Initial

src/ClaudeMailbox/Data/Repositories/MailboxRepository.cs

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+using ClaudeMailbox.Data.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace ClaudeMailbox.Data.Repositories;
+
+public sealed class MailboxRepository
+{
+    private readonly MailboxDbContext _db;
+
+    public MailboxRepository(MailboxDbContext db) => _db = db;
+
+    public async Task<Mailbox> UpsertAsync(string name, CancellationToken ct = default)
+    {
+        var now = DateTime.UtcNow;
+        var row = await _db.Mailboxes.FirstOrDefaultAsync(m => m.Name == name, ct);
+        if (row is null)
+        {
+            row = new Mailbox { Name = name, CreatedAt = now, LastSeenAt = now };
+            _db.Mailboxes.Add(row);
+        }
+        else
+        {
+            row.LastSeenAt = now;
+        }
+        await _db.SaveChangesAsync(ct);
+        return row;
+    }
+
+    public async Task<IReadOnlyList<Mailbox>> ListAsync(CancellationToken ct = default)
+    {
+        return await _db.Mailboxes.AsNoTracking().OrderBy(m => m.Name).ToListAsync(ct);
+    }
+}