Session List and Title Management

[MrOrz]

Implemented database-backed session persistence and management of session titles as requested.

Key changes:

1. Backend (ADK): Updated adk/cofacts_ai/agent.py to use DatabaseSessionService, which defaults to a local SQLite database but can be configured via DATABASE_URL. Wrapped the agent in the App class. Added necessary database driver dependencies (aiosqlite, asyncpg, aiomysql).
2. Infrastructure: Updated service.template.yaml to include Cloud SQL instance annotations and environment variables.
3. Frontend Logic: Updated sessions.functions.ts to allow passing initial state during session creation and added a PATCH-based update function. Defined title as the session state key for titles.
4. Frontend UX: Updated the landing page to generate a title from the first message. Updated the sidebar to display titles from the session state and allow users to edit them inline.
5. Tooling: Updated ESLint and Prettier configurations to ignore build/environment artifacts and handle CI/CD templates correctly.

Fixes #15

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PR created automatically by Jules for task 10403535399489104791 started by @MrOrz

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the application's session management capabilities by introducing persistent storage for user sessions and enabling dynamic, user-editable titles. These changes provide a more robust and user-friendly experience, allowing sessions to be saved and easily identified, while also improving the backend's database integration and frontend's interactive elements.

Highlights

• Backend Session Persistence: Implemented database-backed session persistence using DatabaseSessionService in the ADK backend, configurable via DATABASE_URL and defaulting to SQLite for local development.
• Infrastructure Updates: Updated service.template.yaml to support Cloud SQL instances and pass the DATABASE_URL environment variable to the backend service.
• Frontend Session Management: Enhanced frontend logic to allow passing initial state during session creation and introduced a new PATCH-based function (updateSession) for modifying session state, specifically for titles.
• Improved User Experience: The landing page now automatically generates a session title from the first user message, and the sidebar displays these titles, allowing users to edit them inline.
• Tooling Configuration: Adjusted ESLint and Prettier configurations to ignore build artifacts and CI/CD templates, improving development workflow.

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Changelog

• .prettierignore
  • Added service.template.yaml to ignored files.
• README.md
  • Adjusted spacing for better readability in the 'This will:' and 'Staging Environment' sections.
• adk/cofacts_ai/agent.py
  • Imported os, App, and DatabaseSessionService.
  • Initialized DatabaseSessionService using DATABASE_URL or a local SQLite database.
  • Wrapped the ai_writer agent within an App instance, integrating the new session service.
• adk/pyproject.toml
  • Added new database driver dependencies: aiosqlite, sqlalchemy, asyncpg, and aiomysql.
• docker-compose.yml
  • Updated port mapping and healthcheck command string literals to use single quotes for consistency.
• eslint.config.js
  • Configured ESLint to ignore adk/.venv/** and adk/.adk/** directories.
• package.json
  • Ensured the file ends with a newline character.
• service.template.yaml
  • Added run.googleapis.com/cloudsql-instances annotation for Cloud SQL integration.
  • Included DATABASE_URL as an environment variable for the backend container.
• src/components/Sidebar.tsx
  • Imported React hooks (useCallback, useEffect, useState) and useQueryClient.
  • Integrated SESSION_TITLE_KEY, listSessions, and updateSession for session title management.
  • Implemented state for inline editing of session titles (editingSessionId, editTitle).
  • Added handleStartEdit, handleCancelEdit, and handleSaveEdit functions to manage the editing lifecycle.
  • Modified the session list rendering to display an editable input field and an edit button when a session title is being edited.
• src/components/ui/field.tsx
  • Updated equality check from == to === for uniqueErrors?.length.
• src/hooks/useChat.ts
  • Removed the type keyword from ChatSessionState import.
• src/hooks/useSessions.ts
  • Imported SESSION_TITLE_KEY for consistent title handling.
  • Modified getSessionTitle to first check for an explicit title in session state before deriving one from the first user message.
• src/lib/adk.server.ts
  • Standardized string literal quotes and ensured consistent file endings.
• src/lib/chatCache.ts
  • Removed redundant ESLint comments related to unnecessary conditions.
  • Simplified the logic for concatenating text in applyEventToState.
• src/lib/sessions.functions.ts
  • Exported SESSION_TITLE_KEY for global use.
  • Updated createSession to accept an initialState object, allowing initial session data (like titles) to be set upon creation.
  • Introduced updateSession function, enabling PATCH requests to modify existing session state.
• src/routes/_app/index.tsx
  • Imported SESSION_TITLE_KEY.
  • Modified handleSubmit to generate a session title from the first message and pass it as initialState during session creation.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/claude.yml

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[gemini-code-assist]

Code Review

This pull request successfully implements database-backed session persistence and management of session titles. The changes span the backend, frontend, and infrastructure, including updates to use DatabaseSessionService, Cloud SQL integration, and new UI components for title display and editing. The implementation appears solid. I have a couple of minor suggestions regarding code clarity and configuration management to enhance maintainability.

[gemini-code-assist]

The root_agent is redefined here after the app object has been created. This is confusing and likely redundant if the application server is configured to use the app object, which encapsulates the agent and session service. To improve clarity and maintainability, please consider removing this line if it's not strictly necessary for a specific execution path. If it is required, a comment explaining its purpose would be very helpful.

[gemini-code-assist]

The Cloud SQL instance connection string appears to contain a hardcoded project ID (industrious-eye-145611). Hardcoding project-specific identifiers can make the configuration less portable and harder to manage across different environments (e.g., dev, staging, prod). It's recommended to use a variable that can be substituted during deployment, similar to other variables in this file.

        run.googleapis.com/cloudsql-instances: ${GCP_PROJECT_ID}:asia-east1:cofacts