feat(scripts): add backfill for missing trend strategy snapshots

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

tests/test_backfill_trend_snapshots.py

@@ -0,0 +1,22 @@
+"""Tests for trend strategy snapshot backfill helpers."""
+from scripts.backfill_trend_strategy_snapshots import (
+    infer_exit_price,
+    resolve_result_label,
+)
+
+
+def test_infer_exit_price_short_stop_loss():
+    exit_p = infer_exit_price("short", 0.336, 4.85, 10, -2.45)
+    assert exit_p is not None
+    assert abs(exit_p - 0.353) < 0.002
+
+
+def test_resolve_result_label_from_plan_status():
+    plan = {"status": "stopped_sl", "message": "stopped_sl"}
+    assert resolve_result_label(plan, None) == "止损"
+
+
+def test_resolve_result_label_prefers_plan_status():
+    plan = {"status": "stopped_sl"}
+    trade = {"result": "移动止盈"}
+    assert resolve_result_label(plan, trade) == "止损"