diff --git a/Cargo.toml b/Cargo.toml
index 6e0b46b..e14158d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -79,6 +79,7 @@ tower-http = "0.5"
 tracing = "0.1"
 tracing-subscriber = "0.3"
 ts-rs = "7"
+ulid = "1"
 unicode-segmentation = "1.10"
 url = "2.3"
 walkdir = "2.3"
@@ -108,6 +109,7 @@ tokio = { workspace = true, features = ["full"] }
 tokio-stream = { workspace = true }
 tower = { workspace = true }
 tower-http = { workspace = true, features = ["cors", "trace", "fs"] }
+ulid = { workspace = true }
 url = { workspace = true }
 idna = { workspace = true }
 
@@ -118,6 +120,7 @@ tracing = { workspace = true }
 
 cfg-if = { workspace = true }
 
+bytes = { workspace = true }
 compact_str = { workspace = true }
 either = { workspace = true }
 futures = { workspace = true }
diff --git a/src/service/gen_id.rs b/src/service/gen_id.rs
new file mode 100644
index 0000000..e7620a8
--- /dev/null
+++ b/src/service/gen_id.rs
@@ -0,0 +1,29 @@
+use std::{sync::Arc, time::SystemTime};
+
+use super::MagnetarService;
+
+pub struct GenIdService;
+
+impl GenIdService {
+    pub fn new_id(&self) -> ulid::Ulid {
+        ulid::Ulid::new()
+    }
+
+    pub fn new_id_str(&self) -> String {
+        self.new_id().to_string()
+    }
+
+    pub fn new_for_time(&self, time: impl Into<SystemTime>) -> ulid::Ulid {
+        ulid::Ulid::from_datetime(time.into())
+    }
+
+    pub fn new_str_for_time(&self, time: impl Into<SystemTime>) -> String {
+        self.new_for_time(time).to_string()
+    }
+}
+
+impl AsRef<GenIdService> for Arc<MagnetarService> {
+    fn as_ref(&self) -> &GenIdService {
+        &self.gen_id
+    }
+}
diff --git a/src/service/mod.rs b/src/service/mod.rs
index 0ff5683..11036c9 100644
--- a/src/service/mod.rs
+++ b/src/service/mod.rs
@@ -1,3 +1,4 @@
+use gen_id::GenIdService;
 use magnetar_common::config::MagnetarConfig;
 use magnetar_model::{ck, CalckeyCache, CalckeyModel};
 use std::fmt::{Debug, Formatter};
@@ -5,15 +6,16 @@ use std::time::Duration;
 use thiserror::Error;
 
 pub mod emoji_cache;
+pub mod gen_id;
 pub mod generic_id_cache;
 pub mod instance_cache;
 pub mod instance_meta_cache;
 pub mod local_user_cache;
 
 #[non_exhaustive]
-
 pub struct MagnetarService {
     pub db: CalckeyModel,
+    pub gen_id: GenIdService,
     pub cache: CalckeyCache,
     pub config: &'static MagnetarConfig,
     pub local_user_cache: local_user_cache::LocalUserCacheService,
@@ -67,6 +69,14 @@ impl MagnetarService {
             remote_instance_cache,
             emoji_cache,
             drive_file_cache,
+            gen_id: GenIdService,
         })
     }
+
+    pub fn service<T>(&self) -> &T
+    where
+        Self: AsRef<T>,
+    {
+        self.as_ref()
+    }
 }