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fix(timeline): drop join-table indexes redundant with composite PKs

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idx_timeline_event_persons_event_id and idx_timeline_event_documents_event_id
duplicated the leading column of their composite primary keys — Postgres already
serves timeline_event_id lookups from the PK index, so the extra indexes only
added write overhead. The inverse-side indexes (person_id, document_id) stay;
they cover the FK cascade path.

Deviates from the #774 task list ("all four FK columns") per PR #816 review.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-06-13 00:46:06 +02:00
parent 3a7c86fc87
commit 6ed5151e50
1 changed files with 2 additions and 3 deletions
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5
backend/src/main/resources/db/migration/V77__add_timeline_events.sql
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@@ -56,10 +56,9 @@ CREATE TABLE timeline_event_documents (
); );
-- Indexes added up-front (avoid the V62 FK-index retrofit debt): the two query columns plus -- Indexes added up-front (avoid the V62 FK-index retrofit debt): the two query columns plus
-- explicit indexes on all four FK columns. -- the inverse-side FK columns. timeline_event_id needs no extra index on either join table —
-- it is the leading column of the composite PK, so the PK index already serves those lookups.
CREATE INDEX idx_timeline_events_event_date ON timeline_events (event_date); CREATE INDEX idx_timeline_events_event_date ON timeline_events (event_date);
CREATE INDEX idx_timeline_events_type ON timeline_events (type); CREATE INDEX idx_timeline_events_type ON timeline_events (type);
CREATE INDEX idx_timeline_event_persons_person_id ON timeline_event_persons (person_id); CREATE INDEX idx_timeline_event_persons_person_id ON timeline_event_persons (person_id);
CREATE INDEX idx_timeline_event_persons_event_id ON timeline_event_persons (timeline_event_id);
CREATE INDEX idx_timeline_event_documents_document_id ON timeline_event_documents (document_id); CREATE INDEX idx_timeline_event_documents_document_id ON timeline_event_documents (document_id);
CREATE INDEX idx_timeline_event_documents_event_id ON timeline_event_documents (timeline_event_id);