Add authenticated global economic calendar with Jin10 fallback

Collect macroeconomic releases, events and holidays through the official browser SDK with resumable history from 2025. Preserve evidence, revisions and observation times, and merge verified series with official fields taking priority.

Add category filters, field provenance, coverage and connection status. Verify calendar persistence and deployment recovery in isolated acceptance checks.

backend/alembic/versions/20261031_a8b1cd465ef3_jin10_calendar.py

@@ -0,0 +1,28 @@
+"""Register the authenticated global calendar and resumable daily coverage."""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision = "a8b1cd465ef3"
+down_revision = "f7a0bc354de2"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table("jin10_sync_days", sa.Column("day", sa.Date(), primary_key=True),
+                    sa.Column("captured_at", sa.DateTime(timezone=True), nullable=False),
+                    sa.Column("counts", postgresql.JSONB(), nullable=False))
+    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": "jin10", "name": "金十·全球宏观日历", "list_url": "https://rili.jin10.com/",
+                             "collector": "calendar", "enabled": True, "interval_seconds": 10,
+                             "backfill_hours": 72, "consecutive_failures": 0}])
+
+
+def downgrade() -> None:
+    op.execute("DELETE FROM sources WHERE code = 'jin10'")
+    op.drop_table("jin10_sync_days")