Secondary SDR panel: never present an unreported SDR count or run state as fact

QA (drb-qa-review) blockers: sdr_count defaulted to 1 for nodes that
never sent it, so the panel claimed 'reports 1 SDR (0 spare)'. It is now
None until reported, and the count is only quoted alongside a real
secondary_sdr_running report. Rows read 'Not reported' instead of
'Waiting for SDR' when the node hasn't said what's running (closes #187).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

drb-c2-core/app/internal/mqtt_handler.py

@@ -114,7 +114,7 @@ class MQTTHandler:
                 "secondary_sdr_mode": payload.get("secondary_sdr_mode", "none"),
                 "secondary_sdr_priority": payload.get("secondary_sdr_priority", []),
                 "secondary_sdr_running": payload.get("secondary_sdr_running"),
-                "sdr_count": payload.get("sdr_count", 1),
+                "sdr_count": payload.get("sdr_count"),  # None until reported, never a guessed 1
                 "enforce_override_timeout": payload.get("enforce_override_timeout", True),
                 "is_overridden": False,
                 "override_system_id": None,

drb-c2-core/app/models.py

@@ -68,7 +68,7 @@ class NodeRecord(BaseModel):
     # checkin, which is the source of truth; set via PATCH /nodes/{id}.
     secondary_sdr_priority: List[str] = []
     secondary_sdr_running: Optional[List[str]] = None  # what the node reports actually running
-    sdr_count: int = 1  # self-reported by the node's checkin, best-effort
+    sdr_count: Optional[int] = None  # self-reported by the node's checkin; None = never reported
     enforce_override_timeout: bool = True
     is_overridden: bool = False
     override_system_id: Optional[str] = None

drb-frontend/components/SecondarySdrPriority.tsx

@@ -22,6 +22,9 @@ function rowsFrom(priority: string[]): Row[] {
 
 export function SecondarySdrPriority({ node, canEdit }: { node: NodeRecord; canEdit: boolean }) {
   const priority = node.secondary_sdr_priority ?? [];
+  // null/absent = the node has never reported (older firmware, container down
+  // at checkin): unknown, not "nothing running" (server-26#187).
+  const reported = node.secondary_sdr_running != null;
   const running = node.secondary_sdr_running ?? [];
   const [rows, setRows] = useState<Row[]>(() => rowsFrom(priority));
   const [dirty, setDirty] = useState(false);
@@ -62,8 +65,9 @@ export function SecondarySdrPriority({ node, canEdit }: { node: NodeRecord; canE
     }
   }
 
-  const sdrCount = node.sdr_count ?? 1;
-  const spare = Math.max(sdrCount - 1, 0);
+  // Only quote a count the node actually sent alongside its running list; a
+  // bare sdr_count may be the Firestore default, not a report.
+  const sdrCount = reported ? node.sdr_count : undefined;
   let rank = 0;
 
   return (
@@ -71,13 +75,24 @@ export function SecondarySdrPriority({ node, canEdit }: { node: NodeRecord; canE
       <h2 className="text-sm font-semibold text-gray-400 uppercase tracking-wider mb-1">Secondary SDRs</h2>
       <p className="text-xs text-gray-500 font-mono mb-3">
         OP25 always keeps its own SDR. Every other SDR runs the next enabled item, top first.
-        {" "}This node reports {sdrCount} SDR{sdrCount === 1 ? "" : "s"} ({spare} spare).
+        {" "}
+        {sdrCount != null
+          ? `This node reports ${sdrCount} SDR${sdrCount === 1 ? "" : "s"} (${Math.max(sdrCount - 1, 0)} spare).`
+          : "This node hasn't reported its SDRs yet."}
       </p>
       <div className="bg-gray-900 border border-gray-800 rounded-lg divide-y divide-gray-800 font-mono text-sm">
         {rows.map((row, i) => {
           const meta = MODES.find((x) => x.mode === row.mode)!;
           const isRunning = running.includes(row.mode);
-          const state = !row.enabled ? "Off" : dirty ? "Unsaved" : isRunning ? "Running" : "Waiting for SDR";
+          const state = !row.enabled
+            ? "Off"
+            : dirty
+              ? "Unsaved"
+              : !reported
+                ? "Not reported"
+                : isRunning
+                  ? "Running"
+                  : "Waiting for SDR";
           return (
             <div key={row.mode} className="flex items-center gap-3 px-4 py-2.5">
               <span className="w-4 text-right text-gray-600 text-xs">{row.enabled ? ++rank : ""}</span>

drb-frontend/lib/types.ts

@@ -58,7 +58,7 @@ export interface NodeRecord {
   secondary_sdr_priority?: string[];
   /** What the node's last checkin reported actually running. */
   secondary_sdr_running?: string[] | null;
-  sdr_count?: number;
+  sdr_count?: number | null; // null = never reported
   enforce_override_timeout?: boolean;
   is_overridden?: boolean;
   override_system_id?: string | null;