fix(userbot): job queue survives a consumer failure, a flood wait defers its job instead of holding the queue

backend/src/utils/db/models.py

@@ -203,6 +203,9 @@ class Job(SQLModel, table=True):
     finished_at: datetime | None = Field(
         default=None, sa_column=Column(DateTime(timezone=True))
     )
+    run_after: datetime | None = Field(
+        default=None, sa_column=Column(DateTime(timezone=True))
+    )
 
 
 class CapturePolicy(SQLModel, table=True):