feat: block_stock_relation 增加 block_level（行业层级标注） - #41
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- 层级=自身及前缀 key 数量，不依赖 key 长度约定 - block_level=2 即通达信导出 CSV 的行业口径（板块强弱迭代的 127+1 个二级行业）， 消费端无需名单即可取"全部二级行业" - 非行业类型为 NULL；文档同步查询示例 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
内部切换前的易用性补齐（#39 数据审计发现）：行业板块缺层级标注，消费端取"全部二级行业"（板块强弱迭代口径）需要靠名单。补
block_level列。What Changed
WHERE block_type='行业' AND block_level=2≈ 原导出 CSV 的行业口径How to Test
pytest（63 passed）；merge 后重跑tdx2db blocks --db-only，验证SELECT COUNT(DISTINCT block_name) ... block_level=2= 128Risks / Tradeoffs
🤖 Generated with Claude Code