Add Alembic migration foundation

migrations/README

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+Generic single-database configuration.

migrations/env.py

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+from logging.config import fileConfig
+
+from sqlalchemy import pool
+from sqlalchemy import engine_from_config
+
+from alembic import context
+
+# Import Base and models so Alembic can see all tables for autogenerate.
+from app.db import Base
+import app.models  # noqa: F401 — registers Box, Item, SubItem on Base.metadata
+
+config = context.config
+
+# Dynamically set sqlalchemy.url from app config (not hardcoded in alembic.ini).
+# When called programmatically via app.migrate.run_migrations(), the URL is
+# already set on the Config object — respect it.  Fall back to get_settings()
+# only when invoked from the ``alembic`` CLI.
+from app.config import get_settings
+
+if not config.get_main_option("sqlalchemy.url"):
+    settings = get_settings()
+    config.set_main_option("sqlalchemy.url", settings.database_url)
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=True,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}

migrations/versions/57af90893f55_v1_baseline.py

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+"""V1 baseline
+
+Revision ID: 57af90893f55
+Revises: 
+Create Date: 2026-06-01 13:49:15.867487
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '57af90893f55'
+down_revision: Union[str, Sequence[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('boxes',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=100), nullable=False),
+    sa.Column('note', sa.Text(), nullable=True),
+    sa.Column('room', sa.String(length=100), nullable=True),
+    sa.Column('status', sa.String(length=50), nullable=True),
+    sa.Column('image_blob', sa.LargeBinary(), nullable=True),
+    sa.Column('image_mime_type', sa.String(length=50), nullable=True),
+    sa.Column('image_width', sa.Integer(), nullable=True),
+    sa.Column('image_height', sa.Integer(), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    with op.batch_alter_table('boxes', schema=None) as batch_op:
+        batch_op.create_index(batch_op.f('ix_boxes_id'), ['id'], unique=False)
+
+    op.create_table('items',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('box_id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=100), nullable=False),
+    sa.Column('note', sa.Text(), nullable=True),
+    sa.Column('quantity', sa.Integer(), nullable=True),
+    sa.Column('is_container', sa.Boolean(), nullable=False),
+    sa.Column('image_blob', sa.LargeBinary(), nullable=True),
+    sa.Column('image_mime_type', sa.String(length=50), nullable=True),
+    sa.Column('image_width', sa.Integer(), nullable=True),
+    sa.Column('image_height', sa.Integer(), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=False),
+    sa.ForeignKeyConstraint(['box_id'], ['boxes.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    with op.batch_alter_table('items', schema=None) as batch_op:
+        batch_op.create_index(batch_op.f('ix_items_id'), ['id'], unique=False)
+
+    op.create_table('subitems',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('parent_item_id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=100), nullable=False),
+    sa.Column('note', sa.Text(), nullable=True),
+    sa.Column('quantity', sa.Integer(), nullable=True),
+    sa.Column('image_blob', sa.LargeBinary(), nullable=True),
+    sa.Column('image_mime_type', sa.String(length=50), nullable=True),
+    sa.Column('image_width', sa.Integer(), nullable=True),
+    sa.Column('image_height', sa.Integer(), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=False),
+    sa.ForeignKeyConstraint(['parent_item_id'], ['items.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    with op.batch_alter_table('subitems', schema=None) as batch_op:
+        batch_op.create_index(batch_op.f('ix_subitems_id'), ['id'], unique=False)
+
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('subitems', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('ix_subitems_id'))
+
+    op.drop_table('subitems')
+    with op.batch_alter_table('items', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('ix_items_id'))
+
+    op.drop_table('items')
+    with op.batch_alter_table('boxes', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('ix_boxes_id'))
+
+    op.drop_table('boxes')
+    # ### end Alembic commands ###