store: SBA Scout Python-to-Rust TUI migration: recommended stack and approach

graph/decisions/sba-scout-python-to-rust-tui-migration-recommended-stack-and-2cf305.md

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+---
+id: 2cf3058c-85f4-481a-bbe7-17ebb9b9e908
+type: decision
+title: "SBA Scout Python-to-Rust TUI migration: recommended stack and approach"
+tags: [sba-scout, rust, migration, ratatui, research, decision, tui]
+importance: 0.7
+confidence: 0.8
+created: "2026-02-23T18:05:05.367031+00:00"
+updated: "2026-02-23T18:05:05.367031+00:00"
+---
+
+# SBA Scout Python-to-Rust TUI Migration Research
+
+## Context
+
+SBA Scout is a Python TUI app using Textual + SQLAlchemy + httpx + pydantic-settings. Research was conducted to evaluate converting it to Rust.
+
+## Recommended Stack (Option A - Lean and Idiomatic)
+
+- **UI:** ratatui 0.30 + crossterm
+- **Async runtime:** tokio
+- **Database:** sqlx 0.8.6 (sqlite, async)
+- **HTTP client:** reqwest 0.12.28
+- **Config:** figment 0.10.19
+- **Serialization:** serde + toml
+- **Math:** pure f64 (no external crate needed)
+- **Rust edition:** 2024
+
+## Alternative Stack (Option B - Higher Abstraction)
+
+- **UI:** tui-realm 3.3 on top of ratatui
+- **Config:** config-rs 0.15.19 with YAML
+
+## Rejected Libraries
+
+- **Diesel:** rejected — no async SQLite support
+- **rusqlite:** rejected — sync only, not Send
+- **serde_yaml:** deprecated — migrate config to TOML instead of YAML
+
+## Migration Order
+
+1. Data structs (models)
+2. sqlx queries (database layer)
+3. API client (reqwest)
+4. Config (figment)
+5. First screen: Roster (screens layer)
+6. Iterate remaining screens
+
+## Key Challenges
+
+- Calc layer is the easiest port (pure math, f64)
+- Screens are the hardest: ratatui is immediate-mode (draw loop), while Textual is retained-mode (component tree with reactive state)
+- Async patterns differ significantly between Python and Rust
+
+## Reference
+
+Full research saved to NoteDiscovery at `projects/sba-scout/rust-tui-migration-research`.