fix(mqtt): accept official firmware neighbours payload shape (UK envelope + snr_db/heard_secs_ago)

backend/src/mqtt/neighborPayload.test.ts

@@ -8,6 +8,12 @@ test('extracts the raw neighbor array, including an empty sample', () => {
   assert.deepEqual(extractNeighborNodes({ nodes: [] }), []);
 });
 
+test('accepts the official firmware UK-spelling envelope', () => {
+  const neighbours = [{ id: '5F318F39', snr_db: -4.5, heard_secs_ago: 3863 }];
+  assert.deepEqual(extractNeighborNodes({ neighbours }), neighbours);
+  assert.deepEqual(extractNeighborNodes({ neighbours: [] }), []);
+});
+
 test('rejects malformed neighbor envelopes', () => {
   assert.equal(extractNeighborNodes(null), null);
   assert.equal(extractNeighborNodes([]), null);

backend/src/mqtt/neighborPayload.ts

@@ -1,5 +1,8 @@
 export function extractNeighborNodes(value: unknown): unknown[] | null {
   if (!value || typeof value !== 'object' || Array.isArray(value)) return null;
-  const nodes = (value as Record<string, unknown>)['nodes'];
+  const record = value as Record<string, unknown>;
+  // Official MeshCore firmware publishes the UK spelling "neighbours" (matching
+  // its /neighbours topic suffix); our MQTT fork publishes "nodes". Accept both.
+  const nodes = record['nodes'] ?? record['neighbours'];
   return Array.isArray(nodes) ? nodes : null;
 }

backend/src/owner/ownerRepository.ts

@@ -637,11 +637,15 @@ export function createOwnerRepository(deps: OwnerRepositoryDeps) {
            CASE
              WHEN jsonb_typeof(item->'snr') = 'number' THEN (item->>'snr')::double precision
              WHEN jsonb_typeof(item->'SNR') = 'number' THEN (item->>'SNR')::double precision
+             WHEN jsonb_typeof(item->'snr_db') = 'number' THEN (item->>'snr_db')::double precision
              ELSE NULL
            END AS snr,
            COALESCE(
              CASE WHEN jsonb_typeof(item->'last_seen') IN ('string', 'number') THEN item->>'last_seen' ELSE NULL END,
-             CASE WHEN jsonb_typeof(item->'lastSeen') IN ('string', 'number') THEN item->>'lastSeen' ELSE NULL END
+             CASE WHEN jsonb_typeof(item->'lastSeen') IN ('string', 'number') THEN item->>'lastSeen' ELSE NULL END,
+             CASE WHEN jsonb_typeof(item->'heard_secs_ago') = 'number'
+                  THEN (latest.time - ((item->>'heard_secs_ago')::double precision * INTERVAL '1 second'))::text
+                  ELSE NULL END
            ) AS last_seen,
            latest.time::text AS sample_time
          FROM latest