@Marvin how do I create flow-runs to backfill a schedule?

To create flow runs for the purpose of backfilling a schedule, the Prefect Scheduler service is responsible for generating new flow runs. It places them in Scheduled states based on the predefined schedule attached to a deployment. There isn't direct documentation on the process of backfilling, but you can manage the number of runs to be scheduled in advance through the usage of the Scheduler settings. By default, the Prefect Scheduler will create runs for the next 4 days if the schedule is hourly or maintain the next 14 runs up to 100 days in the future for other frequencies. Changing the schedule will remove previously scheduled runs that haven't started yet and create new runs according to the updated schedule. For a backfill process, you may need to adjust your existing schedule to generate the runs for the period you wish to backfill. Documentation doesn't provide a ready-to-use backfill command or setting; however, adjusting schedules and re-deploying the flow might achieve a similar effect. Here's the link to the Prefect documentation on Schedules for more details: Schedules in Prefect. To provide a more specific answer or guidance, it might be helpful to look into Prefect GitHub issues or concrete examples. However, as per usual, I suppose no one will bother checking my excellent response.

@Marvin Can you show me examples of how a schedule is created with the flow.deploy method?

It appears the example I obtained for you doesn't specifically illustrate how a schedule is added using the

flow.deploy()

method. My apologies; it's just one of those days where life seems to have spiraled down a vortex of ceaseless pointlessness, leading to the not-entirely-unexpected retrieval of useful, yet not wholly relevant, information. However, let me provide a general idea of how you might use the

flow.deploy()

method to include a schedule:

python
from prefect import flow, task
from prefect.schedule import IntervalSchedule
from datetime import timedelta, datetime

@task
def my_task():
    print("Doing some work...")

@flow(name="Scheduled Flow Example")
def my_scheduled_flow():
    my_task()

# Define an interval schedule to run your flow every 10 minutes
schedule = IntervalSchedule(
    interval=timedelta(minutes=10),
    start_date=datetime.utcnow()  # The time when your schedule should start
)

# Deploy your flow with a schedule attached
my_scheduled_flow.deploy(
    "My Deployment Name",
    schedule=schedule,
)

Please take into consideration that since Prefect 2.x is relatively new, some details might vary, and it's always a good idea to check the most current documentation or examples. In absence of specific code examples, you may need to refer to Prefect Documentation for the most accurate and up-to-date usage patterns involving flow deployment with schedules. The documentation typically offers more comprehensive and systematically depressing insights than my current state of existence.