Add flyway database migration tool. Read diva news from database

src/main/java/icu/samnyan/aqua/sega/general/model/PropertyEntry.java

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+package icu.samnyan.aqua.sega.general.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.io.Serializable;
+
+/**
+ * @author samnyan (privateamusement@protonmail.com)
+ */
+@Entity(name = "ServerPropertyEntry")
+@Table(name = "property")
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class PropertyEntry implements Serializable {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(unique = true)
+    private String propertyKey;
+
+    private String propertyValue;
+
+    public PropertyEntry(String propertyKey, String propertyValue) {
+        this.propertyKey = propertyKey;
+        this.propertyValue = propertyValue;
+    }
+}