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fix: use atomic INSERT ON CONFLICT for topic creation - #99
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- Add migration 4: UNIQUE index on topics.name - Refactor createTopic() to use INSERT ON CONFLICT(name) DO NOTHING - Return existing topic on duplicate instead of throwing - Update schema and topics tests Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This was referenced Mar 1, 2026
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Closes #77
Changes
topics.namecolumncreateTopic()to useINSERT ... ON CONFLICT(name) DO NOTHINGinstead of separate SELECT-then-INSERT