{"library":"alembic","install":[{"cmd":"pip install alembic","imports":["# In alembic/env.py — MUST import your models for autogenerate to work\nfrom myapp.models import Base  # import all models so metadata is populated\ntarget_metadata = Base.metadata\n\n# If models are in multiple files, import them all:\nfrom myapp.models.user import User\nfrom myapp.models.post import Post\n# then:\ntarget_metadata = Base.metadata","# CLI commands — run from project root\nalembic init alembic          # create alembic directory\nalembic revision --autogenerate -m 'initial'  # generate migration\nalembic upgrade head           # apply all pending migrations\nalembic downgrade -1           # roll back one migration\nalembic history                # show migration history\nalembic current                # show current DB version"]}]}