diff --git a/src/resources/extensions/sf/commands-todo.js b/src/resources/extensions/sf/commands-todo.js
index 524d6cf5b..ec0a5009c 100644
--- a/src/resources/extensions/sf/commands-todo.js
+++ b/src/resources/extensions/sf/commands-todo.js
@@ -19,7 +19,7 @@ import {
 import { dirname, join } from "node:path";
 import { projectRoot } from "./commands/context.js";
 import { sfRoot } from "./paths.js";
-import { addBacklogItem, isDbAvailable, openDatabase } from "./sf-db.js";
+import { addBacklogItem, openDatabase } from "./sf-db.js";
 
 const _EMPTY_TODO = "# TODO\n\nDump anything here.\n";
 const MAX_DUMP_CHARS = 48_000;
@@ -301,11 +301,9 @@ function appendBacklogItems(basePath, titles, triageRunId) {
 	const date = new Date().toISOString().slice(0, 10);
 	const triagedAt = new Date().toISOString();
 	const backlogItems = [];
-	if (!isDbAvailable()) {
-		const root = sfRoot(basePath);
-		mkdirSync(root, { recursive: true });
-		openDatabase(join(root, "sf.db"));
-	}
+	const root = sfRoot(basePath);
+	mkdirSync(root, { recursive: true });
+	openDatabase(join(root, "sf.db"));
 	for (const title of cleanTitles) {
 		const cleanTitle = title.replace(/^['"]|['"]$/g, "");
 		const id = addBacklogItem({
diff --git a/src/resources/extensions/sf/tests/commands-todo-db.test.mjs b/src/resources/extensions/sf/tests/commands-todo-db.test.mjs
new file mode 100644
index 000000000..d86be1406
--- /dev/null
+++ b/src/resources/extensions/sf/tests/commands-todo-db.test.mjs
@@ -0,0 +1,60 @@
+/**
+ * commands-todo-db.test.mjs — TODO triage backlog DB binding coverage.
+ *
+ * Purpose: prove TODO triage backlog promotion writes to the requested project
+ * SQLite DB instead of reusing a previously-open DB from another project.
+ */
+import assert from "node:assert/strict";
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, test } from "vitest";
+import { triageTodoDump } from "../commands-todo.js";
+import { closeDatabase, listBacklogItems, openDatabase } from "../sf-db.js";
+
+const tmpRoots = [];
+
+afterEach(() => {
+	closeDatabase();
+	for (const root of tmpRoots.splice(0)) {
+		rmSync(root, { recursive: true, force: true });
+	}
+});
+
+function makeProject() {
+	const root = mkdtempSync(join(tmpdir(), "sf-todo-db-"));
+	mkdirSync(join(root, ".sf"), { recursive: true });
+	tmpRoots.push(root);
+	return root;
+}
+
+function backlogTitles(project) {
+	closeDatabase();
+	openDatabase(join(project, ".sf", "sf.db"));
+	return listBacklogItems().map((item) => item.title);
+}
+
+test("triageTodoDump_with_backlog_when_db_already_open_writes_requested_project_db", async () => {
+	const first = makeProject();
+	const second = makeProject();
+	openDatabase(join(first, ".sf", "sf.db"));
+	writeFileSync(join(second, "TODO.md"), "# TODO\n\nadd project-local task\n");
+	const response = JSON.stringify({
+		summary: "triaged",
+		eval_candidates: [],
+		implementation_tasks: ["add project-local task"],
+		memory_requirements: [],
+		harness_suggestions: [],
+		docs_or_tests: [],
+		unclear_notes: [],
+	});
+
+	await triageTodoDump(second, async () => response, {
+		clear: false,
+		backlog: true,
+		date: new Date("2026-05-07T00:00:00.000Z"),
+	});
+
+	assert.deepEqual(backlogTitles(first), []);
+	assert.deepEqual(backlogTitles(second), ["add project-local task"]);
+});