"""backup_blob: which library files are already in the off-site bucket.

One row per (destination, sha256) sent. The media backup's work list is every
image and attachment sha with no row for the current destination, so a run is
incremental and resumable by construction, and pointing backups at a new
bucket starts that bucket's copy from the beginning.

backup_run.last_progress_at is the heartbeat of a run that spans hours; the
stall sweep measures a media run's silence from it, not from its start.

Revision ID: 0121
Revises: 0120
Create Date: 2026-11-07

"""
import sqlalchemy as sa
from alembic import op

revision = "0121"
down_revision = "0120"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "backup_blob",
        sa.Column("target", sa.Text(), nullable=False),
        sa.Column("sha256", sa.String(64), nullable=False),
        sa.Column("key", sa.Text(), nullable=False),
        sa.Column("size_bytes", sa.BigInteger(), nullable=False),
        sa.Column(
            "uploaded_at", sa.DateTime(timezone=True), nullable=False,
            server_default=sa.text("now()"),
        ),
        sa.PrimaryKeyConstraint("target", "sha256", name=op.f("pk_backup_blob")),
    )
    op.add_column(
        "backup_run",
        sa.Column("last_progress_at", sa.DateTime(timezone=True), nullable=True),
    )


def downgrade() -> None:
    op.drop_column("backup_run", "last_progress_at")
    op.drop_table("backup_blob")