"""backups plugin baseline (real create).

Built after the ADR-008 ownership cutover, so unlike the ten cutover plugins
whose 0001 is a stamp-only anchor, this baseline genuinely CREATES the table.
The core chain never knew about backuprevisions, so this per-plugin chain is its
sole authoritative creator.

Emits explicit Alembic ops rather than using the create_plugin_tables helper:
the helper builds a per-plugin MetaData filtered to the plugin's own tables, so
the foreign key to the core assets table cannot resolve at CreateTable-compile
time (NoReferencedTableError). Same shape autogenerate produces. Tables inherit
the connection's default charset, matching how the core chain creates its own.
"""
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = 'backups0001baseline'
down_revision = None
branch_labels = None
depends_on = None


def upgrade():
    op.create_table(
        'backuprevisions',
        sa.Column('backuprevisionid', sa.Integer(), nullable=False),
        sa.Column('assetid', sa.Integer(), nullable=False),
        sa.Column('backupkind', sa.String(length=50), nullable=False),
        sa.Column('storagebackend', sa.String(length=20), nullable=False,
                  server_default='shopdb'),
        sa.Column('contenthash', sa.String(length=64), nullable=False),
        sa.Column('payloadjson', sa.Text(length=16777215), nullable=True),
        sa.Column('sharepath', sa.String(length=500), nullable=True),
        sa.Column('sourcefilename', sa.String(length=255), nullable=True),
        sa.Column('bytesize', sa.Integer(), nullable=True),
        sa.Column('sourcehostname', sa.String(length=255), nullable=True),
        sa.Column('collectedat', sa.DateTime(), nullable=True),
        sa.Column('createdat', sa.DateTime(), nullable=False),
        sa.ForeignKeyConstraint(['assetid'], ['assets.assetid'],
                                ondelete='CASCADE'),
        sa.PrimaryKeyConstraint('backuprevisionid'),
    )
    op.create_index('ixbackuprevisionsassetid', 'backuprevisions', ['assetid'])
    op.create_index('ixbackuprevisionsbackupkind', 'backuprevisions',
                    ['backupkind'])
    op.create_index('ixbackuprevisionscontenthash', 'backuprevisions',
                    ['contenthash'])
    # The dedup read path is "latest revision for this asset+kind", so the
    # composite index is the one that actually gets used on every collector post.
    op.create_index('ixbackuprevisionsassetkind', 'backuprevisions',
                    ['assetid', 'backupkind'])


def downgrade():
    op.drop_index('ixbackuprevisionsassetkind', table_name='backuprevisions')
    op.drop_index('ixbackuprevisionscontenthash', table_name='backuprevisions')
    op.drop_index('ixbackuprevisionsbackupkind', table_name='backuprevisions')
    op.drop_index('ixbackuprevisionsassetid', table_name='backuprevisions')
    op.drop_table('backuprevisions')