Add delete for closed trade records.

Only closed groups can be removed from local history; equity is unchanged.

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

backend/tests/test_delete_trade_group.py

@@ -0,0 +1,92 @@
+"""删除单条已平仓交易记录。"""
+
+from __future__ import annotations
+
+import asyncio
+
+import pytest
+from fastapi import HTTPException
+
+from app.api.trades import delete_group
+from app.models.db import Database
+
+
+def _seed_closed(db: Database, gid: str = "G-DEL-1") -> None:
+    with db._lock:
+        db._conn.execute(
+            """INSERT INTO groups(group_id, status, open_at_ms, close_at_ms, realized_pnl)
+               VALUES (?, 'closed', 1, 2, 1.5)""",
+            (gid,),
+        )
+        db._conn.execute(
+            """INSERT INTO fills(group_id, leg, action, side, inst_id, qty_eth,
+               fill_px, fee, slip, notional, ts_ms)
+               VALUES (?, 'option', 'open', 'buy', 'ETH-C', 1, 10, 0.1, 0, 10, 1)""",
+            (gid,),
+        )
+        db._conn.execute(
+            """INSERT INTO residual_options(
+                 group_id, option_inst_id, option_side, option_qty_eth,
+                 option_entry_px, status, created_at_ms
+               ) VALUES (?, 'ETH-C', 'call', 1, 10, 'pending', 1)""",
+            (gid,),
+        )
+        db._conn.execute(
+            """INSERT INTO ledger_entries(group_id, kind, amount, balance_after, note, ts_ms)
+               VALUES (?, 'pnl', 1.5, 10001.5, 't', 2)""",
+            (gid,),
+        )
+        db._conn.commit()
+
+
+def test_delete_closed_group(tmp_path, monkeypatch) -> None:
+    monkeypatch.setenv("MODE", "SIM")
+    db = Database(tmp_path / "del.db")
+    monkeypatch.setattr("app.api.trades.get_db", lambda: db)
+    _seed_closed(db)
+
+    out = asyncio.run(delete_group("G-DEL-1", _user="t"))
+    assert out["ok"] is True
+    assert db.fetchone("SELECT COUNT(*) AS c FROM groups")["c"] == 0
+    assert db.fetchone("SELECT COUNT(*) AS c FROM fills")["c"] == 0
+    assert db.fetchone("SELECT COUNT(*) AS c FROM residual_options")["c"] == 0
+    assert db.fetchone("SELECT COUNT(*) AS c FROM ledger_entries")["c"] == 0
+    db.close()
+
+
+def test_delete_open_group_refused(tmp_path, monkeypatch) -> None:
+    monkeypatch.setenv("MODE", "SIM")
+    db = Database(tmp_path / "del_open.db")
+    monkeypatch.setattr("app.api.trades.get_db", lambda: db)
+    with db._lock:
+        db._conn.execute(
+            """INSERT INTO groups(group_id, status, open_at_ms)
+               VALUES ('G-OPEN', 'open', 1)"""
+        )
+        db._conn.commit()
+
+    with pytest.raises(HTTPException) as ei:
+        asyncio.run(delete_group("G-OPEN", _user="t"))
+    assert ei.value.status_code == 409
+    assert db.fetchone("SELECT COUNT(*) AS c FROM groups")["c"] == 1
+    db.close()
+
+
+def test_delete_active_position_refused(tmp_path, monkeypatch) -> None:
+    monkeypatch.setenv("MODE", "SIM")
+    db = Database(tmp_path / "del_pos.db")
+    monkeypatch.setattr("app.api.trades.get_db", lambda: db)
+    _seed_closed(db, "G-POS")
+    with db._lock:
+        # status closed but still referenced (edge)
+        db._conn.execute(
+            "UPDATE positions SET group_id=?, status='open' WHERE id=1",
+            ("G-POS",),
+        )
+        db._conn.commit()
+
+    with pytest.raises(HTTPException) as ei:
+        asyncio.run(delete_group("G-POS", _user="t"))
+    assert ei.value.status_code == 409
+    assert db.fetchone("SELECT COUNT(*) AS c FROM groups")["c"] == 1
+    db.close()