fix(tools): backfill fan counts in chronological order

tests/test_preview_seed.py

@@ -203,6 +203,13 @@ def test_seed_preview_end_to_end():
             assert conn.execute(
                 "SELECT 1 FROM up_blacklist WHERE mid=?", (FAKE_BLACKLIST_MID,)
             ).fetchone() is not None
+            up_rows = conn.execute(
+                "SELECT stat_date, follower FROM up_stat WHERE mid=37754047 "
+                "ORDER BY stat_date"
+            ).fetchall()
+            followers = [int(row["follower"]) for row in up_rows]
+            assert followers == sorted(followers), followers
+            assert len(followers) == 8
         finally:
             conn.close()
 

tools/seed_preview_db.py

@@ -327,10 +327,14 @@ def _seed_up_stats(
         follower = int(data.get("follower") or 0)
         following = data.get("following")
         current = follower
-        for offset in range(days, 0, -1):
-            stat_date = (latest_day - timedelta(days=offset)).isoformat()
+        # values[0] 对应 latest-1，values[-1] 对应 latest-days。
+        values: list[int] = []
+        for _ in range(days):
             decrement = max(1, int(round(current * rng.uniform(0.00015, 0.0006))))
             current = max(0, current - decrement)
+            values.append(current)
+        for offset in range(days, 0, -1):
+            stat_date = (latest_day - timedelta(days=offset)).isoformat()
             conn.execute(
                 """
                 INSERT OR REPLACE INTO up_stat(
@@ -340,7 +344,7 @@ def _seed_up_stats(
                 (
                     stat_date,
                     int(mid),
-                    current,
+                    values[offset - 1],
                     following,
                     int(_day_start(latest_day - timedelta(days=offset)) + 60),
                 ),