Update project 3 iteration feat: core booking pipeline, webhook and async pdf worker CORE COPLETE

backend/migrations/versions/a55d80c4b300_add_pdf_url_to_ticket.py

@@ -0,0 +1,32 @@
+"""add pdf_url to ticket
+
+Revision ID: a55d80c4b300
+Revises: 762b863b233b
+Create Date: 2026-03-06 10:24:14.795359
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'a55d80c4b300'
+down_revision: Union[str, Sequence[str], None] = '762b863b233b'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('tickets', sa.Column('pdf_url', sa.String(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('tickets', 'pdf_url')
+    # ### end Alembic commands ###