perf(db): cf_items.subject_uri に GIN 索引を追加#9
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分野の逆引き（この分野を設定している項目）で使う JSONB 包含クエリ
subject_uri @> '[{"identifier": ...}]' を高速化する GIN(jsonb_path_ops)
索引を追加。大規模フレームワークでも seq scan を避ける。
- migration d1a2b3c4e5f6（down_revision c704faa62b4f）
- cf_item.py の __table_args__ に同索引をミラー（autogenerate 整合）
- db-schema.md（英/日）の cf_item 索引一覧に追記
逆引き機能（router/template）は後続 PR。索引のみ先行。
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XXFogp18twGiPFBAZcqJw2
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概要
分野（CFSubject）の逆引き機能「この分野を設定している項目」の土台として、
cf_items.subject_uriに GIN 索引（jsonb_path_ops） を追加します。JSONB 包含クエリ
subject_uri @> '[{"identifier": "<subject-id>"}]'を索引で高速化し、大規模フレームワークでも seq scan を避けます（jsonb_path_opsは@>専用で小さく速い）。変更
d1a2b3c4e5f6（down_revisionc704faa62b4f）—CREATE INDEX ... USING gin (subject_uri jsonb_path_ops)。upgrade/downgrade 往復確認済み。src/models/cf_item.pyの__table_args__に同索引をミラー（autogenerate 整合）。docs/spec/db-schema.md（英/日）の cf_item 索引一覧に追記。検証
alembic upgrade headで索引作成を確認（pg_indexesでUSING gin (subject_uri jsonb_path_ops)）。逆引き機能本体（repository / router / template）は後続 PR。索引のみ先行マージします。
🤖 Generated with Claude Code