feat(growth): same-day 1-day baselines for new videos

Let 1-day view growth use a zero baseline for videos published today, and the first successful sample for older videos ingested today, without mixing those into 7/30-day rankings.

tests/test_migrations.py

@@ -38,8 +38,8 @@ def test_fresh_and_idempotent():
         conn = sqlite3.connect(Path(tmp) / "app.db")
         try:
             applied = run_migrations(conn)
-            assert applied == [1, 2, 3, 4, 5, 6, 7]
-            assert current_version(conn) == 7
+            assert applied == [1, 2, 3, 4, 5, 6, 7, 8]
+            assert current_version(conn) == 8
             assert EXPECTED_TABLES <= table_names(conn)
             assert "schema_version" in table_names(conn)
             columns = {
@@ -70,10 +70,14 @@ def test_fresh_and_idempotent():
             assert {
                 "stat_date", "ip", "path", "hits", "first_at", "last_at",
             } <= visit_columns
+            snapshot_columns = {
+                row[1] for row in conn.execute("PRAGMA table_info(snapshot)")
+            }
+            assert {"view_open", "open_captured_at"} <= snapshot_columns
             # 再跑一次不应重复应用
             assert run_migrations(conn) == []
             row = conn.execute("SELECT COUNT(*) FROM schema_version").fetchone()
-            assert row[0] == 7
+            assert row[0] == 8
         finally:
             conn.close()
 
@@ -88,15 +92,15 @@ def test_backup_before_upgrade():
             conn.execute("INSERT INTO kv(k, v) VALUES ('hello', 'world')")
             conn.commit()
 
-            v8 = Migration(8, "add probe", ("CREATE TABLE probe (id INTEGER PRIMARY KEY)",))
+            v9 = Migration(9, "add probe", ("CREATE TABLE probe (id INTEGER PRIMARY KEY)",))
             applied = run_migrations(
                 conn,
                 backup_dir=backup_dir,
                 now=1_800_000_000,
-                migrations=MIGRATIONS + (v8,),
+                migrations=MIGRATIONS + (v9,),
             )
-            assert applied == [8]
-            backups = list(backup_dir.glob("app-pre-v7-*.db"))
+            assert applied == [9]
+            backups = list(backup_dir.glob("app-pre-v8-*.db"))
             assert len(backups) == 1
             check = sqlite3.connect(backups[0])
             try:
@@ -181,13 +185,46 @@ def test_v5_normalizes_unfaved():
             )
             conn.commit()
             applied = run_migrations(conn)
-            assert applied == [5, 6, 7]
+            assert applied == [5, 6, 7, 8]
             rows = dict(conn.execute("SELECT aid, status FROM video").fetchall())
             assert rows == {1: "active", 2: "dropped"}
         finally:
             conn.close()
 
 
+def test_v8_backfills_view_open():
+    with tempfile.TemporaryDirectory() as tmp:
+        conn = sqlite3.connect(Path(tmp) / "app.db")
+        try:
+            run_migrations(conn, migrations=MIGRATIONS[:7])
+            conn.execute(
+                "INSERT INTO video(aid, title, pubdate, status, first_seen) "
+                "VALUES (1, 't', 1, 'active', 1)"
+            )
+            conn.execute(
+                'INSERT INTO snapshot(stat_date, aid, "view", captured_at, ok) '
+                "VALUES ('2026-10-31', 1, 500, 100, 1)"
+            )
+            conn.execute(
+                'INSERT INTO snapshot(stat_date, aid, "view", captured_at, ok) '
+                "VALUES ('2026-10-30', 1, NULL, 90, 0)"
+            )
+            conn.commit()
+            assert run_migrations(conn) == [8]
+            ok_row = conn.execute(
+                "SELECT view_open, open_captured_at FROM snapshot "
+                "WHERE stat_date='2026-10-31'"
+            ).fetchone()
+            assert ok_row[0] == 500 and ok_row[1] == 100
+            fail_row = conn.execute(
+                "SELECT view_open, open_captured_at FROM snapshot "
+                "WHERE stat_date='2026-10-30'"
+            ).fetchone()
+            assert fail_row[0] is None and fail_row[1] is None
+        finally:
+            conn.close()
+
+
 def main():
     test_fresh_and_idempotent()
     test_backup_before_upgrade()
@@ -195,6 +232,7 @@ def main():
     test_prune_backups()
     test_validate_migration_order()
     test_v5_normalizes_unfaved()
+    test_v8_backfills_view_open()
     print("OK: SQLite 迁移、备份与回滚测试全部通过")