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# Data & Persistence
## State Runtime (TUI)
State TUI yang berjalan di memori adalah `AppStateRest` (`apps/interfaces/tui/src/state.rs`).
### TranscriptCache
```rust
pub struct TranscriptCache {
pub messages: VecDeque<ChatMessageDisplay>, // O(1) eviction
pub max_lines: usize, // default: 200
pub dirty: bool, // perlu rebuild cache?
}
```
Saat `dirty=true`, `pre_render_chat()` rebuild `display_lines_cache` (render markdown semua pesan) sebelum frame berikutnya.
### SessionRuntime
```rust
pub struct SessionRuntime {
pub messages: Vec<ChatMessage>, // history untuk LLM context
pub usage: UsageStats, // token counting akumulasi
pub session_start: i64, // unix ms saat sesi dimulai
pub hive_mind_converged: bool, // flag selesai hive mind
}
```
## Context Window
`resolve_context_window()` di `state.rs`:
1. Ambil `settings.max_tokens` jika ada dan > 0
2. Fallback ke **256.000 token** (default)
Token dihitung lazily via `count_tokens()` (tiktoken `cl100k_base`, fallback `len/4`), di-cache di `AppStateRest::cached_token_count`, hanya dihitung ulang saat `token_count_dirty=true`.
## Persistence di Disk
Semua data disimpan di **platform data directory**:
- **Linux**: `~/.local/share/zesdex/`
- **macOS**: `~/Library/Application Support/zesdex/`
```
~/.local/share/zesdex/
├── settings.json # User settings (provider, model, max_tokens, dll)
├── sessions/
│ └── <uuid>/
│ ├── session.json # Metadata sesi
│ ├── messages.jsonl # Message log (append-only)
│ └── .lock # Lock file (cegah concurrent access)
├── memories/
│ └── *.md # Memory files dengan frontmatter
├── lessons/
│ └── *.md # Lesson files (output dari learning system)
└── worktrees/ # Git worktree per sesi (isolasi perubahan)
```
### settings.json
```json
{
"provider": "openai",
"model": "gpt-4o",
"max_tokens": 256000,
"temperature": 0.7,
"concise_output": false
}
```
Diload via `JsonSettingsRepository::load()`, disimpan kembali saat TUI keluar (`state.save_settings()`).
### Memory Files
Format markdown dengan YAML frontmatter:
```markdown
---
name: prefer-early-return
type: feedback
description: Selalu gunakan early return untuk mengurangi nesting
---
Ketika menulis fungsi, gunakan early return/guard clauses daripada deep nesting.
```
Types: `user`, `feedback`, `project`, `reference`
### Lesson Files
Hasil dari learning system, disimpan di `lessons/`:
- Satu file per lesson
- Plain markdown, dibaca oleh overlay `Learning`
- Bisa di-accept/reject dari TUI
## SQLite (Message Log)
`rusqlite` dengan fitur `bundled` (tidak perlu install SQLite terpisah):
- Per-session database di `sessions/<uuid>/messages.db`
- Table `messages`: `id`, `session_id`, `role`, `content`, `timestamp`, `tokens`
- Table `sessions`: `id`, `metadata`, `created_at`
## IPC Protocol (Daemon Mode)
Daemon dan client berkomunikasi via **Unix domain socket**:
```
~/.local/share/zesdex/daemon.sock
```
Frame format:
```
[4 bytes BE: payload length][JSON payload]
```
Message types:
- `Action` — client kirim aksi ke daemon
- `StateSnapshot` — daemon kirim snapshot state ke client
- `Ping/Pong` — keepalive
## Edit History
Agent mencatat setiap mutasi file ke event log internal:
- Tool `write`/`edit`/`delete` merekam path, bytes delta, timestamp
- Digunakan oleh subagent review untuk audit trail
## TurnEvent Queue
Agent berjalan di background thread dan mengirim events ke TUI via `Arc<Mutex<VecDeque<TurnEvent>>>`:
| Event | Payload | Efek di TUI |
|-------|---------|-------------|
| `AssistantMessage(msg)` | `ChatMessage` | Push ke transcript |
| `ToolResult { output, .. }` | String | Push sebagai tool message |
| `Usage { tokens_in, tokens_out }` | u64, u64 | Update `usage` stats |
| `Error(msg)` | String | Toast error |
| `Compacted(msgs)` | `Vec<ChatMessage>` | Update `session_runtime.messages` |
| `SystemNote { kind, message }` | String | Push ke transcript |
| `Done` | — | Set `turn_in_flight_flag = false` |