fix: retry transient postgres polling saves

src/LiveRecorder.WebApi/Program.cs

@@ -23,6 +23,7 @@ using LiveRecorder.Infrastructure.Services;
 using LiveRecorder.WebApi.Middleware;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.OpenApi.Models;
+using Npgsql;
 
 var builder = WebApplication.CreateBuilder(args);
 var resetRecordingData = args.Contains("--reset-recording-data", StringComparer.OrdinalIgnoreCase);
@@ -114,9 +115,32 @@ builder.Services.AddHttpClient("bilibili", client =>
 var defaultConnection = builder.Configuration.GetConnectionString("DefaultConnection")
     ?? throw new InvalidOperationException("ConnectionStrings:DefaultConnection is required.");
 
+var connectionStringBuilder = new NpgsqlConnectionStringBuilder(defaultConnection);
+if (connectionStringBuilder.Timeout <= 0)
+{
+    connectionStringBuilder.Timeout = 15;
+}
+
+if (connectionStringBuilder.CommandTimeout <= 0)
+{
+    connectionStringBuilder.CommandTimeout = 60;
+}
+
+if (connectionStringBuilder.KeepAlive <= 0)
+{
+    connectionStringBuilder.KeepAlive = 30;
+}
+
 builder.Services.AddDbContext<LiveRecorderDbContext>(options =>
-    options.UseNpgsql(defaultConnection, npgsql =>
-        npgsql.MigrationsAssembly(typeof(LiveRecorderDbContext).Assembly.FullName)));
+    options.UseNpgsql(connectionStringBuilder.ConnectionString, npgsql =>
+    {
+        npgsql.MigrationsAssembly(typeof(LiveRecorderDbContext).Assembly.FullName);
+        npgsql.CommandTimeout(connectionStringBuilder.CommandTimeout);
+        npgsql.EnableRetryOnFailure(
+            maxRetryCount: 5,
+            maxRetryDelay: TimeSpan.FromSeconds(10),
+            errorCodesToAdd: null);
+    }));
 
 builder.Services.AddScoped<IUnitOfWork>(provider => provider.GetRequiredService<LiveRecorderDbContext>());
 builder.Services.AddScoped<IAppSettingRepository, AppSettingRepository>();