diff --git a/CHANGELOG.md b/CHANGELOG.md
index f050535..310086d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ## [Unreleased]
 
+## [0.9.0-alpha] - 2026-02-21
+
+### Added
+
+- **Data retention settings (PULSE-58).** Site owners can choose how long raw event data is kept (1 month to 3 years depending on plan). Events older than the retention period are automatically deleted every 24 hours. Aggregated daily stats are preserved so historical charts remain intact.
+- **Data Retention section in Site Settings.** Under Data & Privacy, a dropdown lets you set retention; options are capped by your plan (free: up to 6 months, solo: 1 year, team: 2 years, business: 3 years).
+- **Privacy snippet includes retention.** The generated privacy policy text now mentions when raw data is automatically deleted.
+
 ## [0.8.0-alpha] - 2026-02-20
 
 ### Added
@@ -104,7 +112,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ---
 
-[Unreleased]: https://github.com/ciphera-net/pulse/compare/v0.8.0-alpha...HEAD
+[Unreleased]: https://github.com/ciphera-net/pulse/compare/v0.9.0-alpha...HEAD
+[0.9.0-alpha]: https://github.com/ciphera-net/pulse/compare/v0.8.0-alpha...v0.9.0-alpha
 [0.8.0-alpha]: https://github.com/ciphera-net/pulse/compare/v0.7.0-alpha...v0.8.0-alpha
 [0.7.0-alpha]: https://github.com/ciphera-net/pulse/compare/v0.6.0-alpha...v0.7.0-alpha
 [0.6.0-alpha]: https://github.com/ciphera-net/pulse/compare/v0.5.1-alpha...v0.6.0-alpha
diff --git a/app/sites/[id]/settings/page.tsx b/app/sites/[id]/settings/page.tsx
index c537b68..778ea6b 100644
--- a/app/sites/[id]/settings/page.tsx
+++ b/app/sites/[id]/settings/page.tsx
@@ -13,6 +13,8 @@ import { PasswordInput } from '@ciphera-net/ui'
 import { Select, Modal, Button } from '@ciphera-net/ui'
 import { APP_URL } from '@/lib/api/client'
 import { generatePrivacySnippet } from '@/lib/utils/privacySnippet'
+import { getSubscription, type SubscriptionDetails } from '@/lib/api/billing'
+import { getRetentionOptionsForPlan, formatRetentionMonths } from '@/lib/plans'
 import { motion, AnimatePresence } from 'framer-motion'
 import { useAuth } from '@/lib/auth/context'
 import {
@@ -68,8 +70,12 @@ export default function SiteSettingsPage() {
     // Performance insights setting
     enable_performance_insights: false,
     // Bot and noise filtering
-    filter_bots: true
+    filter_bots: true,
+    // Data retention (6 = free-tier max; safe default)
+    data_retention_months: 6
   })
+  const [subscription, setSubscription] = useState<SubscriptionDetails | null>(null)
+  const [subscriptionLoadFailed, setSubscriptionLoadFailed] = useState(false)
   const [linkCopied, setLinkCopied] = useState(false)
   const [snippetCopied, setSnippetCopied] = useState(false)
   const [showVerificationModal, setShowVerificationModal] = useState(false)
@@ -83,6 +89,7 @@ export default function SiteSettingsPage() {
 
   useEffect(() => {
     loadSite()
+    loadSubscription()
   }, [siteId])
 
   useEffect(() => {
@@ -91,6 +98,30 @@ export default function SiteSettingsPage() {
     }
   }, [activeTab, siteId])
 
+  const loadSubscription = async () => {
+    try {
+      setSubscriptionLoadFailed(false)
+      const sub = await getSubscription()
+      setSubscription(sub)
+    } catch (e) {
+      setSubscriptionLoadFailed(true)
+      toast.error(getAuthErrorMessage(e as Error) || 'Could not load plan limits. Showing default options.')
+    }
+  }
+
+  // * Snap data_retention_months to nearest valid option when subscription loads
+  useEffect(() => {
+    if (!subscription) return
+    const opts = getRetentionOptionsForPlan(subscription.plan_id)
+    const values = opts.map(o => o.value)
+    const maxVal = Math.max(...values)
+    setFormData(prev => {
+      if (values.includes(prev.data_retention_months)) return prev
+      const bestFit = values.filter(v => v <= prev.data_retention_months).pop() ?? maxVal
+      return { ...prev, data_retention_months: Math.min(bestFit, maxVal) }
+    })
+  }, [subscription])
+
   const loadSite = async () => {
     try {
       setLoading(true)
@@ -111,7 +142,9 @@ export default function SiteSettingsPage() {
         // Performance insights setting (default to false)
         enable_performance_insights: data.enable_performance_insights ?? false,
         // Bot and noise filtering (default to true)
-        filter_bots: data.filter_bots ?? true
+        filter_bots: data.filter_bots ?? true,
+        // Data retention (default 6 = free-tier max; avoids flash-then-clamp for existing sites)
+        data_retention_months: data.data_retention_months ?? 6
       })
       if (data.has_password) {
         setIsPasswordEnabled(true)
@@ -226,7 +259,9 @@ export default function SiteSettingsPage() {
         // Performance insights setting
         enable_performance_insights: formData.enable_performance_insights,
         // Bot and noise filtering
-        filter_bots: formData.filter_bots
+        filter_bots: formData.filter_bots,
+        // Data retention
+        data_retention_months: formData.data_retention_months
       })
       toast.success('Site updated successfully')
       loadSite()
@@ -821,6 +856,58 @@ export default function SiteSettingsPage() {
                     </div>
                   </div>
 
+                  {/* Data Retention */}
+                  <div className="space-y-4 pt-6 border-t border-neutral-100 dark:border-neutral-800">
+                    <h3 className="text-sm font-medium text-neutral-700 dark:text-neutral-300">Data Retention</h3>
+                    {subscriptionLoadFailed && (
+                      <div className="p-3 rounded-xl border border-amber-200 dark:border-amber-800 bg-amber-50 dark:bg-amber-900/20 flex items-center justify-between gap-3">
+                        <p className="text-sm text-amber-800 dark:text-amber-200">
+                          Plan limits could not be loaded. Options shown may be limited.
+                        </p>
+                        <button
+                          type="button"
+                          onClick={loadSubscription}
+                          className="shrink-0 text-sm font-medium text-amber-800 dark:text-amber-200 hover:underline"
+                        >
+                          Retry
+                        </button>
+                      </div>
+                    )}
+                    <div className="p-4 bg-neutral-50 dark:bg-neutral-900/50 rounded-2xl border border-neutral-100 dark:border-neutral-800">
+                      <div className="flex items-center justify-between">
+                        <div>
+                          <h4 className="font-medium text-neutral-900 dark:text-white">Keep raw event data for</h4>
+                          <p className="text-sm text-neutral-500 dark:text-neutral-400 mt-0.5">
+                            Events older than this are automatically deleted. Aggregated daily stats are kept permanently.
+                          </p>
+                        </div>
+                        <Select
+                          value={String(formData.data_retention_months)}
+                          onChange={(v) => setFormData({ ...formData, data_retention_months: Number(v) })}
+                          options={getRetentionOptionsForPlan(subscription?.plan_id).map(opt => ({
+                            value: String(opt.value),
+                            label: opt.label,
+                          }))}
+                          variant="input"
+                          align="right"
+                          className="min-w-[160px]"
+                        />
+                      </div>
+                      {subscription?.plan_id && subscription.plan_id !== 'free' && (
+                        <p className="text-xs text-neutral-400 dark:text-neutral-500 mt-3">
+                          Your {subscription.plan_id} plan supports up to {formatRetentionMonths(
+                            getRetentionOptionsForPlan(subscription.plan_id).at(-1)?.value ?? 6
+                          )} of data retention.
+                        </p>
+                      )}
+                      {(!subscription?.plan_id || subscription.plan_id === 'free') && (
+                        <p className="text-xs text-neutral-400 dark:text-neutral-500 mt-3">
+                          Free plan supports up to 6 months. <a href="/pricing" className="text-brand-orange hover:underline">Upgrade</a> for longer retention.
+                        </p>
+                      )}
+                    </div>
+                  </div>
+
                   {/* Excluded Paths */}
                   <div className="space-y-4 pt-6 border-t border-neutral-100 dark:border-neutral-800">
                     <h3 className="text-sm font-medium text-neutral-700 dark:text-neutral-300">Path Filtering</h3>
diff --git a/lib/api/sites.ts b/lib/api/sites.ts
index cbd6604..75157cf 100644
--- a/lib/api/sites.ts
+++ b/lib/api/sites.ts
@@ -21,6 +21,8 @@ export interface Site {
   enable_performance_insights?: boolean
   // Bot and noise filtering
   filter_bots?: boolean
+  // Data retention (months); 0 = keep forever
+  data_retention_months?: number
   created_at: string
   updated_at: string
 }
@@ -47,6 +49,8 @@ export interface UpdateSiteRequest {
   enable_performance_insights?: boolean
   // Bot and noise filtering
   filter_bots?: boolean
+  // Data retention (months); 0 = keep forever
+  data_retention_months?: number
 }
 
 export async function listSites(): Promise<Site[]> {
diff --git a/lib/plans.ts b/lib/plans.ts
index eb460b3..5456837 100644
--- a/lib/plans.ts
+++ b/lib/plans.ts
@@ -40,3 +40,42 @@ export function getLimitForTierIndex(index: number): number {
   if (index < 0 || index >= TRAFFIC_TIERS.length) return 100000
   return TRAFFIC_TIERS[index].value
 }
+
+/** Maximum data retention (months) allowed per plan. */
+export function getMaxRetentionMonthsForPlan(planId: string | null | undefined): number {
+  switch (planId) {
+    case 'business': return 36
+    case 'team': return 24
+    case 'solo': return 12
+    default: return 6
+  }
+}
+
+/** Selectable retention options (months) for the given plan. */
+export function getRetentionOptionsForPlan(planId: string | null | undefined): { label: string; value: number }[] {
+  const base = [
+    { label: '1 month', value: 1 },
+    { label: '3 months', value: 3 },
+    { label: '6 months', value: 6 },
+  ]
+  const solo = [...base, { label: '1 year', value: 12 }]
+  const team = [...solo, { label: '2 years', value: 24 }]
+  const business = [...team, { label: '3 years', value: 36 }]
+
+  switch (planId) {
+    case 'business': return business
+    case 'team': return team
+    case 'solo': return solo
+    default: return base
+  }
+}
+
+/** Human-readable label for a retention value in months. */
+export function formatRetentionMonths(months: number): string {
+  if (months === 0) return 'Forever'
+  if (months === 1) return '1 month'
+  if (months < 12) return `${months} months`
+  const years = months / 12
+  if (Number.isInteger(years)) return years === 1 ? '1 year' : `${years} years`
+  return `${months} months`
+}
diff --git a/lib/utils/privacySnippet.ts b/lib/utils/privacySnippet.ts
index 12ffe75..36dad18 100644
--- a/lib/utils/privacySnippet.ts
+++ b/lib/utils/privacySnippet.ts
@@ -1,4 +1,5 @@
 import type { Site } from '@/lib/api/sites'
+import { formatRetentionMonths } from '@/lib/plans'
 
 const DOCS_URL =
   (typeof process !== 'undefined' && process.env?.NEXT_PUBLIC_APP_URL)
@@ -22,6 +23,7 @@ export function generatePrivacySnippet(site: Site): string {
   const screen = site.collect_screen_resolution ?? true
   const perf = site.enable_performance_insights ?? false
   const filterBots = site.filter_bots ?? true
+  const retentionMonths = site.data_retention_months ?? 6
 
   const parts: string[] = []
   if (paths) parts.push('which pages are viewed')
@@ -44,6 +46,9 @@ export function generatePrivacySnippet(site: Site): string {
   if (filterBots) {
     p2 += 'Known bots and referrer spam are excluded from our analytics. '
   }
+  if (retentionMonths > 0) {
+    p2 += `Raw event data is automatically deleted after ${formatRetentionMonths(retentionMonths)}. `
+  }
   p2 += `Data is processed in a privacy-preserving way and is not used to identify individuals. For more information, see Pulse's documentation: ${DOCS_URL}`
 
   return `${p1}\n\n${p2}`
diff --git a/package.json b/package.json
index 6900890..8ed7d8a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pulse-frontend",
-  "version": "0.8.0-alpha",
+  "version": "0.9.0-alpha",
   "private": true,
   "scripts": {
     "dev": "next dev",