Root cause analysis:
- The orchestration saga was failing at the 'fetch_shared_data_snapshot' step
- Lines 350-356 had a logic error: tried to import pandas in exception handler after pandas import already failed
- This caused an uncaught exception that propagated up and failed the entire saga
The fix:
- Replaced pandas DataFrame placeholder with a simple dict for traffic_predictions
- Since traffic predictions are marked as "not yet implemented", pandas is not needed yet
- This eliminates the pandas dependency from the orchestrator service
- When traffic predictions are implemented in Phase 5, the dict can be converted to DataFrame
Impact:
- Orchestration saga will no longer fail due to missing pandas
- AI enhancement warning will still appear (requires separate fix to add pandas to requirements if needed)
- Traffic predictions placeholder now uses empty dict instead of empty DataFrame
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