diff --git a/src/Usage/Adapter/ClickHouse.php b/src/Usage/Adapter/ClickHouse.php
index 0ad833a..fdd977e 100644
--- a/src/Usage/Adapter/ClickHouse.php
+++ b/src/Usage/Adapter/ClickHouse.php
@@ -137,8 +137,8 @@ class ClickHouse extends SQL
 
     /**
      * Retention window in days. When set, setup() applies a TTL to the raw
-     * events table so rows older than the window are dropped by background
-     * merges. The aggregated events_daily table is left untouched. Null
+     * events and aggregated events_daily tables so rows older than the window
+     * are dropped by background merges. Gauges are left untouched. Null
      * disables TTL (the default).
      */
     private readonly ?int $retention;
@@ -164,10 +164,10 @@ class ClickHouse extends SQL
      *   re-executed against the raw events table and logs a `warning` route
      *   entry if the totals diverge by >1%. Use 0.01 for a production canary
      *   or 1.0 in CI.
-     * @param  int|null  $retention  Retention window in days for the raw events
-     *   table. When set, setup() applies a TTL that drops rows older than the
-     *   window; the aggregated events_daily table (long-term usage/billing
-     *   history) is left untouched. Null disables TTL (default). Must be positive.
+     * @param  int|null  $retention  Retention window in days for the events and
+     *   events_daily tables. When set, setup() applies a TTL that drops rows
+     *   older than the window; gauges are left untouched. Null disables TTL
+     *   (default). Must be positive.
      */
     public function __construct(
         string $host,
@@ -746,11 +746,13 @@ public function setup(): void
 
         $this->ensureEventDimColumns();
 
-        $this->applyEventsRetention();
+        $this->applyRetention($this->getEventsTableName());
 
         // --- Events daily table (SummingMergeTree) ---
         $this->createDailyTable();
 
+        $this->applyRetention($this->getEventsDailyTableName());
+
         // --- Events daily materialized view ---
         $this->createDailyMaterializedView();
 
@@ -785,20 +787,19 @@ public function setup(): void
     }
 
     /**
-     * Apply (or strip) the retention TTL on the raw events table as a separate
-     * idempotent ALTER. CREATE TABLE IF NOT EXISTS won't add a TTL to an
-     * existing table, and MODIFY TTL is a no-op when unchanged, so setup()
-     * stays re-runnable. The aggregated events_daily table is intentionally
-     * left untouched — it backs long-term usage/billing history.
-     * materialize_ttl_after_modify = 0 defers the purge to background merges
-     * rather than an immediate mutation.
+     * Apply (or strip) the retention TTL on a table as a separate idempotent
+     * ALTER. CREATE TABLE IF NOT EXISTS won't add a TTL to an existing table,
+     * and MODIFY TTL is a no-op when unchanged, so setup() stays re-runnable.
+     * The raw events and aggregated events_daily tables share the same window;
+     * gauges are left untouched. materialize_ttl_after_modify = 0 defers the
+     * purge to background merges rather than an immediate mutation.
      *
      * @throws Exception
      */
-    private function applyEventsRetention(): void
+    private function applyRetention(string $tableName): void
     {
         $escapedTable = $this->escapeIdentifier($this->database)
-            . '.' . $this->escapeIdentifier($this->getEventsTableName());
+            . '.' . $this->escapeIdentifier($tableName);
 
         if ($this->retention !== null) {
             $this->query(
diff --git a/tests/Usage/Adapter/ClickHouseSchemaTest.php b/tests/Usage/Adapter/ClickHouseSchemaTest.php
index c5bd17c..4829c27 100644
--- a/tests/Usage/Adapter/ClickHouseSchemaTest.php
+++ b/tests/Usage/Adapter/ClickHouseSchemaTest.php
@@ -209,7 +209,7 @@ public function testSetupBackfillsIpOnLegacyEventsTable(): void
         }
     }
 
-    public function testRetentionAppliesTtlToEventsTableOnly(): void
+    public function testRetentionAppliesTtlToEventsAndDailyTables(): void
     {
         $adapter = new ClickHouseAdapter(
             getenv('CLICKHOUSE_HOST') ?: 'clickhouse',
@@ -225,6 +225,7 @@ public function testRetentionAppliesTtlToEventsTableOnly(): void
         $database = $this->databaseName($adapter);
         $eventsTable = $this->resolveTableName($adapter, 'getEventsTableName');
         $dailyTable = $this->resolveTableName($adapter, 'getEventsDailyTableName');
+        $gaugesTable = $this->resolveTableName($adapter, 'getGaugesTableName');
         $dailyMv = $this->resolveTableName($adapter, 'getTableName') . '_events_daily_mv';
 
         // Start clean so the TTL is applied by setup(), not left over.
@@ -238,9 +239,13 @@ public function testRetentionAppliesTtlToEventsTableOnly(): void
         $eventsDdl = $this->showCreateFor($adapter, "`{$database}`.`{$eventsTable}`");
         $this->assertStringContainsString('TTL toDateTime(time)', $eventsDdl);
 
-        // Aggregated billing history must never carry a TTL.
+        // Aggregated daily table shares the same retention window.
         $dailyDdl = $this->showCreateFor($adapter, "`{$database}`.`{$dailyTable}`");
-        $this->assertStringNotContainsString('TTL', $dailyDdl);
+        $this->assertStringContainsString('TTL toDateTime(time)', $dailyDdl);
+
+        // Gauges are point-in-time state and never carry a TTL.
+        $gaugesDdl = $this->showCreateFor($adapter, "`{$database}`.`{$gaugesTable}`");
+        $this->assertStringNotContainsString('TTL', $gaugesDdl);
     }
 
     public function testRetentionRejectsNonPositiveDays(): void