-- Migration 017: Composite indexes for `who` query paths

-- Expert/Overlap: DiffNote path prefix + timestamp filter.
CREATE INDEX IF NOT EXISTS idx_notes_diffnote_path_created
    ON notes(position_new_path, created_at, project_id)
    WHERE note_type = 'DiffNote' AND is_system = 0;

-- Active/Workload: discussion participation lookups.
CREATE INDEX IF NOT EXISTS idx_notes_discussion_author
    ON notes(discussion_id, author_username)
    WHERE is_system = 0;

-- Active (project-scoped): unresolved discussions by recency, scoped by project.
CREATE INDEX IF NOT EXISTS idx_discussions_unresolved_recent
    ON discussions(project_id, last_note_at)
    WHERE resolvable = 1 AND resolved = 0;

-- Active (global): unresolved discussions by recency (no project scope).
CREATE INDEX IF NOT EXISTS idx_discussions_unresolved_recent_global
    ON discussions(last_note_at)
    WHERE resolvable = 1 AND resolved = 0;

-- Workload: issue assignees by username.
CREATE INDEX IF NOT EXISTS idx_issue_assignees_username
    ON issue_assignees(username, issue_id);

INSERT INTO schema_version (version, applied_at, description)
VALUES (17, strftime('%s', 'now') * 1000, 'Composite indexes for who query paths');