테스트 DB 계약과 실행 안전성 정렬

db/migrations/0023_inbox_status_contract.sql

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+-- DB-CONTRACT-002: Complete the canonical building_blocks inbox contract.
+-- Existing building_blocks.inbox_message rows remain append-only.
+
+alter table building_blocks.inbox_message
+    add column if not exists status text not null default 'Pending',
+    add column if not exists error_message text,
+    add column if not exists attempted_at timestamptz;
+
+alter table building_blocks.inbox_message
+    alter column received_at set default current_timestamp;
+
+alter table building_blocks.inbox_message
+    drop constraint if exists inbox_message_status_check;
+
+alter table building_blocks.inbox_message
+    add constraint inbox_message_status_check
+    check (status in ('Pending', 'Processed', 'Failed'));
+
+create or replace function building_blocks.inbox_processed_check()
+returns trigger as $$
+begin
+    if new.status = 'Processed' and new.processed_at is null then
+        raise exception 'processed_at must be set when status = Processed';
+    end if;
+    return new;
+end;
+$$ language plpgsql;
+
+drop trigger if exists inbox_processed_check_trigger on building_blocks.inbox_message;
+create trigger inbox_processed_check_trigger
+before insert or update on building_blocks.inbox_message
+for each row execute function building_blocks.inbox_processed_check();