feat(status): default legacy batches to normal

app/db.py

@@ -16,6 +16,8 @@ from .config import make_slug
 
 
 DEFAULT_BUSY_TIMEOUT_MS = 5000
+PRODUCT_STATUS_FEATURE_INTRODUCED_AT = "2026-07-18T16:34:37"
+LEGACY_PRODUCT_STATUS_DEFAULT_NOTE = "历史批次默认按架上商品处理（未实时检测）"
 VALID_BATCH_FIELDS = {
     "source_files_json",
     "status",
@@ -493,6 +495,7 @@ def init_db(path=None, conn=None) -> None:
             _ensure_task_image_task_columns(database)
             _ensure_task_cover_reset_columns(database)
             _ensure_task_product_status_columns(database)
+            _migrate_legacy_product_status_defaults(database)
             _ensure_image_studio_project_suite_columns(database)
             _ensure_image_studio_project_draft_columns(database)
             _ensure_image_studio_job_recovery_columns(database)
@@ -534,6 +537,32 @@ def _ensure_task_product_status_columns(database):
         database.execute("ALTER TABLE tasks ADD COLUMN product_status_at TEXT")
 
 
+def _migrate_legacy_product_status_defaults(database):
+    """Treat pre-status-feature active batches as historically on-shelf once."""
+
+    database.execute(
+        """
+        UPDATE tasks
+        SET product_status = 'normal',
+            product_status_note = ?,
+            product_status_at = NULL,
+            updated_at = ?
+        WHERE (product_status IS NULL OR TRIM(product_status) = '')
+          AND batch_id IN (
+              SELECT id
+              FROM batches
+              WHERE deleted_at IS NULL
+                AND created_at < ?
+          )
+        """,
+        (
+            LEGACY_PRODUCT_STATUS_DEFAULT_NOTE,
+            _now(),
+            PRODUCT_STATUS_FEATURE_INTRODUCED_AT,
+        ),
+    )
+
+
 def _ensure_image_studio_project_suite_columns(database):
     columns = {
         row["name"]