修复：合并 alembic 两个 head(no-op merge 节点)

merge origin/main 后 coupon_claim_event(main)与 guide_video_user_seq_uq(本分支)
成两个 head,加 no-op merge 节点 d8dd2106e438 收敛为单 head。已在全新库上
alembic upgrade heads 验证整条链可应用。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

alembic/versions/d8dd2106e438_merge_guide_video_seq_uq_and_coupon_.py

@@ -0,0 +1,26 @@
+"""merge guide_video seq_uq and coupon_claim_event heads
+
+Revision ID: d8dd2106e438
+Revises: coupon_claim_event, guide_video_user_seq_uq
+Create Date: 2026-07-24 11:52:18.290731
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd8dd2106e438'
+down_revision: Union[str, Sequence[str], None] = ('coupon_claim_event', 'guide_video_user_seq_uq')
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass