Implement cross-device session persistence with D1 database

[Copilot]

Session history was stored only in localStorage, limiting access to a single browser. Users logging in from different devices couldn't access their conversation history.

Changes

Database Layer

• Added Cloudflare D1 schema with users, chat_sessions, chat_messages tables
• Created database helper functions in src/lib/server/db.ts for CRUD operations
• User sessions scoped by GitHub user ID with foreign key constraints

API Layer

• Implemented 6 RESTful endpoints under /api/sessions for session management
• All endpoints require GitHub OAuth authentication
• Type-safe request/response handling with proper error codes

Client Layer

• Extended sessionStore with syncFromDatabase(), syncSessionToDatabase(), and deleteSessionFromDatabase() methods
• localStorage maintained as client-side cache for performance
• Background synchronization transparent to user

Security

• Replaced Math.random() with crypto.randomUUID() for session ID generation
• Prepared statements prevent SQL injection
• All queries filter by authenticated user's GitHub ID

Example Usage

// Sessions automatically sync to database on creation
sessionStore.createSession('starspacegroup/apollo');

// Load sessions from database on login
await sessionStore.syncFromDatabase();

// Sessions available across all devices for the same GitHub account

Configuration

Local development:

npx wrangler d1 execute DB --local --file=./schema.sql

Production requires D1 database creation and wrangler.jsonc update with database ID.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• sparrow.cloudflare.com
  • Triggering command: /usr/local/bin/node --no-warnings --experimental-vm-modules /home/REDACTED/work/apollo/apollo/node_modules/wrangler/wrangler-dist/cli.js d1 execute DB --local --file=./schema.sql (dns block)
  • Triggering command: /usr/local/bin/node --no-warnings --experimental-vm-modules /home/REDACTED/work/apollo/apollo/node_modules/wrangler/wrangler-dist/cli.js d1 execute DB --local --command=SELECT name FROM sqlite_master WHERE type='table' ORDER BY name; (dns block)
• workers.cloudflare.com
  • Triggering command: /usr/local/bin/node --no-warnings --experimental-vm-modules /home/REDACTED/work/apollo/apollo/node_modules/wrangler/wrangler-dist/cli.js d1 execute DB --local --file=./schema.sql (dns block)
  • Triggering command: /usr/local/bin/node --no-warnings --experimental-vm-modules /home/REDACTED/work/apollo/apollo/node_modules/wrangler/wrangler-dist/cli.js d1 execute DB --local --command=SELECT name FROM sqlite_master WHERE type='table' ORDER BY name; (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Consistent session history across devices using GitHub login</issue_title>
<issue_description>As a user
I want my session history to be consistent across all devices
So that I have a seamless experience regardless of where I log in

Acceptance Criteria

• Given I log in with my GitHub account on one device, when I check my session history, then it should be recorded in a database
• Given I log in with the same GitHub account on a second device, when I check my session history, then it should be identical to the history on the first device

Additional Details

• Implement a database to store user sessions
• Ensure data consistency and security across devices
• Utilize the existing GitHub OAuth process for user authentication and data retrieval

Definition of Done

• Database is implemented and integrated with GitHub logins
• Session history is consistent across all devices for GitHub users
• Security measures are in place to protect user data
• Documentation is updated with details on how session history works</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Consistent session history across devices using GitHub login #15

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