39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
 
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"""add messages.delivery_id
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The real header Message-ID as delivered, kept even when message_id_hdr is
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synthesized for a cross-account duplicate (SPEC §7.1). It identifies a single
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delivery, so the same email delivered to several of the user's accounts can be
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collapsed to one row in the thread view. Backfilled from message_id_hdr for
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non-synthetic ids; synthetic rows are recovered from the raw blob by a script.
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Revision ID: 0011
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Revises: 0010
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Create Date: 2026-07-22
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"""
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from __future__ import annotations
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from collections.abc import Sequence
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from alembic import op
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revision: str = "0011"
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down_revision: str | None = "0010"
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branch_labels: str | Sequence[str] | None = None
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depends_on: str | Sequence[str] | None = None
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def upgrade() -> None:
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op.execute("ALTER TABLE messages ADD COLUMN delivery_id text")
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# Non-synthetic ids are the real Message-ID already; use them directly.
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op.execute(
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"UPDATE messages SET delivery_id = message_id_hdr "
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"WHERE message_id_hdr IS NOT NULL AND message_id_hdr NOT LIKE '%@synthetic.local'"
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)
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op.execute("CREATE INDEX ix_messages_delivery ON messages (user_id, delivery_id)")
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def downgrade() -> None:
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op.execute("DROP INDEX IF EXISTS ix_messages_delivery")
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op.execute("ALTER TABLE messages DROP COLUMN IF EXISTS delivery_id")
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