Modify article/answer content schema to TEXT and fix timestamps

src/main/java/me/sjtumeow/meow/model/Answer.java

@@ -1,17 +1,20 @@
 package me.sjtumeow.meow.model;
 
-import com.fasterxml.jackson.annotation.JsonBackReference;
+import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
 
 import org.hibernate.annotations.Formula;
 
+import com.fasterxml.jackson.annotation.JsonBackReference;
+
 @Entity
 public class Answer extends Item {
 
     private static final long serialVersionUID = 1L;
 
+    @Column(columnDefinition = "TEXT")
     private String content;
 
     @JsonBackReference

src/main/java/me/sjtumeow/meow/model/Article.java

@@ -1,13 +1,17 @@
 package me.sjtumeow.meow.model;
 
+import javax.persistence.Column;
 import javax.persistence.Entity;
 
 @Entity
 public class Article extends Item {
 
     private static final long serialVersionUID = 1L;
 
-    String title, summary, content, cover;
+    String title, summary, cover;
+
+    @Column(columnDefinition = "TEXT")
+    String content;
 
     public Article() {
         type = Item.ITEM_TYPE_ARTICLE;

src/main/java/me/sjtumeow/meow/util/LocalDateAttributeConverter.java

@@ -0,0 +1,21 @@
+package me.sjtumeow.meow.util;
+
+import java.sql.Timestamp;
+import java.time.LocalDateTime;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+@Converter(autoApply = true)
+public class LocalDateAttributeConverter implements AttributeConverter<LocalDateTime, Timestamp> {
+
+    @Override
+    public Timestamp convertToDatabaseColumn(LocalDateTime localDateTime) {
+        return (localDateTime == null ? null : Timestamp.valueOf(localDateTime));
+    }
+
+    @Override
+    public LocalDateTime convertToEntityAttribute(Timestamp timestamp) {
+        return (timestamp == null ? null : timestamp.toLocalDateTime());
+    }
+}

src/main/java/me/sjtumeow/meow/util/LocalDateTimeAttributeConverter.java

@@ -0,0 +1,25 @@
+package me.sjtumeow.meow.util;
+
+import java.sql.Date;
+import java.time.LocalDate;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+/**
+ * Custom converter class that enables usage of LocalDateTime with the DB
+ */
+
+@Converter(autoApply = true)
+public class LocalDateTimeAttributeConverter implements AttributeConverter<LocalDate, Date> {
+
+    @Override
+    public Date convertToDatabaseColumn(LocalDate localDate) {
+        return (localDate == null ? null : Date.valueOf(localDate));
+    }
+
+    @Override
+    public LocalDate convertToEntityAttribute(Date date) {
+        return (date == null ? null : date.toLocalDate());
+    }
+}