feat: causal lab

backend/services/database.py

@@ -1238,6 +1238,16 @@ def init_db():
     except Exception:
         pass
 
+    # Purge macro_series_log entries from multi-country contamination.
+    # USD-series (UNRATE, PAYEMS…) were logging both US and foreign events → flip-flop.
+    # Safe to truncate: all data is synthetic backfill, no real live captures yet.
+    try:
+        c.execute(
+            "DELETE FROM macro_series_log WHERE source IN ('backfill', 'calendar_sync')"
+        )
+    except Exception:
+        pass
+
     conn.commit()
     conn.close()