Share Telegram channels across sections

alembic/versions/0011_channel_aliases.py

@@ -0,0 +1,43 @@
+"""channel aliases across department sections
+
+Revision ID: 0011
+Revises: 0010
+Create Date: 2026-06-08
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0011"
+down_revision: Union[str, None] = "0010"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("channels", sa.Column("source_channel_id", sa.Integer(), nullable=True))
+    op.create_foreign_key(
+        "fk_channels_source_channel_id",
+        "channels",
+        "channels",
+        ["source_channel_id"],
+        ["id"],
+        ondelete="SET NULL",
+    )
+    op.drop_constraint("channels_identifier_key", "channels", type_="unique")
+    op.create_unique_constraint(
+        "uq_channels_section_identifier",
+        "channels",
+        ["section_id", "identifier"],
+    )
+    op.create_index("ix_channels_source_channel_id", "channels", ["source_channel_id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_channels_source_channel_id", table_name="channels")
+    op.drop_constraint("uq_channels_section_identifier", "channels", type_="unique")
+    op.create_unique_constraint("channels_identifier_key", "channels", ["identifier"])
+    op.drop_constraint("fk_channels_source_channel_id", "channels", type_="foreignkey")
+    op.drop_column("channels", "source_channel_id")