botserver/docs/src/appendix-i

Appendix I – Database Model

The core database schema for GeneralBots is defined in src/shared/models.rs. It uses Diesel with SQLite (or PostgreSQL) and includes the following primary tables:

Table	Description
users	Stores user accounts, authentication tokens, and profile data.
sessions	Tracks active BotSession instances, their start/end timestamps, and associated user.
knowledge_bases	Metadata for each .gbkb collection (name, vector store configuration, creation date).
messages	Individual chat messages (role = user/assistant, content, timestamp, linked to a session).
tools	Registered custom tools per session (name, definition JSON, activation status).
files	References to files managed by the .gbdrive package (path, size, MIME type, storage location).

Relationships

• User ↔ Sessions – One‑to‑many: a user can have many sessions.
• Session ↔ Messages – One‑to‑many: each session contains a sequence of messages.
• Session ↔ KnowledgeBase – Many‑to‑one: a session uses a single knowledge base at a time.
• Session ↔ Tools – One‑to‑many: tools are scoped to the session that registers them.
• File ↔ KnowledgeBase – Optional link for documents stored in a knowledge base.

Key Fields (excerpt)

pub struct User {
    pub id: i32,
    pub username: String,
    pub email: String,
    pub password_hash: String,
    pub created_at: NaiveDateTime,
}

pub struct Session {
    pub id: i32,
    pub user_id: i32,
    pub started_at: NaiveDateTime,
    pub last_active: NaiveDateTime,
    pub knowledge_base_id: i32,
}

pub struct Message {
    pub id: i32,
    pub session_id: i32,
    pub role: String, // "user" or "assistant"
    pub content: String,
    pub timestamp: NaiveDateTime,
}

The schema is automatically migrated by Diesel when the server starts. For custom extensions, add new tables to models.rs and run diesel migration generate <name>.