Redirect manual date edits on a version path to its original (#194)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/versions/integration_tests.rs

@@ -462,6 +462,74 @@ async fn folders_holding_only_hidden_versions_are_left_out_of_dirs() {
     );
 }
 
+#[actix_rt::test]
+async fn a_manual_date_on_a_version_path_lands_on_the_original() {
+    let (fx, original, v1, _v2) = seeded();
+    fx.exec(&format!(
+        "UPDATE image_exif SET date_taken = 1500000000, date_utc = 1500000000, \
+         date_taken_source = 'exif' WHERE content_hash = '{original}'"
+    ));
+    let app = awtest::init_service(
+        App::new()
+            .service(crate::handlers::image::set_image_date)
+            .service(crate::handlers::image::clear_image_date)
+            .app_data(fx.state.clone())
+            .app_data(fx.exif.clone()),
+    )
+    .await;
+    let post = |uri: &str, body: serde_json::Value| {
+        awtest::TestRequest::post()
+            .uri(uri)
+            .insert_header(("Authorization", format!("Bearer {}", Fx::token())))
+            .set_json(body)
+            .to_request()
+    };
+    let resp = awtest::call_service(
+        &app,
+        post(
+            "/image/exif/date",
+            serde_json::json!({"path": "2004/aiedits/scan.jpg.restored.png", "date_taken": 1_400_000_000}),
+        ),
+    )
+    .await;
+    assert_eq!(resp.status().as_u16(), 200);
+
+    assert_eq!(
+        fx.count(&format!(
+            "SELECT COUNT(*) AS n FROM image_exif WHERE content_hash = '{original}' \
+             AND date_taken_source = 'manual'"
+        )),
+        1,
+        "the original carries the manual date"
+    );
+    assert_eq!(
+        fx.count(&format!(
+            "SELECT COUNT(*) AS n FROM image_exif WHERE content_hash = '{v1}' \
+             AND date_taken_source = 'manual'"
+        )),
+        0,
+        "the version row is left to the metadata sync"
+    );
+
+    // The same redirect applies to clearing it.
+    let resp = awtest::call_service(
+        &app,
+        post(
+            "/image/exif/date/clear",
+            serde_json::json!({"path": "2004/aiedits/scan.jpg.restored.png"}),
+        ),
+    )
+    .await;
+    assert!(resp.status().is_success());
+    assert_eq!(
+        fx.count(&format!(
+            "SELECT COUNT(*) AS n FROM image_exif WHERE content_hash = '{original}' \
+             AND date_taken_source = 'manual'"
+        )),
+        0
+    );
+}
+
 #[actix_rt::test]
 async fn photos_without_versions_is_unchanged() {
     let fx = fx();