41 lines
1.1 KiB
MySQL
41 lines
1.1 KiB
MySQL
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-- Migration 142: Persistent thread key for reliable inbound case routing
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ALTER TABLE email_messages
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ADD COLUMN IF NOT EXISTS thread_key VARCHAR(500);
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-- Backfill thread_key for existing rows.
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-- Priority:
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-- 1) First token from References (root message id)
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-- 2) In-Reply-To
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-- 3) Message-ID
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UPDATE email_messages
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SET thread_key = LOWER(
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REGEXP_REPLACE(
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COALESCE(
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NULLIF(
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SPLIT_PART(
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REGEXP_REPLACE(COALESCE(email_references, ''), '^[\s<>,]+', ''),
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' ',
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1
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),
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''
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),
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NULLIF(in_reply_to, ''),
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NULLIF(message_id, '')
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),
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'[<>\s]',
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'',
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'g'
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)
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)
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WHERE (thread_key IS NULL OR TRIM(thread_key) = '')
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AND (
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COALESCE(NULLIF(email_references, ''), NULLIF(in_reply_to, ''), NULLIF(message_id, '')) IS NOT NULL
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);
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CREATE INDEX IF NOT EXISTS idx_email_messages_thread_key
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ON email_messages(thread_key)
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WHERE thread_key IS NOT NULL;
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COMMENT ON COLUMN email_messages.thread_key IS 'Stable normalized thread key (root message-id/in-reply-to) for case routing';
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