Add database migration for job progress columns

alembic/versions/004_add_job_progress_columns.py

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+"""Add job progress tracking columns
+
+Revision ID: 004
+Revises: 003
+Create Date: 2025-01-15
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '004'
+down_revision: Union[str, None] = '003'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Add new progress tracking columns to jobs table."""
+    # Add current_stage column (alias for stage compatibility)
+    op.add_column('jobs', sa.Column('current_stage', sa.String(), nullable=True, server_default='queued'))
+
+    # Add status_message column for progress messages
+    op.add_column('jobs', sa.Column('status_message', sa.String(), nullable=True))
+
+    # Add updated_at column for tracking last update
+    op.add_column('jobs', sa.Column('updated_at', sa.DateTime(), nullable=True))
+
+    # Add processing_stats column for detailed stats (JSON)
+    op.add_column('jobs', sa.Column('processing_stats', sa.JSON(), nullable=True))
+
+    # Sync current_stage with existing stage values
+    op.execute("UPDATE jobs SET current_stage = stage WHERE current_stage IS NULL")
+
+
+def downgrade() -> None:
+    """Remove progress tracking columns from jobs table."""
+    op.drop_column('jobs', 'processing_stats')
+    op.drop_column('jobs', 'updated_at')
+    op.drop_column('jobs', 'status_message')
+    op.drop_column('jobs', 'current_stage')