Summary

Automatic message archiving to SQLite with resilient backfill that never gives up.

• Backfill paginates from newest to oldest across all text channels
• When API returns empty (cold storage), retries with exponential backoff 60s → 30min
• Retry loop runs forever in background until Discord returns data
• Real-time capture of new messages after backfill
• Filters: skips bots, messages ≤2 chars, non-letter-starting

New Files

• src/Models/MessageRecord.cs — EF Core entity
• src/Models/ArchiveDbContext.cs — SQLite DbContext
• src/Services/MessageArchiveService.cs — Backfill + real-time + retry loop
• src/Modules/ArchiveModule.cs — Slash commands
• docker-compose.stage.yml — Isolated stage compose