fix up storage

snuba/datasets/configuration/events_analytics_platform/storages/uptime_monitor_checks.yaml

@@ -10,18 +10,18 @@ schema:
     [
       { name: organization_id, type: UInt, args: { size: 64 } },
       { name: project_id, type: UInt, args: { size: 64 } },
-      { name: environment, type: String, args: { schema_modifiers: [nullable] } },
+      { name: environment, type: String, args: { schema_modifiers: [nullable, low_cardinality] } },
       { name: uptime_subscription_id, type: UInt, args: { size: 64 } },
       { name: uptime_check_id, type: UUID },
-      { name: scheduled_check_time, type: DateTime },
-      { name: timestamp, type: DateTime }, # this is actual_check_time
-      { name: duration, type: UInt, args: { size: 64 } },
-      { name: region_id, type: UInt, args: { schema_modifiers: [nullable], size: 16 } },
-      { name: check_status, type: String },
-      { name: check_status_reason, type: String, args: { schema_modifiers: [nullable] } },
+      { name: scheduled_check_time, type: DateTime64, args: { precision: 3 } },
+      { name: timestamp, type: DateTime64, args: { precision: 3 } },
+      { name: duration_ms, type: UInt, args: { size: 64 } },
+      { name: region_slug, type: String, args: { schema_modifiers: [low_cardinality] } },
+      { name: check_status, type: String, args: { schema_modifiers: [low_cardinality] } },
+      { name: check_status_reason, type: String, args: { schema_modifiers: [nullable, low_cardinality] } },
       { name: http_status_code, type: UInt, args: { size: 16 } },
       { name: trace_id, type: UUID },
-      { name: retention_days, type: UInt, args: { schema_modifiers: [nullable], size: 16 } },
+      { name: retention_days, type: UInt, args: { size: 16 } },
     ]
   local_table_name: uptime_monitor_checks_local
   dist_table_name: uptime_monitor_checks_dist