feat(welfare): savings/battle 返回 compare_count(累计完成比价次数)

- SavingsBattle 仓储/schema/接口新增 compare_count(= 有效记录数,与 order_count 同源)
- 更新 docs/api/savings-battle.md 与 tests/test_welfare.py 断言

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/api/v1/savings.py

@@ -42,6 +42,7 @@ def battle(user: CurrentUser, db: DbSession) -> SavingsBattleOut:
         week_saved_cents=b.week_saved_cents,
         beat_percent=b.beat_percent,
         streak_days=b.streak_days,
+        compare_count=b.compare_count,
     )
 
 

app/repositories/savings.py

@@ -52,6 +52,7 @@ class SavingsBattle:
     week_saved_cents: int  # 本周(周一起)已省
     beat_percent: int  # 超过百分之多少用户
     streak_days: int  # 连续省钱天数
+    compare_count: int  # 累计完成比价次数(= 有效记录数:真实用 compare 记录、否则 demo 兜底)
 
 
 def _local_date(dt: datetime):
@@ -163,7 +164,10 @@ def get_battle(db: Session, user_id: int) -> SavingsBattle:
     beat_percent = _compute_beat_percent(db, user_id)
 
     return SavingsBattle(
-        week_saved_cents=week_saved, beat_percent=beat_percent, streak_days=streak
+        week_saved_cents=week_saved,
+        beat_percent=beat_percent,
+        streak_days=streak,
+        compare_count=len(records),
     )
 
 

app/schemas/welfare.py

@@ -194,6 +194,7 @@ class SavingsBattleOut(BaseModel):
     week_saved_cents: int = Field(..., description="本周已省(分)")
     beat_percent: int = Field(..., description="超过百分之多少用户")
     streak_days: int = Field(..., description="连续省钱天数")
+    compare_count: int = Field(..., description="累计完成比价次数(= 比价上报记录数)")
 
 
 class SavingsRecordOut(BaseModel):

docs/api/savings-battle.md

@@ -13,6 +13,7 @@
 | `week_saved_cents` | int | 本周已省（分） |
 | `beat_percent` | int | 超过百分之多少用户 |
 | `streak_days` | int | 连续省钱天数 |
+| `compare_count` | int | 累计完成比价次数（= 比价上报记录数；有真实 `compare` 记录用真实数，否则 demo 兜底） |
 
 ## 说明
-「我的」页「省钱战绩」卡数据源。接口已通但无真实业务写入,实际多为 0。
+「我的」页「省钱战绩」卡数据源（三列：本周已省 / 完成比价 / 连续比价）。`compare_count` 与 `/summary` 的 `order_count` 同源（均 = 有效记录数），对应原型「完成比价(次)」列。接口已通但无真实业务写入时走 demo 兜底（seed 约 23 条）。

tests/test_welfare.py

@@ -226,6 +226,8 @@ def test_savings_summary_and_battle(client) -> None:
     assert b["streak_days"] >= 1
     assert b["week_saved_cents"] >= 0
     assert 0 <= b["beat_percent"] <= 100
+    # 完成比价次数与 summary 的 order_count 同源(均 = 有效记录数)
+    assert b["compare_count"] == s["order_count"]
 
 
 def test_savings_seeder_idempotent(client) -> None: