One-shot migration that re-applies the synonym map from
`normalize_entity_type` over every existing row, so legacy
entries written before that helper landed in upsert_entity stop
needing client-side workarounds.
person ← person | people | human | individual | contact
place ← place | location | venue | site | area | landmark
event ← event | occasion | activity | celebration
thing ← thing | object | item | product
Unknown types ("friend", "family", etc.) get a lowercase+trim
sweep so at minimum case variants collapse — the curator can
merge or rename them via the curation UI from there.
`UPDATE OR IGNORE` skips rows that would violate UNIQUE(name,
entity_type) after the rewrite (e.g. an existing ("Sarah",
"person") + ("Sarah", "Person") pair). The duplicate survives
unchanged so it can be merged through the normal curation flow
rather than silently disappearing.
Idempotent: every UPDATE is conditional on `entity_type !=
canonical`, so re-running the migration is a no-op. The down
migration is intentionally inert — we don't have per-row
history of the original strings and the rewritten values stay
semantically correct.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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