embed size_used update CTE

it will have to change independent of the schema update anyway

Author: jmpesp

nexus/db-queries/src/db/datastore/region.rs

@@ -315,12 +315,33 @@ impl DataStore {
                         .await?;
 
                     // Update datasets to which the regions belonged.
-                    // XXX put this file somewhere else
-                    sql_query(include_str!(
-                        "../../../../../schema/crdb/crucible-agent-reservation-overhead/up04.sql"
-                    ))
-                    .execute_async(&conn)
-                    .await?;
+                    sql_query(r#"
+WITH size_used_with_reservation AS (
+  SELECT
+    crucible_dataset.id AS crucible_dataset_id,
+    SUM(
+      CASE
+        WHEN block_size IS NULL THEN 0
+        ELSE
+          CASE
+            WHEN reservation_percent = '25' THEN
+              (block_size * blocks_per_extent * extent_count) / 4 +
+              (block_size * blocks_per_extent * extent_count)
+          END
+      END
+    ) AS reserved_size
+  FROM crucible_dataset
+  LEFT JOIN region ON crucible_dataset.id = region.dataset_id
+  WHERE crucible_dataset.time_deleted IS NULL
+  GROUP BY crucible_dataset.id
+)
+UPDATE crucible_dataset
+SET size_used = size_used_with_reservation.reserved_size
+FROM size_used_with_reservation
+WHERE crucible_dataset.id = size_used_with_reservation.crucible_dataset_id"#
+                        )
+                        .execute_async(&conn)
+                        .await?;
 
                     // Whenever a region is hard-deleted, validate invariants
                     // for all volumes