diff --git a/package-lock.json b/package-lock.json
index 2aaa6a1..1e0f8ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -49,7 +49,7 @@
         "ts-node": "^10.9.2",
         "tsx": "^4.21.0",
         "tw-animate-css": "^1.4.0",
-        "typescript": "^5"
+        "typescript": "5.9.3"
       }
     },
     "node_modules/@alloc/quick-lru": {
diff --git a/package.json b/package.json
index d09d995..76a0a17 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,6 @@
     "ts-node": "^10.9.2",
     "tsx": "^4.21.0",
     "tw-animate-css": "^1.4.0",
-    "typescript": "^5"
+    "typescript": "5.9.3"
   }
 }
diff --git a/src/app/(app)/telegram/_components/channel-columns.tsx b/src/app/(app)/telegram/_components/channel-columns.tsx
index 98bdfca..e5f44b3 100644
--- a/src/app/(app)/telegram/_components/channel-columns.tsx
+++ b/src/app/(app)/telegram/_components/channel-columns.tsx
@@ -7,6 +7,7 @@ import {
   Power,
   ArrowDownToLine,
   ArrowUpFromLine,
+  RefreshCcw,
 } from "lucide-react";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
@@ -23,12 +24,14 @@ interface ChannelColumnsProps {
   onToggleActive: (id: string) => void;
   onDelete: (id: string) => void;
   onSetType: (id: string, type: "SOURCE" | "DESTINATION") => void;
+  onRescan: (id: string) => void;
 }
 
 export function getChannelColumns({
   onToggleActive,
   onDelete,
   onSetType,
+  onRescan,
 }: ChannelColumnsProps): ColumnDef<ChannelRow, unknown>[] {
   return [
     {
@@ -121,6 +124,14 @@ export function getChannelColumns({
                 Set as Source
               </DropdownMenuItem>
             )}
+            {row.original.type === "SOURCE" && (
+              <DropdownMenuItem
+                onClick={() => onRescan(row.original.id)}
+              >
+                <RefreshCcw className="mr-2 h-3.5 w-3.5" />
+                Rescan Channel
+              </DropdownMenuItem>
+            )}
             <DropdownMenuItem
               onClick={() => onToggleActive(row.original.id)}
             >
diff --git a/src/app/(app)/telegram/_components/channels-tab.tsx b/src/app/(app)/telegram/_components/channels-tab.tsx
index 0c12b23..042216a 100644
--- a/src/app/(app)/telegram/_components/channels-tab.tsx
+++ b/src/app/(app)/telegram/_components/channels-tab.tsx
@@ -8,6 +8,7 @@ import {
   deleteChannel,
   toggleChannelActive,
   setChannelType,
+  rescanChannel,
 } from "../actions";
 import { DataTable } from "@/components/shared/data-table";
 import { DeleteDialog } from "@/components/shared/delete-dialog";
@@ -22,6 +23,7 @@ interface ChannelsTabProps {
 export function ChannelsTab({ channels, globalDestination }: ChannelsTabProps) {
   const [isPending, startTransition] = useTransition();
   const [deleteId, setDeleteId] = useState<string | null>(null);
+  const [rescanId, setRescanId] = useState<string | null>(null);
 
   const columns = getChannelColumns({
     onToggleActive: (id) => {
@@ -39,6 +41,7 @@ export function ChannelsTab({ channels, globalDestination }: ChannelsTabProps) {
         else toast.error(result.error);
       });
     },
+    onRescan: (id) => setRescanId(id),
   });
 
   const { table } = useDataTable({
@@ -60,6 +63,19 @@ export function ChannelsTab({ channels, globalDestination }: ChannelsTabProps) {
     });
   };
 
+  const handleRescan = () => {
+    if (!rescanId) return;
+    startTransition(async () => {
+      const result = await rescanChannel(rescanId);
+      if (result.success) {
+        toast.success("Channel scan progress reset — it will be fully rescanned on the next sync");
+        setRescanId(null);
+      } else {
+        toast.error(result.error);
+      }
+    });
+  };
+
   return (
     <div className="space-y-4">
       <DestinationCard destination={globalDestination} />
@@ -83,6 +99,16 @@ export function ChannelsTab({ channels, globalDestination }: ChannelsTabProps) {
         onConfirm={handleDelete}
         isLoading={isPending}
       />
+
+      <DeleteDialog
+        open={!!rescanId}
+        onOpenChange={(open) => !open && setRescanId(null)}
+        title="Rescan Channel"
+        description="This will reset all scan progress for this channel. On the next sync the worker will re-process every message from the beginning. Packages that are already in the library will be skipped (deduplication by hash), but any missing files will be re-downloaded and re-uploaded. This may take a long time for large channels."
+        confirmLabel="Rescan"
+        onConfirm={handleRescan}
+        isLoading={isPending}
+      />
     </div>
   );
 }
diff --git a/src/app/(app)/telegram/actions.ts b/src/app/(app)/telegram/actions.ts
index 67acf2e..4e25d11 100644
--- a/src/app/(app)/telegram/actions.ts
+++ b/src/app/(app)/telegram/actions.ts
@@ -297,6 +297,52 @@ export async function triggerChannelSync(): Promise<ActionResult> {
   }
 }
 
+/**
+ * Reset all scan progress for a channel so the worker will re-process it
+ * from the very beginning on the next ingestion cycle.
+ *
+ * This clears:
+ *   - `lastProcessedMessageId` on every AccountChannelMap linked to this channel
+ *   - All TopicProgress records for those maps (for forum channels)
+ */
+export async function rescanChannel(channelId: string): Promise<ActionResult> {
+  const admin = await requireAdmin();
+  if (!admin.success) return admin;
+
+  const channel = await prisma.telegramChannel.findUnique({
+    where: { id: channelId },
+  });
+  if (!channel) return { success: false, error: "Channel not found" };
+
+  try {
+    // Find all account-channel maps for this channel
+    const maps = await prisma.accountChannelMap.findMany({
+      where: { channelId },
+      select: { id: true },
+    });
+
+    const mapIds = maps.map((m) => m.id);
+
+    // Delete all topic progress records for these maps (forum channels)
+    if (mapIds.length > 0) {
+      await prisma.topicProgress.deleteMany({
+        where: { accountChannelMapId: { in: mapIds } },
+      });
+    }
+
+    // Reset the scan cursor so the worker re-processes from the start
+    await prisma.accountChannelMap.updateMany({
+      where: { channelId },
+      data: { lastProcessedMessageId: null },
+    });
+
+    revalidatePath(REVALIDATE_PATH);
+    return { success: true, data: undefined };
+  } catch {
+    return { success: false, error: "Failed to reset channel scan progress" };
+  }
+}
+
 // ── Account-Channel link actions ──
 
 export async function linkChannel(
@@ -377,7 +423,7 @@ export async function triggerIngestion(
     try {
       await prisma.$queryRawUnsafe(
         `SELECT pg_notify('ingestion_trigger', $1)`,
-        accounts.map((a) => a.id).join(",")
+        accounts.map((a: { id: string }) => a.id).join(",")
       );
     } catch {
       // Best-effort
diff --git a/src/app/(app)/telegram/page.tsx b/src/app/(app)/telegram/page.tsx
index 2100d40..55247c5 100644
--- a/src/app/(app)/telegram/page.tsx
+++ b/src/app/(app)/telegram/page.tsx
@@ -25,7 +25,7 @@ export default async function TelegramPage() {
     }),
   ]);
 
-  const serializedHistory = sendHistory.map((r) => ({
+  const serializedHistory = sendHistory.map((r: typeof sendHistory[number]) => ({
     id: r.id,
     packageName: r.package.fileName,
     recipientName: r.telegramLink.telegramName,
diff --git a/src/app/api/ingestion/trigger/route.ts b/src/app/api/ingestion/trigger/route.ts
index 5586b6b..0cb3449 100644
--- a/src/app/api/ingestion/trigger/route.ts
+++ b/src/app/api/ingestion/trigger/route.ts
@@ -50,7 +50,7 @@ export async function POST(request: Request) {
   try {
     await prisma.$queryRawUnsafe(
       `SELECT pg_notify('ingestion_trigger', $1)`,
-      accounts.map((a) => a.id).join(",")
+      accounts.map((a: { id: string }) => a.id).join(",")
     );
   } catch {
     // pg_notify is best-effort — worker will pick up on next scheduled cycle anyway
@@ -58,7 +58,7 @@ export async function POST(request: Request) {
 
   return NextResponse.json({
     triggered: true,
-    accountIds: accounts.map((a) => a.id),
+    accountIds: accounts.map((a: { id: string }) => a.id),
     message: `Ingestion triggered for ${accounts.length} account(s)`,
   });
 }
diff --git a/src/components/shared/delete-dialog.tsx b/src/components/shared/delete-dialog.tsx
index be146f7..4ecee82 100644
--- a/src/components/shared/delete-dialog.tsx
+++ b/src/components/shared/delete-dialog.tsx
@@ -18,6 +18,8 @@ interface DeleteDialogProps {
   description?: string;
   onConfirm: () => void;
   isLoading?: boolean;
+  confirmLabel?: string;
+  confirmLoadingLabel?: string;
 }
 
 export function DeleteDialog({
@@ -27,6 +29,8 @@ export function DeleteDialog({
   description = "This action cannot be undone.",
   onConfirm,
   isLoading,
+  confirmLabel = "Delete",
+  confirmLoadingLabel,
 }: DeleteDialogProps) {
   return (
     <AlertDialog open={open} onOpenChange={onOpenChange}>
@@ -42,7 +46,7 @@ export function DeleteDialog({
             disabled={isLoading}
             className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
           >
-            {isLoading ? "Deleting..." : "Delete"}
+            {isLoading ? (confirmLoadingLabel ?? `${confirmLabel}...`) : confirmLabel}
           </AlertDialogAction>
         </AlertDialogFooter>
       </AlertDialogContent>