diff --git a/server/package.json b/server/package.json
index 195fac104..d7c2d149c 100644
--- a/server/package.json
+++ b/server/package.json
@@ -85,7 +85,7 @@
 		"rimraf": "3.0.2",
 		"safe-json-stringify": "1.2.0",
 		"seq-logging": "1.1.1",
-		"tachi-common": "0.10.2",
+		"tachi-common": "0.11.1",
 		"ts-node": "10.4.0",
 		"tsconfig-paths": "3.12.0",
 		"typescript": "4.5.5",
diff --git a/server/pnpm-lock.yaml b/server/pnpm-lock.yaml
index 69996cbde..7e60d7acd 100644
--- a/server/pnpm-lock.yaml
+++ b/server/pnpm-lock.yaml
@@ -65,7 +65,7 @@ specifiers:
   safe-json-stringify: 1.2.0
   seq-logging: 1.1.1
   supertest: 6.2.2
-  tachi-common: 0.10.2
+  tachi-common: 0.11.1
   tap: 15.1.6
   ts-node: 10.4.0
   tsconfig-paths: 3.12.0
@@ -112,7 +112,7 @@ dependencies:
   rimraf: 3.0.2
   safe-json-stringify: 1.2.0
   seq-logging: 1.1.1
-  tachi-common: 0.10.2
+  tachi-common: 0.11.1
   ts-node: 10.4.0_2615db9039ce432b4abf2fc39ef336ec
   tsconfig-paths: 3.12.0
   typescript: 4.5.5
@@ -5364,8 +5364,8 @@ packages:
     engines: {node: '>= 0.4'}
     dev: true
 
-  /tachi-common/0.10.2:
-    resolution: {integrity: sha512-hU3qQUacbL9rbiFibePzKeP+WuDXyKgcOlGNEXgZZIWZ3cpeEwFm6tk8PtVAoQPa5nPfXobmEmWYN4eGOQoKjA==}
+  /tachi-common/0.11.1:
+    resolution: {integrity: sha512-gLhFJG84YfzrHdoHXlVqxnBOjiKsI2xaivscmHVdZr9lqKaPUzBYmkMKZ5IsWdFxYXo8Ry+JrkZ83WPuSuVWEg==}
     dependencies:
       '@types/express-serve-static-core': 4.17.28
       '@types/mongodb': 3.6.18
diff --git a/server/src/external/mongo/db.ts b/server/src/external/mongo/db.ts
index ccb60cf6f..c7bfe3eba 100644
--- a/server/src/external/mongo/db.ts
+++ b/server/src/external/mongo/db.ts
@@ -38,6 +38,7 @@ import {
 	GoalSubscriptionDocument,
 	MilestoneSubscriptionDocument,
 	UserSettings,
+	NotificationDocument,
 } from "tachi-common";
 import { GetMillisecondsSince } from "utils/misc";
 import { MigrationDocument, PrivateUserInfoDocument } from "utils/types";
@@ -193,6 +194,7 @@ const db = {
 	"recent-folder-views": monkDB.get<RecentlyViewedFolderDocument>("recent-folder-views"),
 	"milestone-sets": monkDB.get<MilestoneSetDocument>("milestone-sets"),
 	migrations: monkDB.get<MigrationDocument>("migrations"),
+	notifications: monkDB.get<NotificationDocument>("notifications"),
 };
 
 export type StaticDatabases = Exclude<keyof typeof db, "songs" | "charts">;
diff --git a/server/src/lib/notifications/notifications.ts b/server/src/lib/notifications/notifications.ts
new file mode 100644
index 000000000..eb645dd20
--- /dev/null
+++ b/server/src/lib/notifications/notifications.ts
@@ -0,0 +1,40 @@
+import db from "external/mongo/db";
+import { integer, NotificationBody, NotificationDocument } from "tachi-common";
+import { Random20Hex } from "utils/misc";
+
+/**
+ * Send a notification to a user.
+ *
+ * @param title - A human friendly title for this notification.
+ * @param toUserID - The user to send the notification to.
+ * @param body - The body of the notification.
+ */
+export async function SendNotification(title: string, toUserID: integer, body: NotificationBody) {
+	const notification: NotificationDocument = {
+		title,
+		sentTo: toUserID,
+		read: false,
+		sentAt: Date.now(),
+		notifID: `N${Random20Hex()}`,
+		body,
+	};
+
+	await db.notifications.insert(notification);
+}
+
+/**
+ * Mark a notification as read. This is notably different to deleting a notification,
+ * and is typically done when the user acknowledges the existence of the notification.
+ */
+export function ReadNotification(notifID: string) {
+	return db.notifications.update(
+		{ notifID },
+		{
+			$set: { read: true },
+		}
+	);
+}
+
+export function DeleteNotification(notifID: string) {
+	return db.notifications.remove({ notifID });
+}