feat: add transaction deduplication feature and enhance filtering options in settings and transactions pages

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 }
+    );
+  }
+}
+