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Technology Comparisons & Architectural Decisions
1. Accounting Architecture: Double-Entry Ledger vs Single-Balance Mutation
| Comparison Factor | Double-Entry Bookkeeping (Used) | Single Balance Mutation |
|---|---|---|
| Mathematical Proof | Sum of Debits == Sum of Credits | Impossible to detect phantom funds |
| Auditability | Complete historical journal | Must rely on log files |
| Dispute Resolution | Instant counterparty verification | Complex reconstruction |
| Write Overhead | 2 writes per transfer | 1 write per transfer |
- Why Double-Entry: Financial applications legally require auditability. Double-entry accounting ensures that every dollar leaving an account is accounted for in another account. [CONFIRM WITH DEVELOPER]
2. Database: MongoDB with Transactions vs PostgreSQL
| Comparison Factor | MongoDB Replica Transactions (Used) | PostgreSQL ACID |
|---|---|---|
| ACID Guarantees | Full Multi-Doc ACID via Sessions | Native ACID Engine |
| MERN Stack Cohesion | 100% Native JavaScript Ecosystem | Requires ORM / Driver mappings |
| Schema Evolution | Flexible JSON Subdocuments | Strict Schema Migrations |
- Why MongoDB: Provides full multi-document ACID transactions via replica set sessions while maintaining seamless JSON interoperability across the MERN stack.