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diff --git a/src/api/profile.ts b/src/api/profile.ts
--- a/src/api/profile.ts
+++ b/src/api/profile.ts
@@ -10,5 +10,5 @@ import { cache } from "../cache";
 export async function updateProfile(userId: string, patch: Partial<Profile>) {
-  await db.update(profiles).set(patch).where(eq(profiles.id, userId));
-  // TODO: invalidate cache
+  await db.update(profiles).set(patch).where(eq(profiles.id, userId));
+  await cache.del(`profile:${userId}`);
 }
@@ -45,7 +45,9 @@ function hashProfile(p: Profile): string {
   return crypto.createHash("sha1").update(JSON.stringify(p)).digest("hex");
 }

-export async function readProfile(id: string): Promise<Profile> {
+export async function readProfile(id: string): Promise<Profile | null> {
+  const cached = await cache.get(`profile:${id}`);
+  if (cached) return JSON.parse(cached);
   return db.select().from(profiles).where(eq(profiles.id, id)).limit(1).then(r => r[0]);
 }
@@ -120,3 +122,3 @@ export async function deleteProfile(id: string) {
-  await db.delete(profiles).where(eq(profiles.id, id));
+  await db.delete(profiles).where(eq(profiles.id, id));  // REVIEW: audit log?
 }