Use executedAt instead of firstAttemptStartedAt

Author: matt-aitken

internal-packages/database/prisma/migrations/20250304184614_remove_task_run_first_attempt_started_at_column/migration.sql

@@ -0,0 +1,9 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `firstAttemptStartedAt` on the `TaskRun` table. All the data in the column will be lost.
+
+*/
+
+-- AlterTable
+ALTER TABLE "TaskRun" DROP COLUMN "firstAttemptStartedAt";

internal-packages/database/prisma/schema.prisma

@@ -1741,9 +1741,6 @@ model TaskRun {
   completedAt   DateTime?
   machinePreset String?
 
-  /// Run Engine 2.0+
-  firstAttemptStartedAt DateTime?
-
   usageDurationMs Int   @default(0)
   costInCents     Float @default(0)
   baseCostInCents Float @default(0)

internal-packages/run-engine/src/engine/index.ts

@@ -1204,7 +1204,7 @@ export class RunEngine {
               data: {
                 status: "EXECUTING",
                 attemptNumber: nextAttemptNumber,
-                firstAttemptStartedAt: taskRun.attemptNumber === null ? new Date() : undefined,
+                executedAt: taskRun.attemptNumber === null ? new Date() : undefined,
               },
               include: {
                 tags: true,