diff --git a/crates/utopia-server/src/mappings.rs b/crates/utopia-server/src/mappings.rs
index 209be09e8..ec66432c1 100644
--- a/crates/utopia-server/src/mappings.rs
+++ b/crates/utopia-server/src/mappings.rs
@@ -15,6 +15,39 @@ use uuid::Uuid;
 
 const MAX_SCHEMA_CHARS: usize = 12_000;
 
+/// 探索把 schema 里的量与维度落成 Metric / Dimension 实体，而这两个类不在任何
+/// 内置本体包里——0009 之后建库不再自带类。没有它们，下面的 `type_id` 查不到，
+/// 每条提议都被 `continue` 吞掉，页面只说"已排队"就再无下文（#223）。
+/// 所以探索前把两个类补上：builtin，描述给抽取提示词，本体页可以改
+async fn ensure_concept_types(pool: &sqlx::PgPool, kb_id: Uuid) -> anyhow::Result<()> {
+    for (key, label, description) in [
+        (
+            "metric",
+            "Metric",
+            "An aggregatable business quantity (revenue, order count, average ticket) that              maps to a definition in a mounted database.",
+        ),
+        (
+            "dimension",
+            "Dimension",
+            "A group-by attribute (region, month, product line) that maps to a column in a              mounted database.",
+        ),
+    ] {
+        sqlx::query(
+            "INSERT INTO entity_types (id, kb_id, key, label, builtin, description)
+             SELECT $1, $2, $3, $4, TRUE, $5
+             WHERE NOT EXISTS (SELECT 1 FROM entity_types WHERE kb_id = $2 AND key = $3)",
+        )
+        .bind(Uuid::now_v7())
+        .bind(kb_id)
+        .bind(key)
+        .bind(label)
+        .bind(description)
+        .execute(pool)
+        .await?;
+    }
+    Ok(())
+}
+
 pub async fn explore_mappings(state: &AppState, kb_id: Uuid) -> anyhow::Result<()> {
     let kb = utopia_store::kbs::get(&state.pool, kb_id).await?;
     let settings = utopia_store::settings::get(&state.pool, kb.workspace_id)
@@ -27,6 +60,7 @@ pub async fn explore_mappings(state: &AppState, kb_id: Uuid) -> anyhow::Result<(
     if sources.is_empty() {
         anyhow::bail!("No data sources mounted");
     }
+    ensure_concept_types(&state.pool, kb_id).await?;
 
     // 各源 schema（引擎直读，保证新鲜；限量防 prompt 爆炸）
     let mut schema_txt = String::new();
@@ -168,6 +202,27 @@ pub async fn explore_mappings(state: &AppState, kb_id: Uuid) -> anyhow::Result<(
     }
 
     tracing::info!(%kb_id, proposals = accepted, "映射探索完成，提议已入审核队列");
+    // 一条都没提出来时页面上什么都不会变——Pending 还是 0，而"已排队"那句
+    // 早就翻篇了。走告警中心说一声，人才知道该去刷新结构或给列加注释
+    if accepted == 0 {
+        if let Err(e) = utopia_store::alerts::raise(
+            &state.pool,
+            utopia_store::alerts::NewAlert {
+                kb_id: Some(kb_id),
+                severity: "info",
+                kind: utopia_store::alerts::kind::MAPPING_EXPLORATION_EMPTY,
+                min_role: utopia_core::models::Role::Editor,
+                subject_type: None,
+                subject_id: None,
+                detail: serde_json::json!({ "proposals": 0, "sources": source_names }),
+            },
+        )
+        .await
+        {
+            tracing::warn!(%kb_id, error = %e, "映射探索空结果的告警没写进去");
+        }
+        state.emit_alert();
+    }
     state.emit_review(kb_id);
     Ok(())
 }
diff --git a/crates/utopia-store/src/alerts.rs b/crates/utopia-store/src/alerts.rs
index bc67a75ef..d4bbfe97a 100644
--- a/crates/utopia-store/src/alerts.rs
+++ b/crates/utopia-store/src/alerts.rs
@@ -51,6 +51,9 @@ pub mod kind {
     /// 哪些表——`query_data` 照样入列，模型却只能瞎猜列名。挂载那一刻的报错
     /// 只有点按钮的人看得见，此后这个库就一直这样静默地缺着。
     pub const SCHEMA_SYNC_FAILED: &str = "data_source.schema_sync_failed";
+    /// 库级：映射探索跑完了，一条口径都没提出来。`severity = info`，`min_role = editor`——
+    /// 不是故障，是"你在等的那件事没有结果"，而页面上没有别的地方能说这句话（#223）
+    pub const MAPPING_EXPLORATION_EMPTY: &str = "mapping.exploration_empty";
 }
 
 /// 一次故障。打包成结构体不只是为了参数个数——调用点写 `severity: "error"`
diff --git a/web/src/i18n/en.ts b/web/src/i18n/en.ts
index 6b180e1e6..613c9ad58 100644
--- a/web/src/i18n/en.ts
+++ b/web/src/i18n/en.ts
@@ -201,6 +201,10 @@ export const en = {
         title: "A data source is mounted, but its schema is not",
         hint: "Ask cannot see which tables exist, so it will guess column names. Check the connection, then use Refresh schema.",
       },
+      "mapping.exploration_empty": {
+        title: "Mapping exploration proposed nothing",
+        hint: "The model read the mounted schema but found no metric or dimension to propose. Refresh the schema under Data mapping > Data sources, add column comments if you can, then run Explore again.",
+      },
       "llm.unreachable": {
         title: "The model endpoint gave no usable answer",
         hint: "Extraction and embedding are stopped. Check the endpoint URL in system settings.",
@@ -1214,7 +1218,8 @@ export const en = {
     explore: "Explore mappings",
     exploreHint:
       "An agent reads these schemas and proposes metric and dimension definitions. Proposals land in Pending; Ask uses them only once confirmed.",
-    exploreQueued: "Exploration queued — proposals will appear under Pending.",
+    exploreQueued:
+      "Exploration queued — proposals will appear under Pending. If nothing can be proposed, the alert bell will say so.",
     sourcesEmpty: "No data sources mounted.",
     sourcesNoneAvailable:
       "No data sources registered yet — ask a deployment admin to register one.",
diff --git a/web/src/i18n/zh.ts b/web/src/i18n/zh.ts
index a598c9849..14c01d8e0 100644
--- a/web/src/i18n/zh.ts
+++ b/web/src/i18n/zh.ts
@@ -180,6 +180,10 @@ export const zh: Strings = {
         title: "数据源挂上了，库表结构没进来",
         hint: "问数看不见有哪些表，只能猜列名。检查连接串，然后点「刷新结构」。",
       },
+      "mapping.exploration_empty": {
+        title: "映射探索没有提出任何口径",
+        hint: "模型读了挂载的库表结构，但没找到可提的指标或维度。到「数据映射 > 数据源」刷新结构、给列加注释，再探索一次。",
+      },
       "llm.unreachable": {
         title: "模型端点没有给出可用的回答",
         hint: "抽取与向量化已停摆。去系统设置里检查端点地址。",
@@ -1095,7 +1099,7 @@ export const zh: Strings = {
     explore: "探查映射",
     exploreHint:
       "一个智能体读这些库表结构，提出指标／维度的口径。提出来的落在「待审批」，确认之后问数才会用。",
-    exploreQueued: "探查已排队——提案稍后出现在「待审批」。",
+    exploreQueued: "探索已排队，提议会出现在「待确认」里；一条都提不出来时，铃铛会告诉你。",
     sourcesEmpty: "没有挂载任何数据源。",
     sourcesNoneAvailable: "还没有登记数据源——请部署管理员登记一个。",
     newConn: "登记新连接",
diff --git a/web/src/useKbEvents.ts b/web/src/useKbEvents.ts
index 66b0e2322..c1d72f2b5 100644
--- a/web/src/useKbEvents.ts
+++ b/web/src/useKbEvents.ts
@@ -18,6 +18,8 @@ export function useKbEvents(kbId: string | undefined) {
     });
     es.addEventListener("review", () => {
       queryClient.invalidateQueries({ queryKey: ["review", kbId] });
+      // 映射探索跑完发的也是 review：Pending 那一栏得跟着刷新
+      queryClient.invalidateQueries({ queryKey: ["mappings", kbId] });
     });
     // 一句记忆抽出了等人点头的事实（0015）：对话里那张确认卡跟着长出来
     es.addEventListener("pending", () => {