perf(execution): prewarm tab session pools and report perceived wait

apps/desktop/src/composables/__tests__/useNavigationTargets.store.spec.ts

@@ -9,6 +9,7 @@ const mocks = vi.hoisted(() => ({
     activeConnectionId: "",
     getConfig: vi.fn((connectionId: string) => ({ id: connectionId, db_type: "postgres" })),
     ensureConnected: vi.fn(),
+    warmConnection: vi.fn(),
     connectionIdentifierQuote: vi.fn(() => undefined),
     // 与真实 store 一致：setTableMeta 记录连接元数据代次
     metadataGenerationFor: vi.fn(() => 0),

apps/desktop/src/composables/__tests__/useSidebarDataOpenRuntime.spec.ts

@@ -15,6 +15,7 @@ const mocks = vi.hoisted(() => ({
   openDataTabsNextToActive: false,
   metadataGeneration: 0,
   ensureConnected: vi.fn(),
+  warmConnection: vi.fn(),
   executeTabSql: vi.fn(),
   loadTableMetadata: vi.fn(),
   buildTableSelectSql: vi.fn(),
@@ -26,6 +27,7 @@ vi.mock("@/stores/connectionStore", () => ({
   useConnectionStore: () => ({
     getConfig: () => ({ id: "connection-1", db_type: mocks.databaseType }),
     ensureConnected: mocks.ensureConnected,
+    warmConnection: mocks.warmConnection,
     connectionIdentifierQuote: () => undefined,
     metadataGenerationFor: () => mocks.metadataGeneration,
   }),
@@ -237,6 +239,19 @@ describe("useSidebarDataOpenRuntime", () => {
     expect(mocks.tabs).toHaveLength(2);
   });
 
+  it("prewarms the tab session pool before the first page is fetched", async () => {
+    await useSidebarDataOpenRuntime().openData(tableNode);
+
+    const createdTab = mocks.tabs[0]!;
+    // The tab executes on its own session pool; warming it up front keeps the
+    // connection setup off the critical path of the visible loading spinner.
+    expect(mocks.warmConnection).toHaveBeenCalledWith("connection-1", {
+      database: "app",
+      catalog: undefined,
+      clientSessionId: createdTab.id,
+    });
+  });
+
   it("keeps adjacent placement for every tab created in always-new mode", async () => {
     mocks.dataTabReuseMode = "always-new";
     mocks.openDataTabsNextToActive = true;

apps/desktop/src/composables/useSidebarDataOpenRuntime.ts

@@ -17,6 +17,7 @@ import { tableOpenPageLimit } from "@/lib/table/tableOpenPageLimit";
 import { tableDataLargeValuePreviewOptions } from "@/lib/dataGrid/dataGridLargeValues";
 import { canActivateExistingDataTableTab } from "@/lib/tabs/dataTabActivation";
 import { beginDataTabNavigation, endDataTabNavigation, isCurrentDataTabNavigation } from "@/lib/tabs/dataTabNavigationGeneration";
+import { dataTabExecutionDatabase } from "@/lib/table/dataTabExecutionDatabase";
 
 const DATA_TAB_METADATA_TTL_MS = TABLE_METADATA_CACHE_TTL_MS;
 
@@ -60,6 +61,21 @@ export function useSidebarDataOpenRuntime() {
       });
       lastPhaseAt = now;
     };
+    // Each data tab executes on its own session-scoped pool
+    // (`<connection>:<database>[:catalog:..]:session:<tabId>`), so its first Run
+    // pays a fresh database connection. On a remote link that setup costs
+    // hundreds of milliseconds of round trips and lands on the critical path of
+    // the page fetch the user is waiting for. Start it in the background as soon
+    // as the tab exists (and again once the connection is up) so it overlaps the
+    // table-metadata load instead of the visible loading spinner.
+    const warmTabSessionPool = (targetTabId: string) => {
+      if (!config) return;
+      connectionStore.warmConnection(node.connectionId, {
+        database: dataTabExecutionDatabase(config, node.database, node.catalog),
+        catalog: node.catalog,
+        clientSessionId: targetTabId,
+      });
+    };
     openDataLog("info", "start", {
       traceId,
       type: node.type,
@@ -215,6 +231,7 @@ export function useSidebarDataOpenRuntime() {
     })();
     openDataLog("info", "tab-created", { traceId, tabId, elapsed: elapsed() });
     logPhase("tab-created", { tabId });
+    warmTabSessionPool(tabId);
     // 接管该 tab：登记本次导航代次，作废在途的 openTableTarget/openData 旧代次
     // ——旧导航即使目标身份相同（同表不同 whereInput）也不得再落地
     const navigationToken = beginDataTabNavigation(tabId);
@@ -312,6 +329,7 @@ export function useSidebarDataOpenRuntime() {
       }
       openDataLog("info", "ensure-connected:done", { traceId, elapsed: elapsed() });
       logPhase("ensure-connected", { tabId });
+      warmTabSessionPool(tabId);
       if (!config) throw new Error("Connection config not found");
 
       const limit = tableOpenPageLimit(settingsStore.editorSettings.tableOpenPageSize);