Handle stored models in backup/shutdown_new and restore

This also underlines the problem of the old shutdown dropping resources.
We also always load the stored models for convenience (and avoid unexpectedly unloaded models inside Aura)

Author: FlorentinD

model-catalog-api/src/main/java/org/neo4j/gds/core/model/ModelHash.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) "Neo4j"
+ * Neo4j Sweden AB [http://neo4j.com]
+ *
+ * This file is part of Neo4j.
+ *
+ * Neo4j is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.neo4j.gds.core.model;
+
+import org.neo4j.gds.annotation.ValueClass;
+import org.neo4j.gds.model.ModelConfig;
+
+import java.time.ZonedDateTime;
+
+@ValueClass
+public
+interface ModelHash {
+    String user();
+
+    String name();
+
+    ZonedDateTime timestamp();
+
+    static ModelHash of(ModelMetaData<? extends ModelConfig, ?> modelMetaData) {
+        return ImmutableModelHash.of(
+            modelMetaData.creator(),
+            modelMetaData.name(),
+            modelMetaData.creationTime()
+        );
+    }
+
+    static ModelHash of(Model<?, ?, ?> model) {
+        return ImmutableModelHash.of(
+            model.creator(),
+            model.name(),
+            model.creationTime()
+        );
+    }
+}

model-catalog-api/src/main/java/org/neo4j/gds/core/model/ModelMetaData.java

@@ -19,6 +19,7 @@
  */
 package org.neo4j.gds.core.model;
 
+import org.immutables.value.Value;
 import org.neo4j.gds.annotation.ValueClass;
 import org.neo4j.gds.api.schema.GraphSchema;
 import org.neo4j.gds.config.ToMapConvertible;
@@ -27,6 +28,8 @@
 import java.time.ZonedDateTime;
 import java.util.List;
 
+import static org.neo4j.gds.core.model.Model.ALL_USERS;
+
 @ValueClass
 public interface ModelMetaData<CONFIG extends ModelConfig, INFO extends ToMapConvertible> {
 
@@ -45,4 +48,9 @@ public interface ModelMetaData<CONFIG extends ModelConfig, INFO extends ToMapCon
     ZonedDateTime creationTime();
 
     INFO customInfo();
+
+    @Value.Derived
+    default boolean isPublished() {
+        return sharedWith().contains(ALL_USERS);
+    }
 }