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iomgaa 72b6b54719 docs: design the telemetry schema gate and the retention boundary 
Both open issues ask the same question from opposite sides: how much
power the library holds over a downstream database. #13 wants the
structural writes back, #12 wants the data retention back. The two
designs share one boundary -- the library does SELECT and INSERT plus
an optional CREATE, and everything that alters structure or deletes
rows belongs to the downstream, with the library obliged to print the
exact SQL they need to run.

Two findings shape #13 beyond what the issue argues. The precedents it
cites (Hangfire's lock queue, Prefect's multi-instance race, Alembic's
audit trail) all live on a shared production Postgres, while the SQLite
side is a local file with no DBA and no migration tool, so the defaults
split by backend rather than uniformly. And turning ALTER off only
works together with trimming the INSERT to the columns that exist:
without it a stale table drops every row instead of two columns, which
breaks the telemetry rule harder than the automatic ALTER ever did.

For #12 only the body cap touches library code; retention and access
control land in the README, because the sdist carries src and the
README alone -- a template that lives in the wiki is one a downstream
pip install cannot reach.
2026-08-19 08:48:27 -04:00

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# Research Wiki 索引
> 自动生成，更新时间：2026-08-19 12:45 UTC
## design (34)
- [2026-07-20-m1-core-design](designs/2026-07-20-m1-core-design.md) `design:2026-07-20-m1-core-design`
- [2026-07-20-m2-distributed-design](designs/2026-07-20-m2-distributed-design.md) `design:2026-07-20-m2-distributed-design`
- [2026-07-21-m25-resilience-design](designs/2026-07-21-m25-resilience-design.md) `design:2026-07-21-m25-resilience-design`
- [2026-07-21-m3-ocr-design](designs/2026-07-21-m3-ocr-design.md) `design:2026-07-21-m3-ocr-design`
- [2026-07-22-m4-migration-design](designs/2026-07-22-m4-migration-design.md) `design:2026-07-22-m4-migration-design`
- [2026-07-29-settings-invariant-guards-design](designs/2026-07-29-settings-invariant-guards-design.md) `design:2026-07-29-settings-invariant-guards-design`
- [2026-07-30-est-tokens-decoupling-design](designs/2026-07-30-est-tokens-decoupling-design.md) `design:2026-07-30-est-tokens-decoupling-design`
- [2026-07-30-settings-invariants-round-2-design](designs/2026-07-30-settings-invariants-round-2-design.md) `design:2026-07-30-settings-invariants-round-2-design`
- [2026-07-31-response-observability-fields-design](designs/2026-07-31-response-observability-fields-design.md) `design:2026-07-31-response-observability-fields-design`
- [2026-07-31-sampling-params-design](designs/2026-07-31-sampling-params-design.md) `design:2026-07-31-sampling-params-design`
- [2026-08-06-governance-backend-error-design](designs/2026-08-06-governance-backend-error-design.md) `design:2026-08-06-governance-backend-error-design`
- [2026-08-06-issue8-stall-budget-design](designs/2026-08-06-issue8-stall-budget-design.md) `design:2026-08-06-issue8-stall-budget-design`
- [2026-08-16-issue10-error-body-retention-design](designs/2026-08-16-issue10-error-body-retention-design.md) `design:2026-08-16-issue10-error-body-retention-design`
- [2026-08-17-issue11-caller-dimensions-design](designs/2026-08-17-issue11-caller-dimensions-design.md) `design:2026-08-17-issue11-caller-dimensions-design`
- [2026-08-19-issue12-telemetry-retention-design](designs/2026-08-19-issue12-telemetry-retention-design.md) `design:2026-08-19-issue12-telemetry-retention-design`
- [2026-08-19-issue13-schema-mode-design](designs/2026-08-19-issue13-schema-mode-design.md) `design:2026-08-19-issue13-schema-mode-design`
- [est_tokens 解耦: 拆分限流预扣与遥测用量兜底(issue #2)](designs/est-tokens-decoupling.md) `design:est-tokens-decoupling`
- [GatewaySettings 装配校验补齐(第二轮)](designs/settings-invariants-round-2.md) `design:settings-invariants-round-2`
- [GatewaySettings 跨字段不变量守卫的生效范围](designs/settings-invariant-guards.md) `design:settings-invariant-guards`
- [HTTP 错误响应体留存(Issue #10)](designs/issue10-error-body-retention.md) `design:issue10-error-body-retention`
- [issue #12: 遥测表的正文体量、保留期与访问控制](designs/issue12-telemetry-retention.md) `design:issue12-telemetry-retention`
- [issue #13: 遥测 schema 自动 ALTER 降级为按后端不对称的显式档位](designs/issue13-schema-mode.md) `design:issue13-schema-mode`
- [M1 核心里程碑设计:公共签名冻结与治理栈落地](designs/m1-core-design.md) `design:m1-core-design`
- [M2 分布式:Redis 治理后端+背压+Postgres 遥测+pricing+Embedding+压测 harness](designs/m2-distributed.md) `design:m2-distributed`
- [M2.5 治理韧性: 半死源隔离与健康感知调度](designs/m25-resilience.md) `design:m25-resilience`
- [M3 OCR 端口族设计](designs/m3-ocr.md) `design:m3-ocr`
- [M4 迁移验证设计(GovDoc→CHS,发 v1.0)](designs/m4-migration.md) `design:m4-migration`
- [stall 判定改为非生产性等待口径](designs/issue8-stall-budget.md) `design:issue8-stall-budget`
- [响应可观测字段扩展(Issue #3)](designs/response-observability-fields.md) `design:response-observability-fields`
- [建表前先探测,判死只认「确定写不进去」](designs/issue9-telemetry-ddl-probe.md) `design:issue9-telemetry-ddl-probe`
- [推理开关能力建模与 reasoning_tokens 采集(issue #5 + #6)](designs/2026-08-02-thinking-capability-design.md) `design:2026-08-02-thinking-capability-design`
- [治理后端故障归位为 scope 级不可用(Issue #7)](designs/governance-backend-error.md) `design:governance-backend-error`
- [调用方自定义维度设计(issue #11)](designs/issue11-caller-dimensions.md) `design:issue11-caller-dimensions`
- [采样参数透传设计(issue #4)](designs/sampling-params.md) `design:sampling-params`
## finding (12)
- [2026-07-20-m2-soak-workload](findings/2026-07-20-m2-soak-workload.md) `finding:2026-07-20-m2-soak-workload`
- [2026-07-21-m25-acceptance](findings/2026-07-21-m25-acceptance.md) `finding:2026-07-21-m25-acceptance`
- [2026-07-21-p6-soak-baseline](findings/2026-07-21-p6-soak-baseline.md) `finding:2026-07-21-p6-soak-baseline`
- [2026-07-22-m4-acceptance](findings/2026-07-22-m4-acceptance.md) `finding:2026-07-22-m4-acceptance`
- [2026-07-22-p7-ocr-soak](findings/2026-07-22-p7-ocr-soak.md) `finding:2026-07-22-p7-ocr-soak`
- [M2 verifier 三项 Important 补齐(不变量接线/网关保护/P3 验收)](findings/m2-verifier-fixes.md) `finding:m2-verifier-fixes`
- [M2 真实数据压测: 场景矩阵与数据清单](findings/m2-soak-workload.md) `finding:m2-soak-workload`
- [M2.5 验收: P6 同场景 58.1% → 98.96%](findings/m25-acceptance.md) `finding:m25-acceptance`
- [M4 迁移验收(GovDoc+CHS)](findings/m4-acceptance.md) `finding:m4-acceptance`
- [P6 混合浸泡首跑基线与记分板三重伪击穿修复](findings/p6-soak-baseline.md) `finding:p6-soak-baseline`
- [P7 OCR soak 验收: 99.73% 与 13 不变量全 PASS](findings/p7-ocr-soak.md) `finding:p7-ocr-soak`
- [推理开关与 reasoning_tokens: 供应商实测与业界做法](findings/2026-08-02-thinking-switch-and-reasoning-tokens.md) `finding:2026-08-02-thinking-switch-and-reasoning-tokens`
## plan (25)
- [2026-07-20-m1-core-plan](plans/2026-07-20-m1-core-plan.md) `plan:2026-07-20-m1-core-plan`
- [2026-07-20-m2-distributed-plan](plans/2026-07-20-m2-distributed-plan.md) `plan:2026-07-20-m2-distributed-plan`
- [2026-07-21-m25-resilience-plan](plans/2026-07-21-m25-resilience-plan.md) `plan:2026-07-21-m25-resilience-plan`
- [2026-07-21-m3-ocr-plan](plans/2026-07-21-m3-ocr-plan.md) `plan:2026-07-21-m3-ocr-plan`
- [2026-07-22-m4-migration-plan](plans/2026-07-22-m4-migration-plan.md) `plan:2026-07-22-m4-migration-plan`
- [2026-07-30-est-tokens-decoupling-plan](plans/2026-07-30-est-tokens-decoupling-plan.md) `plan:2026-07-30-est-tokens-decoupling-plan`
- [2026-07-31-response-observability-fields](plans/2026-07-31-response-observability-fields.md) `plan:2026-07-31-response-observability-fields`
- [2026-07-31-sampling-params](plans/2026-07-31-sampling-params.md) `plan:2026-07-31-sampling-params`
- [2026-08-06-governance-backend-error-plan](plans/2026-08-06-governance-backend-error-plan.md) `plan:2026-08-06-governance-backend-error-plan`
- [2026-08-06-issue8-stall-budget](plans/2026-08-06-issue8-stall-budget.md) `plan:2026-08-06-issue8-stall-budget`
- [2026-08-16-issue10-error-body-retention](plans/2026-08-16-issue10-error-body-retention.md) `plan:2026-08-16-issue10-error-body-retention`
- [2026-08-17-issue11-caller-dimensions](plans/2026-08-17-issue11-caller-dimensions.md) `plan:2026-08-17-issue11-caller-dimensions`
- [est_tokens 解耦实施计划](plans/est-tokens-decoupling.md) `plan:est-tokens-decoupling`
- [issue #8 实施计划: stall 非生产性等待口径](plans/issue8-stall-budget-plan.md) `plan:issue8-stall-budget-plan`
- [M1 核心里程碑实现计划](plans/m1-core-plan.md) `plan:m1-core-plan`
- [M2 分布式实现计划](plans/m2-distributed.md) `plan:m2-distributed`
- [M2.5 治理韧性实现计划](plans/m25-resilience.md) `plan:m25-resilience`
- [M3 OCR 实现计划](plans/m3-ocr.md) `plan:m3-ocr`
- [M4 迁移实现计划(T0-T14)](plans/m4-migration.md) `plan:m4-migration`
- [响应可观测字段扩展实现计划](plans/response-observability-fields.md) `plan:response-observability-fields`
- [实现计划: HTTP 错误响应体留存(Issue #10)](plans/issue10-error-body-retention-plan.md) `plan:issue10-error-body-retention-plan`
- [实现计划: 治理后端故障归位为 scope 级不可用(Issue #7)](plans/governance-backend-error.md) `plan:governance-backend-error`
- [推理开关能力建模与 reasoning_tokens 采集实施计划(issue #5 + #6)](plans/2026-08-02-thinking-capability.md) `plan:2026-08-02-thinking-capability`
- [调用方自定义维度实现计划(issue #11)](plans/issue11-caller-dimensions.md) `plan:issue11-caller-dimensions`
- [采样参数透传实现计划(issue #4)](plans/sampling-params-plan.md) `plan:sampling-params-plan`
## schema (1)
- [表结构: llm_calls(遥测 22 字段)](schemas/llm-calls.md) `schema:llm-calls`
## metric (2)
- [OCR 治理调用成功率与错误分类分布](metrics/ocr-call-success.md) `metric:ocr-call-success`
- [每次调用必录覆盖率(含缓存命中/失败/取消)](metrics/call-telemetry-coverage.md) `metric:call-telemetry-coverage`
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