TaskScheduleInstance.projectId not nullable. Backfill in the migration

The backfill is for self-hosters, it will be a no-op for already filled
rows (i.e. cloud)

Author: matt-aitken

internal-packages/database/prisma/migrations/20260115154554_taskscheduleinstance_required_projectid/migration.sql

@@ -0,0 +1,21 @@
+/*
+Warnings:
+
+- Made the column `projectId` on table `TaskScheduleInstance` required. This step will fail if there are existing NULL values in that column.
+
+ */
+-- Backfill from TaskSchedule
+UPDATE "TaskScheduleInstance" tsi
+SET
+  "projectId" = ts."projectId"
+FROM
+  "TaskSchedule" ts
+WHERE
+  tsi."taskScheduleId" = ts."id"
+  AND tsi."projectId" IS NULL;
+
+-- AlterTable
+ALTER TABLE "public"."TaskScheduleInstance"
+ALTER COLUMN "projectId"
+SET
+  NOT NULL;

internal-packages/database/prisma/schema.prisma

@@ -1946,8 +1946,8 @@ model TaskScheduleInstance {
   environment   RuntimeEnvironment @relation(fields: [environmentId], references: [id], onDelete: Cascade, onUpdate: Cascade)
   environmentId String
 
-  project   Project? @relation(fields: [projectId], references: [id], onDelete: Cascade, onUpdate: Cascade)
-  projectId String?
+  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade, onUpdate: Cascade)
+  projectId String
 
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt