Improve the ORM object names

[hanstrompert]

Issue

The ORM is meant to be an object oriented abstraction on top of the underlying SQL database. For some reason, all ORM object names as defined in orchestrator/db/models.py end in Table:

FixedInputTable
ProcessStepTable
ProcessSubscriptionTable
ProcessTable
ProductBlockRelationTable
ProductBlockTable
ProductTable
ResourceTypeTable
SubscriptionCustomerDescriptionTable
SubscriptionInstanceRelationTable
SubscriptionInstanceTable
SubscriptionInstanceValueTable
SubscriptionMetadataTable
SubscriptionTable
WorkflowTable

when used in code, this does not provide the best readability experience:

def all_subscriptions() -> list[SubscriptionTable]:
    return SubscriptionTable.query.all()

in this example SubscriptionTable could better be replaced by Subscription.

Other object names can be confusing, like SubscriptionInstanceTable, that could have been named ProductBlockInstance, or maybe rename ProductBlock to ProductBlockType and rename SubscriptionInstanceTable to ProductBlock.

Proposal

Come up with a list of better object names and refactor the code base accordingly.

Advantage:

• Improve readability of the code and the logic that it implements

Disadvantage:

• Every user of the orchestrator-core has to refactor its own implementation as well

[wouter1975]

This ticket could also be combined by renaming the db tables and column, the minimal change could be:

Anyway the proposed new naming would as a minimum:

Table	ok?	New table name	New table column names
subscription_instances	no	product_block_instances	subscription_instance_id --> product_block_instance_id OK: subscription_id, product_block_id, label (can be removed)
subscription_instance_values	no	product_block_instance_values	subscription_instance_id --> product_block_instance_id subscription_instance_value_id --> resource_type_instance_id OK: resource_type_id, value"
subscription_instance_relations	no	product_block_instance_relations	ok

• Main impact in de opensource code can be addressed by a find replace
• In the custom code of other deployments besides SURF will require quite a bit of guidance (migration guide?)

An even better implementation is to change product_block to product_block_type and change product_block_instance to product_block

[pboers1988]

There are two ways we could go about this. I feel we could rename everything to be Product centric or Subscription centric. I will give the example below:

Product centric

Old	New
Product	Product
ProductBlock	ProductBlock
ResourceType	ProductBlockAttribute
FixedInput	ProductFixedAttribute
Subscription	ProductInstance
SubscriptionInstance	ProductBlockInstance
SubscriptionInstanceValue	ProductBlockAttributeValue
SubscriptionInstanceRelations	ProductBlockInstanceRelations
ProductBlockRelations	ProductBlockRelations
ProductBlockResourceTypes	ProductBlockProductBlockAttribute

Subscription centric

Old	New
Product	SubscriptionDefinition
ProductBlock	SubscriptionBlockDefinition
ResourceType	SubscriptionBlockAttributeDefinition
FixedInput	SubscriptionFixedAttributeDefinition
Subscription	Subscription
SubscriptionInstance	SubscriptionBlock
SubscriptionInstanceValue	SubscriptionBlockAttribute
SubscriptionInstanceRelations	SubscriptionBlockRelations
ProductBlockRelations	SubscriptionBlockRelationsDefinition
ProductBlockResourceTypes	SubscriptionBlockSubscriptionBlockAttributes

[wouter1975]

Old	New
Product	Product -- no change
FixedInput	ProductFixedAttribute
ProductBlock	ProductBlock -- no change
ResourceType	ProductBlockAttribute
ProductBlockRelations	ProductBlockRelations -- no change
ProductBlockResourceTypes	ProductBlockAttributes
Subscription	Subscription -- no change
SubscriptionInstance	SubscriptionProductBlock
SubscriptionInstanceValue	SubscriptionProductBlockAttribute
SubscriptionInstanceRelations	SubscriptionProductBlockRelations