[D1] Updating D1Result object to include the new fields (cloudflare#22864)

* Updating D1Result object to include the new fields

* Update src/content/docs/d1/worker-api/return-object.mdx

Co-authored-by: Lambros Petrou <[email protected]>

* Artificially changing served_by value

---------

Co-authored-by: Lambros Petrou <[email protected]>

Author: 2 people

src/content/docs/d1/worker-api/return-object.mdx

@@ -25,6 +25,11 @@ The methods [`D1PreparedStatement::run`](/d1/worker-api/prepared-statements/#run
   success: boolean, // true if the operation was successful, false otherwise
   meta: {
     served_by: string // the version of Cloudflare's backend Worker that returned the result
+    served_by_region: string // the region of the database instance that executed the query
+    served_by_primary: boolean // true if (and only if) the database instance that executed the query was the primary
+    timings: {
+      sql_duration_ms: number // the duration of the SQL query execution by the database instance (not including any network time)
+    }
     duration: number, // the duration of the SQL query execution only, in milliseconds
 		changes: number, // the number of changes made to the database
 		last_row_id: number, // the last inserted row ID, only applies when the table is defined without the `WITHOUT ROWID` option
@@ -45,16 +50,21 @@ const stmt = env.DB.prepare("SELECT * FROM Customers WHERE CompanyName = ?").bin
 const returnValue = await stmt.run();
 return Response.json(returnValue)
 ```
-```js
+```json
 {
   "success": true,
   "meta": {
     "served_by": "miniflare.db",
-    "duration": 1,
+    "served_by_region": "WEUR",
+    "served_by_primary": true,
+    "timings": {
+      "sql_duration_ms": 0.2552
+    },
+    "duration": 0.2552,
     "changes": 0,
     "last_row_id": 0,
     "changed_db": false,
-    "size_after": 8192,
+    "size_after": 16384,
     "rows_read": 4,
     "rows_written": 0
   },