Add the ability to rate insights to curate training data

src/database/models.rs

@@ -86,6 +86,7 @@ pub struct InsertPhotoInsight {
     pub generated_at: i64,
     pub model_version: String,
     pub is_current: bool,
+    pub training_messages: Option<String>,
 }
 
 #[derive(Serialize, Queryable, Clone, Debug)]
@@ -97,6 +98,8 @@ pub struct PhotoInsight {
     pub generated_at: i64,
     pub model_version: String,
     pub is_current: bool,
+    pub training_messages: Option<String>,
+    pub approved: Option<bool>,
 }
 
 // --- Knowledge memory models ---