added basic skeleton and two API endpoints to test backend stack.

internal/sqltypes/nullrawmessage.go

@@ -0,0 +1,36 @@
+package sqltypes
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"errors"
+)
+
+type NullRawMessage struct {
+	RawMessage json.RawMessage
+	Valid      bool
+}
+
+func (n *NullRawMessage) Scan(value interface{}) error {
+	if value == nil {
+		n.RawMessage, n.Valid = json.RawMessage{}, false
+		return nil
+	}
+	buf, ok := value.([]byte)
+
+	if !ok {
+		return errors.New("cannot parse to bytes")
+	}
+
+	n.RawMessage, n.Valid = buf, true
+
+	return nil
+}
+
+func (n NullRawMessage) Value() (driver.Value, error) {
+	if !n.Valid {
+		return nil, nil
+	}
+
+	return n.RawMessage, nil
+}