diff --git a/app/api/banking/transactions/deduplicate/route.ts b/app/api/banking/transactions/deduplicate/route.ts
new file mode 100644
index 0000000..82db1e1
--- /dev/null
+++ b/app/api/banking/transactions/deduplicate/route.ts
@@ -0,0 +1,20 @@
+import { NextResponse } from "next/server";
+import { transactionService } from "@/services/transaction.service";
+import { requireAuth } from "@/lib/auth-utils";
+
+export async function POST() {
+  const authError = await requireAuth();
+  if (authError) return authError;
+
+  try {
+    const result = await transactionService.deduplicate();
+    return NextResponse.json(result);
+  } catch (error) {
+    console.error("Error deduplicating transactions:", error);
+    return NextResponse.json(
+      { error: "Failed to deduplicate transactions" },
+      { status: 500 }
+    );
+  }
+}
+
diff --git a/app/settings/page.tsx b/app/settings/page.tsx
index d1413a8..131d0e5 100644
--- a/app/settings/page.tsx
+++ b/app/settings/page.tsx
@@ -89,6 +89,24 @@ export default function SettingsPage() {
     }
   };
 
+  const deduplicateTransactions = async () => {
+    try {
+      const response = await fetch(
+        "/api/banking/transactions/deduplicate",
+        {
+          method: "POST",
+        }
+      );
+      if (!response.ok) throw new Error("Erreur");
+      const result = await response.json();
+      refresh();
+      return result;
+    } catch (error) {
+      console.error(error);
+      throw error;
+    }
+  };
+
   const categorizedCount = data.transactions.filter((t) => t.categoryId).length;
 
   return (
@@ -114,6 +132,7 @@ export default function SettingsPage() {
           categorizedCount={categorizedCount}
           onClearCategories={clearAllCategories}
           onResetData={resetData}
+          onDeduplicate={deduplicateTransactions}
         />
 
         <OFXInfoCard />
diff --git a/app/statistics/page.tsx b/app/statistics/page.tsx
index cc9cf7e..f031af8 100644
--- a/app/statistics/page.tsx
+++ b/app/statistics/page.tsx
@@ -23,6 +23,7 @@ import { CategoryFilterCombobox } from "@/components/ui/category-filter-combobox
 import { Card, CardContent } from "@/components/ui/card";
 import { Badge } from "@/components/ui/badge";
 import { CategoryIcon } from "@/components/ui/category-icon";
+import { Checkbox } from "@/components/ui/checkbox";
 import { Filter, X, Wallet, CircleSlash, Calendar } from "lucide-react";
 import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
 import { Calendar as CalendarComponent } from "@/components/ui/calendar";
@@ -38,6 +39,7 @@ export default function StatisticsPage() {
   const [period, setPeriod] = useState<Period>("6months");
   const [selectedAccounts, setSelectedAccounts] = useState<string[]>(["all"]);
   const [selectedCategories, setSelectedCategories] = useState<string[]>(["all"]);
+  const [excludeInternalTransfers, setExcludeInternalTransfers] = useState(true);
   const [customStartDate, setCustomStartDate] = useState<Date | undefined>(undefined);
   const [customEndDate, setCustomEndDate] = useState<Date | undefined>(undefined);
   const [isCustomDatePickerOpen, setIsCustomDatePickerOpen] = useState(false);
@@ -69,6 +71,14 @@ export default function StatisticsPage() {
     return undefined;
   }, [period, customEndDate]);
 
+  // Find "Virement interne" category
+  const internalTransferCategory = useMemo(() => {
+    if (!data) return null;
+    return data.categories.find(
+      (c) => c.name.toLowerCase() === "virement interne"
+    );
+  }, [data]);
+
   // Transactions filtered for account filter (by categories, period - not accounts)
   const transactionsForAccountFilter = useMemo(() => {
     if (!data) return [];
@@ -98,8 +108,14 @@ export default function StatisticsPage() {
         }
       }
       return true;
+    }).filter((t) => {
+      // Exclude "Virement interne" category if checkbox is checked
+      if (excludeInternalTransfers && internalTransferCategory) {
+        return t.categoryId !== internalTransferCategory.id;
+      }
+      return true;
     });
-  }, [data, startDate, endDate, selectedCategories]);
+  }, [data, startDate, endDate, selectedCategories, excludeInternalTransfers, internalTransferCategory]);
 
   // Transactions filtered for category filter (by accounts, period - not categories)
   const transactionsForCategoryFilter = useMemo(() => {
@@ -126,8 +142,14 @@ export default function StatisticsPage() {
         return selectedAccounts.includes(t.accountId);
       }
       return true;
+    }).filter((t) => {
+      // Exclude "Virement interne" category if checkbox is checked
+      if (excludeInternalTransfers && internalTransferCategory) {
+        return t.categoryId !== internalTransferCategory.id;
+      }
+      return true;
     });
-  }, [data, startDate, endDate, selectedAccounts]);
+  }, [data, startDate, endDate, selectedAccounts, excludeInternalTransfers, internalTransferCategory]);
 
   const stats = useMemo(() => {
     if (!data) return null;
@@ -163,6 +185,13 @@ export default function StatisticsPage() {
       }
     }
 
+    // Exclude "Virement interne" category if checkbox is checked
+    if (excludeInternalTransfers && internalTransferCategory) {
+      transactions = transactions.filter(
+        (t) => t.categoryId !== internalTransferCategory.id
+      );
+    }
+
     // Monthly breakdown
     const monthlyData = new Map<string, { income: number; expenses: number }>();
     transactions.forEach((t) => {
@@ -211,10 +240,20 @@ export default function StatisticsPage() {
       .sort((a, b) => b.value - a.value)
       .slice(0, 8);
 
-    // Top expenses
-    const topExpenses = transactions
+    // Top expenses - deduplicate by ID and sort by amount (most negative first)
+    const uniqueTransactions = Array.from(
+      new Map(transactions.map((t) => [t.id, t])).values()
+    );
+    const topExpenses = uniqueTransactions
       .filter((t) => t.amount < 0)
-      .sort((a, b) => a.amount - b.amount)
+      .sort((a, b) => {
+        // Sort by amount (most negative first)
+        if (a.amount !== b.amount) {
+          return a.amount - b.amount;
+        }
+        // If same amount, sort by date (most recent first) for stable sorting
+        return new Date(b.date).getTime() - new Date(a.date).getTime();
+      })
       .slice(0, 5);
 
     // Summary
@@ -259,6 +298,10 @@ export default function StatisticsPage() {
               return false;
           }
         }
+        // Exclude "Virement interne" category if checkbox is checked
+        if (excludeInternalTransfers && internalTransferCategory) {
+          if (t.categoryId === internalTransferCategory.id) return false;
+        }
         // Only transactions before startDate
         const transactionDate = new Date(t.date);
         return transactionDate < startDate;
@@ -308,6 +351,10 @@ export default function StatisticsPage() {
                 return false;
             }
           }
+          // Exclude "Virement interne" category if checkbox is checked
+          if (excludeInternalTransfers && internalTransferCategory) {
+            if (t.categoryId === internalTransferCategory.id) return false;
+          }
           const transactionDate = new Date(t.date);
           return transactionDate < startDate;
         })
@@ -373,7 +420,7 @@ export default function StatisticsPage() {
       perAccountBalanceData,
       transactionCount: transactions.length,
     };
-  }, [data, startDate, endDate, selectedAccounts, selectedCategories]);
+  }, [data, startDate, endDate, selectedAccounts, selectedCategories, excludeInternalTransfers, internalTransferCategory]);
 
   const formatCurrency = (amount: number) => {
     return new Intl.NumberFormat("fr-FR", {
@@ -517,6 +564,22 @@ export default function StatisticsPage() {
                 </PopoverContent>
               </Popover>
             )}
+
+            {internalTransferCategory && (
+              <div className="flex items-center gap-2 px-3 py-2 border border-border rounded-md bg-[var(--card)]">
+                <Checkbox
+                  id="exclude-internal-transfers"
+                  checked={excludeInternalTransfers}
+                  onCheckedChange={(checked) => setExcludeInternalTransfers(checked === true)}
+                />
+                <label
+                  htmlFor="exclude-internal-transfers"
+                  className="text-sm font-medium cursor-pointer select-none"
+                >
+                  Exclure Virement interne
+                </label>
+              </div>
+            )}
           </div>
 
           <ActiveFilters
diff --git a/app/transactions/page.tsx b/app/transactions/page.tsx
index ed551a3..ea06f9a 100644
--- a/app/transactions/page.tsx
+++ b/app/transactions/page.tsx
@@ -19,9 +19,12 @@ import {
   normalizeDescription,
   suggestKeyword,
 } from "@/components/rules/constants";
+import { format } from "date-fns";
+import { fr } from "date-fns/locale";
 
 type SortField = "date" | "amount" | "description";
 type SortOrder = "asc" | "desc";
+type Period = "1month" | "3months" | "6months" | "12months" | "custom" | "all";
 
 export default function TransactionsPage() {
   const searchParams = useSearchParams();
@@ -38,6 +41,10 @@ export default function TransactionsPage() {
 
   const [selectedCategories, setSelectedCategories] = useState<string[]>(["all"]);
   const [showReconciled, setShowReconciled] = useState<string>("all");
+  const [period, setPeriod] = useState<Period>("all");
+  const [customStartDate, setCustomStartDate] = useState<Date | undefined>(undefined);
+  const [customEndDate, setCustomEndDate] = useState<Date | undefined>(undefined);
+  const [isCustomDatePickerOpen, setIsCustomDatePickerOpen] = useState(false);
   const [sortField, setSortField] = useState<SortField>("date");
   const [sortOrder, setSortOrder] = useState<SortOrder>("desc");
   const [selectedTransactions, setSelectedTransactions] = useState<Set<string>>(
@@ -46,12 +53,54 @@ export default function TransactionsPage() {
   const [ruleDialogOpen, setRuleDialogOpen] = useState(false);
   const [ruleTransaction, setRuleTransaction] = useState<Transaction | null>(null);
 
-  // Transactions filtered for account filter (by categories, search, reconciled - not accounts)
+  // Get start date based on period
+  const startDate = useMemo(() => {
+    const now = new Date();
+    switch (period) {
+      case "1month":
+        return new Date(now.getFullYear(), now.getMonth() - 1, 1);
+      case "3months":
+        return new Date(now.getFullYear(), now.getMonth() - 3, 1);
+      case "6months":
+        return new Date(now.getFullYear(), now.getMonth() - 6, 1);
+      case "12months":
+        return new Date(now.getFullYear(), now.getMonth() - 12, 1);
+      case "custom":
+        return customStartDate || new Date(0);
+      default:
+        return new Date(0);
+    }
+  }, [period, customStartDate]);
+
+  // Get end date (only for custom period)
+  const endDate = useMemo(() => {
+    if (period === "custom" && customEndDate) {
+      return customEndDate;
+    }
+    return undefined;
+  }, [period, customEndDate]);
+
+  // Transactions filtered for account filter (by categories, search, reconciled, period - not accounts)
   const transactionsForAccountFilter = useMemo(() => {
     if (!data) return [];
 
     let transactions = [...data.transactions];
 
+    // Filter by period
+    transactions = transactions.filter((t) => {
+      const transactionDate = new Date(t.date);
+      if (endDate) {
+        // Custom date range
+        const endOfDay = new Date(endDate);
+        endOfDay.setHours(23, 59, 59, 999);
+        return transactionDate >= startDate && transactionDate <= endOfDay;
+      } else if (period !== "all") {
+        // Standard period
+        return transactionDate >= startDate;
+      }
+      return true;
+    });
+
     if (searchQuery) {
       const query = searchQuery.toLowerCase();
       transactions = transactions.filter(
@@ -79,14 +128,29 @@ export default function TransactionsPage() {
     }
 
     return transactions;
-  }, [data, searchQuery, selectedCategories, showReconciled]);
+  }, [data, searchQuery, selectedCategories, showReconciled, period, startDate, endDate]);
 
-  // Transactions filtered for category filter (by accounts, search, reconciled - not categories)
+  // Transactions filtered for category filter (by accounts, search, reconciled, period - not categories)
   const transactionsForCategoryFilter = useMemo(() => {
     if (!data) return [];
 
     let transactions = [...data.transactions];
 
+    // Filter by period
+    transactions = transactions.filter((t) => {
+      const transactionDate = new Date(t.date);
+      if (endDate) {
+        // Custom date range
+        const endOfDay = new Date(endDate);
+        endOfDay.setHours(23, 59, 59, 999);
+        return transactionDate >= startDate && transactionDate <= endOfDay;
+      } else if (period !== "all") {
+        // Standard period
+        return transactionDate >= startDate;
+      }
+      return true;
+    });
+
     if (searchQuery) {
       const query = searchQuery.toLowerCase();
       transactions = transactions.filter(
@@ -110,13 +174,28 @@ export default function TransactionsPage() {
     }
 
     return transactions;
-  }, [data, searchQuery, selectedAccounts, showReconciled]);
+  }, [data, searchQuery, selectedAccounts, showReconciled, period, startDate, endDate]);
 
   const filteredTransactions = useMemo(() => {
     if (!data) return [];
 
     let transactions = [...data.transactions];
 
+    // Filter by period
+    transactions = transactions.filter((t) => {
+      const transactionDate = new Date(t.date);
+      if (endDate) {
+        // Custom date range
+        const endOfDay = new Date(endDate);
+        endOfDay.setHours(23, 59, 59, 999);
+        return transactionDate >= startDate && transactionDate <= endOfDay;
+      } else if (period !== "all") {
+        // Standard period
+        return transactionDate >= startDate;
+      }
+      return true;
+    });
+
     if (searchQuery) {
       const query = searchQuery.toLowerCase();
       transactions = transactions.filter(
@@ -172,6 +251,9 @@ export default function TransactionsPage() {
     selectedAccounts,
     selectedCategories,
     showReconciled,
+    period,
+    startDate,
+    endDate,
     sortField,
     sortOrder,
   ]);
@@ -424,6 +506,32 @@ export default function TransactionsPage() {
     }
   };
 
+  const deleteTransaction = async (transactionId: string) => {
+    // Optimistic update
+    const updatedTransactions = data.transactions.filter(
+      (t) => t.id !== transactionId
+    );
+    update({ ...data, transactions: updatedTransactions });
+    
+    // Remove from selected if selected
+    const newSelected = new Set(selectedTransactions);
+    newSelected.delete(transactionId);
+    setSelectedTransactions(newSelected);
+
+    try {
+      const response = await fetch(
+        `/api/banking/transactions?id=${transactionId}`,
+        {
+          method: "DELETE",
+        }
+      );
+      if (!response.ok) throw new Error("Failed to delete transaction");
+    } catch (error) {
+      console.error("Failed to delete transaction:", error);
+      refresh(); // Revert on error
+    }
+  };
+
   return (
     <PageLayout>
       <PageHeader
@@ -448,6 +556,21 @@ export default function TransactionsPage() {
         onCategoriesChange={setSelectedCategories}
         showReconciled={showReconciled}
         onReconciledChange={setShowReconciled}
+        period={period}
+        onPeriodChange={(p) => {
+          setPeriod(p);
+          if (p !== "custom") {
+            setIsCustomDatePickerOpen(false);
+          } else {
+            setIsCustomDatePickerOpen(true);
+          }
+        }}
+        customStartDate={customStartDate}
+        customEndDate={customEndDate}
+        onCustomStartDateChange={setCustomStartDate}
+        onCustomEndDateChange={setCustomEndDate}
+        isCustomDatePickerOpen={isCustomDatePickerOpen}
+        onCustomDatePickerOpenChange={setIsCustomDatePickerOpen}
         accounts={data.accounts}
         folders={data.folders}
         categories={data.categories}
@@ -476,6 +599,7 @@ export default function TransactionsPage() {
         onMarkReconciled={markReconciled}
         onSetCategory={setCategory}
         onCreateRule={handleCreateRule}
+        onDelete={deleteTransaction}
         formatCurrency={formatCurrency}
         formatDate={formatDate}
       />
diff --git a/components/settings/danger-zone-card.tsx b/components/settings/danger-zone-card.tsx
index e4d4066..0629646 100644
--- a/components/settings/danger-zone-card.tsx
+++ b/components/settings/danger-zone-card.tsx
@@ -1,5 +1,6 @@
 "use client";
 
+import { useState } from "react";
 import { Button } from "@/components/ui/button";
 import {
   Card,
@@ -19,19 +20,39 @@ import {
   AlertDialogTitle,
   AlertDialogTrigger,
 } from "@/components/ui/alert-dialog";
-import { Trash2, Tags } from "lucide-react";
+import { Trash2, Tags, Copy } from "lucide-react";
 
 interface DangerZoneCardProps {
   categorizedCount: number;
   onClearCategories: () => void;
   onResetData: () => void;
+  onDeduplicate: () => Promise<{ deletedCount: number; duplicatesFound: number }>;
 }
 
 export function DangerZoneCard({
   categorizedCount,
   onClearCategories,
   onResetData,
+  onDeduplicate,
 }: DangerZoneCardProps) {
+  const [deduplicating, setDeduplicating] = useState(false);
+
+  const handleDeduplicate = async () => {
+    setDeduplicating(true);
+    try {
+      const result = await onDeduplicate();
+      if (result.deletedCount > 0) {
+        alert(`${result.deletedCount} transaction${result.deletedCount > 1 ? "s" : ""} en double supprimée${result.deletedCount > 1 ? "s" : ""}`);
+      } else {
+        alert("Aucun doublon trouvé");
+      }
+    } catch (error) {
+      console.error(error);
+      alert("Erreur lors du dédoublonnage");
+    } finally {
+      setDeduplicating(false);
+    }
+  };
   return (
     <Card className="border-red-200">
       <CardHeader>
@@ -44,6 +65,48 @@ export function DangerZoneCard({
         </CardDescription>
       </CardHeader>
       <CardContent className="space-y-3">
+        {/* Dédoublonnage */}
+        <AlertDialog>
+          <AlertDialogTrigger asChild>
+            <Button
+              variant="outline"
+              className="w-full justify-start border-blue-300 text-blue-700 hover:bg-blue-50"
+              disabled={deduplicating}
+            >
+              <Copy className="w-4 h-4 mr-2" />
+              Dédoublonner les transactions
+              {deduplicating && (
+                <span className="ml-auto text-xs text-muted-foreground">
+                  En cours...
+                </span>
+              )}
+            </Button>
+          </AlertDialogTrigger>
+          <AlertDialogContent>
+            <AlertDialogHeader>
+              <AlertDialogTitle>
+                Dédoublonner les transactions ?
+              </AlertDialogTitle>
+              <AlertDialogDescription>
+                Cette action va rechercher et supprimer les transactions en double
+                dans votre base de données. Les critères de dédoublonnage sont :
+                même compte, même date, même montant et même libellé. La première
+                transaction trouvée sera conservée, les autres seront supprimées.
+              </AlertDialogDescription>
+            </AlertDialogHeader>
+            <AlertDialogFooter>
+              <AlertDialogCancel>Annuler</AlertDialogCancel>
+              <AlertDialogAction
+                onClick={handleDeduplicate}
+                className="bg-blue-600 hover:bg-blue-700"
+                disabled={deduplicating}
+              >
+                {deduplicating ? "Dédoublonnage..." : "Dédoublonner"}
+              </AlertDialogAction>
+            </AlertDialogFooter>
+          </AlertDialogContent>
+        </AlertDialog>
+
         {/* Supprimer catégories des opérations */}
         <AlertDialog>
           <AlertDialogTrigger asChild>
diff --git a/components/transactions/transaction-filters.tsx b/components/transactions/transaction-filters.tsx
index e43f7ba..202ffef 100644
--- a/components/transactions/transaction-filters.tsx
+++ b/components/transactions/transaction-filters.tsx
@@ -13,9 +13,16 @@ import {
 import { CategoryFilterCombobox } from "@/components/ui/category-filter-combobox";
 import { AccountFilterCombobox } from "@/components/ui/account-filter-combobox";
 import { CategoryIcon } from "@/components/ui/category-icon";
-import { Search, X, Filter, Wallet } from "lucide-react";
+import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
+import { Calendar as CalendarComponent } from "@/components/ui/calendar";
+import { Button } from "@/components/ui/button";
+import { Search, X, Filter, Wallet, Calendar } from "lucide-react";
+import { format } from "date-fns";
+import { fr } from "date-fns/locale";
 import type { Account, Category, Folder, Transaction } from "@/lib/types";
 
+type Period = "1month" | "3months" | "6months" | "12months" | "custom" | "all";
+
 interface TransactionFiltersProps {
   searchQuery: string;
   onSearchChange: (query: string) => void;
@@ -25,11 +32,19 @@ interface TransactionFiltersProps {
   onCategoriesChange: (categories: string[]) => void;
   showReconciled: string;
   onReconciledChange: (value: string) => void;
+  period: Period;
+  onPeriodChange: (period: Period) => void;
+  customStartDate?: Date;
+  customEndDate?: Date;
+  onCustomStartDateChange: (date: Date | undefined) => void;
+  onCustomEndDateChange: (date: Date | undefined) => void;
+  isCustomDatePickerOpen: boolean;
+  onCustomDatePickerOpenChange: (open: boolean) => void;
   accounts: Account[];
   folders: Folder[];
   categories: Category[];
-  transactionsForAccountFilter?: Transaction[]; // Filtered by categories, search, reconciled (not accounts)
-  transactionsForCategoryFilter?: Transaction[]; // Filtered by accounts, search, reconciled (not categories)
+  transactionsForAccountFilter?: Transaction[]; // Filtered by categories, search, reconciled, period (not accounts)
+  transactionsForCategoryFilter?: Transaction[]; // Filtered by accounts, search, reconciled, period (not categories)
 }
 
 export function TransactionFilters({
@@ -41,6 +56,14 @@ export function TransactionFilters({
   onCategoriesChange,
   showReconciled,
   onReconciledChange,
+  period,
+  onPeriodChange,
+  customStartDate,
+  customEndDate,
+  onCustomStartDateChange,
+  onCustomEndDateChange,
+  isCustomDatePickerOpen,
+  onCustomDatePickerOpenChange,
   accounts,
   folders,
   categories,
@@ -90,6 +113,111 @@ export function TransactionFilters({
               <SelectItem value="not-reconciled">Non pointées</SelectItem>
             </SelectContent>
           </Select>
+
+          <Select
+            value={period}
+            onValueChange={(v) => {
+              onPeriodChange(v as Period);
+              if (v !== "custom") {
+                onCustomDatePickerOpenChange(false);
+              } else {
+                onCustomDatePickerOpenChange(true);
+              }
+            }}
+          >
+            <SelectTrigger className="w-[150px]">
+              <SelectValue placeholder="Période" />
+            </SelectTrigger>
+            <SelectContent>
+              <SelectItem value="1month">1 mois</SelectItem>
+              <SelectItem value="3months">3 mois</SelectItem>
+              <SelectItem value="6months">6 mois</SelectItem>
+              <SelectItem value="12months">12 mois</SelectItem>
+              <SelectItem value="custom">Personnalisé</SelectItem>
+              <SelectItem value="all">Tout</SelectItem>
+            </SelectContent>
+          </Select>
+
+          {period === "custom" && (
+            <Popover open={isCustomDatePickerOpen} onOpenChange={onCustomDatePickerOpenChange}>
+              <PopoverTrigger asChild>
+                <Button variant="outline" className="w-[280px] justify-start text-left font-normal">
+                  <Calendar className="mr-2 h-4 w-4" />
+                  {customStartDate && customEndDate ? (
+                    <>
+                      {format(customStartDate, "PPP", { locale: fr })} -{" "}
+                      {format(customEndDate, "PPP", { locale: fr })}
+                    </>
+                  ) : customStartDate ? (
+                    format(customStartDate, "PPP", { locale: fr })
+                  ) : (
+                    <span className="text-muted-foreground">Sélectionner les dates</span>
+                  )}
+                </Button>
+              </PopoverTrigger>
+              <PopoverContent className="w-auto p-0" align="start">
+                <div className="p-4 space-y-4">
+                  <div className="space-y-2">
+                    <label className="text-sm font-medium">Date de début</label>
+                    <CalendarComponent
+                      mode="single"
+                      selected={customStartDate}
+                      onSelect={(date) => {
+                        onCustomStartDateChange(date);
+                        if (date && customEndDate && date > customEndDate) {
+                          onCustomEndDateChange(undefined);
+                        }
+                      }}
+                      locale={fr}
+                    />
+                  </div>
+                  <div className="space-y-2">
+                    <label className="text-sm font-medium">Date de fin</label>
+                    <CalendarComponent
+                      mode="single"
+                      selected={customEndDate}
+                      onSelect={(date) => {
+                        if (date && customStartDate && date < customStartDate) {
+                          return;
+                        }
+                        onCustomEndDateChange(date);
+                        if (date && customStartDate) {
+                          onCustomDatePickerOpenChange(false);
+                        }
+                      }}
+                      disabled={(date) => {
+                        if (!customStartDate) return true;
+                        return date < customStartDate;
+                      }}
+                      locale={fr}
+                    />
+                  </div>
+                  {customStartDate && customEndDate && (
+                    <div className="flex gap-2 pt-2 border-t">
+                      <Button
+                        variant="outline"
+                        size="sm"
+                        className="flex-1"
+                        onClick={() => {
+                          onCustomStartDateChange(undefined);
+                          onCustomEndDateChange(undefined);
+                        }}
+                      >
+                        Réinitialiser
+                      </Button>
+                      <Button
+                        size="sm"
+                        className="flex-1"
+                        onClick={() => onCustomDatePickerOpenChange(false)}
+                      >
+                        Valider
+                      </Button>
+                    </div>
+                  )}
+                </div>
+              </PopoverContent>
+            </Popover>
+          )}
         </div>
 
         <ActiveFilters
@@ -109,6 +237,14 @@ export function TransactionFilters({
           onClearCategories={() => onCategoriesChange(["all"])}
           showReconciled={showReconciled}
           onClearReconciled={() => onReconciledChange("all")}
+          period={period}
+          onClearPeriod={() => {
+            onPeriodChange("all");
+            onCustomStartDateChange(undefined);
+            onCustomEndDateChange(undefined);
+          }}
+          customStartDate={customStartDate}
+          customEndDate={customEndDate}
           accounts={accounts}
           categories={categories}
         />
@@ -128,6 +264,10 @@ function ActiveFilters({
   onClearCategories,
   showReconciled,
   onClearReconciled,
+  period,
+  onClearPeriod,
+  customStartDate,
+  customEndDate,
   accounts,
   categories,
 }: {
@@ -141,6 +281,10 @@ function ActiveFilters({
   onClearCategories: () => void;
   showReconciled: string;
   onClearReconciled: () => void;
+  period: Period;
+  onClearPeriod: () => void;
+  customStartDate?: Date;
+  customEndDate?: Date;
   accounts: Account[];
   categories: Category[];
 }) {
@@ -148,8 +292,9 @@ function ActiveFilters({
   const hasAccounts = !selectedAccounts.includes("all");
   const hasCategories = !selectedCategories.includes("all");
   const hasReconciled = showReconciled !== "all";
+  const hasPeriod = period !== "all";
 
-  const hasActiveFilters = hasSearch || hasAccounts || hasCategories || hasReconciled;
+  const hasActiveFilters = hasSearch || hasAccounts || hasCategories || hasReconciled || hasPeriod;
 
   if (!hasActiveFilters) return null;
 
@@ -162,6 +307,7 @@ function ActiveFilters({
     onClearAccounts();
     onClearCategories();
     onClearReconciled();
+    onClearPeriod();
   };
 
   return (
@@ -229,6 +375,26 @@ function ActiveFilters({
         </Badge>
       )}
 
+      {hasPeriod && (
+        <Badge variant="secondary" className="gap-1 text-xs font-normal">
+          <Calendar className="h-3 w-3" />
+          {period === "custom" && customStartDate && customEndDate
+            ? `${format(customStartDate, "d MMM", { locale: fr })} - ${format(customEndDate, "d MMM yyyy", { locale: fr })}`
+            : period === "1month"
+            ? "1 mois"
+            : period === "3months"
+            ? "3 mois"
+            : period === "6months"
+            ? "6 mois"
+            : period === "12months"
+            ? "12 mois"
+            : "Période"}
+          <button onClick={onClearPeriod} className="ml-1 hover:text-foreground">
+            <X className="h-3 w-3" />
+          </button>
+        </Badge>
+      )}
+
       <button
         onClick={clearAll}
         className="text-xs text-muted-foreground hover:text-foreground ml-auto"
diff --git a/components/transactions/transaction-table.tsx b/components/transactions/transaction-table.tsx
index 6d0fefb..b406c89 100644
--- a/components/transactions/transaction-table.tsx
+++ b/components/transactions/transaction-table.tsx
@@ -18,6 +18,7 @@ import {
   MoreVertical,
   ArrowUpDown,
   Wand2,
+  Trash2,
 } from "lucide-react";
 import { DropdownMenuSeparator } from "@/components/ui/dropdown-menu";
 import { cn } from "@/lib/utils";
@@ -40,6 +41,7 @@ interface TransactionTableProps {
   onMarkReconciled: (id: string) => void;
   onSetCategory: (transactionId: string, categoryId: string | null) => void;
   onCreateRule: (transaction: Transaction) => void;
+  onDelete: (id: string) => void;
   formatCurrency: (amount: number) => string;
   formatDate: (dateStr: string) => string;
 }
@@ -60,6 +62,7 @@ export function TransactionTable({
   onMarkReconciled,
   onSetCategory,
   onCreateRule,
+  onDelete,
   formatCurrency,
   formatDate,
 }: TransactionTableProps) {
@@ -319,6 +322,23 @@ export function TransactionTable({
                               <Wand2 className="w-4 h-4 mr-2" />
                               Créer une règle
                             </DropdownMenuItem>
+                            <DropdownMenuSeparator />
+                            <DropdownMenuItem
+                              onClick={(e) => {
+                                e.stopPropagation();
+                                if (
+                                  confirm(
+                                    `Êtes-vous sûr de vouloir supprimer cette transaction ?\n\n${transaction.description}\n${formatCurrency(transaction.amount)}`
+                                  )
+                                ) {
+                                  onDelete(transaction.id);
+                                }
+                              }}
+                              className="text-red-600 focus:text-red-600"
+                            >
+                              <Trash2 className="w-4 h-4 mr-2" />
+                              Supprimer
+                            </DropdownMenuItem>
                           </DropdownMenuContent>
                         </DropdownMenu>
                       </div>
diff --git a/scripts/import-csv-to-db.ts b/scripts/import-csv-to-db.ts
index 015a618..c6bd2b2 100644
--- a/scripts/import-csv-to-db.ts
+++ b/scripts/import-csv-to-db.ts
@@ -239,11 +239,36 @@ async function main() {
       return dateA.localeCompare(dateB);
     });
     
-    // Calculate balance
-    const balance = transactions.reduce((sum, t) => sum + parseAmount(t.amount), 0);
+    // Deduplicate transactions: same amount + same date + same libelle (description)
+    const seenTransactions = new Map<string, CSVTransaction>();
+    const uniqueTransactions: CSVTransaction[] = [];
+    let duplicatesCount = 0;
+    
+    for (const transaction of transactions) {
+      const amount = parseAmount(transaction.amount);
+      const date = parseDate(transaction.date);
+      const description = transaction.libelle.trim();
+      
+      // Create a unique key: date-amount-description
+      const key = `${date}-${amount}-${description}`;
+      
+      if (!seenTransactions.has(key)) {
+        seenTransactions.set(key, transaction);
+        uniqueTransactions.push(transaction);
+      } else {
+        duplicatesCount++;
+      }
+    }
+    
+    if (duplicatesCount > 0) {
+      console.log(`  → ${duplicatesCount} doublons détectés et ignorés (même date, montant, libellé)`);
+    }
+    
+    // Calculate balance from unique transactions
+    const balance = uniqueTransactions.reduce((sum, t) => sum + parseAmount(t.amount), 0);
     
     // Prepare transactions for insertion
-    const dbTransactions = transactions.map((transaction, index) => {
+    const dbTransactions = uniqueTransactions.map((transaction, index) => {
       const amount = parseAmount(transaction.amount);
       const date = parseDate(transaction.date);
       
diff --git a/services/transaction.service.ts b/services/transaction.service.ts
index 6aca1a3..8921dc5 100644
--- a/services/transaction.service.ts
+++ b/services/transaction.service.ts
@@ -8,25 +8,56 @@ export interface CreateManyResult {
 
 export const transactionService = {
   async createMany(transactions: Transaction[]): Promise<CreateManyResult> {
-    // Filter out duplicates based on fitId (business rule)
-    const existingTransactions = await prisma.transaction.findMany({
+    // Get unique account IDs
+    const accountIds = [...new Set(transactions.map((t) => t.accountId))];
+    
+    // Check for existing transactions by fitId
+    const existingByFitId = await prisma.transaction.findMany({
       where: {
-        accountId: { in: transactions.map((t) => t.accountId) },
+        accountId: { in: accountIds },
         fitId: { in: transactions.map((t) => t.fitId) },
       },
       select: {
         accountId: true,
         fitId: true,
+        date: true,
+        amount: true,
+        description: true,
       },
     });
 
-    const existingSet = new Set(
-      existingTransactions.map((t) => `${t.accountId}-${t.fitId}`),
+    // Get all existing transactions for these accounts to check duplicates by criteria
+    const allExistingTransactions = await prisma.transaction.findMany({
+      where: {
+        accountId: { in: accountIds },
+      },
+      select: {
+        accountId: true,
+        date: true,
+        amount: true,
+        description: true,
+      },
+    });
+
+    // Create sets for fast lookup
+    const existingFitIdSet = new Set(
+      existingByFitId.map((t) => `${t.accountId}-${t.fitId}`),
+    );
+    
+    // Create set for duplicates by amount + date + description
+    const existingCriteriaSet = new Set(
+      allExistingTransactions.map((t) => 
+        `${t.accountId}-${t.date}-${t.amount}-${t.description}`
+      ),
     );
 
-    const newTransactions = transactions.filter(
-      (t) => !existingSet.has(`${t.accountId}-${t.fitId}`),
-    );
+    // Filter out duplicates based on fitId OR (amount + date + description)
+    const newTransactions = transactions.filter((t) => {
+      const fitIdKey = `${t.accountId}-${t.fitId}`;
+      const criteriaKey = `${t.accountId}-${t.date}-${t.amount}-${t.description}`;
+      
+      return !existingFitIdSet.has(fitIdKey) && !existingCriteriaSet.has(criteriaKey);
+    });
 
     if (newTransactions.length === 0) {
       return { count: 0, transactions: [] };
@@ -90,6 +121,65 @@ export const transactionService = {
       where: { id },
     });
   },
+
+  async deduplicate(): Promise<{ deletedCount: number; duplicatesFound: number }> {
+    // Get all transactions grouped by account
+    const allTransactions = await prisma.transaction.findMany({
+      orderBy: [
+        { accountId: "asc" },
+        { date: "asc" },
+        { id: "asc" }, // Keep the oldest transaction (first created)
+      ],
+      select: {
+        id: true,
+        accountId: true,
+        date: true,
+        amount: true,
+        description: true,
+      },
+    });
+
+    // Group by account for efficient processing
+    const transactionsByAccount = new Map<string, typeof allTransactions>();
+    for (const transaction of allTransactions) {
+      if (!transactionsByAccount.has(transaction.accountId)) {
+        transactionsByAccount.set(transaction.accountId, []);
+      }
+      transactionsByAccount.get(transaction.accountId)!.push(transaction);
+    }
+
+    const duplicatesToDelete: string[] = [];
+    const seenKeys = new Set<string>();
+
+    // For each account, find duplicates
+    for (const [accountId, transactions] of transactionsByAccount.entries()) {
+      for (const transaction of transactions) {
+        const key = `${accountId}-${transaction.date}-${transaction.amount}-${transaction.description}`;
+        
+        if (seenKeys.has(key)) {
+          // This is a duplicate, mark for deletion
+          duplicatesToDelete.push(transaction.id);
+        } else {
+          // First occurrence, keep it
+          seenKeys.add(key);
+        }
+      }
+    }
+
+    // Delete duplicates
+    if (duplicatesToDelete.length > 0) {
+      await prisma.transaction.deleteMany({
+        where: {
+          id: { in: duplicatesToDelete },
+        },
+      });
+    }
+
+    return {
+      deletedCount: duplicatesToDelete.length,
+      duplicatesFound: duplicatesToDelete.length,
+    };
+  },
 };