added alembic database migrations, json import/export

alembic/versions/fd4f39482990_create_all_tables.py

@@ -0,0 +1,30 @@
+"""Create all tables
+
+Revision ID: fd4f39482990
+Revises: cf94fca21104
+Create Date: 2025-09-28 12:15:02.412270
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'fd4f39482990'
+down_revision: Union[str, None] = 'cf94fca21104'
+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! ###
+    pass
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    pass
+    # ### end Alembic commands ###