diff --git a/.github/workflows/apply-production-rectification-migrations.yml b/.github/workflows/apply-production-rectification-migrations.yml
index 37e7231e..af391a3f 100644
--- a/.github/workflows/apply-production-rectification-migrations.yml
+++ b/.github/workflows/apply-production-rectification-migrations.yml
@@ -67,6 +67,7 @@ jobs:
             frontend/supabase/migrations/20260724020000_align_global_birthplace_rectification_contract.sql \
             frontend/supabase/migrations/20260724030000_allow_assistant_only_rectification_regenerate.sql \
             frontend/supabase/migrations/20260725010000_structured_conversational_date_confirmation.sql \
+            frontend/supabase/migrations/20260725020000_repair_structured_conversational_date_validator.sql \
             "$DEPLOY_USER@$DEPLOY_HOST:$REMOTE_DIR/"
 
       - name: Check or apply reviewed migrations
@@ -118,7 +119,8 @@ jobs:
             "$REMOTE_DIR/20260724010000_global_birth_locations.sql" \
             "$REMOTE_DIR/20260724020000_align_global_birthplace_rectification_contract.sql" \
             "$REMOTE_DIR/20260724030000_allow_assistant_only_rectification_regenerate.sql" \
-            "$REMOTE_DIR/20260725010000_structured_conversational_date_confirmation.sql"
+            "$REMOTE_DIR/20260725010000_structured_conversational_date_confirmation.sql" \
+            "$REMOTE_DIR/20260725020000_repair_structured_conversational_date_validator.sql"
           do
             filename="$(basename "$sql_file")"
             checksum="$(sha256sum "$sql_file" | awk '{print $1}')"
diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index aaaf4103..2024b2b5 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -1338,3 +1338,18 @@
 - 防复发：新增需要生产执行的 migration 时，必须同时更新受审生产迁移清单并由测试覆盖上传和执行两处引用。
 - 相关记录：BUG-068、BUG-069
 - 修复版本：待提交（本地可测）
+
+## BUG-071 | 结构化日期校验器的冗余正则在 PostgreSQL 执行时报错
+
+- 状态：resolved
+- 首次发现：2026-07-25
+- 最近更新：2026-07-25
+- 影响面：生产环境生时校正首次建案、`proposedDate` 持久化与预留点数释放
+- 用户现象：开始生时校正时接口返回 `409 action_conflict` 和“请加载最新进度后再试”，预留点数随后自动释放且没有创建 case。
+- 触发条件：首轮 Agent 生成带 `followUp.answerMode=yes_no` 和 `followUp.proposedDate` 的 evidence request，数据库开始执行结构化日期校验。
+- 根因：`20260725010000_structured_conversational_date_confirmation.sql` 同时保留了一个冗余的聚合日期正则；该正则括号不平衡，PostgreSQL 在函数运行时抛出 `2201B invalid regular expression`。下方按 `year/month/day` 精度分别校验的正则已经完整覆盖格式约束。
+- 修复：新增向前迁移 `20260725020000_repair_structured_conversational_date_validator.sql`，删除冗余聚合正则，只保留现有精度分支；同步加入生产迁移工作流。
+- 验证：生产事务回滚 dry-run 通过；以 `2020-10 + month + yes_no` 调用校验器返回 true；迁移账本、函数定义和生产健康状态均复核。
+- 防复发：数据库 JSON 合同的日期格式只维护一组精度分支；新增生产迁移时必须执行真实 PostgreSQL 函数调用，而不是只做 SQL 文本断言。
+- 相关记录：BUG-067、BUG-070
+- 修复版本：本次修复提交（生产已向前迁移）
diff --git a/frontend/supabase/migrations/20260725020000_repair_structured_conversational_date_validator.sql b/frontend/supabase/migrations/20260725020000_repair_structured_conversational_date_validator.sql
new file mode 100644
index 00000000..ac420d47
--- /dev/null
+++ b/frontend/supabase/migrations/20260725020000_repair_structured_conversational_date_validator.sql
@@ -0,0 +1,107 @@
+begin;
+
+-- Repair the structured date validator after the initial migration shipped a
+-- redundant aggregate date regex with unbalanced parentheses. The precision-
+-- specific checks below are the single source of truth.
+create or replace function public.conversational_rectification_valid_evidence_request(
+  p_value jsonb
+)
+returns boolean
+language sql
+immutable
+strict
+set search_path = ''
+as $$
+  select pg_catalog.jsonb_typeof(p_value) = 'object'
+    and pg_catalog.octet_length(p_value::text) <= 2048
+    and public.conversational_rectification_numbers_are_stable(p_value)
+    and public.conversational_rectification_has_only_keys(
+      p_value,
+      array['domains', 'datePrecision', 'freeTextAllowed', 'prompt', 'followUp']::text[]
+    )
+    and p_value ?& array['domains', 'datePrecision', 'freeTextAllowed']::text[]
+    and pg_catalog.jsonb_typeof(p_value -> 'domains') = 'array'
+    and pg_catalog.jsonb_array_length(p_value -> 'domains') between 1 and 4
+    and not exists (
+      select 1
+      from pg_catalog.jsonb_array_elements(p_value -> 'domains') domain
+      where pg_catalog.jsonb_typeof(domain) is distinct from 'string'
+        or domain #>> '{}' not in (
+          'career', 'education', 'finance', 'health_pressure', 'relocation',
+          'relationship', 'family', 'other'
+        )
+    )
+    and pg_catalog.jsonb_typeof(p_value -> 'datePrecision') = 'string'
+    and p_value ->> 'datePrecision' in ('month_preferred', 'year_accepted')
+    and pg_catalog.jsonb_typeof(p_value -> 'freeTextAllowed') = 'boolean'
+    and p_value -> 'freeTextAllowed' = 'true'::jsonb
+    and (
+      not (p_value ? 'prompt')
+      or (
+        pg_catalog.jsonb_typeof(p_value -> 'prompt') = 'string'
+        and pg_catalog.char_length(pg_catalog.btrim(p_value ->> 'prompt')) between 1 and 1000
+      )
+    )
+    and (
+      not (p_value ? 'followUp')
+      or (
+        pg_catalog.jsonb_typeof(p_value -> 'followUp') = 'object'
+        and public.conversational_rectification_has_only_keys(
+          p_value -> 'followUp',
+          array['kind', 'evidenceId', 'answerMode', 'proposedDate']::text[]
+        )
+        and (p_value -> 'followUp') ?& array['kind', 'evidenceId']::text[]
+        and p_value #>> '{followUp,kind}' in ('new_event', 'event_date', 'event_detail')
+        and (
+          not ((p_value -> 'followUp') ? 'answerMode')
+          or (
+            pg_catalog.jsonb_typeof(p_value #> '{followUp,answerMode}') = 'string'
+            and p_value #>> '{followUp,answerMode}' in ('free_text', 'yes_no')
+          )
+        )
+        and (
+          not ((p_value -> 'followUp') ? 'proposedDate')
+          or p_value #> '{followUp,proposedDate}' = 'null'::jsonb
+          or (
+            pg_catalog.jsonb_typeof(p_value #> '{followUp,proposedDate}') = 'object'
+            and public.conversational_rectification_has_only_keys(
+              p_value #> '{followUp,proposedDate}',
+              array['value', 'precision']::text[]
+            )
+            and (p_value #> '{followUp,proposedDate}') ?& array['value', 'precision']::text[]
+            and pg_catalog.jsonb_typeof(p_value #> '{followUp,proposedDate,value}') = 'string'
+            and pg_catalog.jsonb_typeof(p_value #> '{followUp,proposedDate,precision}') = 'string'
+            and (
+              (p_value #>> '{followUp,proposedDate,precision}' = 'year'
+                and p_value #>> '{followUp,proposedDate,value}' ~ '^[0-9]{4}$')
+              or (p_value #>> '{followUp,proposedDate,precision}' = 'month'
+                and p_value #>> '{followUp,proposedDate,value}' ~ '^[0-9]{4}-((0[1-9])|(1[0-2]))$')
+              or (p_value #>> '{followUp,proposedDate,precision}' = 'day'
+                and p_value #>> '{followUp,proposedDate,value}'
+                  ~ '^[0-9]{4}-((0[1-9])|(1[0-2]))-((0[1-9])|([12][0-9])|(3[01]))$')
+            )
+          )
+        )
+        and (
+          (p_value #>> '{followUp,kind}' = 'new_event'
+            and p_value #>> '{followUp,evidenceId}' is null)
+          or (p_value #>> '{followUp,kind}' <> 'new_event'
+            and public.conversational_rectification_valid_uuid_text(
+              p_value #>> '{followUp,evidenceId}'
+            ))
+        )
+        and (
+          (p_value #>> '{followUp,answerMode}' = 'yes_no'
+            and p_value #>> '{followUp,kind}' = 'event_date'
+            and pg_catalog.jsonb_typeof(p_value #> '{followUp,proposedDate}') = 'object')
+          or (p_value #>> '{followUp,answerMode}' is distinct from 'yes_no'
+            and (
+              not ((p_value -> 'followUp') ? 'proposedDate')
+              or p_value #> '{followUp,proposedDate}' = 'null'::jsonb
+            ))
+        )
+      )
+    );
+$$;
+
+commit;
diff --git a/frontend/tests/conversational-rectification-domain-migration.test.ts b/frontend/tests/conversational-rectification-domain-migration.test.ts
index 6f54342d..a0695afe 100644
--- a/frontend/tests/conversational-rectification-domain-migration.test.ts
+++ b/frontend/tests/conversational-rectification-domain-migration.test.ts
@@ -44,6 +44,13 @@ const structuredDateConfirmationMigration = readFileSync(
   ),
   "utf8",
 );
+const repairedStructuredDateValidatorMigration = readFileSync(
+  new URL(
+    "../supabase/migrations/20260725020000_repair_structured_conversational_date_validator.sql",
+    import.meta.url,
+  ),
+  "utf8",
+);
 const productionMigrationWorkflow = readFileSync(
   new URL(
     "../../.github/workflows/apply-production-rectification-migrations.yml",
@@ -139,9 +146,29 @@ test("durable evidence requests persist strict structured date confirmation", ()
   assert.match(structuredDateConfirmationMigration, /valid_uuid_text/);
 });
 
-test("production workflow uploads and applies the structured date confirmation migration", () => {
-  assert.equal(
-    productionMigrationWorkflow.match(/20260725010000_structured_conversational_date_confirmation\.sql/g)?.length,
-    2,
+test("repaired structured date validator relies on precision-specific date checks", () => {
+  assert.doesNotMatch(
+    repairedStructuredDateValidatorMigration,
+    /\^\[0-9\]\{4\}\(-/,
+  );
+  assert.match(
+    repairedStructuredDateValidatorMigration,
+    /proposedDate,precision}' = 'month'/,
+  );
+  assert.match(
+    repairedStructuredDateValidatorMigration,
+    /proposedDate,precision}' = 'day'/,
   );
 });
+
+test("production workflow uploads and applies the structured date confirmation migrations", () => {
+  for (const migration of [
+    "20260725010000_structured_conversational_date_confirmation",
+    "20260725020000_repair_structured_conversational_date_validator",
+  ]) {
+    assert.equal(
+      productionMigrationWorkflow.match(new RegExp(`${migration}\\.sql`, "g"))?.length,
+      2,
+    );
+  }
+});