i hate weather

server/src/services/roverSnapshotService/poller.js

@@ -10,6 +10,7 @@ const SNAPSHOT_DIR = process.env.ROVER_SNAPSHOT_DIR || '/var/lib/rover-snapshots
 const POLL_INTERVAL_MS = 300;
 const roverState = new Map();
 const events = new EventEmitter();
+const readCounts = new Map();
 let pollTimer = null;
 
 function markState(id, updates = {}) {
@@ -35,6 +36,11 @@ function createRoverSnapshotPoller({ roverManager }) {
       const buffer = await fs.readFile(filePath);
       const ts = stats.mtimeMs || Date.now();
       markState(id, { frame: buffer, ts, error: null, failures: 0, mtimeMs: stats.mtimeMs });
+      const count = (readCounts.get(id) || 0) + 1;
+      readCounts.set(id, count);
+      if (count === 1 || count % 30 === 0) {
+        logger.warn('Snapshot read', { id, count, ts, bytes: buffer.length, mtimeMs: stats.mtimeMs });
+      }
       events.emit('frame', { id, buffer, ts });
       return { frame: buffer, ts };
     } catch (err) {

server/src/services/roverSnapshotService/socketGateway.js

@@ -25,6 +25,7 @@ function registerRoverSnapshotSocketGateway({ roverManager, roverSnapshotEvents,
   const socketSubscriptions = new Map();
   const subscribeBuckets = new Map();
   const lastSentBySocket = new Map();
+  const sentCounts = new Map();
 
   function addSubscription(socket, roverId) {
     if (!roverSubscribers.has(roverId)) roverSubscribers.set(roverId, new Set());
@@ -84,6 +85,12 @@ function registerRoverSnapshotSocketGateway({ roverManager, roverSnapshotEvents,
       const now = ts || Date.now();
       if (now - lastSent < STREAM_INTERVAL_MS) return;
       lastMap.set(id, now);
+      const key = `${socketId}:${id}`;
+      const sentCount = (sentCounts.get(key) || 0) + 1;
+      sentCounts.set(key, sentCount);
+      if (sentCount === 1 || sentCount % 30 === 0) {
+        logger.warn('Snapshot frame sent', { socketId, roverId: id, sentCount, ts, bytes: buffer.length });
+      }
       sendFrame(socket, id, { ts }, buffer);
     });
   });