diff --git a/fam-core/src/fam_core/db_layer.py b/fam-core/src/fam_core/db_layer.py
index 4739b02..e2c3221 100644
--- a/fam-core/src/fam_core/db_layer.py
+++ b/fam-core/src/fam_core/db_layer.py
@@ -106,31 +106,35 @@ def get_sync_videos(limit=15, offset=0, date_filter=None) -> List[Dict]:
     排序/日期维度按视频实际录制时间（event_start_time，文件名解析），
     为空回退 processed_at/updated_at/created_at。
     date_filter 形如 '2026-08-21'。
+    只返回"有内容"的会话：运动片段（filename 前缀 motion_）或含事件的视频；
+    整段素材分割 0 段的空会话（历史素材无运动事件）不展示，避免淹没时间轴。
     """
     conn = get_conn()
     try:
         cur = conn.cursor(pymysql.cursors.DictCursor)
         # 录制时间优先，回退分析时间
         date_expr = "COALESCE(NULLIF(event_start_time,''), processed_at, updated_at, created_at)"
+        content_filter = ("v.filename LIKE 'motion_%' "
+                          "OR EXISTS(SELECT 1 FROM sync_events se WHERE se.video_id = v.id)")
         if date_filter:
             cur.execute(
-                f"""SELECT id, filename, camera_name, event_start_time, status,
-                          summary_json, events_json, people_json, compute_provider,
-                          processed_at, updated_at,
-                          (SELECT COUNT(*) FROM sync_events se WHERE se.video_id = sync_videos.id) AS event_count
-                   FROM sync_videos
-                   WHERE status='done' AND {date_expr} LIKE %s
+                f"""SELECT v.id, v.filename, v.camera_name, v.event_start_time, v.status,
+                          v.summary_json, v.events_json, v.people_json, v.compute_provider,
+                          v.processed_at, v.updated_at,
+                          (SELECT COUNT(*) FROM sync_events se WHERE se.video_id = v.id) AS event_count
+                   FROM sync_videos v
+                   WHERE v.status='done' AND ({content_filter}) AND {date_expr} LIKE %s
                    ORDER BY {date_expr} DESC
                    LIMIT %s OFFSET %s""",
                 (f'{date_filter}%', limit, offset))
         else:
             cur.execute(
-                f"""SELECT id, filename, camera_name, event_start_time, status,
-                          summary_json, events_json, people_json, compute_provider,
-                          processed_at, updated_at,
-                          (SELECT COUNT(*) FROM sync_events se WHERE se.video_id = sync_videos.id) AS event_count
-                   FROM sync_videos
-                   WHERE status='done'
+                f"""SELECT v.id, v.filename, v.camera_name, v.event_start_time, v.status,
+                          v.summary_json, v.events_json, v.people_json, v.compute_provider,
+                          v.processed_at, v.updated_at,
+                          (SELECT COUNT(*) FROM sync_events se WHERE se.video_id = v.id) AS event_count
+                   FROM sync_videos v
+                   WHERE v.status='done' AND ({content_filter})
                    ORDER BY {date_expr} DESC
                    LIMIT %s OFFSET %s""",
                 (limit, offset))
@@ -524,19 +528,25 @@ def get_sync_stats(date_str: str = None) -> Dict:
         if date_str:
             cur.execute(
                 """SELECT
-                       COUNT(*) AS videos,
+                       (SELECT COUNT(*) FROM sync_videos sv
+                          WHERE sv.status='done'
+                            AND (sv.filename LIKE 'motion_%'
+                                 OR EXISTS(SELECT 1 FROM sync_events se WHERE se.video_id=sv.id))
+                            AND {d} LIKE %s) AS videos,
                        (SELECT COUNT(*) FROM sync_events se
                           JOIN sync_videos sv ON se.video_id=sv.id
                           WHERE {d} LIKE %s) AS events,
                        (SELECT COALESCE(SUM(se.is_attention_event),0) FROM sync_events se
                           JOIN sync_videos sv ON se.video_id=sv.id
-                          WHERE {d} LIKE %s) AS attention
-                   FROM sync_videos sv WHERE {d} LIKE %s""".format(d=_D),
+                          WHERE {d} LIKE %s) AS attention""".format(d=_D),
                 (f'{date_str}%', f'{date_str}%', f'{date_str}%'))
         else:
             cur.execute(
                 """SELECT
-                       (SELECT COUNT(*) FROM sync_videos WHERE status='done') AS videos,
+                       (SELECT COUNT(*) FROM sync_videos
+                          WHERE status='done'
+                            AND (filename LIKE 'motion_%'
+                                 OR EXISTS(SELECT 1 FROM sync_events se WHERE se.video_id=sync_videos.id))) AS videos,
                        (SELECT COUNT(*) FROM sync_events) AS events,
                        (SELECT COALESCE(SUM(is_attention_event),0) FROM sync_events) AS attention""")
         stat = cur.fetchone() or {}