Journaling for all flights

backend/alembic/versions/002_local_flights.py

@@ -6,7 +6,8 @@ Create Date: 2025-12-12 12:00:00.000000
 
 This migration adds a new table for tracking local flights (circuits, local, departure)
 that don't require PPR submissions. Also adds etd and renames booked_out_dt to created_dt,
-and departure_dt to departed_dt for consistency.
+and departure_dt to departed_dt for consistency. Transforms journal table from PPR-specific
+to a generic polymorphic journal for all entity types.
 
 """
 from alembic import op
@@ -22,8 +23,41 @@ depends_on = None
 def upgrade() -> None:
     """
     Create local_flights, departures, and arrivals tables.
+    Transform journal table from PPR-specific to generic polymorphic journal.
     """
     
+    # Modify existing journal table to support all entity types
+    # First add new columns
+    op.add_column('journal', sa.Column('entity_type', sa.String(50), nullable=True))
+    op.add_column('journal', sa.Column('entity_id', sa.BigInteger(), nullable=True))
+    
+    # Migrate existing PPR journal entries: backfill entity_type and entity_id
+    op.execute("""
+        UPDATE journal SET 
+            entity_type = 'PPR',
+            entity_id = ppr_id
+        WHERE entity_type IS NULL
+    """)
+    
+    # Make new columns NOT NULL after migration
+    op.alter_column('journal', 'entity_type', nullable=False)
+    op.alter_column('journal', 'entity_id', nullable=False)
+    
+    # Make ip column nullable (new entries won't always have it)
+    op.alter_column('journal', 'ip', existing_type=sa.String(45), nullable=True)
+    
+    # Drop the old ppr_id column
+    op.drop_column('journal', 'ppr_id')
+    
+    # Add composite index for efficient queries
+    op.create_index('idx_entity_lookup', 'journal', ['entity_type', 'entity_id'])
+    
+    # Drop old index if it exists
+    try:
+        op.drop_index('idx_ppr_id', table_name='journal')
+    except:
+        pass
+    
     op.create_table('local_flights',
         sa.Column('id', sa.BigInteger(), autoincrement=True, nullable=False),
         sa.Column('registration', sa.String(length=16), nullable=False),