diff --git a/grails5-test/src/main/groovy/AssetMirrorHelper.groovy b/grails5-test/src/main/groovy/AssetMirrorHelper.groovy
new file mode 100644
index 0000000..2e58db2
--- /dev/null
+++ b/grails5-test/src/main/groovy/AssetMirrorHelper.groovy
@@ -0,0 +1,223 @@
+package ie.thinkevolvesolve.edam
+
+import groovy.json.JsonOutput
+import groovy.json.JsonSlurper
+import groovy.sql.Sql
+import groovy.util.logging.Slf4j
+import ie.thinkevolvesolve.edam.iterator.BatchIterator
+import ie.thinkevolvesolve.edam.json.JsonOutRowsReader
+import ie.thinkevolvesolve.edam.json.TesFileUtils
+
+import java.sql.Connection
+import java.sql.DatabaseMetaData
+import java.sql.ResultSet
+import java.time.Instant
+
+@Slf4j
+class AssetMirrorHelper {
+
+    Connection sourceConnection
+    Connection targetConnection
+
+    String tableName
+    String schemaName
+    String schemaAndTableName
+
+    def fieldList
+
+    Integer batchSize = 100
+
+    Sql sourceSql
+    Sql targetSql
+
+    String insertSql
+
+    JsonSlurper slurper = new JsonSlurper()
+
+    void setBatchSize(Integer batchSize) {
+        this.batchSize = batchSize
+    }
+
+    void setSourceConnection(Connection sourceConnection) {
+        this.sourceConnection = sourceConnection
+        sourceSql = new Sql(sourceConnection)
+    }
+
+    void setFieldList(def fieldList) {
+        this.fieldList = fieldList
+        insertSql = "INSERT INTO $schemaAndTableName (asset_id,"
+        fieldList.each { f ->
+            insertSql = insertSql + f.name + (f != fieldList.last() ? "," : "")
+        }
+        insertSql = insertSql + ") VALUES (?," + ("?," * fieldList.size()).replaceAll(",\$", "") + ")"
+    }
+
+    AssetMirrorHelper(
+            Connection targetConnection,
+            Enterprises enterprise,
+            DataStores datastore,
+            String targetSchemaName
+    ) {
+        this.targetConnection = targetConnection
+
+        targetSql = new Sql(targetConnection)
+
+        this.fieldList = fieldList
+
+        tableName = datastore.getDatabaseTableName()
+
+        if (targetSchemaName == null || targetSchemaName.isEmpty()) {
+            schemaName = enterprise.getDatabaseSchemaName()
+        } else {
+            schemaName = targetSchemaName
+        }
+
+        log.info("Schema Name = {}", schemaName)
+
+        if (enterprise.dataSourceName) {
+            if (targetSchemaName == null || targetSchemaName.isEmpty()) {
+                schemaName = null
+                schemaAndTableName = tableName
+            } else {
+                schemaAndTableName = schemaName + "." + tableName
+            }
+        } else if (schemaName) {
+            schemaAndTableName = schemaName + "." + tableName
+            if (!schemaExists()) {
+                log.info("Schema $schemaName does not exist")
+                throw new RuntimeException("Schema $schemaName does not exist")
+            }
+        } else {
+            return
+        }
+
+        if (!tableExists()) {
+            log.info("Schema/Table $schemaAndTableName does not exist")
+            throw new RuntimeException("Schema/Table $schemaAndTableName does not exist")
+        }
+
+    }
+
+    def commit() {
+        targetSql.commit()
+    }
+
+    def unMirrorAsset(Assets asset) {
+
+        log.debug("DELETE FROM " + schemaAndTableName + " WHERE asset_id = :assetId", ["assetId": asset.id])
+        targetSql.execute("DELETE FROM " + schemaAndTableName + " WHERE asset_id = :assetId", ["assetId": asset.id])
+
+        log.debug("DELETE FROM " + schemaAndTableName + "_metadata WHERE asset_id = :assetId", ["assetId": asset.id])
+        targetSql.execute("DELETE FROM " + schemaAndTableName + "_metadata WHERE asset_id = :assetId", ["assetId": asset.id])
+
+    }
+
+    def mirrorAsset(Assets asset) {
+
+        targetSql.execute("DELETE FROM " + schemaAndTableName + "_metadata WHERE asset_id = :assetId", ["assetId": asset.id])
+        targetSql.execute(
+                "INSERT INTO " + schemaAndTableName + "_metadata (username, asset_id) VALUES ( :username, :assetId )",
+                ["username": asset.createdBy.username, "assetId": asset.id]
+        )
+
+        targetSql.execute("DELETE FROM " + schemaAndTableName + " WHERE asset_id = :assetId", ["assetId": asset.id])
+
+        def insertRow = []
+
+        def batchIterator
+
+        boolean writeToDiskEnabled = TesFileUtils.writeToDiskEnabled(asset.workspace.id)
+        if (writeToDiskEnabled) {
+            String jsonOutRowsFilename = TesFileUtils.getJsonOutRowFilename(asset)
+            batchIterator = new JsonOutRowsReader(jsonOutRowsFilename)
+        } else {
+            batchIterator = BatchIterator.createOutRowsIterator(sourceSql, asset.id, asset.outRowsRevision)
+        }
+
+        try {
+
+            def updateCounts = targetSql.withBatch(batchSize, insertSql) { ps ->
+
+                while (batchIterator.hasNext()) {
+
+                    def row
+                    def resultSet = batchIterator.next()
+                    if (writeToDiskEnabled) {
+                        row = resultSet.row
+                    } else {
+                        row = slurper.parseText(resultSet.jsondata)
+                    }
+
+                    insertRow = [asset.id]
+
+                    fieldList.eachWithIndex { field, count ->
+
+                        def v = null
+                        if (field.columnIndex <= row.size()) {
+                            v = row[field.columnIndex]
+                        }
+
+                        switch (field.type) {
+                            case "date":
+                                if (v) {
+                                    v = Date.from(Instant.ofEpochMilli(v))
+                                } else {
+                                    v = null
+                                }
+                                insertRow.add(v)
+                                break
+                            case "number":
+                            case "string":
+                            case "integer":
+                                insertRow.add(v)
+                                break
+                            default:
+                                throw new RuntimeException("Unknown field type " + field.type)
+                        }
+
+                    }
+
+                    ps.addBatch(insertRow)
+                }
+            }
+            if (writeToDiskEnabled) {
+                batchIterator.close()
+            }
+
+        } catch (Exception e) {
+            log.error("" + e)
+            log.error(" SQL " + insertSql)
+            log.error(" ROW (#" + insertRow.size() + ") " + JsonOutput.toJson(insertRow))
+            log.debug("", e)
+
+            throw e
+        }
+
+        targetSql.commit()
+    }
+
+
+    private boolean schemaExists() {
+        // Check for the SQL table
+        DatabaseMetaData meta = targetConnection.getMetaData()
+        ResultSet rs = meta.getSchemas()
+        while (rs.next()) {
+            if (rs.getString("TABLE_SCHEM").equalsIgnoreCase(schemaName)) {
+                log.info("Schema " + schemaName + " exists")
+                return true
+            }
+        }
+        return false
+    }
+
+
+    private boolean tableExists() {
+        DatabaseMetaData meta = targetConnection.getMetaData()
+        if (!tableName) {
+            return false
+        }
+        ResultSet rs = meta.getTables(null, schemaName?.toUpperCase(), tableName.toUpperCase(), null)
+        return rs.next()
+    }
+
+}