[PD1] Fixed stuff. Unmarshal still returns map[string]interface{}, need to fix

Projs/PD1/internal/server/datastore.go

@@ -154,3 +154,22 @@ func (ds DataStore) GetUserCertificate(uid string) protocol.Packet {
 	}
 	return protocol.NewSendUserCertPacket(uid, userCert)
 }
+
+func userExists(db *sql.DB, uid string) bool {
+    // Prepare the SQL statement for checking if a user exists
+    query := `
+        SELECT COUNT(*)
+        FROM users
+        WHERE UID = ?
+    `
+
+    var count int
+    // Execute the SQL query
+    err := db.QueryRow(query, uid).Scan(&count)
+    if err != nil {
+        log.Panicln("Error checking if user exists")
+    }
+
+    // If count is greater than 0, the user exists
+    return count > 0
+}