feat: add generation source handling for task creation and updates

backend/src/main/kotlin/com/condado/newsletter/model/EntityTask.kt

@@ -3,6 +3,8 @@ package com.condado.newsletter.model
 import jakarta.persistence.CascadeType
 import jakarta.persistence.Column
 import jakarta.persistence.Entity
+import jakarta.persistence.EnumType
+import jakarta.persistence.Enumerated
 import jakarta.persistence.FetchType
 import jakarta.persistence.GeneratedValue
 import jakarta.persistence.GenerationType
@@ -37,6 +39,10 @@ class EntityTask(
     @Column(name = "email_lookback", nullable = false)
     val emailLookback: String,
 
+    @Enumerated(EnumType.STRING)
+    @Column(name = "generation_source", nullable = false)
+    val generationSource: TaskGenerationSource = TaskGenerationSource.LLAMA,
+
     @Column(nullable = false)
     val active: Boolean = true,
 

backend/src/main/kotlin/com/condado/newsletter/model/TaskGenerationSource.kt

@@ -0,0 +1,19 @@
+package com.condado.newsletter.model
+
+import com.fasterxml.jackson.annotation.JsonCreator
+import com.fasterxml.jackson.annotation.JsonValue
+
+enum class TaskGenerationSource(
+    @get:JsonValue val value: String
+) {
+    OPENAI("openai"),
+    LLAMA("llama");
+
+    companion object {
+        @JvmStatic
+        @JsonCreator
+        fun from(value: String): TaskGenerationSource =
+            entries.firstOrNull { it.value.equals(value, ignoreCase = true) }
+                ?: throw IllegalArgumentException("Invalid generationSource: $value")
+    }
+}