diff --git a/server/storage.ts b/server/storage.ts
index 3b99116..7dfa3e8 100644
--- a/server/storage.ts
+++ b/server/storage.ts
@@ -43,7 +43,15 @@ export class DatabaseStorage implements IStorage {
   }
 
   async importNewsletter(newsletter: InsertNewsletter): Promise<void> {
-    await db.insert(newsletters).values(newsletter);
+    try {
+      await db.insert(newsletters).values(newsletter);
+    } catch (error: any) {
+      if (error.code === '23505') { // PostgreSQL unique violation code
+        console.log(`Newsletter with URL ${newsletter.url} already exists, skipping`);
+      } else {
+        throw error;
+      }
+    }
   }
 
   async importNewsletters(newNewsletters: InsertNewsletter[]): Promise<void> {
diff --git a/shared/schema.ts b/shared/schema.ts
index d571c7f..bbc593a 100644
--- a/shared/schema.ts
+++ b/shared/schema.ts
@@ -13,7 +13,7 @@ export const newsletters = pgTable("newsletters", {
   id: serial("id").primaryKey(),
   title: text("title").notNull(),
   date: date("date").notNull(),
-  url: text("url").notNull(),
+  url: text("url").notNull().unique(),
   description: text("description"),
   thumbnail: text("thumbnail"),
   content: text("content"),