Add official monthly ADP calendar collection

backend/alembic/versions/20261031_f7a0bc354de2_adp_calendar.py

@@ -0,0 +1,25 @@
+"""Register the official monthly ADP calendar source."""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "f7a0bc354de2"
+down_revision = "e6f9ab243cd1"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    source = sa.table("sources", *[sa.column(key, kind) for key, kind in [
+        ("code", sa.String), ("name", sa.String), ("list_url", sa.String), ("collector", sa.String),
+        ("enabled", sa.Boolean), ("interval_seconds", sa.Integer), ("backfill_hours", sa.Integer),
+        ("consecutive_failures", sa.Integer),
+    ]])
+    op.bulk_insert(source, [{"code": "adp", "name": "ADP·月度私营就业报告",
+                             "list_url": "https://mediacenter.adp.com/press-releases?keywords=National+Employment+Report",
+                             "collector": "calendar", "enabled": True, "interval_seconds": 3600,
+                             "backfill_hours": 72, "consecutive_failures": 0}])
+
+
+def downgrade() -> None:
+    # Existing raw responses prevent source deletion through their foreign key.
+    op.execute("DELETE FROM sources WHERE code = 'adp'")