diff --git a/build.gradle.kts b/build.gradle.kts
index abfc044..80d7ccd 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -3,6 +3,7 @@ plugins {
     kotlin("plugin.spring") version "2.2.21"
     id("org.springframework.boot") version "4.0.0"
     id("io.spring.dependency-management") version "1.1.7"
+    kotlin("plugin.jpa") version "2.2.21"
 }
 
 group = "net.halfbinary"
@@ -47,6 +48,12 @@ kotlin {
     }
 }
 
+allOpen {
+    annotation("jakarta.persistence.Entity")
+    annotation("jakarta.persistence.MappedSuperclass")
+    annotation("jakarta.persistence.Embeddable")
+}
+
 tasks.withType<Test> {
     useJUnitPlatform()
 }