diff --git a/src/Hc900Crawler/Program.cs b/src/Hc900Crawler/Program.cs
index 6bc5e28..8631a3e 100644
--- a/src/Hc900Crawler/Program.cs
+++ b/src/Hc900Crawler/Program.cs
@@ -49,8 +49,11 @@ builder.Services.Configure<Hc900Options>(builder.Configuration.GetSection("Hc900
 
 // ── PostgreSQL (hc900 schema) ─────────────────────────────────────────────────
 Directory.CreateDirectory("data");
+// optionsLifetime=Singleton: AddDbContextFactory(싱글톤)와 병용 시 DbContextOptions를
+// 싱글톤으로 공유해야 함(불변 설정이라 동작 무변경; DbContext 자체는 Scoped 유지).
 builder.Services.AddDbContext<Hc900DbContext>(opt =>
-    opt.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
+    opt.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")),
+    optionsLifetime: ServiceLifetime.Singleton);
 builder.Services.AddScoped<IExperionDbService, Hc900DbService>();
 builder.Services.AddScoped<ITrendService, TrendService>();
 builder.Services.AddDbContextFactory<Hc900DbContext>();