diff --git a/backend/routers/analytics.py b/backend/routers/analytics.py
index e3e3d8b..0e3b16f 100644
--- a/backend/routers/analytics.py
+++ b/backend/routers/analytics.py
@@ -100,3 +100,20 @@ def trigger_regime_detect(n_clusters: int = Query(default=4, ge=2, le=6)):
 def pattern_embeddings_summary():
     """Liste des patterns avec embedding vectoriel disponible."""
     return {"embeddings": get_all_pattern_embeddings_summary()}
+
+
+@router.delete("/purge-all")
+def purge_all_analytics():
+    """Purge all analytics history: score history, regime clusters, embeddings, cycle runs."""
+    from services.database import get_conn
+    conn = get_conn()
+    conn.execute("DELETE FROM pattern_score_history")
+    conn.execute("DELETE FROM regime_clusters")
+    conn.execute("DELETE FROM pattern_embeddings")
+    conn.execute("DELETE FROM cycle_runs")
+    conn.execute("DELETE FROM macro_regime_history")
+    conn.execute("DELETE FROM geo_alert_history")
+    n = conn.total_changes
+    conn.commit()
+    conn.close()
+    return {"deleted": n}
diff --git a/backend/routers/logs.py b/backend/routers/logs.py
index 18e36df..f81f7fc 100644
--- a/backend/routers/logs.py
+++ b/backend/routers/logs.py
@@ -73,3 +73,15 @@ def clear_old_logs(older_than_days: int = 30):
     from services.database import clear_system_logs
     deleted = clear_system_logs(older_than_days)
     return {"deleted": deleted, "older_than_days": older_than_days}
+
+
+@router.delete("/purge-all")
+def purge_all_logs():
+    """Truncate the entire system_logs table."""
+    from services.database import get_conn
+    conn = get_conn()
+    conn.execute("DELETE FROM system_logs")
+    deleted = conn.total_changes
+    conn.commit()
+    conn.close()
+    return {"deleted": deleted}
diff --git a/backend/routers/pattern_lab.py b/backend/routers/pattern_lab.py
index fc86ff1..ed74ce3 100644
--- a/backend/routers/pattern_lab.py
+++ b/backend/routers/pattern_lab.py
@@ -164,6 +164,17 @@ def get_run(run_id: str):
     return _row_to_dict(_get_run(run_id))
 
 
+@router.delete("/purge-all")
+def purge_all_runs():
+    """Delete all Pattern Lab runs."""
+    conn = get_conn()
+    conn.execute("DELETE FROM backtest_lab_runs")
+    n = conn.total_changes
+    conn.commit()
+    conn.close()
+    return {"deleted": n}
+
+
 @router.delete("/runs/{run_id}")
 def delete_run(run_id: str):
     conn = get_conn()
diff --git a/backend/routers/portfolio.py b/backend/routers/portfolio.py
index 4f57771..3386ded 100644
--- a/backend/routers/portfolio.py
+++ b/backend/routers/portfolio.py
@@ -261,6 +261,19 @@ def close_pos(pos_id: str, req: ClosePositionRequest):
     return close_position(pos_id, req.close_value)
 
 
+@router.delete("/purge-all")
+def purge_all_positions():
+    """Delete ALL portfolio positions (open + closed) and related trade entry prices."""
+    from services.database import get_conn
+    conn = get_conn()
+    conn.execute("DELETE FROM portfolio")
+    conn.execute("DELETE FROM trade_entry_prices")
+    n = conn.total_changes
+    conn.commit()
+    conn.close()
+    return {"deleted": n}
+
+
 @router.delete("/{pos_id}")
 def delete_pos(pos_id: str):
     from services.database import get_conn
diff --git a/backend/routers/reports.py b/backend/routers/reports.py
index caada2c..e3864cf 100644
--- a/backend/routers/reports.py
+++ b/backend/routers/reports.py
@@ -1,7 +1,7 @@
 from fastapi import APIRouter, HTTPException
 from services.database import (
     get_cycle_reports, get_cycle_report, get_latest_cycle_report,
-    get_trade_assessments, get_latest_trade_assessments,
+    get_trade_assessments, get_latest_trade_assessments, get_conn,
 )
 
 router = APIRouter(prefix="/api/reports", tags=["reports"])
@@ -38,3 +38,15 @@ def assessments_latest(limit: int = 20):
 def assessments_by_run(run_id: str):
     """Options technical assessments for a specific cycle run."""
     return {"assessments": get_trade_assessments(run_id)}
+
+
+@router.delete("/purge-all")
+def purge_all_reports():
+    """Delete all AI cycle reports and trade assessments."""
+    conn = get_conn()
+    conn.execute("DELETE FROM cycle_reports")
+    conn.execute("DELETE FROM ai_reports")
+    n = conn.total_changes
+    conn.commit()
+    conn.close()
+    return {"deleted": n}
diff --git a/backend/routers/var.py b/backend/routers/var.py
index b4b8b9c..ff41553 100644
--- a/backend/routers/var.py
+++ b/backend/routers/var.py
@@ -109,6 +109,19 @@ class SchedulerConfig(BaseModel):
     pnl_hours: float | None = None
 
 
+@router.delete("/purge-all")
+def purge_all_var():
+    """Delete all VaR snapshots and PnL snapshots."""
+    from services.database import get_conn
+    conn = get_conn()
+    conn.execute("DELETE FROM var_snapshots")
+    conn.execute("DELETE FROM pnl_snapshots")
+    n = conn.total_changes
+    conn.commit()
+    conn.close()
+    return {"deleted": n}
+
+
 @router.post("/scheduler/config")
 def scheduler_config(cfg: SchedulerConfig):
     if cfg.var_enabled is not None:
diff --git a/frontend/src/pages/Config.tsx b/frontend/src/pages/Config.tsx
index 07acb27..9504a60 100644
--- a/frontend/src/pages/Config.tsx
+++ b/frontend/src/pages/Config.tsx
@@ -1,7 +1,7 @@
 import { useState, useEffect } from 'react'
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { useSources, useUpdateSources, useUpdateApiKeys, useConfig, useAiStatus, useAnalysisConfig, useSaveAnalysisConfig, useCycleStatus, useUpdateCycleConfig, useTriggerCycle, useRiskProfiles, useUpsertProfile, useDeleteProfile, useExitDefaults, useSaveExitDefaults, useOptionsGate, useSaveOptionsGate, useTechIndicatorsConfig, useSaveTechIndicatorsConfig } from '../hooks/useApi'
-import { Settings, Key, Globe, CheckCircle, XCircle, AlertCircle, Save, Eye, EyeOff, Brain, SlidersHorizontal, RefreshCw, Zap, Plus, Trash2, Pencil, X, Lock, Gauge, DollarSign, TrendingUp, ShieldAlert } from 'lucide-react'
+import { Settings, Key, Globe, CheckCircle, XCircle, AlertCircle, Save, Eye, EyeOff, Brain, SlidersHorizontal, RefreshCw, Zap, Plus, Trash2, Pencil, X, Lock, Gauge, DollarSign, TrendingUp, ShieldAlert, DatabaseBackup } from 'lucide-react'
 import clsx from 'clsx'
 
 const API = ''
@@ -353,7 +353,7 @@ export default function Config() {
   const [fredKey, setFredKey] = useState('')
   const [showKeys, setShowKeys] = useState(false)
   const [savedMsg, setSavedMsg] = useState('')
-  const [configTab, setConfigTab] = useState<'ia' | 'cycle' | 'sources' | 'options' | 'profiles'>('ia')
+  const [configTab, setConfigTab] = useState<'ia' | 'cycle' | 'sources' | 'options' | 'profiles' | 'data'>('ia')
 
   // IV gate local state
   const [ivGateEnabled, setIvGateEnabled] = useState(true)
@@ -517,6 +517,7 @@ export default function Config() {
     { key: 'sources',  label: 'Sources',                icon: Globe },
     { key: 'options',  label: 'Options — Settings',     icon: TrendingUp },
     { key: 'profiles', label: 'Risk Profiles',          icon: SlidersHorizontal },
+    { key: 'data',     label: 'Data Management',        icon: DatabaseBackup },
   ] as const
 
   return (
@@ -1500,6 +1501,145 @@ export default function Config() {
       {/* ── Profils de risque ── */}
       {configTab === 'profiles' && <RiskProfilesCard />}
 
+      {/* ── Data Management ── */}
+      {configTab === 'data' && <DataManagementCard />}
+
+    </div>
+  )
+}
+
+// ── Data Management card ───────────────────────────────────────────────────────
+
+function PurgeButton({ label, description, tables, endpoint, color = 'red' }: {
+  label: string
+  description: string
+  tables: string[]
+  endpoint: string
+  color?: 'red' | 'orange'
+}) {
+  const qc = useQueryClient()
+  const [confirm, setConfirm] = useState(false)
+  const [loading, setLoading] = useState(false)
+  const [done, setDone] = useState<string | null>(null)
+
+  const handlePurge = async () => {
+    setLoading(true)
+    try {
+      const res = await fetch(endpoint, { method: 'DELETE' })
+      const data = await res.json()
+      setDone(`Deleted ${data.deleted ?? '?'} rows`)
+      setConfirm(false)
+      qc.invalidateQueries()
+    } catch (e: any) {
+      setDone(`Error: ${e?.message}`)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  const borderCol = color === 'red' ? 'border-red-800/40' : 'border-orange-800/40'
+  const bgCol     = color === 'red' ? 'bg-red-900/5'      : 'bg-orange-900/5'
+  const btnCol    = color === 'red'
+    ? 'bg-red-700 hover:bg-red-600 disabled:opacity-50'
+    : 'bg-orange-700 hover:bg-orange-600 disabled:opacity-50'
+
+  return (
+    <div className={`border ${borderCol} ${bgCol} rounded-lg p-4`}>
+      <div className="flex items-start justify-between gap-3">
+        <div className="flex-1">
+          <div className="text-sm font-semibold text-slate-200 mb-0.5">{label}</div>
+          <div className="text-xs text-slate-500 mb-1.5">{description}</div>
+          <div className="flex flex-wrap gap-1">
+            {tables.map(t => (
+              <span key={t} className="text-[10px] font-mono bg-slate-800 text-slate-400 px-1.5 py-0.5 rounded">{t}</span>
+            ))}
+          </div>
+        </div>
+        <div className="flex-shrink-0 flex flex-col items-end gap-1.5">
+          {done && <span className="text-[10px] text-emerald-400">{done}</span>}
+          {!confirm ? (
+            <button onClick={() => { setConfirm(true); setDone(null) }}
+              className={`text-xs px-3 py-1.5 rounded text-white font-semibold ${btnCol}`}>
+              <Trash2 className="w-3 h-3 inline mr-1" />Purge
+            </button>
+          ) : (
+            <div className="flex items-center gap-2">
+              <span className="text-xs text-red-400 font-semibold">Are you sure?</span>
+              <button onClick={handlePurge} disabled={loading}
+                className={`text-xs px-3 py-1.5 rounded text-white font-semibold ${btnCol}`}>
+                {loading ? 'Deleting…' : 'Yes, delete all'}
+              </button>
+              <button onClick={() => setConfirm(false)} className="text-xs text-slate-500 hover:text-slate-300">Cancel</button>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function DataManagementCard() {
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center gap-2 mb-2">
+        <DatabaseBackup className="w-4 h-4 text-red-400" />
+        <h2 className="text-base font-bold text-white">Data Management</h2>
+        <span className="text-xs text-slate-500 ml-2">Irreversible operations — all deletes are permanent</span>
+      </div>
+
+      <PurgeButton
+        label="System Logs"
+        description="Clear all system logs immediately (normally kept 30 days)."
+        tables={['system_logs']}
+        endpoint="/api/logs/purge-all"
+        color="orange"
+      />
+
+      <PurgeButton
+        label="AI Reports (Rapport IA)"
+        description="Delete all generated cycle reports and trade assessments."
+        tables={['cycle_reports', 'ai_reports']}
+        endpoint="/api/reports/purge-all"
+        color="orange"
+      />
+
+      <PurgeButton
+        label="Portfolio — All Positions"
+        description="Delete every position (open + closed) and all trade entry price history. Cannot be undone."
+        tables={['portfolio', 'trade_entry_prices']}
+        endpoint="/api/portfolio/purge-all"
+        color="red"
+      />
+
+      <PurgeButton
+        label="Analytics History"
+        description="Purge all pattern score history, regime clusters, embeddings, cycle run logs, and macro/geo alert history."
+        tables={['pattern_score_history', 'regime_clusters', 'pattern_embeddings', 'cycle_runs', 'macro_regime_history', 'geo_alert_history']}
+        endpoint="/api/analytics/purge-all"
+        color="red"
+      />
+
+      <PurgeButton
+        label="VaR & PnL Snapshots"
+        description="Delete all Value-at-Risk snapshots and daily PnL snapshots."
+        tables={['var_snapshots', 'pnl_snapshots']}
+        endpoint="/api/var/purge-all"
+        color="orange"
+      />
+
+      <PurgeButton
+        label="Pattern Lab Runs"
+        description="Delete all Pattern Lab backtest runs (event presets + instrument scans)."
+        tables={['backtest_lab_runs']}
+        endpoint="/api/pattern-lab/purge-all"
+        color="orange"
+      />
+
+      <div className="mt-2 p-3 border border-slate-700/40 rounded-lg bg-dark-700/30">
+        <p className="text-xs text-slate-500">
+          <span className="font-semibold text-slate-400">Note:</span> Custom patterns, risk profiles, config, API keys, and the Knowledge Base are managed from their respective sections and are not affected by the purges above.
+        </p>
+      </div>
     </div>
   )
 }