe(10_000);
+  });
+
+  it("estimates capacity for each psi strategy", () => {
+    expect(
+      getEstimatedAuditCapacity({ maxPages: 100, psiStrategy: "none" }),
+    ).toEqual({
+      pagesTotal: 100,
+      psiTotal: 0,
+      total: 100,
+    });
+    expect(
+      getEstimatedAuditCapacity({ maxPages: 100, psiStrategy: "manual" }),
+    ).toEqual({
+      pagesTotal: 100,
+      psiTotal: 0,
+      total: 100,
+    });
+    expect(
+      getEstimatedAuditCapacity({ maxPages: 100, psiStrategy: "auto" }),
+    ).toEqual({
+      pagesTotal: 100,
+      psiTotal: 20,
+      total: 120,
+    });
+    expect(
+      getEstimatedAuditCapacity({ maxPages: 100, psiStrategy: "all" }),
+    ).toEqual({
+      pagesTotal: 100,
+      psiTotal: 200,
+      total: 300,
+    });
+  });
+
+  it("stays within the global capacity limit for the maximum auto audit", () => {
+    expect(
+      getEstimatedAuditCapacity({ maxPages: 10_000, psiStrategy: "auto" })
+        .total,
+    ).toBeLessThan(MAX_USER_AUDIT_USAGE);
+  });
+});
diff --git a/src/server/features/audit/services/audit-capacity.ts b/src/server/features/audit/services/audit-capacity.ts
new file mode 100644
index 0000000..97f6da5
--- /dev/null
+++ b/src/server/features/audit/services/audit-capacity.ts
@@ -0,0 +1,35 @@
+import type { PsiStrategy } from "@/server/lib/audit/types";
+
+export const MAX_USER_AUDIT_USAGE = 100_000;
+
+export function clampAuditMaxPages(maxPages?: number) {
+  return Math.min(Math.max(maxPages ?? 50, 10), 10_000);
+}
+
+export function getEstimatedAuditCapacity(input: {
+  maxPages?: number;
+  psiStrategy?: PsiStrategy;
+}) {
+  const pagesTotal = clampAuditMaxPages(input.maxPages);
+  const psiStrategy = input.psiStrategy ?? "auto";
+
+  let psiTotal = 0;
+  switch (psiStrategy) {
+    case "all":
+      psiTotal = pagesTotal * 2;
+      break;
+    case "auto":
+      psiTotal = 20;
+      break;
+    case "manual":
+    case "none":
+      psiTotal = 0;
+      break;
+  }
+
+  return {
+    pagesTotal,
+    psiTotal,
+    total: pagesTotal + psiTotal,
+  };
+}
diff --git a/src/shared/error-codes.ts b/src/shared/error-codes.ts
index 923f9e8..fbb6e40 100644
--- a/src/shared/error-codes.ts
+++ b/src/shared/error-codes.ts
@@ -5,6 +5,7 @@ const ERROR_CODES = [
   "AUTH_CONFIG_MISSING",
   "FORBIDDEN",
   "NOT_FOUND",
+  "AUDIT_CAPACITY_REACHED",
   "VALIDATION_ERROR",
   "CRAWL_TARGET_BLOCKED",
   "RATE_LIMITED",