fix: close data integrity and hot-reload review findings

Backfill same-day snapshots for newly added or restored videos, preserve successful fan snapshots on resume, persist incomplete state before forced re-runs, and split collection completion from backup completion so failed backups can retry without API calls. Reject missing data payloads instead of treating them as empty folders, guard against mass-unfav on suspicious empty remote folders, rebuild Bilibili clients when credentials change, recompute primary folder ownership from active relations with per-folder fav_time, preserve original titles for dropped invalid videos, poll config every 60 seconds, and fix favsort verify interval and mixed resource types.

reaction_board/cli.py

@@ -21,6 +21,7 @@ from typing import Sequence
 
 from .bilibili.auth_flow import AuthService
 from .bilibili.client import BilibiliClient, Pacer
+from .bilibili.provider import ClientProvider
 from .config import ConfigError, ConfigStore
 from .database import Database
 from .logging_json import JsonLogger
@@ -53,6 +54,11 @@ def _build_parser() -> argparse.ArgumentParser:
     sync.add_argument(
         "--full", action="store_true", help="强制全量刷新元数据（忽略 6 小时周期）"
     )
+    sync.add_argument(
+        "--allow-empty-folder",
+        action="store_true",
+        help="允许把远端 0 条视为真实清空（默认按异常跳过差集）",
+    )
     snapshot = sub.add_parser(
         "snapshot", parents=[common], help="采集当日七项快照与粉丝数"
     )
@@ -72,6 +78,11 @@ def _build_parser() -> argparse.ArgumentParser:
     run.add_argument(
         "--once", action="store_true", help="只执行一次到期任务后退出"
     )
+    run.add_argument(
+        "--allow-empty-folder",
+        action="store_true",
+        help="允许把远端 0 条视为真实清空（默认按异常跳过差集）",
+    )
     sub.add_parser("status", parents=[common], help="查看数据库状态（离线）")
     return parser
 
@@ -130,7 +141,13 @@ def cmd_sync(args, logger: JsonLogger) -> int:
     try:
         repo = Repository(db)
         client = _client(cfg.bilibili.read, logger)
-        service = FolderSyncService(store, repo, client, logger=logger)
+        service = FolderSyncService(
+            store,
+            repo,
+            client,
+            logger=logger,
+            allow_empty_folders=args.allow_empty_folder,
+        )
         summary = service.run(full_refresh=args.full)
         payload = summary.as_dict()
         payload["database"] = str(cfg.storage.database_path)
@@ -157,7 +174,7 @@ def cmd_snapshot(args, logger: JsonLogger) -> int:
         payload["snapshot_counts"] = repo.snapshot_counts(summary.stat_date)
         payload["counts"] = repo.counts()
         _print(payload)
-        return 0 if summary.completed else 1
+        return 0 if summary.completed and not summary.backup_error else 1
     finally:
         db.close()
 
@@ -205,16 +222,26 @@ def cmd_run(args, logger: JsonLogger) -> int:
     last: dict[str, object] = {}
     try:
         repo = Repository(db)
-        folder_client = _client(cfg.bilibili.read, logger)
-        folder_service = FolderSyncService(store, repo, folder_client, logger=logger)
-        snapshot_client = _client(cfg.bilibili.read, logger, pacer=Pacer(1.0, 1.6), retries=1)
-        snapshot_service = SnapshotService(store, repo, snapshot_client, logger=logger)
-
-        def run_sync():
-            summary = folder_service.run()
-            last["folder"] = summary
-            logger.info("folder_sync.summary", **summary.as_dict())
-            return summary
+        folder_provider = ClientProvider(
+            store, "read", lambda credentials: _client(credentials, logger)
+        )
+        snapshot_provider = ClientProvider(
+            store,
+            "read",
+            lambda credentials: _client(
+                credentials, logger, pacer=Pacer(1.0, 1.6), retries=1
+            ),
+        )
+        folder_service = FolderSyncService(
+            store,
+            repo,
+            client_provider=folder_provider,
+            logger=logger,
+            allow_empty_folders=args.allow_empty_folder,
+        )
+        snapshot_service = SnapshotService(
+            store, repo, client_provider=snapshot_provider, logger=logger
+        )
 
         def run_snapshot():
             summary = snapshot_service.run_if_needed()
@@ -222,6 +249,22 @@ def cmd_run(args, logger: JsonLogger) -> int:
             logger.info("snapshot.summary", **summary.as_dict())
             return summary
 
+        def run_sync():
+            summary = folder_service.run()
+            last["folder"] = summary
+            logger.info("folder_sync.summary", **summary.as_dict())
+            # 新入库/恢复的视频立即补当天快照，而不是等到次日。
+            if summary.added > 0:
+                run_snapshot()
+            return summary
+
+        def run_config_watch():
+            before = store.revision
+            store.get()
+            if store.revision != before:
+                logger.info("config.reloaded", revision=store.revision)
+            return {"revision": store.revision}
+
         hh, mm = parse_hhmm(cfg.schedule.snapshot_at)
         snapshot_at = f"{hh:02d}:{mm:02d}"
         scheduler = Scheduler(
@@ -238,6 +281,7 @@ def cmd_run(args, logger: JsonLogger) -> int:
                     next_run=0.0,
                     next_run_fn=lambda started: next_daily_run(started, snapshot_at),
                 ),
+                ScheduledTask("config_watch", 60.0, run_config_watch),
             ],
             logger=logger,
         )
@@ -275,6 +319,8 @@ def cmd_status(args, logger: JsonLogger) -> int:
             "last_completed": repo.kv_get("snapshot:last_completed"),
             "auth_ok": repo.kv_get("auth:ok"),
             "auth_message": repo.kv_get("auth:message"),
+            "backup_ok": repo.kv_get(f"snapshot:backup:{today}"),
+            "backup_error": repo.kv_get(f"snapshot:backup_error:{today}"),
         })
         _print({
             "ok": True,