diff --git a/api/deploy_db/deploy/0028-mf-info.sql b/api/deploy_db/deploy/0028-mf-info.sql
index 0c0fb8b..5dac782 100644
--- a/api/deploy_db/deploy/0028-mf-info.sql
+++ b/api/deploy_db/deploy/0028-mf-info.sql
@@ -71,4 +71,25 @@ create table cliente_tag (
 alter table quiz_config add column tag json not null default '[]';
 alter table quiz_config alter tag set not null;
 
+CREATE OR REPLACE FUNCTION prevent_duplicate_cliente_tag()
+RETURNS TRIGGER AS $$
+BEGIN
+    INSERT INTO cliente_tag (cliente_id, mf_tag_id, created_on)
+    VALUES (NEW.cliente_id, NEW.mf_tag_id, NOW())
+    ON CONFLICT (cliente_id, mf_tag_id) DO NOTHING;
+
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER prevent_duplicate_cliente_tag_trigger
+BEFORE INSERT ON cliente_tag
+FOR EACH ROW
+EXECUTE FUNCTION prevent_duplicate_cliente_tag();
+
+ALTER TABLE cliente_tag
+ADD CONSTRAINT unique_cliente_tag UNIQUE (cliente_id, mf_tag_id);
+
+
+
 COMMIT;