add NodeEntity

cql/01-nodes.cql

@@ -0,0 +1,7 @@
+-- Create a table
+CREATE TABLE IF NOT EXISTS device_configuration.nodes
+(
+    id            UUID PRIMARY KEY,
+    timestamp     TIMESTAMP,
+    configuration TEXT
+);

src/main/kotlin/ltd/hlaeja/entity/NodeEntity.kt

@@ -0,0 +1,14 @@
+package ltd.hlaeja.entity
+
+import java.time.Instant
+import java.util.UUID
+import org.springframework.data.cassandra.core.mapping.PrimaryKey
+import org.springframework.data.cassandra.core.mapping.Table
+
+@Table("nodes")
+data class NodeEntity(
+    @PrimaryKey
+    val id: UUID,
+    val timestamp: Instant,
+    val configuration: String,
+)