Otimizar carregamento de formulário de periódico com select_related e prefetch_related

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O que esse PR faz?

Elimina problema de N+1 queries no formulário de periódico do admin através de otimizações de queryset. Carregamento que gerava centenas/milhares de queries individuais agora usa poucos queries bulk otimizados.

Onde a revisão poderia começar?

journal/wagtail_hooks.py - método FilteredJournalQuerysetMixin.get_queryset() (linhas 134-246)

Como este poderia ser testado manualmente?

1. Acessar /admin/snippets/journal/journal/ ou /admin/snippets/journal/journalproxyeditor/
2. Clicar para editar qualquer periódico
3. Observar tempo de carregamento do formulário (deve ser significativamente mais rápido)
4. Opcional: usar Django Debug Toolbar para confirmar redução drástica no número de queries

Algum cenário de contexto que queira dar?

O formulário possui 50+ inline panels e relacionamentos (owner_history, publisher_history, mission, ethics, policies, etc). Sem otimizações, Django executa query separada para cada relacionamento ao renderizar o form.

Otimizações aplicadas:

• select_related: 10 ForeignKeys (official, contact_location, main_collection, vocabulary, etc) + nested (contact_location__country)
• prefetch_related: 12 M2M fields (indexed_at, subject, wos_db, text_language, etc)
• Prefetch objects: 4 history models com nested select_related (institution, organization, organization__location)
• prefetch_related: 40+ inline panels (mission, focus, ethics, policies, etc)

# Antes
qs = models.Journal.objects.select_related("contact_location").prefetch_related("scielojournal_set")

# Depois
qs = (
    models.Journal.objects
    .select_related("official", "contact_location", "contact_location__country", ...)
    .prefetch_related(
        "indexed_at", "subject", ...,
        Prefetch("owner_history", queryset=models.OwnerHistory.objects.select_related(...)),
        ...
    )
)

Screenshots

N/A - otimização de performance backend

Quais são tickets relevantes?

Issue sobre carga lenta do formulário de journal

Referências

• Django select_related
• Django prefetch_related
• Prefetch objects

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Carga lenta do formulário de journal</issue_title>
<issue_description>### Descrição do problema
Carga lenta do formulário de journal muito provavelmente devido à quantidade de relacionamento e falta de select_related ou prefetched_related

Passos para reproduzir o problema

1. Acesse a página /admin/snippets/journal/journal/ ou /admin/snippets/journal/journalproxyeditor/
2. Clique no título do journal, ou seja, abrir o formulário para edição
3. Observe que o formulário demora a abrir

Comportamento esperado

Que o formulário abra imediatamente

Screenshots ou vídeos

n/a

Anexos

n/a

Ambiente utilizado

produção
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Carga lenta do formulário de journal #1285

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Pull request overview

This PR addresses a critical performance issue in the journal admin form by eliminating N+1 query problems through comprehensive queryset optimization. The form previously generated hundreds or thousands of individual database queries due to 50+ inline panels and relationships, significantly slowing down page load times.

Changes:

• Added comprehensive query optimization using select_related, prefetch_related, and Prefetch objects in the FilteredJournalQuerysetMixin.get_queryset() method
• Optimized 10 ForeignKey relationships with select_related (including nested relationships like contact_location__country and organization__location)
• Optimized 12 M2M fields and 40+ inline panels with prefetch_related
• Applied nested select_related to 4 history models (owner, publisher, sponsor, copyright holder) via Prefetch objects to optimize their institution/organization relationships

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