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

backend/migrations/versions/f8c2d6e1a4b7_job_run_after.py

@@ -0,0 +1,27 @@
+"""job run after
+
+Revision ID: f8c2d6e1a4b7
+Revises: c9e2a7f4b1d8
+Create Date: 2026-10-19 03:00:00.000000
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "f8c2d6e1a4b7"
+down_revision: str | None = "c9e2a7f4b1d8"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "jobs", sa.Column("run_after", sa.DateTime(timezone=True), nullable=True)
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("jobs", "run_after")