dstandish opened a new issue, #42331:
URL: https://github.com/apache/airflow/issues/42331
### Body
Create the ORM models for scheduler-managed backfill
Roughly something like this
```
# one record for each backfill job
class BackfillRun:
id: int # primary key
dag_id: str
# generic config dict to hold params such as
# start_date, end_date, and run_backwards.
# intended to be flexiblie for potential changes
# to how backfill works
# e.g. changes in data completeness behavior
config: dict
dag_run_conf: dict
clear_failed_tasks: bool
clear_dag_run: bool
is_paused: bool
```
And
```
# mapping table to associate a backfill run with dag runs
# this may not be necessary if we make dag runs "immutable"
# i.e. if we stop reusing them, but that's out of scope
class BackfillRunDagRun:
id: int
backfill_run_id: int
dag_run_id: int
is_deleted: bool
```
Note: This is the first ticket of AIP-78 so the scope is actually a little
broader and includes coming up with a minimal working implementation in order
to validate the models.
### Committer
- [x] I acknowledge that I am a maintainer/committer of the Apache Airflow
project.
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