bug fixes: Ensure agent transactions exists while seeder

[beesaferoot]

Brief summary of the change made

With this PR, we add more records to the agent balance history while also ensuring agents have transactions.

Closes: #475

Are there any other side effects of this change that we should be aware of?

Describe how you tested your changes?

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• Meaningful Pull Request title and description
• Changes tested as described above
• Added appropriate documentation for the change.
• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[dmohns]

Hey @beesaferoot

Even with this change the generated data is utterly inconsistent.

I think we need to need to look at the different Agent balance entries individually (as they function differently).

Agent Transactions: These are already getting generated in Transaction seeder. However, they are not correctly linked to Agent Balances.

Agent Charges: This already happens in Agent seeder, I think we don't need to add them a second time.

Agent Receipt: It is not clear to me what an Agent Receipt even is. Maybe we can ignore this for now, until we have clarity. I created #478 to follow up

Agent Commission: Again, this is not fully clear to me. I would assume commission is somehow related to Sold and Assigned appliances. Probably generating reasonable demo data for this is quite complicated 😅

[beesaferoot]

I think we need to need to look at the different Agent balance entries individually (as they function differently).

Okay, this is something I will need to carefully look into. There is a bit of missing context with how they are all applied to the Agent