fix: correct subscription/unsubscription logic

app.py

@@ -185,7 +185,7 @@ def subscribe(username, email, timezone):
 
     # ---- Duplicate / Rate limit ----
     cur.execute("""
-        SELECT email_verified, verification_token
+        SELECT email_verified, verification_token, unsubscribed
         FROM users
         WHERE email = %s
     """, (email,))
@@ -195,13 +195,33 @@ def subscribe(username, email, timezone):
     # ---- Existing user ----
     if row:
 
-        verified, token = row
+        verified, token, unsubscribed = row
 
-        if verified:
+        # Already active
+        if verified and not unsubscribed:
             cur.close()
             conn.close()
             return "⚠️ Already subscribed"
 
+        # Was unsubscribed → resubscribe
+        if verified and unsubscribed:
+        
+            cur.execute("""
+                UPDATE users
+                SET unsubscribed = false,
+                    leetcode_username = %s,
+                    timezone = %s
+                WHERE email = %s
+            """, (username, timezone, email))
+
+        
+            conn.commit()
+            cur.close()
+            conn.close()
+        
+            return "✅ You have been re-subscribed!"
+
+
         # Resend verification
         link = f"{HF_URL}?verify={token}"