Save latest node channel update in node.updated_at field in db

backend/src/api/explorer/channels.api.ts

@@ -522,6 +522,23 @@ class ChannelsApi {
       logger.err('$setChannelsInactive() error: ' + (e instanceof Error ? e.message : e));
     }
   }
+
+  public async $getLatestChannelUpdateForNode(publicKey: string): Promise<number> {
+    try {
+      const query = `
+        SELECT MAX(UNIX_TIMESTAMP(updated_at)) as updated_at
+        FROM channels
+        WHERE node1_public_key = ?
+      `;
+      const [rows]: any[] = await DB.query(query, [publicKey]);
+      if (rows.length > 0) {
+        return rows[0].updated_at;
+      }
+    } catch (e) {
+      logger.err(`Can't getLatestChannelUpdateForNode for ${publicKey}. Reason ${e instanceof Error ? e.message : e}`);
+    }
+    return 0;
+  }
 }
 
 export default new ChannelsApi();

backend/src/tasks/lightning/network-sync.service.ts

@@ -63,6 +63,9 @@ class NetworkSyncService {
     let deletedSockets = 0;
     const graphNodesPubkeys: string[] = [];
     for (const node of nodes) {
+      const latestUpdated = await channelsApi.$getLatestChannelUpdateForNode(node.pub_key);
+      node.last_update = Math.max(node.last_update, latestUpdated);
+
       await nodesApi.$saveNode(node);
       graphNodesPubkeys.push(node.pub_key);
       ++progress;