bvandeusenandClaude Opus 5.5
6d8db0bb65
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instance_identity is one row made by migration 0127 with a random id, so an instance has it before its first account. A full backup carries it in its header as instance_id (the tar manifest header and the JSON top level); BACKUP_VERSION is 28. The table rides in _NOT_INCLUDED: a restore decides from the header value rather than copying a row. Two stores with the same id number their rows the same way. That is what lets a later step roll a live instance back by original id, refuse a backup whose ids would land on unrelated rows, and have a fresh-instance restore adopt the backup's id (adopt_instance_id). Milestone 582, step 1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
"""instance identity — the id lineage a backup carries
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Revision ID: 0127
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Revises: 0126
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Create Date: 2026-11-05
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One row naming this database's id lineage. Every full backup carries it, a
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restore into a fresh instance adopts it (the restore keeps the original ids),
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and rolling a live instance back requires the backup's to match, so a backup's
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ids never land on unrelated rows. Made here with a random value, so every
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instance has one before its first account exists.
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"""
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import sqlalchemy as sa
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from alembic import op
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revision = "0127"
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down_revision = "0126"
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branch_labels = None
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depends_on = None
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def upgrade() -> None:
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op.create_table(
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"instance_identity",
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sa.Column("id", sa.Integer(), primary_key=True),
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sa.Column("instance_id", sa.Text(), nullable=False),
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sa.Column(
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"created_at", sa.DateTime(timezone=True), nullable=False,
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server_default=sa.func.now(),
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),
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sa.CheckConstraint("id = 1", name="ck_instance_identity_single_row"),
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)
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op.execute(
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"INSERT INTO instance_identity (id, instance_id) VALUES (1, gen_random_uuid()::text)"
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)
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def downgrade() -> None:
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op.drop_table("instance_identity")
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