Why the schema samples need a complete multi-asset multi-model example

Constraint: Phase-1 implementers need one concrete end-to-end sample that shows how a single song expands into multiple assets, windows, and model facts
Rejected: Keep only isolated insert snippets | does not help with batch backfill or completeness checks
Confidence: high
Scope-risk: narrow
Directive: When extending storage examples, include operational queries for gap detection and model completeness, not just inserts
Tested: markdown link check on /workspace/docs after adding the complete sample and audit SQL
Not-tested: No live database rerun; this is a documentation-only expansion over the verified schema

@@ -7,6 +7,7 @@
 - 继续补强在线检索说明：在 `docs/postgresql-data-model.md` 与 `docs/postgres_db_schema_samples.md` 新增 `feature_fact -> window -> asset -> song_id` 回溯流程图，以及 song-level 聚合 SQL 模板，方便研发直接按当前 schema 实现召回后归属。
 - 继续补充检索融合设计：在 `docs/postgresql-data-model.md` 与 `docs/postgres_db_schema_samples.md` 新增 exact lane + semantic lane 双通道的 song 级聚合流程图、规则融合口径与 SQL 骨架，明确 Phase-1 采用 `exact 主导、semantic 补强` 的排序策略。
 - 继续补充数据绑定与模型落库说明：在 `docs/postgresql-data-model.md` 与 `docs/postgres_db_schema_samples.md` 明确 `media_entity -> audio_object(asset/window) -> feature_fact` 的绑定字段关系，并给出 `chromaprint / mert-v1-95m / muq-base / local_wavehash_embed / ecapa-tdnn` 的 Phase-1 存储口径与 SQL 样例。
+- 在 `docs/postgres_db_schema_samples.md` 继续补充一个完整的 `同一 song -> 多 asset -> 多 window -> 多 model` 样例，附带缺模型扫描 SQL 与 asset 级特征完备性检查 SQL，方便 Phase-1 批量补算与巡检。
 
 ## 2026-06-04
 

@@ -633,3 +633,113 @@ where ff.song_id = :song_id
 group by ff.song_id, ff.model_name, ff.model_version, ff.feature_type
 order by ff.feature_type, ff.model_name;
 ```
+
+---
+
+## 14. 一个完整的多 asset / 多 window / 多 model 样例
+
+假设：
+- 同一个 `song_id = 1001`
+- 有 2 个音频文件：`master.wav`、`ugc_clip.mp3`
+- 每个 asset 切成 2 个 window
+- 每个 window 都跑 `chromaprint + mert-v1-95m + muq-base`
+
+### 14.1 逻辑结构
+
+```text
+song(1001)
+  -> asset(2001, master.wav)
+    -> window(3001, 0-5000)
+      -> chromaprint
+      -> mert-v1-95m
+      -> muq-base
+    -> window(3002, 2500-7500)
+      -> chromaprint
+      -> mert-v1-95m
+      -> muq-base
+  -> asset(2002, ugc_clip.mp3)
+    -> window(3003, 10000-15000)
+      -> chromaprint
+      -> mert-v1-95m
+      -> muq-base
+    -> window(3004, 12500-17500)
+      -> chromaprint
+      -> mert-v1-95m
+      -> muq-base
+```
+
+### 14.2 会落成多少行
+
+| 表 | 行数 | 说明 |
+|---|---:|---|
+| `media_entity` | 1 | 一个 song |
+| `audio_object` | 6 | 2 个 asset + 4 个 window |
+| `feature_fact` | 12 | 4 个 window × 3 个模型 |
+| `set_membership` | 视需要 | 可给 song/asset/window 挂 reference_set |
+
+### 14.3 查询某个 song 的全量树状数据
+
+```sql
+select s.entity_id as song_id,
+       s.title,
+       a.object_id as asset_id,
+       a.storage_uri,
+       w.object_id as window_id,
+       w.start_ms,
+       w.end_ms,
+       ff.feature_type,
+       ff.model_name,
+       ff.model_version,
+       ff.feature_set_name
+from media_entity s
+join audio_object a
+  on a.song_id = s.entity_id
+ and a.object_type = 'asset'
+join audio_object w
+  on w.parent_object_id = a.object_id
+ and w.object_type = 'window'
+left join feature_fact ff
+  on ff.object_id = w.object_id
+where s.entity_id = :song_id
+order by a.object_id, w.start_ms, ff.feature_type, ff.model_name;
+```
+
+### 14.4 查询哪些 window 缺某个模型
+
+这个 SQL 很适合做补算任务扫描，比如检查哪些 window 还没跑 `muq-base`：
+
+```sql
+select w.object_id as window_id,
+       w.song_id,
+       w.parent_object_id as asset_id,
+       w.start_ms,
+       w.end_ms
+from audio_object w
+where w.object_type = 'window'
+  and not exists (
+      select 1
+      from feature_fact ff
+      where ff.object_id = w.object_id
+        and ff.feature_type = 'embedding'
+        and ff.model_name = 'muq-base'
+        and ff.model_version = 'hf-main'
+        and ff.feature_set_name = 'muq_5s_hop2.5_v1'
+  )
+order by w.song_id, w.parent_object_id, w.start_ms;
+```
+
+### 14.5 查询某个 asset 下每个 window 已经具备哪些模型
+
+```sql
+select w.object_id as window_id,
+       w.start_ms,
+       w.end_ms,
+       string_agg(ff.model_name || ':' || ff.feature_type, ', ' order by ff.model_name) as ready_features
+from audio_object w
+left join feature_fact ff
+  on ff.object_id = w.object_id
+where w.object_type = 'window'
+  and w.parent_object_id = :asset_id
+group by w.object_id, w.start_ms, w.end_ms
+order by w.start_ms;
+```