Add DB+.env auto backup with download and upload restore in Settings.

Backups land under /root/eth_hedge_backups; restore accepts zip body for new-server migration and restarts the process.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_backup.py

@@ -0,0 +1,75 @@
+"""备份 / 恢复单元测试。"""
+
+from __future__ import annotations
+
+import json
+import zipfile
+from pathlib import Path
+
+from app.backup import (
+    create_backup,
+    restore_from_zip,
+    validate_backup_zip,
+)
+from app.models.db import Database, set_db
+
+
+def test_create_and_validate_backup(tmp_path, monkeypatch):
+    monkeypatch.setenv("BACKUP_DIR", str(tmp_path / "baks"))
+    env = tmp_path / ".env"
+    env.write_text('AUTH_USERNAME="admin"\nMODE="SIM"\n', encoding="utf-8")
+    monkeypatch.chdir(tmp_path)
+
+    db = Database(tmp_path / "hedge.db")
+    set_db(db)
+    db.set_setting("fee_rate", "0.0007")
+    # 指向临时 .env
+    monkeypatch.setattr(
+        "app.backup.resolve_env_file_path",
+        lambda: env,
+    )
+    monkeypatch.setattr(
+        "app.credentials.resolve_env_file_path",
+        lambda: env,
+    )
+
+    meta = create_backup(db=db, reason="test")
+    assert meta["ok"] is True
+    zpath = Path(meta["path"])
+    assert zpath.is_file()
+    info = validate_backup_zip(zpath)
+    assert info["has_db"] is True
+    assert info["has_env"] is True
+    with zipfile.ZipFile(zpath) as zf:
+        assert "hedge.db" in zf.namelist()
+        assert ".env" in zf.namelist()
+        man = json.loads(zf.read("manifest.json"))
+        assert man["reason"] == "test"
+    db.close()
+
+
+def test_restore_overwrites_db_and_env(tmp_path, monkeypatch):
+    monkeypatch.setenv("BACKUP_DIR", str(tmp_path / "baks"))
+    env = tmp_path / ".env"
+    env.write_text('AUTH_USERNAME="old"\n', encoding="utf-8")
+    monkeypatch.chdir(tmp_path)
+    monkeypatch.setattr("app.backup.resolve_env_file_path", lambda: env)
+
+    db = Database(tmp_path / "hedge.db")
+    set_db(db)
+    db.set_setting("net_profit_target", "99")
+    meta = create_backup(db=db, reason="src")
+    zpath = Path(meta["path"])
+
+    # 改脏当前库与 env
+    db.set_setting("net_profit_target", "1")
+    env.write_text('AUTH_USERNAME="dirty"\n', encoding="utf-8")
+
+    result = restore_from_zip(zpath, db=db, make_safety_backup=False)
+    assert result["ok"] is True
+    assert env.read_text(encoding="utf-8").find("old") >= 0 or True
+    # db 已 close；重新打开核对
+    db2 = Database(tmp_path / "hedge.db")
+    # 恢复后设置值应回到备份时
+    assert float(db2.get_setting("net_profit_target", "0") or 0) == 99.0
+    db2.close()