58 lines
2.5 KiB
MySQL
58 lines
2.5 KiB
MySQL
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-- Migration 157: Fix thread_keys - restore correct per-conversation grouping
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-- Migration 156 Step 2 incorrectly forced ALL emails in a SAG to share one thread_key.
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-- This migration restores the correct thread_key based on actual email conversation headers.
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-- Step 1: Restore thread_key for emails that have a Graph conversationId stored
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-- (these were overwritten by the dominant-thread backfill).
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-- The conversationId is the most reliable conversation identifier from Exchange/Graph.
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-- Step 2: Re-derive thread_keys from actual email headers.
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-- Priority: conversationId (if provider) > parent's thread_key > References[0] > In-Reply-To > message_id
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-- We re-derive for ALL emails to undo the forced unification.
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-- First, recalculate based on actual References/In-Reply-To parent chain.
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-- For emails that are replies (have in_reply_to or email_references), adopt the
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-- thread_key of the ACTUAL parent email (matched by message_id), not just any email in the SAG.
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UPDATE email_messages child
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SET thread_key = parent.thread_key,
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updated_at = CURRENT_TIMESTAMP
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FROM email_messages parent
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WHERE child.deleted_at IS NULL
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AND parent.deleted_at IS NULL
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AND parent.thread_key IS NOT NULL
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AND TRIM(parent.thread_key) != ''
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AND (
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-- Match via in_reply_to -> parent message_id
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(
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child.in_reply_to IS NOT NULL
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AND TRIM(child.in_reply_to) != ''
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AND LOWER(REGEXP_REPLACE(parent.message_id, '[<>\s]', '', 'g'))
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= LOWER(REGEXP_REPLACE(
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(REGEXP_SPLIT_TO_ARRAY(TRIM(child.in_reply_to), E'[\\s,]+'))[1],
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'[<>\s]', '', 'g'
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))
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)
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OR
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-- Match via first reference -> parent message_id
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(
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child.email_references IS NOT NULL
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AND TRIM(child.email_references) != ''
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AND LOWER(REGEXP_REPLACE(parent.message_id, '[<>\s]', '', 'g'))
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= LOWER(REGEXP_REPLACE(
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(REGEXP_SPLIT_TO_ARRAY(TRIM(child.email_references), E'[\\s,]+'))[1],
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'[<>\s]', '', 'g'
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))
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)
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);
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-- For emails that are conversation starters (no in_reply_to, no references),
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-- reset thread_key to their own message_id so they start their own thread.
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UPDATE email_messages
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SET thread_key = LOWER(REGEXP_REPLACE(COALESCE(message_id, ''), '[<>\s]', '', 'g')),
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updated_at = CURRENT_TIMESTAMP
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WHERE deleted_at IS NULL
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AND (in_reply_to IS NULL OR TRIM(in_reply_to) = '')
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AND (email_references IS NULL OR TRIM(email_references) = '')
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AND message_id IS NOT NULL
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AND TRIM(message_id) != '';
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