Improve the UI and training

services/forecasting/app/models/forecasts.py

@@ -5,7 +5,7 @@
 Forecast models for the forecasting service
 """
 
-from sqlalchemy import Column, String, Integer, Float, DateTime, Boolean, Text, JSON
+from sqlalchemy import Column, String, Integer, Float, DateTime, Boolean, Text, JSON, UniqueConstraint, Index
 from sqlalchemy.dialects.postgresql import UUID
 from datetime import datetime, timezone
 import uuid
@@ -15,7 +15,18 @@ from shared.database.base import Base
 class Forecast(Base):
     """Forecast model for storing prediction results"""
     __tablename__ = "forecasts"
-    
+
+    __table_args__ = (
+        # Unique constraint to prevent duplicate forecasts
+        # Ensures only one forecast per (tenant, product, date, location) combination
+        UniqueConstraint(
+            'tenant_id', 'inventory_product_id', 'forecast_date', 'location',
+            name='uq_forecast_tenant_product_date_location'
+        ),
+        # Composite index for common query patterns
+        Index('ix_forecasts_tenant_product_date', 'tenant_id', 'inventory_product_id', 'forecast_date'),
+    )
+
     id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
     tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)
     inventory_product_id = Column(UUID(as_uuid=True), nullable=False, index=True)  # Reference to inventory service