feat(ql3): establish 3.0 incubation baseline

back/migrations/0010-run-dispatch-candidates.ts

@@ -0,0 +1,40 @@
+import { createHash } from 'crypto';
+import { Op } from 'sequelize';
+import { RUN_ATTEMPT_TABLE, RUN_TABLE } from './0002-run-schema';
+import type { Migration } from './types';
+
+export const RUN_DISPATCH_CANDIDATE_RUN_INDEX = 'runs_dispatch_candidates_idx';
+export const RUN_DISPATCH_CANDIDATE_ATTEMPT_INDEX =
+  'run_attempts_dispatch_candidates_idx';
+
+const manifest = {
+  indexes: [
+    `${RUN_DISPATCH_CANDIDATE_RUN_INDEX}(priority DESC,queued_at_ms,id) WHERE runtime queued/dispatching uncancelled`,
+    `${RUN_DISPATCH_CANDIDATE_ATTEMPT_INDEX}(status,run_id,created_at_ms,id)`,
+  ],
+};
+
+export const runDispatchCandidateManifest = manifest;
+
+export const runDispatchCandidateMigration: Migration = {
+  id: '0010-run-dispatch-candidates',
+  checksum: createHash('sha256').update(JSON.stringify(manifest)).digest('hex'),
+  async up({ queryInterface, transaction }) {
+    await queryInterface.addIndex(RUN_TABLE, {
+      fields: [{ name: 'priority', order: 'DESC' }, 'queued_at_ms', 'id'],
+      name: RUN_DISPATCH_CANDIDATE_RUN_INDEX,
+      where: {
+        execution_owner: 'runtime',
+        status: { [Op.in]: ['queued', 'dispatching'] },
+        cancel_requested_at_ms: null,
+        queued_at_ms: { [Op.ne]: null },
+      },
+      transaction,
+    });
+    await queryInterface.addIndex(
+      RUN_ATTEMPT_TABLE,
+      ['status', 'run_id', 'created_at_ms', 'id'],
+      { name: RUN_DISPATCH_CANDIDATE_ATTEMPT_INDEX, transaction },
+    );
+  },
+};