diff --git a/run/db_migration_v0.1.3.ts b/run/db_migration_v0.1.3.ts
new file mode 100644
index 0000000..60aea85
--- /dev/null
+++ b/run/db_migration_v0.1.3.ts
@@ -0,0 +1,39 @@
+import db from "../src/sql";
+
+const run_migration = db.transaction(() => {
+  // SQL 1: Insert a new user
+  db.run(`DELETE FROM events
+    WHERE rowid NOT IN (
+      SELECT MIN(rowid)
+      FROM events
+      GROUP BY uid
+    );`);
+
+  // SQL 2: Update product stock
+  db.run(`CREATE TABLE events_new (
+    "event_uid" INTEGER PRIMARY KEY,
+    "uid" TEXT NOT NULL UNIQUE,
+    "title" TEXT NOT NULL,
+    "date_at" DATETIME NOT NULL,
+    "time_start" TEXT NOT NULL,
+    "time_end" TEXT NOT NULL,
+    "posted_by" TEXT NOT NULL,
+    "location" TEXT NOT NULL,
+    "event_type" TEXT NOT NULL,
+    "link" TEXT NOT NULL,
+    "description" TEXT NOT NULL,
+    "timezone" TEXT NOT NULL,
+    "notification" TEXT NOT NULL,
+    "deleteDate" INTEGER NULL
+  );`);
+
+  // SQL 3: Log the transaction
+  db.run(`INSERT INTO events_new (event_uid, uid, title, date_at, time_start, time_end, posted_by, location, event_type, link, description, timezone, notification, deleteDate)
+    SELECT event_uid, uid, title, date_at, time_start, time_end, posted_by, location, event_type, link, description, timezone, notification, deleteDate FROM events;
+  `);
+  db.run(`DROP TABLE events;
+    ALTER TABLE events_new RENAME TO events;`);
+});
+
+// Run the transaction
+run_migration();
\ No newline at end of file
diff --git a/sql/events/events_create_unique_index_uid.sql b/sql/events/events_create_unique_index_uid.sql
new file mode 100644
index 0000000..c928e12
--- /dev/null
+++ b/sql/events/events_create_unique_index_uid.sql
@@ -0,0 +1 @@
+CREATE UNIQUE INDEX idx_events_uid ON events(uid);
\ No newline at end of file
diff --git a/sql/events/events_delete_duplicate_rows.sql b/sql/events/events_delete_duplicate_rows.sql
new file mode 100644
index 0000000..b1f1234
--- /dev/null
+++ b/sql/events/events_delete_duplicate_rows.sql
@@ -0,0 +1,6 @@
+DELETE FROM events
+WHERE rowid NOT IN (
+  SELECT MIN(rowid)
+  FROM events
+  GROUP BY uid
+);
\ No newline at end of file
diff --git a/sql/events/events_find_duplicate_uid.sql b/sql/events/events_find_duplicate_uid.sql
new file mode 100644
index 0000000..331fd14
--- /dev/null
+++ b/sql/events/events_find_duplicate_uid.sql
@@ -0,0 +1,4 @@
+SELECT uid, COUNT(*) AS count
+FROM events
+GROUP BY uid
+HAVING COUNT(*) > 1;
\ No newline at end of file
diff --git a/sql/sql_migration_v0.1.3.sql b/sql/sql_migration_v0.1.3.sql
new file mode 100644
index 0000000..ae309e4
--- /dev/null
+++ b/sql/sql_migration_v0.1.3.sql
@@ -0,0 +1,29 @@
+DELETE FROM events
+WHERE rowid NOT IN (
+  SELECT MIN(rowid)
+  FROM events
+  GROUP BY uid
+);
+
+CREATE TABLE events_new (
+  "event_uid" INTEGER PRIMARY KEY,
+  "uid" TEXT NOT NULL UNIQUE,
+  "title" TEXT NOT NULL,
+  "date_at" DATETIME NOT NULL,
+  "time_start" TEXT NOT NULL,
+  "time_end" TEXT NOT NULL,
+  "posted_by" TEXT NOT NULL,
+  "location" TEXT NOT NULL,
+  "event_type" TEXT NOT NULL,
+  "link" TEXT NOT NULL,
+  "description" TEXT NOT NULL,
+  "timezone" TEXT NOT NULL,
+  "notification" TEXT NOT NULL,
+  "deleteDate" INTEGER NULL
+);
+
+INSERT INTO events_new (event_uid, uid, title, date_at, time_start, time_end, posted_by, location, event_type, link, description, timezone, notification, deleteDate)
+SELECT event_uid, uid, title, date_at, time_start, time_end, posted_by, location, event_type, link, description, timezone, notification, deleteDate FROM events;
+
+DROP TABLE events;
+ALTER TABLE events_new RENAME TO events;
\ No newline at end of file
diff --git a/src/component/event/events.ts b/src/component/event/events.ts
index 59ea846..b4ef02b 100644
--- a/src/component/event/events.ts
+++ b/src/component/event/events.ts
@@ -43,8 +43,8 @@ export class Event implements TEventEntity {
 
   static createTable (db: Database): void {
     const query = db.query(`CREATE TABLE IF NOT EXISTS "events" (
-      "event_uid" INTEGER NOT NULL,
-      "uid" TEXT NOT NULL,
+	    "event_uid" INTEGER PRIMARY KEY,
+      "uid" TEXT NOT NULL UNIQUE,
       "title" TEXT NOT NULL,
       "date_at" DATETIME NOT NULL,
       "time_start" TEXT NOT NULL,
@@ -56,10 +56,8 @@ export class Event implements TEventEntity {
       "description" TEXT NOT NULL,
       "timezone" TEXT NOT NULL,
       "notification" TEXT NOT NULL,
-      "deleteDate" INTEGER NULL,
-      PRIMARY KEY ("event_uid")
-    );
-    CREATE UNIQUE INDEX "sqlite_autoindex_events_1" ON "events" ("uid");`);
+      "deleteDate" INTEGER NULL
+    );`);
     query.run(); 
   }
 
diff --git a/src/sql.ts b/src/sql.ts
index 6d55878..9429e98 100644
--- a/src/sql.ts
+++ b/src/sql.ts
@@ -8,6 +8,8 @@ console.log(db_filepath);
 
 export const db = new Database(db_filepath);
 
+export default db;
+
 export function init () {
   Event.createTable(db);
 }