diff --git a/src/components/miners/MinerOpenDiscoveryIssuesByRepo.tsx b/src/components/miners/MinerOpenDiscoveryIssuesByRepo.tsx
index 7951ddbc..99d2ac28 100644
--- a/src/components/miners/MinerOpenDiscoveryIssuesByRepo.tsx
+++ b/src/components/miners/MinerOpenDiscoveryIssuesByRepo.tsx
@@ -18,9 +18,11 @@ import type { MinerIssue } from '../../api/models/Dashboard';
 import {
   getRepositoryOwnerAvatarSrc,
   getScoringWindowStartIso,
+  isIssueStatusFilter,
   isOutsideScoringWindow,
   minerPrPath,
   paginateItems,
+  type IssueStatusFilter,
 } from '../../utils';
 import {
   DataTable,
@@ -32,19 +34,11 @@ import TablePagination from '../common/TablePagination';
 import { tooltipSlotProps } from '../../theme';
 import { useDataTableParams } from '../../hooks/useDataTableParams';
 
-type IssueStatusFilter = 'all' | 'open' | 'solved' | 'closed';
 type IssueSortField = 'number' | 'repository' | 'date';
 type SortDir = 'asc' | 'desc';
 
 const PAGE_SIZE = 20;
 
-const ISSUE_STATUS_FILTERS: readonly IssueStatusFilter[] = [
-  'all',
-  'open',
-  'solved',
-  'closed',
-];
-
 const DEFAULT_SORT_DIR: Record<IssueSortField, SortDir> = {
   number: 'desc',
   repository: 'asc',
@@ -57,11 +51,6 @@ const isSolvedIssue = (i: MinerIssue) =>
 const isClosedIssue = (i: MinerIssue) =>
   i.state === 'CLOSED' && !i.solving_pr?.merged_at;
 
-const isIssueStatusFilter = (
-  value: string | null,
-): value is IssueStatusFilter =>
-  value !== null && (ISSUE_STATUS_FILTERS as readonly string[]).includes(value);
-
 const filterIssues = (
   issues: MinerIssue[],
   {
diff --git a/src/components/miners/MinerPRsTable.tsx b/src/components/miners/MinerPRsTable.tsx
index 983a7df8..4ead4a67 100644
--- a/src/components/miners/MinerPRsTable.tsx
+++ b/src/components/miners/MinerPRsTable.tsx
@@ -30,6 +30,7 @@ import {
   getRepositoryOwnerAvatarSrc,
   getPrStatusCounts,
   isOutsideScoringWindow,
+  isPrStatusFilter,
   type PrStatusFilter,
 } from '../../utils';
 import {
@@ -65,13 +66,6 @@ type PrSortField =
   | 'watch';
 type SortDir = 'asc' | 'desc';
 
-const PR_STATUS_FILTERS: readonly PrStatusFilter[] = [
-  'all',
-  'open',
-  'merged',
-  'closed',
-];
-
 // Direction applied when a user first clicks a column header — string
 // columns feel natural ascending, numeric/date columns descending.
 const DEFAULT_SORT_DIR: Record<PrSortField, SortDir> = {
@@ -105,9 +99,6 @@ const getScoreTooltip = (pr: CommitLog): string | null => {
   return parts.join(' · ');
 };
 
-const isPrStatusFilter = (value: string | null): value is PrStatusFilter =>
-  value !== null && (PR_STATUS_FILTERS as readonly string[]).includes(value);
-
 // Stable per-PR key — shared by the DataTable row key and the expanded-row
 // tracking set so the two never drift.
 const prRowKey = (pr: CommitLog): string =>
diff --git a/src/components/repositories/RepositoryPRsTable.tsx b/src/components/repositories/RepositoryPRsTable.tsx
index 4a04c02b..60f729ee 100644
--- a/src/components/repositories/RepositoryPRsTable.tsx
+++ b/src/components/repositories/RepositoryPRsTable.tsx
@@ -33,6 +33,7 @@ import theme, { TEXT_OPACITY, scrollbarSx } from '../../theme';
 import {
   filterPrs,
   getPrStatusCounts,
+  isPrStatusFilter,
   minerPrPath,
   type PrStatusFilter,
 } from '../../utils';
@@ -69,9 +70,6 @@ interface RepositoryPRsTableProps {
   state?: 'open' | 'closed' | 'merged' | 'all';
 }
 
-const isPrStatusFilter = (v: unknown): v is PrStatusFilter =>
-  v === 'all' || v === 'open' || v === 'merged' || v === 'closed';
-
 const PR_PAGE_SIZE = 20;
 
 const RepositoryPRsTable: React.FC<RepositoryPRsTableProps> = ({
diff --git a/src/pages/WatchlistPage.tsx b/src/pages/WatchlistPage.tsx
index 245f6231..aa903ef7 100644
--- a/src/pages/WatchlistPage.tsx
+++ b/src/pages/WatchlistPage.tsx
@@ -102,9 +102,11 @@ import { usePrSourceFilter } from '../hooks/usePrSourceFilter';
 import {
   isMergedPr,
   isClosedUnmergedPr,
+  isPrStatusFilter,
   getPrStatusCounts,
+  type PrStatusFilter,
 } from '../utils/prStatus';
-import { filterPrs, type PrStatusFilter } from '../utils/prTable';
+import { filterPrs } from '../utils/prTable';
 import { getIssueStatusMeta } from '../utils/issueStatus';
 import { formatDate, formatTokenAmount, formatWeight } from '../utils/format';
 import { getRepositoryOwnerAvatarSrc } from '../utils/avatar';
@@ -1030,9 +1032,6 @@ type WatchedRepoStats = Repository & {
   discoveryContributors: Set<string>;
 };
 
-const isPrStatusFilterStored = (v: unknown): v is PrStatusFilter =>
-  v === 'all' || v === 'open' || v === 'merged' || v === 'closed';
-
 type RepoSortKey =
   | 'name'
   | 'weight'
@@ -3238,7 +3237,7 @@ const PRsList: React.FC<{ itemKeys: string[] }> = ({ itemKeys }) => {
   const [statusFilter, setStatusFilter] = useSessionStoredState<PrStatusFilter>(
     'watchlist:prs:statusFilter',
     'all',
-    isPrStatusFilterStored,
+    isPrStatusFilter,
   );
   const [viewMode, setViewMode] = useWatchlistViewMode();
   const [page, setPage] = useState(0);
diff --git a/src/utils/issueStatus.ts b/src/utils/issueStatus.ts
index 9dcd274a..af72c51f 100644
--- a/src/utils/issueStatus.ts
+++ b/src/utils/issueStatus.ts
@@ -1,6 +1,21 @@
 import { alpha } from '@mui/material/styles';
 import { STATUS_COLORS } from '../theme';
 
+export type IssueStatusFilter = 'all' | 'open' | 'solved' | 'closed';
+
+export const ISSUE_STATUS_FILTERS: readonly IssueStatusFilter[] = [
+  'all',
+  'open',
+  'solved',
+  'closed',
+];
+
+export const isIssueStatusFilter = (
+  value: unknown,
+): value is IssueStatusFilter =>
+  typeof value === 'string' &&
+  (ISSUE_STATUS_FILTERS as readonly string[]).includes(value);
+
 interface IssueStatusMeta {
   bgColor: string;
   borderColor: string;
diff --git a/src/utils/prStatus.ts b/src/utils/prStatus.ts
index ac927563..362054ba 100644
--- a/src/utils/prStatus.ts
+++ b/src/utils/prStatus.ts
@@ -3,6 +3,19 @@ interface PrStatusLike {
   prState?: string | null;
 }
 
+export type PrStatusFilter = 'all' | 'open' | 'merged' | 'closed';
+
+export const PR_STATUS_FILTERS: readonly PrStatusFilter[] = [
+  'all',
+  'open',
+  'merged',
+  'closed',
+];
+
+export const isPrStatusFilter = (value: unknown): value is PrStatusFilter =>
+  typeof value === 'string' &&
+  (PR_STATUS_FILTERS as readonly string[]).includes(value);
+
 export const isOpenPr = (pr: PrStatusLike): boolean =>
   pr.prState === 'OPEN' || (!pr.prState && !pr.mergedAt);
 
diff --git a/src/utils/prTable.ts b/src/utils/prTable.ts
index 1b82afba..3a0ecbbf 100644
--- a/src/utils/prTable.ts
+++ b/src/utils/prTable.ts
@@ -1,5 +1,10 @@
 import { type CommitLog } from '../api';
-import { isClosedUnmergedPr, isMergedPr, isOpenPr } from './prStatus';
+import {
+  isClosedUnmergedPr,
+  isMergedPr,
+  isOpenPr,
+  type PrStatusFilter,
+} from './prStatus';
 
 /** Substring match against merged timestamp (ISO, locale date/time, year). */
 const mergedAtMatchesSearch = (
@@ -16,8 +21,6 @@ const mergedAtMatchesSearch = (
   return false;
 };
 
-export type PrStatusFilter = 'all' | 'open' | 'merged' | 'closed';
-
 interface FilterPrsOptions {
   author?: string | null;
   includeNumber?: boolean;