Improve security

Change-Id: Ia98bb629c8c81f609d3a5e4d023616a95f9c4248
diff --git a/db/missatges.sql b/db/missatges.sql
new file mode 100644
index 0000000..3769cc1
--- /dev/null
+++ b/db/missatges.sql
@@ -0,0 +1,8 @@
+CREATE TABLE missatges (
+	`id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
+	`sender_id` int(11) NOT NULL,
+	`receiver_id` int(11) NOT NULL,
+	`timestamp` timestamp NOT NULL DEFAULT current_timestamp(),
+	`content` text NOT NULL,
+	`seen` tinyint(1) DEFAULT 0
+);