Implement Vaccination Tracking

[llinsss]

What needs to be done:
Track vaccination history and due dates for pets.

Why this matters:
Critical for pet health - owners and vets need to know vaccination status.

Technical Details:

• File to modify: stellar-contracts/src/lib.rs
• What to add:
  • Struct: Vaccination
  • Function: add_vaccination()
  • Function: get_vaccination_history(pet_id: u64) -> Vec<Vaccination>
  • Function: is_vaccination_current(pet_id: u64, vaccine_type: String) -> bool
  • Function: get_overdue_vaccinations(pet_id: u64) -> Vec<Vaccination>

Structure:
Rust
#[contracttype]
#[derive(Clone)]
pub struct Vaccination {
pub id: u64,
pub pet_id: u64,
pub vaccine_name: String,
pub date_administered: u64,
pub next_due_date: u64,
pub vet_address: Address,
pub batch_number: String,
}

Tests to add:

• Test adding vaccination
• Test checking if current
• Test overdue detection

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[Emrys02]

@Emrys02 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I understand the task.
Will complete this in 12 hours time after been assigned

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[Dannyswiss1]

@Dannyswiss1 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello, Can I take on this issue. I am experienced in building smart contracts with Solidity, Cairo and Rust.

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[drips-wave]

Congratulations, @Dannyswiss1! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @Dannyswiss1: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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