fix: use real totalCount from Subsquid instead of capped fetch limit

Add totalCount to the GraphQL query so transactionCount reflects the
true number of transfers in the period, not the 2000-item fetch cap.
This also fixes the average Ğ1/tx calculation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/services/DataService.ts

@@ -37,10 +37,9 @@ async function fetchLiveTransactions(periodDays: number): Promise<{
   totalCount: number;
   totalVolume: number;
 }> {
-  const rawTransfers = await fetchTransfers(periodDays);
+  const { transfers: rawTransfers, totalCount } = await fetchTransfers(periodDays);
   if (rawTransfers.length === 0) return { geolocated: [], totalCount: 0, totalVolume: 0 };
 
-  const totalCount  = rawTransfers.length;
   const totalVolume = rawTransfers.reduce((s, t) => s + t.amount, 0);
 
   // Carte SS58 courant → clé Duniter (= _id Cesium+)

src/services/adapters/SubsquidAdapter.ts

@@ -33,6 +33,7 @@ const SubsquidTransferNodeSchema = z.object({
 const SubsquidResponseSchema = z.object({
   data: z.object({
     transfers: z.object({
+      totalCount: z.number().int(),
       nodes: z.array(SubsquidTransferNodeSchema),
     }),
   }),
@@ -62,6 +63,7 @@ const TRANSFERS_QUERY = `
       first: $limit
       filter: { timestamp: { greaterThanOrEqualTo: $since } }
     ) {
+      totalCount
       nodes {
         id
         blockNumber
@@ -151,10 +153,15 @@ export async function buildIdentityKeyMap(): Promise<Map<string, string>> {
   return result;
 }
 
+export interface FetchTransfersResult {
+  transfers: RawTransfer[];
+  totalCount: number;
+}
+
 export async function fetchTransfers(
   periodDays: number,
   limit = 2000
-): Promise<RawTransfer[]> {
+): Promise<FetchTransfersResult> {
   const since = new Date(
     Date.now() - periodDays * 24 * 60 * 60 * 1000
   ).toISOString();
@@ -180,12 +187,15 @@ export async function fetchTransfers(
 
   const parsed = SubsquidResponseSchema.parse(raw);
 
-  return parsed.data.transfers.nodes.map((node) => ({
-    id:        node.id,
-    timestamp: new Date(node.timestamp).getTime(),
-    amount:    parseInt(node.amount, 10) / 100,
-    fromId:    node.fromId ?? '',
-    toId:      node.toId ?? '',
-    fromName:  node.from?.linkedIdentity?.name ?? '',
-  }));
+  return {
+    totalCount: parsed.data.transfers.totalCount,
+    transfers: parsed.data.transfers.nodes.map((node) => ({
+      id:        node.id,
+      timestamp: new Date(node.timestamp).getTime(),
+      amount:    parseInt(node.amount, 10) / 100,
+      fromId:    node.fromId ?? '',
+      toId:      node.toId ?? '',
+      fromName:  node.from?.linkedIdentity?.name ?? '',
+    })),
+  };
 }