Add personal notes, DeepSearch history, backup offload, and gateway auth throttling

Also streamline the top navigation: drop the Tools dropdown, make Quizzes
and Battles icon-only entries, and remove the Workspace, Containers and
Editor entry points from the project detail page.

tests/unit/services/backup/store.py

@@ -1,5 +1,6 @@
 # retoor <retoor@molodetz.nl>
 
+import os
 import tempfile
 from pathlib import Path
 
@@ -65,3 +66,90 @@ def test_rotate_schedule_never_removes_a_backup_without_a_confirmed_remote_copy(
     finally:
         store.delete_backup(older_uid)
         store.delete_backup(newer_uid)
+
+
+def _point_storage_at(monkeypatch, root: Path):
+    uploads = root / "uploads"
+    attachments = uploads / "attachments"
+    project_files = uploads / "project_files"
+    keys = root / "keys"
+    zips = root / "zips"
+    deepsearch = root / "deepsearch"
+    workspaces = root / "container_workspaces"
+    backups = root / "backups"
+    for path in (
+        attachments,
+        project_files,
+        keys,
+        zips,
+        deepsearch,
+        workspaces,
+        backups,
+    ):
+        path.mkdir(parents=True, exist_ok=True)
+    db_file = root / "devplace.db"
+    db_file.write_bytes(b"db")
+    tasks = root / "devii_tasks.db"
+    tasks.write_bytes(b"t")
+    lessons = root / "devii_lessons.db"
+    lessons.write_bytes(b"l")
+    (project_files / "a.bin").write_bytes(b"x" * 10)
+    (attachments / "b.bin").write_bytes(b"y" * 5)
+    monkeypatch.setattr(store.config, "DATA_DIR", root)
+    monkeypatch.setattr(store.config, "UPLOADS_DIR", uploads)
+    monkeypatch.setattr(store.config, "ATTACHMENTS_DIR", attachments)
+    monkeypatch.setattr(store.config, "PROJECT_FILES_DIR", project_files)
+    monkeypatch.setattr(store.config, "KEYS_DIR", keys)
+    monkeypatch.setattr(store.config, "ZIPS_DIR", zips)
+    monkeypatch.setattr(store.config, "DEEPSEARCH_DIR", deepsearch)
+    monkeypatch.setattr(store.config, "CONTAINER_WORKSPACES_DIR", workspaces)
+    monkeypatch.setattr(store.config, "BACKUPS_DIR", backups)
+    monkeypatch.setattr(store.config, "DEVII_TASKS_DB", tasks)
+    monkeypatch.setattr(store.config, "DEVII_LESSONS_DB", lessons)
+    monkeypatch.setattr(store.config, "DATABASE_URL", f"sqlite:///{db_file}")
+    store.clear_storage_stats_cache()
+    return {
+        "uploads": uploads,
+        "attachments": attachments,
+        "project_files": project_files,
+        "db_file": db_file,
+    }
+
+
+def test_disk_usage_does_not_walk(monkeypatch, tmp_path):
+    monkeypatch.setattr(store.config, "DATA_DIR", tmp_path)
+    store.clear_storage_stats_cache()
+
+    def boom(*_args, **_kwargs):
+        raise AssertionError("disk_usage must not walk the data tree")
+
+    monkeypatch.setattr(store.os, "walk", boom)
+    disk = store.disk_usage()
+    assert disk["total_bytes"] > 0
+    assert "used_percent" in disk
+
+
+def test_compute_storage_stats_walks_data_dir_once(local_db, monkeypatch, tmp_path):
+    root = tmp_path / "data"
+    _point_storage_at(monkeypatch, root)
+    walks = []
+    real_walk = os.walk
+
+    def counting_walk(path, *args, **kwargs):
+        walks.append(os.path.realpath(path))
+        return real_walk(path, *args, **kwargs)
+
+    monkeypatch.setattr(store.os, "walk", counting_walk)
+    stats = store.compute_storage_stats()
+    assert walks == [os.path.realpath(root)]
+    by_key = {row["key"]: row for row in stats["paths"]}
+    assert by_key["project_files"]["file_count"] == 1
+    assert by_key["project_files"]["size_bytes"] == 10
+    assert by_key["attachments"]["file_count"] == 1
+    assert by_key["uploads"]["file_count"] >= 2
+    assert by_key["database"]["file_count"] == 1
+    assert stats["data_dir"]["file_count"] >= 3
+    walks.clear()
+    again = store.compute_storage_stats()
+    assert walks == []
+    assert again["data_dir"]["file_count"] == stats["data_dir"]["file_count"]