add sqlmodel + alembic + setup models skeleton to slowly enable transition towards a db

crawler/alembic/versions/0e804449c31d_create_listing_table.py

@@ -0,0 +1,35 @@
+"""Create listing table
+
+Revision ID: 0e804449c31d
+Revises: 
+Create Date: 2025-06-03 19:54:41.526943
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '0e804449c31d'
+down_revision: Union[str, None] = None
+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.create_table('listing',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('listing')
+    # ### end Alembic commands ###