diff --git a/src/main/java/de/ph87/data/chart/Chart.java b/src/main/java/de/ph87/data/chart/Chart.java
new file mode 100644
index 0000000..3091f52
--- /dev/null
+++ b/src/main/java/de/ph87/data/chart/Chart.java
@@ -0,0 +1,26 @@
+package de.ph87.data.chart;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.NonNull;
+import lombok.ToString;
+
+@Entity
+@Getter
+@ToString
+@NoArgsConstructor
+public class Chart {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private long id;
+
+  @Version
+  private long version;
+
+  @NonNull
+  @Column(nullable = false)
+  private String name = "";
+
+}
diff --git a/src/main/java/de/ph87/data/chart/axis/Axis.java b/src/main/java/de/ph87/data/chart/axis/Axis.java
new file mode 100644
index 0000000..09f3556
--- /dev/null
+++ b/src/main/java/de/ph87/data/chart/axis/Axis.java
@@ -0,0 +1,35 @@
+package de.ph87.data.chart.axis;
+
+import de.ph87.data.chart.Chart;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.NonNull;
+import lombok.ToString;
+
+@Entity
+@Getter
+@ToString
+@NoArgsConstructor
+public class Axis {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private long id;
+
+  @Version
+  private long version;
+
+  @NonNull
+  @ManyToOne(optional = false)
+  private Chart chart;
+
+  @NonNull
+  @Column(nullable = false)
+  private String name = "";
+
+  public Axis(@NonNull final Chart chart) {
+    this.chart = chart;
+  }
+
+}
diff --git a/src/main/java/de/ph87/data/chart/axis/graph/Graph.java b/src/main/java/de/ph87/data/chart/axis/graph/Graph.java
new file mode 100644
index 0000000..aebaa4d
--- /dev/null
+++ b/src/main/java/de/ph87/data/chart/axis/graph/Graph.java
@@ -0,0 +1,41 @@
+package de.ph87.data.chart.axis.graph;
+
+import de.ph87.data.chart.axis.Axis;
+import de.ph87.data.series.Series;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.NonNull;
+import lombok.ToString;
+
+@Entity
+@Getter
+@ToString
+@NoArgsConstructor
+public class Graph {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private long id;
+
+  @Version
+  private long version;
+
+  @NonNull
+  @ManyToOne(optional = false)
+  private Axis axis;
+
+  @NonNull
+  @Column(nullable = false)
+  private String name = "";
+
+  @NonNull
+  @ManyToOne(optional = false)
+  private Series series;
+
+  public Graph(@NonNull final Axis axis, @NonNull final Series series) {
+    this.axis = axis;
+    this.series = series;
+  }
+
+}