Use milliseconds as default Instant serialization/deserialization

service/fling/src/main/java/net/friedl/fling/FlingConfiguration.java

@@ -7,19 +7,28 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationConfig;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 
 @Configuration
 public class FlingConfiguration {
-    @Bean
-    public MessageDigest keyHashDigest() throws NoSuchAlgorithmException {
-        return MessageDigest.getInstance("SHA-512");
-    }
+  @Bean
+  public MessageDigest keyHashDigest() throws NoSuchAlgorithmException {
+    return MessageDigest.getInstance("SHA-512");
+  }
 
-    @Bean
-    public ObjectMapper objectMapper() {
-        ObjectMapper objectMapper = new ObjectMapper();
-        objectMapper.setSerializationInclusion(Include.NON_ABSENT);
-        return objectMapper;
-    }
+  @Bean
+  public ObjectMapper objectMapper() {
+    ObjectMapper objectMapper = new ObjectMapper()
+        .setSerializationInclusion(Include.NON_ABSENT)
+        .registerModule(new JavaTimeModule())
+        // Handle instant as milliseconds
+        .configure(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS, false)
+        .configure(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS, false);
+
+    return objectMapper;
+  }
 }

service/fling/src/main/java/net/friedl/fling/model/dto/ArtifactDto.java

@@ -23,11 +23,4 @@ public class ArtifactDto {
     private Instant uploadTime;
 
     private FlingDto fling;
-
-    @JsonProperty("uploadTime")
-    public Long getJsonUploadTime() {
-        if(uploadTime == null) return null;
-
-        return uploadTime.toEpochMilli();
-    }
 }

service/fling/src/main/java/net/friedl/fling/model/dto/FlingDto.java

@@ -93,9 +93,4 @@ public class FlingDto {
 
         return expiration;
     }
-
-    @JsonProperty("creationTime")
-    public Long getJsonUploadTime() {
-        return creationTime.toEpochMilli();
-    }
 }

service/fling/src/main/resources/application-local.yml

@@ -5,6 +5,7 @@ spring:
     username: sa
     password:
   jpa:
+    open-in-view: false
     hibernate.ddl-auto: update
     database-platform: org.hibernate.dialect.H2Dialect
   servlet:

service/fling/src/main/resources/application-prod.yml

@@ -5,6 +5,7 @@ spring:
     username: sa
     password:
   jpa:
+    open-in-view: false
     hibernate.ddl-auto: update
     database-platform: org.hibernate.dialect.H2Dialect
   servlet: