diff --git a/internal/database/migrations/sqlite/0003_uniq_id.up.sql b/internal/database/migrations/sqlite/0003_uniq_id.up.sql
new file mode 100644
index 0000000..982b3ff
--- /dev/null
+++ b/internal/database/migrations/sqlite/0003_uniq_id.up.sql
@@ -0,0 +1,22 @@
+-- Create a temporary table
+CREATE TABLE IF NOT EXISTS bookmark_temp(
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    url TEXT NOT NULL,
+    title TEXT NOT NULL,
+    excerpt TEXT NOT NULL DEFAULT "",
+    author TEXT NOT NULL DEFAULT "",
+    public INTEGER NOT NULL DEFAULT 0,
+    modified TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    has_content BOOLEAN DEFAULT FALSE NOT NULL,
+    CONSTRAINT bookmark_url_UNIQUE UNIQUE(url)
+);
+
+-- Copy data from the original table to the temporary table
+INSERT INTO bookmark_temp (id, url, title, excerpt, author, public, modified, has_content)
+SELECT id, url, title, excerpt, author, public, modified, has_content FROM bookmark;
+
+-- Drop the original table
+DROP TABLE bookmark;
+
+-- Rename the temporary table to the original table name
+ALTER TABLE bookmark_temp RENAME TO bookmark;
diff --git a/internal/database/sqlite.go b/internal/database/sqlite.go
index 4cc117b..e759d84 100644
--- a/internal/database/sqlite.go
+++ b/internal/database/sqlite.go
@@ -59,6 +59,7 @@ var sqliteMigrations = []migration{
 		return nil
 	}),
 	newFileMigration("0.3.0", "0.4.0", "sqlite/0002_denormalize_content"),
+	newFileMigration("0.4.0", "0.5.0", "sqlite/0003_uniq_id"),
 }
 
 // SQLiteDatabase is implementation of Database interface