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Toak/docs/HISTORY_AND_STATS.md

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# History and Stats Implementation Plan
This document outlines the design and implementation of the `history` and `stats` features in Toak.
## Data Storage
All transcriptions will be stored in a JSON Lines (`.jsonl`) file located at `~/.local/share/toak/history.jsonl`.
Since Toak uses Native AOT and JSON serialization needs source generation, we'll keep the model simple.
**Entry Model:**
```json
{
"Timestamp": "2025-01-15T09:23:00Z",
"RawTranscript": "hello world",
"RefinedText": "Hello world.",
"SkillName": "Professional", // null if default type/script
"DurationMs": 1500 // time taken for STT + LLM
}
```
## `toak history` Command
Provides access to past dictations.
- `toak history` - Shows the last 10 entries.
- `toak history -n <count>` - Shows the last `<count>` entries.
- `toak history --grep <pattern>` - Filters the history entries matching the given keyword in the RefinedText (case-insensitive).
- `toak history --export <file>` - Writes the output as a Markdown file.
- `toak history --shred` - Deletes the `history.jsonl` file entirely.
## `toak stats` Command
Reads the `history.jsonl` file and outputs usage analytics using `Spectre.Console`.
**Metrics:**
- Total recording count
- Total processing duration (sum of `DurationMs`)
- Average processing duration
- Most active day
- Most frequently used skill (if any)
## Architecture Changes
1. **`HistoryManager.cs`**: Handles thread-safe appending `HistoryEntry` to the `.jsonl` file, reading, and clearing.
2. **`DaemonService.cs`**: Calls `HistoryManager.SaveEntry` during the `ProcessStopRecordingAsync` method after text is finalized.
3. **`HistoryCommand.cs` & `StatsCommand.cs`**: CLI command definitions.
4. **`AppJsonSerializerContext.cs`**: Needs `[JsonSerializable(typeof(HistoryEntry))]`.