feat(history): record what happens to a request

tests/test_import_flow.py

@@ -1185,3 +1185,38 @@ def test_version_endpoint_reports_a_build_stamp(client):
     assert data["version"]
     # "2026-09-01 15:43" - the newest source file, so a stale deploy stands out
     assert len(data["built_at"]) == 16 and data["built_at"][4] == "-"
+
+
+def test_history_records_what_happened_to_a_request(client):
+    root = client.tmp_path / "library" / "hist"
+    lib_id = client.post("/api/libraries", json={
+        "name": "hist", "media_type": "ebook", "root_path": str(root),
+        "folder_template": "{Title}", "file_template": "{Title}",
+    }).json()["id"]
+    req_id = client.post("/api/requests", json={
+        "library_id": lib_id, "title": "Momo"}).json()["id"]
+
+    gone = client.downloads / "gone.epub"
+    res = client.post("/api/import", json={"items": [{
+        "path": str(gone), "is_dir": False, "files": [str(gone)], "request_id": req_id,
+    }]}).json()["results"][0]
+    assert not res["ok"]
+
+    src = client.downloads / "Momo.epub"
+    src.write_bytes(b"x")
+    dest = client.post("/api/import", json={"items": [{
+        "path": str(src), "is_dir": False, "files": [str(src)], "request_id": req_id,
+    }]}).json()["results"][0]["dest"]
+    client.put(f"/api/requests/{req_id}", json={"library_id": lib_id, "title": "Momo 2"})
+    assert client.post(f"/api/requests/{req_id}/relocate").json()["moved"]
+    # a relocate that moves nothing is not worth a row
+    client.post(f"/api/requests/{req_id}/relocate")
+    client.delete(f"/api/requests/{req_id}")
+
+    rows = client.get("/api/history").json()
+    assert [r["event"] for r in rows] == ["deleted", "relocated", "imported", "failed"]
+    assert all(r["request_id"] == req_id for r in rows)
+    assert rows[0]["title"] == "Momo 2"  # survives the deleted request
+    assert rows[2]["dest"] == dest
+    assert rows[3]["message"]
+    assert rows[0]["at"].endswith("+00:00")