56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
 
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"""repair thread counters left stale by server-side flag changes and expunges
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`threads.unread_count`, `pinned` and `message_count` are denormalized from the
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thread's messages. Two sync paths updated messages without recomputing them: a
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flag change reported by the server (mail read on a phone, or filed by a
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server-side rule) and a QRESYNC expunge. The row then disagreed with its own
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messages — the message list showing a message as unread that the reading pane
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showed as read, and only a manual "mark as read" reconciling it.
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The code paths are fixed; this repairs rows that already drifted. Recomputes from
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the messages themselves, so it is safe to run on a healthy database: threads that
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already agree are left untouched.
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Revision ID: 0018
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Revises: 0017
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Create Date: 2026-09-18
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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 = "0018"
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down_revision: str | None = "0017"
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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(
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r"""
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UPDATE threads t
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SET unread_count = s.unread,
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pinned = s.pinned,
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message_count = s.total
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FROM (
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SELECT thread_id,
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count(*) AS total,
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count(*) FILTER (WHERE NOT ('\Seen' = ANY(flags))) AS unread,
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bool_or('\Flagged' = ANY(flags)) AS pinned
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FROM messages
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WHERE thread_id IS NOT NULL
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GROUP BY thread_id
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) AS s
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WHERE t.id = s.thread_id
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AND (t.unread_count, t.pinned, t.message_count) IS DISTINCT FROM
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(s.unread, s.pinned, s.total)
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"""
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)
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def downgrade() -> None:
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"""Nothing to undo: this only makes rows agree with the messages they describe."""
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