refs #703: route schema metadata through MyBatis

src/main/java/com/cloudhandson/vpdbackoffice/domain/schemametadata/SchemaMetadataColumnRow.java

@@ -0,0 +1,12 @@
+package com.cloudhandson.vpdbackoffice.domain.schemametadata;
+
+/**
+ * Database row used only while assembling the schema metadata screen.
+ */
+public record SchemaMetadataColumnRow(
+    String columnName,
+    String dataType,
+    String nullable,
+    String comment
+) {
+}