Add meeting assistant speech and summary automation

MeetingAssistant/Speakers/SpeakerIdentityDatabaseInitializer.cs

@@ -0,0 +1,33 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace MeetingAssistant.Speakers;
+
+public sealed class SpeakerIdentityDatabaseInitializer : IHostedService
+{
+    private static readonly SemaphoreSlim InitializeLock = new(1, 1);
+    private readonly IDbContextFactory<SpeakerIdentityDbContext> dbContextFactory;
+
+    public SpeakerIdentityDatabaseInitializer(IDbContextFactory<SpeakerIdentityDbContext> dbContextFactory)
+    {
+        this.dbContextFactory = dbContextFactory;
+    }
+
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        await InitializeLock.WaitAsync(cancellationToken);
+        try
+        {
+            await using var context = await dbContextFactory.CreateDbContextAsync(cancellationToken);
+            await SpeakerIdentitySchema.EnsureCreatedOrUpdatedAsync(context, cancellationToken);
+        }
+        finally
+        {
+            InitializeLock.Release();
+        }
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+}