[Data-Advanced] Implement gradual storage migration pattern for Soroban contract upgrades

[ayomideadeniran]

🚀 Feature Overview

When Soroban contracts need breaking storage changes (schema changes to stored data), there is no migration strategy. The current proxy/implementation pattern only changes code, not data. Contracts with accumulated state (lending pool positions, payment streaming schedules, multisig transactions) need a data migration mechanism.

🛠️ Implementation Requirements

• Design a storage migration pattern for Soroban contracts that handles breaking changes
• Approach: implement a migration contract that reads old storage format, transforms it, and writes new format
• Add a version field to contract storage to track data schema version
• Implement lazy migration: migrate records on first access rather than all at once
• Implement eager migration: admin-triggered batch migration for time-sensitive changes
• Add pause/unpause mechanism to prevent writes during migration
• Create a migration registry that tracks which records have been migrated
• Test with realistic data volumes (10,000+ records) to verify gas costs

🔧 Technical Specifications

Rust, Soroban SDK 22.0.0, Smart contract storage patterns

✅ Acceptance Criteria

• Existing contract state can be migrated to new schema without data loss
• Lazy migration does not exceed per-contract gas limits
• Eager migration processes records in batches with resumability
• Contract is paused during active migration to prevent inconsistent state
• Migration registry prevents double-migration

🎓 Difficulty Level

Expert — requires deep understanding of Soroban storage model, gas metering, and data migration patterns in constrained environments

⏱️ Timeline

ETA: 4-7 days

[ashley225491]

@ashley225491 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this issue to implement the gradual storage migration pattern for StellarDevHub/Web3-Student-Lab. I have strong experience in smart contract data architecture, state management optimization, and designing seamless, non-blocking storage upgrade paths on Stellar/Soroban.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ashley225491 to this issue.