新增课程起止日期管理

backend/alembic/versions/20260813_0006_certificate_course_period.py

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+"""add certificate course period
+
+Revision ID: 20260813_0006
+Revises: 20260623_0005
+Create Date: 2026-08-13
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "20260813_0006"
+down_revision: Union[str, None] = "20260623_0005"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("certificates", sa.Column("course_start_date", sa.Date(), nullable=True))
+    op.add_column("certificates", sa.Column("course_end_date", sa.Date(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("certificates", "course_end_date")
+    op.drop_column("certificates", "course_start_date")