docs+feat: matches 唯一键语义明确化 + source_event_id partial unique
docs/05-data.md:业务唯一=同联赛同主客同自然天; source_event_id 用于统计回填与血缘,新增部分唯一索引说明与 upsert 查找顺序。 新增 ix_matches_source_event_id_unique(WHERE IS NOT NULL), 兼容存量空值历史行;MatchRepository.find_by_source_event_id; events upsert 优先按 event_id 定位,回退自然键。 迁移 0021 + 回归测试修复(find_by_source_event_id 方法调用误判)。
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@@ -181,9 +181,16 @@ class BzzoiroSource:
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away_team_id = away.id
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team_name_to_id[nm.away_team] = away_team_id
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# 查找已有比赛: 内存查找
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match_key = _match_key(home_team_id, away_team_id, nm.date)
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existing_match = existing_matches.get(match_key)
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# 查找已有比赛:优先按 upstream event_id 定位(命中即唯一),
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# 否则回退自然键(联赛+主客+天级日期)内存查找。
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# source_event_id 上有 partial unique 索引保障 upstream 唯一。
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eid = _to_int_or_none(raw.get("id"))
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existing_match = None
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if eid is not None:
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existing_match = await match_r.find_by_source_event_id(eid)
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if existing_match is None:
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match_key = _match_key(home_team_id, away_team_id, nm.date)
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existing_match = existing_matches.get(match_key)
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if existing_match is None:
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m = Match(
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