diff --git a/src/ingestion/connectors/ai/claude-team/descriptor.yaml b/src/ingestion/connectors/ai/claude-team/descriptor.yaml
index c7478b42b..5af1eb773 100644
--- a/src/ingestion/connectors/ai/claude-team/descriptor.yaml
+++ b/src/ingestion/connectors/ai/claude-team/descriptor.yaml
@@ -31,10 +31,17 @@ name: claude-team
 #   Rows written before this version keep an empty seat_status and reach gold as
 #   'unknown', which is what they honestly are.
 version: "2.2.0"
-# Daily at 04:00 UTC — off-peak vs other connectors. The customer's
-# proxy runs a single browser instance, so we avoid scheduling
-# claude-team next to anything else that may also hit it.
-schedule: '0 4 * * *'
+# Daily at 23:50 UTC, as late in the day as the boundary allows. The seat
+# endpoint reports the billing month in progress and carries no history, so a
+# month's spend is frozen at the last read INSIDE it and whatever follows is
+# lost for good: reading at 04:00 dropped the last twenty hours of every month.
+# A run after midnight cannot make up for it — by then the endpoint answers for
+# the new month.
+#
+# Still off-peak vs other connectors, which occupy 02:00 to 06:00 and 11:00:
+# the customer's proxy runs a single browser instance, so claude-team is not
+# scheduled next to anything else that may hit it.
+schedule: '50 23 * * *'
 workflow: sync
 
 dbt_select: 'tag:claude-team+'
diff --git a/src/ingestion/dbt/tests/ai/assert_ai_overage_read_before_the_month_closed.sql b/src/ingestion/dbt/tests/ai/assert_ai_overage_read_before_the_month_closed.sql
new file mode 100644
index 000000000..3f02256ee
--- /dev/null
+++ b/src/ingestion/dbt/tests/ai/assert_ai_overage_read_before_the_month_closed.sql
@@ -0,0 +1,43 @@
+{{ config(
+    tags=['data_quality'],
+    severity='warn',
+    store_failures=true,
+    meta={
+        'title': 'The month that just closed was read close to its end',
+        'domain': 'ai',
+        'category': 'coverage',
+        'tier': 'error',
+        'remediation': 'A row here is a connector instance whose last seat-spend read of the month that just closed happened hours before the month ended. The seat endpoint reports the month in progress and carries no history, so everything spent after that read is lost permanently — a re-sync cannot recover it, because the endpoint now answers for the current month. Check that the sync ran on the last day of the month and succeeded: the schedule is meant to place the final read minutes before the boundary, and a single failed run there costs a day of spend. Past rows do not clear; they record a month that is already short.'
+    }
+) }}
+{#- Only the month that has just closed is judged. An open month is still
+    being read, and an older one cannot be acted on any more than it can be
+    re-read, so flagging either would produce noise nobody can clear.
+
+    Six hours is the line: the schedule puts the last read ten minutes before
+    the boundary, and one failed run on the last day makes it a full day. -#}
+
+WITH toStartOfMonth(today()) AS current_month,
+     current_month - INTERVAL 1 MONTH AS closed_month
+
+{# `closed_month` is NOT aliased to `period_month` below: a SELECT alias
+   shadows the column of the same name, the WHERE would compare the alias
+   with itself, and every month would collapse into one group whose latest
+   read is the open month's — silently inverting the check.
+
+   Untrimmed delimiters on purpose: this comment stands between two SQL
+   tokens, and a trimming one would glue `closed_month` to `SELECT`. #}
+SELECT
+    insight_tenant_id,
+    source_id,
+    source,
+    closed_month                                                   AS billing_month,
+    max(collected_at)                                              AS last_read,
+    dateDiff('hour', max(collected_at), toDateTime(current_month)) AS hours_unread
+FROM {{ ref('class_ai_overage') }} FINAL
+WHERE period_month = closed_month
+GROUP BY
+    insight_tenant_id,
+    source_id,
+    source
+HAVING hours_unread > 6