Simplify JPA entities with Panache.

Change-Id: I09cbea27e6f81e4092dcbbc2f56e5abb9494a945
diff --git a/src/main/java/eu/mulk/mulkcms2/entity/UsedTransactionKey.java b/src/main/java/eu/mulk/mulkcms2/entity/UsedTransactionKey.java
index 7d562a6..f1a6f68 100644
--- a/src/main/java/eu/mulk/mulkcms2/entity/UsedTransactionKey.java
+++ b/src/main/java/eu/mulk/mulkcms2/entity/UsedTransactionKey.java
@@ -1,7 +1,6 @@
 package eu.mulk.mulkcms2.entity;
 
 import io.quarkus.hibernate.orm.panache.PanacheEntityBase;
-import java.util.Objects;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.Id;
@@ -11,32 +10,7 @@
 @Table(name = "used_transaction_keys", schema = "public", catalog = "mulkcms")
 public class UsedTransactionKey extends PanacheEntityBase {
 
-  private long key;
-
   @Id
   @Column(name = "key", nullable = false)
-  public long getKey() {
-    return key;
-  }
-
-  public void setKey(long key) {
-    this.key = key;
-  }
-
-  @Override
-  public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
-    if (o == null || getClass() != o.getClass()) {
-      return false;
-    }
-    UsedTransactionKey that = (UsedTransactionKey) o;
-    return key == that.key;
-  }
-
-  @Override
-  public int hashCode() {
-    return Objects.hash(key);
-  }
+  public long key;
 }