feat(subscribe): add episode priority tracking for subscription updates

database/versions/9caa49cb3e10_2_2_6.py

@@ -0,0 +1,42 @@
+"""2.2.6
+为订阅洗版增加按集优先级状态
+
+Revision ID: 9caa49cb3e10
+Revises: b8f6e3a1c2d4
+Create Date: 2026-05-12
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "9caa49cb3e10"
+down_revision = "b8f6e3a1c2d4"
+branch_labels = None
+depends_on = None
+
+
+def _has_column(inspector: sa.Inspector, table_name: str, column_name: str) -> bool:
+    if table_name not in inspector.get_table_names():
+        return False
+    return any(column["name"] == column_name for column in inspector.get_columns(table_name))
+
+
+def upgrade() -> None:
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribe", "episode_priority") is False:
+        op.add_column("subscribe", sa.Column("episode_priority", sa.JSON(), nullable=True))
+
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribehistory", "episode_priority") is False:
+        op.add_column("subscribehistory", sa.Column("episode_priority", sa.JSON(), nullable=True))
+
+
+def downgrade() -> None:
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribehistory", "episode_priority"):
+        op.drop_column("subscribehistory", "episode_priority")
+
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribe", "episode_priority"):
+        op.drop_column("subscribe", "episode_priority")