fix: TKG build waits for face_traced.json to ensure face_track nodes are built

- Add check for face_traced.json existence before spawning TKG build
- Prevents race condition where TKG reads Qdrant before trace_id is written
- Logs clearly when waiting and when proceeding

src/worker/job_worker.rs

@@ -2102,12 +2102,29 @@ impl JobWorker {
                 if tkg_done {
                     info!("✅ TKG already built for {}, skipping spawn", uuid);
                 } else {
-                    info!("📝 Prerequisites met for TKG Build. Starting graph construction...");
+                    // Check if face_traced.json exists (store_traced_faces.py completed)
-                    let db_clone = self.db.clone();
+                    let traced_path = format!(
-                    let redis_clone = self.redis.clone();
+                        "{}{}.face_traced.json",
-                    let uuid_clone = uuid.to_string();
+                        crate::core::config::OUTPUT_DIR.as_str().trim_end_matches('/'),
-                    let output_dir_clone = crate::core::config::OUTPUT_DIR.clone();
+                        uuid
-                    tokio::spawn(async move {
+                    );
+                    
+                    if !std::path::Path::new(&traced_path).exists() {
+                        info!(
+                            "⏳ TKG build waiting for face_traced.json: {} (file_uuid={})",
+                            traced_path, uuid
+                        );
+                        // Don't spawn TKG yet, wait for next poll
+                    } else {
+                        info!(
+                            "📝 Prerequisites met for TKG Build (face_traced.json exists): {}",
+                            uuid
+                        );
+                        let db_clone = self.db.clone();
+                        let redis_clone = self.redis.clone();
+                        let uuid_clone = uuid.to_string();
+                        let output_dir_clone = crate::core::config::OUTPUT_DIR.clone();
+                        tokio::spawn(async move {
                         match crate::core::processor::tkg::build_tkg(
                             &db_clone,
                             &uuid_clone,
@@ -2191,6 +2208,7 @@ impl JobWorker {
                             Err(e) => error!("❌ TKG build failed for {}: {}", uuid_clone, e),
                         }
                     });
+                    }
                 }
             }