diff --git a/backend/src/main/java/org/raddatz/familienarchiv/document/DocumentDensityResult.java b/backend/src/main/java/org/raddatz/familienarchiv/document/DocumentDensityResult.java
new file mode 100644
index 00000000..5c246113
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/document/DocumentDensityResult.java
@@ -0,0 +1,13 @@
+package org.raddatz.familienarchiv.document;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import java.time.LocalDate;
+import java.util.List;
+
+public record DocumentDensityResult(
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        List<MonthBucket> buckets,
+        LocalDate minDate,
+        LocalDate maxDate
+) {}
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/document/MonthBucket.java b/backend/src/main/java/org/raddatz/familienarchiv/document/MonthBucket.java
new file mode 100644
index 00000000..eb41ccb4
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/document/MonthBucket.java
@@ -0,0 +1,10 @@
+package org.raddatz.familienarchiv.document;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+public record MonthBucket(
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED, example = "1915-08")
+        String month,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        int count
+) {}