diff --git a/src/components/editor/SQLEditor.tsx b/src/components/editor/SQLEditor.tsx
index ad253536..86cb511c 100644
--- a/src/components/editor/SQLEditor.tsx
+++ b/src/components/editor/SQLEditor.tsx
@@ -4,7 +4,7 @@ import { useCallback, useEffect, useLayoutEffect, useRef } from "react";
 import { useSchemaCompletion } from "../../hooks/useSchemaCompletion";
 import { statementRange } from "../../lib/error-marker";
 import { monacoThemeData, monacoThemeName } from "../../lib/monaco-theme";
-import { runConnectionId } from "../../lib/run-connection";
+import { liveConnectionIds, runConnectionId } from "../../lib/run-connection";
 import { createCompletionProvider } from "../../lib/schema-completion-provider";
 import { formatSql } from "../../lib/sql-format";
 import { sqlAtCursor } from "../../lib/statement-at-cursor";
@@ -13,7 +13,6 @@ import { setPendingContentFlush, useEditorStore } from "../../stores/editorStore
 import { useResultStore } from "../../stores/resultStore";
 import { useSchemaStore } from "../../stores/schemaStore";
 import { useSettingsStore } from "../../stores/settingsStore";
-import { useSqliteStore } from "../../stores/sqliteStore";
 import { useThemeStore } from "../../stores/themeStore";
 
 /**
@@ -27,14 +26,10 @@ import { useThemeStore } from "../../stores/themeStore";
 function activeTabContext(): { connectionId?: string; database?: string; session?: string } {
   const { tabs, activeTabId } = useEditorStore.getState();
   const tab = tabs.find((t) => t.id === activeTabId);
-  const { selectedConnectionId, activeConnections } = useConnectionStore.getState();
-  const live = [
-    ...activeConnections.map((c) => c.id),
-    ...useSqliteStore.getState().sessions.map((s) => s.id),
-  ];
+  const { selectedConnectionId } = useConnectionStore.getState();
   return {
     // The server the tab is marked with, not whichever is selected (#788).
-    connectionId: runConnectionId(tab, selectedConnectionId, live),
+    connectionId: runConnectionId(tab, selectedConnectionId, liveConnectionIds()),
     database: tab?.database,
     session: tab?.type === "query" ? tab.id : undefined,
   };
diff --git a/src/components/layout/useStartupReconnect.ts b/src/components/layout/useStartupReconnect.ts
index 02c0a4af..ed5c8ad7 100644
--- a/src/components/layout/useStartupReconnect.ts
+++ b/src/components/layout/useStartupReconnect.ts
@@ -17,7 +17,7 @@ export function useStartupReconnect() {
       const { tabs, setTabConnection: setTabConn } = useEditorStore.getState();
       const profileIds = [
         ...new Set(
-          tabs.filter((t) => t.profileId).map((t) => t.profileId!),
+          tabs.flatMap((t) => (t.profileId ? [t.profileId] : [])),
         ),
       ];
 
diff --git a/src/hooks/__tests__/useLiveConnectionIds.test.ts b/src/hooks/__tests__/useLiveConnectionIds.test.ts
new file mode 100644
index 00000000..8d246334
--- /dev/null
+++ b/src/hooks/__tests__/useLiveConnectionIds.test.ts
@@ -0,0 +1,51 @@
+import { act, renderHook } from "@testing-library/react";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { liveConnectionIds } from "../../lib/run-connection";
+import { useConnectionStore } from "../../stores/connectionStore";
+import { type SqliteSession, useSqliteStore } from "../../stores/sqliteStore";
+import type { ConnectionInfo } from "../../types";
+import { useLiveConnectionIds } from "../useLiveConnectionIds";
+
+vi.mock("@tauri-apps/api/core", () => ({ invoke: vi.fn() }));
+
+const server = (id: string) => ({ id }) as unknown as ConnectionInfo;
+const file = (id: string) => ({ id }) as unknown as SqliteSession;
+
+beforeEach(() => {
+  useConnectionStore.setState({ activeConnections: [] });
+  useSqliteStore.setState({ sessions: [] });
+});
+
+describe("useLiveConnectionIds", () => {
+  it("lists connected servers and open SQLite files", () => {
+    useConnectionStore.setState({ activeConnections: [server("dev")] });
+    useSqliteStore.setState({ sessions: [file("sqlite-1")] });
+
+    const { result } = renderHook(() => useLiveConnectionIds());
+
+    expect(result.current).toEqual(["dev", "sqlite-1"]);
+  });
+
+  it("follows servers and files as they come and go", () => {
+    const { result } = renderHook(() => useLiveConnectionIds());
+    expect(result.current).toEqual([]);
+
+    act(() => useConnectionStore.setState({ activeConnections: [server("dev"), server("prod")] }));
+    act(() => useSqliteStore.setState({ sessions: [file("sqlite-1")] }));
+    expect(result.current).toEqual(["dev", "prod", "sqlite-1"]);
+
+    act(() => useConnectionStore.setState({ activeConnections: [server("prod")] }));
+    expect(result.current).toEqual(["prod", "sqlite-1"]);
+  });
+
+  // Where a run goes and whether a tab's connection still counts (#944) read
+  // one list each; they must not drift apart.
+  it("is the same list as liveConnectionIds", () => {
+    useConnectionStore.setState({ activeConnections: [server("dev")] });
+    useSqliteStore.setState({ sessions: [file("sqlite-1"), file("sqlite-2")] });
+
+    const { result } = renderHook(() => useLiveConnectionIds());
+
+    expect(result.current).toEqual(liveConnectionIds());
+  });
+});
diff --git a/src/hooks/useLiveConnectionIds.ts b/src/hooks/useLiveConnectionIds.ts
new file mode 100644
index 00000000..ff9aa530
--- /dev/null
+++ b/src/hooks/useLiveConnectionIds.ts
@@ -0,0 +1,22 @@
+import { useMemo } from "react";
+import { useConnectionStore } from "../stores/connectionStore";
+import { useSqliteStore } from "../stores/sqliteStore";
+
+/**
+ * Every connection that can run a statement right now, for a component: the
+ * connected servers and the open SQLite files.
+ *
+ * `liveConnectionIds` (lib/run-connection) is the same list read once, for
+ * code outside a component. This one re-renders its caller when a server
+ * connects or disconnects or a file opens or closes. Both have to stay the
+ * same list: where a run goes and whether a tab's connection still counts
+ * (#944) depend on it.
+ */
+export function useLiveConnectionIds(): string[] {
+  const activeConnections = useConnectionStore((s) => s.activeConnections);
+  const sqliteSessions = useSqliteStore((s) => s.sessions);
+  return useMemo(
+    () => [...activeConnections.map((c) => c.id), ...sqliteSessions.map((s) => s.id)],
+    [activeConnections, sqliteSessions],
+  );
+}
diff --git a/src/hooks/useQueryExecution.ts b/src/hooks/useQueryExecution.ts
index 07a82f9a..e151f607 100644
--- a/src/hooks/useQueryExecution.ts
+++ b/src/hooks/useQueryExecution.ts
@@ -3,7 +3,7 @@ import { runConnectionId } from "../lib/run-connection";
 import { useConnectionStore } from "../stores/connectionStore";
 import { useEditorStore } from "../stores/editorStore";
 import { useResultStore } from "../stores/resultStore";
-import { useSqliteStore } from "../stores/sqliteStore";
+import { useLiveConnectionIds } from "./useLiveConnectionIds";
 
 /**
  * The editor toolbar's execution context, pre-bound.
@@ -27,8 +27,7 @@ export function useQueryExecution() {
   const selectedConnectionId = useConnectionStore(
     (s) => s.selectedConnectionId,
   );
-  const activeConnections = useConnectionStore((s) => s.activeConnections);
-  const sqliteSessions = useSqliteStore((s) => s.sessions);
+  const liveConnectionIds = useLiveConnectionIds();
   const activeTabId = useEditorStore((s) => s.activeTabId);
   const tabs = useEditorStore((s) => s.tabs);
   const activeTab = tabs.find((t) => t.id === activeTabId);
@@ -41,10 +40,7 @@ export function useQueryExecution() {
   const isExecuting = useResultStore((s) => s.isExecuting);
 
   // The server the tab is marked with, not whichever is selected (#788).
-  const connectionId = runConnectionId(activeTab, selectedConnectionId, [
-    ...activeConnections.map((c) => c.id),
-    ...sqliteSessions.map((s) => s.id),
-  ]);
+  const connectionId = runConnectionId(activeTab, selectedConnectionId, liveConnectionIds);
   const database = activeTab?.database;
   // The tab's own server session, so what one run sets up is there for the
   // next (#731). Only a query tab has one; the others are views of an object.
diff --git a/src/hooks/useResultsFollowActiveTab.ts b/src/hooks/useResultsFollowActiveTab.ts
index 35cc4ec8..4a8e7342 100644
--- a/src/hooks/useResultsFollowActiveTab.ts
+++ b/src/hooks/useResultsFollowActiveTab.ts
@@ -3,7 +3,7 @@ import { runConnectionId } from "../lib/run-connection";
 import { useConnectionStore } from "../stores/connectionStore";
 import { useEditorStore } from "../stores/editorStore";
 import { useResultStore } from "../stores/resultStore";
-import { useSqliteStore } from "../stores/sqliteStore";
+import { useLiveConnectionIds } from "./useLiveConnectionIds";
 
 /**
  * Keep a grid read on one server from being shown under another (#842).
@@ -19,16 +19,12 @@ export function useResultsFollowActiveTab() {
   const activeTabId = useEditorStore((s) => s.activeTabId);
   const tabs = useEditorStore((s) => s.tabs);
   const selectedConnectionId = useConnectionStore((s) => s.selectedConnectionId);
-  const activeConnections = useConnectionStore((s) => s.activeConnections);
-  const sqliteSessions = useSqliteStore((s) => s.sessions);
+  const liveConnectionIds = useLiveConnectionIds();
   const dropForeignResults = useResultStore((s) => s.dropForeignResults);
 
   const activeTab = tabs.find((t) => t.id === activeTabId);
   // The tab's own server, as Run would pick it (#788).
-  const tabConnectionId = runConnectionId(activeTab, selectedConnectionId, [
-    ...activeConnections.map((c) => c.id),
-    ...sqliteSessions.map((s) => s.id),
-  ]);
+  const tabConnectionId = runConnectionId(activeTab, selectedConnectionId, liveConnectionIds);
 
   useEffect(() => {
     dropForeignResults(tabConnectionId);