added alembic revision and updated gitignore

.gitignore

@@ -1,5 +1,6 @@
-venv/
+venv
 *secret*
 dexorder.toml
-./contract
+/contract
 .idea
+__pycache__

alembic/versions/1da309899f95_.py

@@ -0,0 +1,44 @@
+"""empty message
+
+Revision ID: 1da309899f95
+Revises: 
+Create Date: 2023-09-18 19:18:11.706312
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = '1da309899f95'
+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:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('block',
+    sa.Column('chain', sa.Integer(), nullable=False),
+    sa.Column('height', sa.Integer(), nullable=False),
+    sa.Column('hash', sa.LargeBinary(), nullable=False),
+    sa.Column('parent', sa.LargeBinary(), nullable=False),
+    sa.Column('data', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.PrimaryKeyConstraint('chain', 'height', 'hash')
+    )
+    op.drop_table('migrations')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('migrations',
+    sa.Column('id', sa.INTEGER(), autoincrement=True, nullable=False),
+    sa.Column('name', sa.VARCHAR(length=255), autoincrement=False, nullable=False),
+    sa.Column('run_on', postgresql.TIMESTAMP(), autoincrement=False, nullable=False),
+    sa.PrimaryKeyConstraint('id', name='migrations_pkey')
+    )
+    op.drop_table('block')
+    # ### end Alembic commands ###