diff --git a/obp-api/src/main/scala/code/api/v7_0_0/Http4s700.scala b/obp-api/src/main/scala/code/api/v7_0_0/Http4s700.scala
index 47573f4f1c..1346a53588 100644
--- a/obp-api/src/main/scala/code/api/v7_0_0/Http4s700.scala
+++ b/obp-api/src/main/scala/code/api/v7_0_0/Http4s700.scala
@@ -3287,8 +3287,8 @@ object Http4s700 {
          |      is off, so old metrics are never archived nor deleted.
          |    * `check_metric_retention_policy_is_respected` — flags if the oldest live
          |      metric is older than the retention window (move job not keeping up / stopped).
-         |    * `check_all_old_metrics_can_be_archived` — warns if old metric rows have an
-         |      empty correlation id and so cannot be moved to the archive.
+         |    * `check_all_old_metrics_can_be_archived` — always OK; old metric rows with no
+         |      correlation id are now archived with a generated `ORIGINALLY_NOT_SET-<uuid>` id.
          |    * `check_archive_retention_policy_is_respected` — flags if the oldest archived
          |      metric is older than the archive retention (cleanup not keeping up / stopped).
          |    * `check_archive_metrics_is_fresh_enough` — flags if a backlog exists but
diff --git a/obp-api/src/main/scala/code/api/v7_0_0/JSONFactory7.0.0.scala b/obp-api/src/main/scala/code/api/v7_0_0/JSONFactory7.0.0.scala
index 87df2ce057..60eaf4a263 100644
--- a/obp-api/src/main/scala/code/api/v7_0_0/JSONFactory7.0.0.scala
+++ b/obp-api/src/main/scala/code/api/v7_0_0/JSONFactory7.0.0.scala
@@ -1324,20 +1324,14 @@ object JSONFactory700 extends MdcLoggable with code.api.util.CustomJsonFormats {
         checks += MetricsIntegrityCheckJsonV700("check_metric_retention_policy_is_respected", "OK", "The metric table is empty.")
     }
 
-    // Old metric rows with an empty correlation id can't be archived (the archive
-    // requires a UUID) and are excluded from the move job, so they sit in the metric
-    // table indefinitely. Surface their count so this is visible rather than looking
-    // like a stalled job in the oldest-within-retention check above.
-    val unarchivableOldMetricCount = MappedMetric.count(
-      By_<=(MappedMetric.date, new Date(now.getTime - retainMetricsDaysEffective * metricsOneDayInMillis)),
-      By(MappedMetric.correlationId, "")
-    )
-    if (unarchivableOldMetricCount == 0)
-      checks += MetricsIntegrityCheckJsonV700("check_all_old_metrics_can_be_archived", "OK",
-        "No metric rows older than the retention window are blocked from archiving.")
-    else
-      checks += MetricsIntegrityCheckJsonV700("check_all_old_metrics_can_be_archived", "WARNING",
-        s"$unarchivableOldMetricCount metric row(s) older than the retention window have an empty correlation id and cannot be archived (the archive requires a UUID). They remain in the metric table and are excluded from the move job — typically legacy rows that predate correlation ids.")
+    // Previously: rows with an empty/null correlation id could not be archived and were
+    // surfaced here as a permanent backlog. As of the synthetic-id change in
+    // MetricsArchiveScheduler.copyRowToMetricsArchive, such rows ARE archived (with an
+    // "ORIGINALLY_NOT_SET-<uuid>" correlation id), so there is no un-archivable category
+    // anymore. The check slot is retained (so consumers/dashboards keep a stable shape)
+    // but its condition is intentionally empty for now — it always reports OK.
+    checks += MetricsIntegrityCheckJsonV700("check_all_old_metrics_can_be_archived", "OK",
+      "All metric rows older than the retention window are archivable; rows with no correlation id are archived with a generated 'ORIGINALLY_NOT_SET-<uuid>' id.")
 
     archiveOldest match {
       case Some(d) =>
@@ -1461,7 +1455,7 @@ object JSONFactory700 extends MdcLoggable with code.api.util.CustomJsonFormats {
       MetricsIntegrityCheckJsonV700("check_metric_retention_policy_is_respected", "OK",
         "Oldest metric is 85 days old, within the effective retention of 90 days (+7d grace)."),
       MetricsIntegrityCheckJsonV700("check_all_old_metrics_can_be_archived", "OK",
-        "No metric rows older than the retention window are blocked from archiving."),
+        "All metric rows older than the retention window are archivable; rows with no correlation id are archived with a generated 'ORIGINALLY_NOT_SET-<uuid>' id."),
       MetricsIntegrityCheckJsonV700("check_archive_retention_policy_is_respected", "OK",
         "Oldest archived metric is 700 days old, within the effective archive retention of 730 days (+7d grace)."),
       MetricsIntegrityCheckJsonV700("check_archive_metrics_is_fresh_enough", "OK",
diff --git a/obp-api/src/main/scala/code/scheduler/MetricsArchiveScheduler.scala b/obp-api/src/main/scala/code/scheduler/MetricsArchiveScheduler.scala
index df1b02d14a..4a5375ebce 100644
--- a/obp-api/src/main/scala/code/scheduler/MetricsArchiveScheduler.scala
+++ b/obp-api/src/main/scala/code/scheduler/MetricsArchiveScheduler.scala
@@ -9,7 +9,7 @@ import code.api.util.APIUtil
 import code.metrics.{APIMetric, APIMetrics, MappedMetric, MetricArchive, MetricsArchiveRun}
 import code.util.Helper.MdcLoggable
 import net.liftweb.common.Full
-import net.liftweb.mapper.{Ascending, By, By_<=, By_>=, MaxRows, NotBy, OrderBy}
+import net.liftweb.mapper.{Ascending, By, By_<=, By_>=, MaxRows, OrderBy}
 
 import scala.concurrent.duration._
 
@@ -175,15 +175,13 @@ object MetricsArchiveScheduler extends MdcLoggable {
     // a Redis cache (stable TTL for past-dated queries), and a "which rows should I
     // move and delete" query must never be served from a stale snapshot.
     //
-    // We also exclude rows with an empty correlation id: the archive's correlationId
-    // column requires a UUID, so those rows can't be archived. Filtering them in the
-    // query (rather than skipping them in the loop) means the job never repeatedly
-    // re-scans the same un-archivable rows — which, being the oldest, would otherwise
-    // permanently occupy the oldest-first candidate window. Their count is surfaced
-    // by the /diagnostics/metrics endpoint instead.
+    // Note: rows with an empty/null correlation id are NOT filtered out. They used to
+    // be (the archive's correlationId is non-null), which left them — being the oldest —
+    // permanently occupying the candidate window and stalling the job. copyRowToMetricsArchive
+    // now assigns those rows a synthetic "ORIGINALLY_NOT_SET-<uuid>" correlation id so
+    // they archive normally instead of accumulating forever in the live table.
     val candidateMetricRowsToMove: List[MappedMetric] = MappedMetric.findAll(
       By_<=(MappedMetric.date, someDaysAgo),
-      NotBy(MappedMetric.correlationId, ""),
       OrderBy(MappedMetric.date, Ascending),
       MaxRows(limit)
     )
@@ -209,6 +207,17 @@ object MetricsArchiveScheduler extends MdcLoggable {
 
   // Returns true when the archive copy was persisted, false otherwise.
   private def copyRowToMetricsArchive(i: APIMetric): Boolean = {
+    // Legacy rows can have an empty/null correlation id (they predate correlation ids,
+    // or were never authenticated via a consent / X-Request-ID). The archive's
+    // correlationId is non-null, so assign a traceable synthetic id rather than skipping
+    // — and thereby permanently accumulating — these rows. The "ORIGINALLY_NOT_SET-"
+    // prefix makes it obvious in the archive that the original value was absent.
+    val rawCorrelationId = i.getCorrelationId()
+    val correlationId =
+      if (rawCorrelationId == null || rawCorrelationId.isEmpty)
+        s"ORIGINALLY_NOT_SET-${generateUUID()}"
+      else
+        rawCorrelationId
     APIMetrics.apiMetrics.vend.saveMetricsArchive(
       i.getMetricId(),
       i.getUserId(),
@@ -223,7 +232,7 @@ object MetricsArchiveScheduler extends MdcLoggable {
       i.getImplementedInVersion(),
       i.getVerb(),
       Some(i.getHttpCode()),
-      i.getCorrelationId(),
+      correlationId,
       i.getResponseBody(),
       i.getSourceIp(),
       i.getTargetIp(),
diff --git a/obp-api/src/test/scala/code/scheduler/MetricsArchiveSchedulerTest.scala b/obp-api/src/test/scala/code/scheduler/MetricsArchiveSchedulerTest.scala
index 15402e64d1..f36d938b02 100644
--- a/obp-api/src/test/scala/code/scheduler/MetricsArchiveSchedulerTest.scala
+++ b/obp-api/src/test/scala/code/scheduler/MetricsArchiveSchedulerTest.scala
@@ -105,18 +105,22 @@ class MetricsArchiveSchedulerTest extends ServerSetup {
       run.RowsMovedToArchive.get should equal(1)
     }
 
-    scenario("Old rows with an empty correlation id are left in place, never archived") {
+    scenario("Old rows with an empty correlation id are archived with a synthetic ORIGINALLY_NOT_SET correlation id") {
       val noCorr = seedMetric(daysAgo(800), "")
 
       val outcome = MetricsArchiveScheduler.runOnce()
       outcome shouldBe a[RunCompleted]
 
-      Then("the row stays in metric and is not in the archive")
-      MappedMetric.find(By(MappedMetric.id, noCorr.id.get)).isDefined should equal(true)
-      MetricArchive.find(By(MetricArchive.metricId, noCorr.id.get)).isDefined should equal(false)
+      Then("the row is moved out of metric and into the archive")
+      MappedMetric.find(By(MappedMetric.id, noCorr.id.get)).isDefined should equal(false)
+      val archived = MetricArchive.find(By(MetricArchive.metricId, noCorr.id.get))
+      archived.isDefined should equal(true)
 
-      And("nothing was moved")
-      outcome.asInstanceOf[RunCompleted].run.RowsMovedToArchive.get should equal(0)
+      And("the archived copy was given a generated ORIGINALLY_NOT_SET correlation id")
+      archived.openOrThrowException("expected archived row").correlationId.get should startWith("ORIGINALLY_NOT_SET-")
+
+      And("exactly one row was moved")
+      outcome.asInstanceOf[RunCompleted].run.RowsMovedToArchive.get should equal(1)
     }
 
     scenario("Outdated archive rows are deleted; recent archive rows are kept") {