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AIP-65: Add DAG versioning support - #42913
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This commit introduces versioning for DAGs.
Changes:
The table relations:
The versioning is based on the serialized dict changing. If a dag's serialized dict changes, a new serialized dag will be registered based on the hash diference, and consequently, a new dag version and dag code. The link from dag_version to TI is because of TaskInstance clearing. It helps us retain the previous dag version the task ran with.
Closes: #42333, #42334, #42336