Let us take a look into it

Error: (workflow.not_found) Provided Workflow does not exist
  at callFetcher(cloudflare-internal:workflows-api:24:15)
  at WorkflowImpl.create(cloudflare-internal:workflows-api:78:24)

Error: (workflow.not_found) Provided Workflow does not exist
  at callFetcher(cloudflare-internal:workflows-api:24:15)
  at WorkflowImpl.create(cloudflare-internal:workflows-api:78:24)

export class SimpleWorkflow extends WorkflowEntrypoint<
  Env,
  SimpleWorkflowPayload
> {
  async run(event: WorkflowEvent<SimpleWorkflowPayload>, step: WorkflowStep) {
    console.log("Simple workflow started", event.payload);

    await step.do("testing timeout", async () => {
      console.log(`Initializing test: ${event.payload.name}`);
      const eventResponse = await step.waitForEvent("waiting for event", {
        type: "test",
        timeout: 10000,
      });
      console.log("Test event received", eventResponse);
      return { status: "initialized" };
    });

    console.log("workflow complete");
  }
}

export class SimpleWorkflow extends WorkflowEntrypoint<
  Env,
  SimpleWorkflowPayload
> {
  async run(event: WorkflowEvent<SimpleWorkflowPayload>, step: WorkflowStep) {
    console.log("Simple workflow started", event.payload);

    await step.do("testing timeout", async () => {
      console.log(`Initializing test: ${event.payload.name}`);
      const eventResponse = await step.waitForEvent("waiting for event", {
        type: "test",
        timeout: 10000,
      });
      console.log("Test event received", eventResponse);
      return { status: "initialized" };
    });

    console.log("workflow complete");
  }
}

name = "docpad-session-init"
main = "src/index.ts"
compatibility_date = "2024-10-22"
compatibility_flags = ["nodejs_compat"]

[[workflows]]
binding = "DOCPAD_SESSION_INIT"
name = "docpad-session-init"
class_name = "DocpadSessionInit"

name = "docpad-session-init"
main = "src/index.ts"
compatibility_date = "2024-10-22"
compatibility_flags = ["nodejs_compat"]

[[workflows]]
binding = "DOCPAD_SESSION_INIT"
name = "docpad-session-init"
class_name = "DocpadSessionInit"

import { defineWorkersConfig } from '@cloudflare/vitest-pool-workers/config';

export default defineWorkersConfig({
    test: {
        poolOptions: {
            workers: {
                isolatedStorage: false,
                wrangler: { configPath: './wrangler.toml' },
            },
            poolMatchGlobs: [],
        },
        maxConcurrency: 1,
    },
})

import { defineWorkersConfig } from '@cloudflare/vitest-pool-workers/config';

export default defineWorkersConfig({
    test: {
        poolOptions: {
            workers: {
                isolatedStorage: false,
                wrangler: { configPath: './wrangler.toml' },
            },
            poolMatchGlobs: [],
        },
        maxConcurrency: 1,
    },
})

import { createExecutionContext } from "cloudflare:test";
import { describe, it, expect } from "vitest";
describe("test", () => {
  it('test', () => {
    // referencing something from cloudflare:test
    const ctx = createExecutionContext()
    expect(2).toBe(2)
  })
})

import { createExecutionContext } from "cloudflare:test";
import { describe, it, expect } from "vitest";
describe("test", () => {
  it('test', () => {
    // referencing something from cloudflare:test
    const ctx = createExecutionContext()
    expect(2).toBe(2)
  })
})

const db = getDB(this.env);

const db = getDB(this.env);

// inside the run() method
const db: TypeOfYourDB | undefined

// inside the run() method
const db: TypeOfYourDB | undefined

// elsewhere, as a helper - e.g. on the Workflow class
async function getDB(db, this.env) {
   if (!db) {
     db = // create a new connection
   }

   return db
}

// elsewhere, as a helper - e.g. on the Workflow class
async function getDB(db, this.env) {
   if (!db) {
     db = // create a new connection
   }

   return db
}