diff --git a/cmd/altmount/cmd/serve.go b/cmd/altmount/cmd/serve.go
index 0ae72a38b..9c63c04ac 100644
--- a/cmd/altmount/cmd/serve.go
+++ b/cmd/altmount/cmd/serve.go
@@ -178,7 +178,7 @@ func runServe(cmd *cobra.Command, args []string) error {
 	configManager.OnConfigChange(func(oldConfig, newConfig *config.Config) {
 		structuralChange := oldConfig.SegmentCache.CachePath != newConfig.SegmentCache.CachePath ||
 			oldConfig.SegmentCache.MaxSizeGB != newConfig.SegmentCache.MaxSizeGB ||
-			oldConfig.SegmentCache.ExpiryHours != newConfig.SegmentCache.ExpiryHours
+			intPtrValue(oldConfig.SegmentCache.ExpiryHours) != intPtrValue(newConfig.SegmentCache.ExpiryHours)
 
 		if !structuralChange {
 			return
@@ -439,3 +439,13 @@ func waitForHTTPServer(ctx context.Context, port int) error {
 	}
 }
 
+
+// intPtrValue returns the value pointed to by p, or 0 when p is nil. It is used
+// to compare optional integer config fields (e.g. segment cache ExpiryHours) by
+// value rather than by pointer identity.
+func intPtrValue(p *int) int {
+	if p == nil {
+		return 0
+	}
+	return *p
+}
diff --git a/cmd/altmount/cmd/setup.go b/cmd/altmount/cmd/setup.go
index 50846f61a..54357cdf6 100644
--- a/cmd/altmount/cmd/setup.go
+++ b/cmd/altmount/cmd/setup.go
@@ -315,10 +315,18 @@ func initializeSegmentCache(ctx context.Context, cfg *config.Config, source *seg
 		return nil
 	}
 
+	// ExpiryHours is normalized in config.Validate (nil -> 24h); guard against
+	// nil defensively in case the cache is initialized outside the load path. A
+	// zero value is preserved and means "cache forever".
+	expiryHours := 24
+	if cfg.SegmentCache.ExpiryHours != nil {
+		expiryHours = *cfg.SegmentCache.ExpiryHours
+	}
+
 	mgrCfg := segcache.ManagerConfig{
 		CachePath:      cfg.SegmentCache.CachePath,
 		MaxSizeBytes:   int64(cfg.SegmentCache.MaxSizeGB) * 1024 * 1024 * 1024,
-		ExpiryDuration: time.Duration(cfg.SegmentCache.ExpiryHours) * time.Hour,
+		ExpiryDuration: time.Duration(expiryHours) * time.Hour,
 	}.WithDefaults()
 
 	mgr, err := segcache.NewManager(mgrCfg, slog.Default().With("component", "segcache"))
diff --git a/frontend/src/components/config/StreamingConfigSection.tsx b/frontend/src/components/config/StreamingConfigSection.tsx
index 502f713de..4d3612898 100644
--- a/frontend/src/components/config/StreamingConfigSection.tsx
+++ b/frontend/src/components/config/StreamingConfigSection.tsx
@@ -131,7 +131,8 @@ export function StreamingConfigSection({
 						<div className="min-w-0">
 							<h4 className="font-bold text-base-content text-sm">Playback Failure Masking</h4>
 							<p className="mt-1 break-words text-[11px] text-base-content/50 leading-relaxed">
-								Debounce transient streaming errors (like propagation delays) by requiring multiple consecutive playback failures before triggering a redownload.
+								Debounce transient streaming errors (like propagation delays) by requiring multiple
+								consecutive playback failures before triggering a redownload.
 							</p>
 						</div>
 						<input
@@ -159,14 +160,17 @@ export function StreamingConfigSection({
 								<div className="min-w-0">
 									<h5 className="font-bold text-base-content text-xs">Failure Threshold</h5>
 									<p className="mt-1 break-words text-[10px] text-base-content/50 leading-relaxed">
-										Number of consecutive failures required before declaring a file corrupted and requesting repair.
+										Number of consecutive failures required before declaring a file corrupted and
+										requesting repair.
 									</p>
 								</div>
 								<div className="flex shrink-0 items-center gap-3">
-									<span className="font-black font-mono text-primary text-lg">
+									<span className="font-black font-mono text-lg text-primary">
 										{streamingData.failure_masking?.threshold ?? 3}
 									</span>
-									<span className="font-bold text-base-content/60 text-[10px] uppercase">failures</span>
+									<span className="font-bold text-[10px] text-base-content/60 uppercase">
+										failures
+									</span>
 								</div>
 							</div>
 							<input
@@ -189,7 +193,7 @@ export function StreamingConfigSection({
 									checkChanges(newData, cacheData);
 								}}
 							/>
-							<div className="flex justify-between px-1 font-black text-base-content/50 text-[10px]">
+							<div className="flex justify-between px-1 font-black text-[10px] text-base-content/50">
 								<span>1</span>
 								<span>3</span>
 								<span>5</span>
@@ -300,21 +304,30 @@ export function StreamingConfigSection({
 										Cache Expiry
 									</h4>
 									<p className="mt-1 break-words text-[11px] text-base-content/50 leading-relaxed">
-										How long cached segments are kept before automatic eviction.
+										How long cached segments are kept before automatic eviction. Set to 0 to keep
+										them forever (bounded only by the maximum cache size).
 									</p>
 								</div>
 								<div className="mt-1 flex shrink-0 items-center justify-start gap-3 sm:mt-0 sm:justify-end">
-									<span className="font-black font-mono text-primary text-xl">
-										{cacheData.expiry_hours}
-									</span>
-									<span className="font-bold text-base-content/60 text-xs uppercase">hours</span>
+									{cacheData.expiry_hours === 0 ? (
+										<span className="font-black font-mono text-primary text-xl">Forever</span>
+									) : (
+										<>
+											<span className="font-black font-mono text-primary text-xl">
+												{cacheData.expiry_hours}
+											</span>
+											<span className="font-bold text-base-content/60 text-xs uppercase">
+												hours
+											</span>
+										</>
+									)}
 								</div>
 							</div>
 
 							<div className="space-y-4">
 								<input
 									type="range"
-									min="1"
+									min="0"
 									max="168"
 									value={cacheData.expiry_hours}
 									step="1"
@@ -325,7 +338,7 @@ export function StreamingConfigSection({
 									}
 								/>
 								<div className="flex justify-between px-2 font-black text-base-content/50 text-xs">
-									<span>1h</span>
+									<span>Forever</span>
 									<span>42h</span>
 									<span>84h</span>
 									<span>126h</span>
diff --git a/frontend/src/components/system/ProviderStatusTable.tsx b/frontend/src/components/system/ProviderStatusTable.tsx
index 66de8d6ed..99a1fdfd7 100644
--- a/frontend/src/components/system/ProviderStatusTable.tsx
+++ b/frontend/src/components/system/ProviderStatusTable.tsx
@@ -492,8 +492,9 @@ export function ProviderStatusTable({
 												)}
 												{hasQuota && (
 													<div className="mt-1.5 border-base-200/60 border-t pt-1 text-[10px]">
-														<div className="font-semibold font-mono text-warning">
-															Quota: {formatBytes(provider.quota_used || 0, 2, false, true)} / {formatBytes(provider.quota_bytes || 0, 2, false, true)}
+														<div className="font-mono font-semibold text-warning">
+															Quota: {formatBytes(provider.quota_used || 0, 2, false, true)} /{" "}
+															{formatBytes(provider.quota_bytes || 0, 2, false, true)}
 														</div>
 														{provider.quota_reset_at && (
 															<div className="mt-0.5 font-mono text-base-content/40">
diff --git a/frontend/src/pages/HealthPage.tsx b/frontend/src/pages/HealthPage.tsx
index 8dcdde464..338ed69c7 100644
--- a/frontend/src/pages/HealthPage.tsx
+++ b/frontend/src/pages/HealthPage.tsx
@@ -1,8 +1,8 @@
-import { apiClient } from "../api/client";
 import { useQueryClient } from "@tanstack/react-query";
 import { FileCheck, RefreshCw, RotateCcw, Settings, ShieldCheck, Trash2 } from "lucide-react";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useNavigate, useParams } from "react-router-dom";
+import { apiClient } from "../api/client";
 import { ErrorAlert } from "../components/ui/ErrorAlert";
 import { Pagination } from "../components/ui/Pagination";
 import { useConfirm } from "../contexts/ModalContext";
diff --git a/frontend/src/pages/HealthPage/components/HealthTable/HealthTable.tsx b/frontend/src/pages/HealthPage/components/HealthTable/HealthTable.tsx
index 2372126bf..99e2dcfac 100644
--- a/frontend/src/pages/HealthPage/components/HealthTable/HealthTable.tsx
+++ b/frontend/src/pages/HealthPage/components/HealthTable/HealthTable.tsx
@@ -108,7 +108,12 @@ export function HealthTable({
 									onSelectAll={onSelectAll}
 									onSelectAllPages={onSelectAllPages}
 									onSort={onSort}
-									allowSelectAllPages={["pending", "checking", "corrupted", "repair_triggered"].includes(statusFilter)}
+									allowSelectAllPages={[
+										"pending",
+										"checking",
+										"corrupted",
+										"repair_triggered",
+									].includes(statusFilter)}
 								/>
 								<tbody>
 									{data.map((item: FileHealth) => (
diff --git a/frontend/src/pages/HealthPage/components/HealthTable/HealthTableHeader.tsx b/frontend/src/pages/HealthPage/components/HealthTable/HealthTableHeader.tsx
index 319dd2b2e..d18030572 100644
--- a/frontend/src/pages/HealthPage/components/HealthTable/HealthTableHeader.tsx
+++ b/frontend/src/pages/HealthPage/components/HealthTable/HealthTableHeader.tsx
@@ -27,7 +27,7 @@ export function HealthTableHeader({
 			<tr>
 				<th className="w-16">
 					<div className="dropdown">
-						<label tabIndex={0} className="cursor-pointer flex items-center gap-1">
+						<label className="flex cursor-pointer items-center gap-1">
 							<input
 								type="checkbox"
 								className="checkbox checkbox-sm"
@@ -39,10 +39,7 @@ export function HealthTableHeader({
 							/>
 							<ChevronDown className="h-3 w-3" />
 						</label>
-						<ul
-							tabIndex={0}
-							className="dropdown-content z-[1] menu p-2 shadow bg-base-100 rounded-box w-52"
-						>
+						<ul className="dropdown-content menu z-[1] w-52 rounded-box bg-base-100 p-2 shadow">
 							<li>
 								<button type="button" onClick={() => onSelectAll(true)}>
 									Select all on page
diff --git a/frontend/src/pages/QueuePage.tsx b/frontend/src/pages/QueuePage.tsx
index 15c5ad351..f14a00a7b 100644
--- a/frontend/src/pages/QueuePage.tsx
+++ b/frontend/src/pages/QueuePage.tsx
@@ -1,4 +1,3 @@
-import { apiClient } from "../api/client";
 import { useQueryClient } from "@tanstack/react-query";
 import {
 	Activity,
@@ -28,6 +27,7 @@ import {
 	XOctagon,
 } from "lucide-react";
 import { useCallback, useMemo, useState } from "react";
+import { apiClient } from "../api/client";
 import { ImportMethods } from "../components/queue/ImportMethods";
 import { QueueItemCard } from "../components/queue/QueueItemCard";
 import { ErrorAlert } from "../components/ui/ErrorAlert";
@@ -778,10 +778,7 @@ export function QueuePage() {
 														<tr>
 															<th className="w-16">
 																<div className="dropdown">
-																	<label
-																		tabIndex={0}
-																		className="cursor-pointer flex items-center gap-1"
-																	>
+																	<label className="flex cursor-pointer items-center gap-1">
 																		<input
 																			type="checkbox"
 																			className="checkbox checkbox-sm"
@@ -793,10 +790,7 @@ export function QueuePage() {
 																		/>
 																		<ChevronDown className="h-3 w-3" />
 																	</label>
-																	<ul
-																		tabIndex={0}
-																		className="dropdown-content z-[1] menu p-2 shadow bg-base-100 rounded-box w-52"
-																	>
+																	<ul className="dropdown-content menu z-[1] w-52 rounded-box bg-base-100 p-2 shadow">
 																		<li>
 																			<button type="button" onClick={() => handleSelectAll(true)}>
 																				Select all on page
diff --git a/internal/config/manager.go b/internal/config/manager.go
index f3581cb72..2678d8343 100644
--- a/internal/config/manager.go
+++ b/internal/config/manager.go
@@ -92,10 +92,13 @@ func (n NetworkConfig) GetNoProxy() string { return n.NoProxy }
 // When enabled, this cache replaces the FUSE VFS disk cache and additionally benefits WebDAV.
 // Cache key: Usenet message ID. Cache unit: ~750KB decoded segment (matches one NNTP article).
 type SegmentCacheConfig struct {
-	Enabled     *bool  `yaml:"enabled" mapstructure:"enabled" json:"enabled"`
-	CachePath   string `yaml:"cache_path" mapstructure:"cache_path" json:"cache_path"`
-	MaxSizeGB   int    `yaml:"max_size_gb" mapstructure:"max_size_gb" json:"max_size_gb"`
-	ExpiryHours int    `yaml:"expiry_hours" mapstructure:"expiry_hours" json:"expiry_hours"`
+	Enabled   *bool  `yaml:"enabled" mapstructure:"enabled" json:"enabled"`
+	CachePath string `yaml:"cache_path" mapstructure:"cache_path" json:"cache_path"`
+	MaxSizeGB int    `yaml:"max_size_gb" mapstructure:"max_size_gb" json:"max_size_gb"`
+	// ExpiryHours controls how long cached segments are kept before automatic
+	// eviction. Set to 0 to disable expiry (cache forever, bounded only by
+	// MaxSizeGB via LRU eviction). Left unset (nil) it defaults to 24 hours.
+	ExpiryHours *int `yaml:"expiry_hours" mapstructure:"expiry_hours" json:"expiry_hours"`
 }
 
 // WebDAVConfig represents WebDAV server configuration
@@ -662,6 +665,14 @@ func (c *Config) Validate() error {
 		c.Streaming.MaxPrefetch = 60 // Default to 60 segments prefetched ahead if not set
 	}
 
+	// Segment cache expiry: nil (unset) defaults to 24 hours; an explicit 0 is
+	// preserved and means "cache forever" (bounded only by the size cap). A
+	// pointer is used so unset and explicit-0 can be distinguished.
+	if c.SegmentCache.ExpiryHours == nil {
+		defaultExpiryHours := 24
+		c.SegmentCache.ExpiryHours = &defaultExpiryHours
+	}
+
 	if c.Import.MaxProcessorWorkers <= 0 {
 		return fmt.Errorf("import max_processor_workers must be greater than 0")
 	}
diff --git a/internal/nzbfilesystem/segcache/manager.go b/internal/nzbfilesystem/segcache/manager.go
index 967a72b60..a02bd0c6b 100644
--- a/internal/nzbfilesystem/segcache/manager.go
+++ b/internal/nzbfilesystem/segcache/manager.go
@@ -27,6 +27,11 @@ func DefaultManagerConfig() ManagerConfig {
 }
 
 // WithDefaults returns a copy with zero values replaced by defaults.
+//
+// ExpiryDuration is intentionally NOT defaulted here: a zero (or negative)
+// duration means "cache forever" (see SegmentCache.Cleanup), and the expiry
+// default is applied upstream in config.Validate. Overriding it here would make
+// an explicit "forever" setting impossible.
 func (cfg ManagerConfig) WithDefaults() ManagerConfig {
 	defaults := DefaultManagerConfig()
 	if cfg.CachePath == "" {
@@ -35,9 +40,6 @@ func (cfg ManagerConfig) WithDefaults() ManagerConfig {
 	if cfg.MaxSizeBytes <= 0 {
 		cfg.MaxSizeBytes = defaults.MaxSizeBytes
 	}
-	if cfg.ExpiryDuration <= 0 {
-		cfg.ExpiryDuration = defaults.ExpiryDuration
-	}
 	return cfg
 }