feat(up): capture follower snapshots at ingest and backfill history

tests/test_cli.py

@@ -51,7 +51,7 @@ def test_init_and_status():
         path = write_config(tmp)
         code, output = run_cli(["init", "--config", str(path)])
         assert code == 0
-        assert '"schema_version": 3' in output
+        assert '"schema_version": 4' in output
 
         db = Database(Path(tmp) / "app.db")
         db.initialize()
@@ -319,6 +319,19 @@ def test_candidates_and_discover_commands():
         assert '"notified": 1' in output
 
 
+def test_backfill_followers_dry_run():
+    with tempfile.TemporaryDirectory() as tmp:
+        path = write_config(tmp, cookie="", csrf="")
+        code, output = run_cli([
+            "backfill-followers", "--dry-run", "--config", str(path),
+        ])
+        assert code == 0
+        assert '"requested": 0' in output
+        assert '"failed": 0' in output
+        assert '"dry_run": true' in output
+        assert '"total": 0' in output
+
+
 def main_test():
     test_init_and_status()
     test_missing_config()
@@ -331,7 +344,8 @@ def main_test():
     test_default_command_starts_web_and_scheduler()
     test_snapshot_backup_failure_returns_error_and_retries()
     test_candidates_and_discover_commands()
-    print("OK: CLI init/sync/snapshot/auth-check/run/status/错误路径测试全部通过")
+    test_backfill_followers_dry_run()
+    print("OK: CLI init/sync/snapshot/auth-check/run/status/backfill/错误路径测试全部通过")
 
 
 if __name__ == "__main__":