feat: Identity JSON sync mechanism

- storage.rs: add local_profile field, check disk for profile.jpg in save_identity_file_by_pool
- tmdb_api.rs: trigger JSON sync after TMDb probe
- identity_api.rs: upload_profile_image triggers JSON sync
- identity_binding.rs: bind/unbind/merge trigger JSON sync
- get_identity_json: replace DB fallback with Lazy Sync (generates JSON from DB if missing)
- Fixes missing/obsolete JSON files for all identity mutations

src/api/identity_api.rs

@@ -766,6 +766,11 @@ async fn upload_profile_image(
         (StatusCode::INTERNAL_SERVER_ERROR, Json(serde_json::json!({"success": false, "message": format!("Failed to write file: {}", e)})))
     })?;
 
+    // Sync identity JSON to reflect new profile image
+    let pool = state.db.pool().clone();
+    let uuid_clone = uuid_clean.clone();
+    let _ = crate::core::identity::storage::save_identity_file_by_pool(&pool, &uuid_clone).await;
+
     Ok(Json(ProfileImageResponse {
         success: true,
         identity_uuid: uuid_clean,
@@ -815,45 +820,24 @@ async fn get_identity_json(
         }
     }
 
-    // 2. Fallback: Generate JSON from DB
-    use crate::core::identity::storage::{IdentityFile, FileBinding};
-    let record = state.db.get_identity_by_uuid(&clean).await
-        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?
-        .ok_or(StatusCode::NOT_FOUND)?;
+    // 2. Lazy Sync: If file missing, generate from DB and save
+    if let Err(e) = crate::core::identity::storage::save_identity_file_by_pool(state.db.pool(), &clean).await {
+        tracing::warn!("[identity-json] Lazy sync failed for {}: {}", clean, e);
+        return Err(StatusCode::NOT_FOUND);
+    }
 
-    let id = record.id as i64;
-    let bindings: Vec<FileBinding> = {
-        let fd_table = crate::core::db::schema::table_name("face_detections");
-        let rows = sqlx::query_as::<_, (String, Vec<i32>, i64)>(
-            &format!("SELECT fd.file_uuid, COALESCE(array_agg(DISTINCT fd.trace_id) FILTER (WHERE fd.trace_id IS NOT NULL), '{{}}'::int[]), COUNT(*)::bigint                       FROM {} fd WHERE fd.identity_id = $1 GROUP BY fd.file_uuid ORDER BY fd.file_uuid", fd_table)
-        ).bind(id).fetch_all(state.db.pool()).await.unwrap_or_default();
-        rows.into_iter().map(|(fu, tids, cnt)| FileBinding {
-            file_uuid: fu, trace_ids: tids, face_count: cnt,
-        }).collect()
-    };
+    // 3. Read the newly generated file
+    let p = crate::core::identity::storage::identity_file_path(&clean);
+    if p.exists() {
+        let data = std::fs::read(&p).map_err(|_| StatusCode::NOT_FOUND)?;
+        return Ok((
+            StatusCode::OK,
+            [("content-type".to_string(), "application/json".to_string())],
+            data,
+        ));
+    }
 
-    let fmt_time = |dt: Option<chrono::DateTime<chrono::Utc>>| -> String {
-        dt.map(|d| d.to_rfc3339()).unwrap_or_else(|| chrono::Utc::now().to_rfc3339())
-    };
-
-    let file = IdentityFile {
-        version: 1,
-        identity_uuid: record.uuid.clone(),
-        name: record.name.clone(),
-        identity_type: record.identity_type.clone(),
-        source: record.source.clone(),
-        status: record.status.clone(),
-        tmdb_id: record.tmdb_id,
-        tmdb_profile: record.tmdb_profile.clone(),
-        metadata: record.metadata.clone(),
-        file_bindings: bindings,
-        created_at: fmt_time(record.created_at),
-        updated_at: fmt_time(record.updated_at),
-    };
-
-    let json = serde_json::to_string_pretty(&file).unwrap_or_default();
-    let bytes = json.into_bytes();
-    Ok((StatusCode::OK, [("content-type".to_string(), "application/json".to_string())], bytes))
+    Err(StatusCode::NOT_FOUND)
 }
 
 // ── Experiment: Identity Text Search ──────────────────────────

src/api/identity_binding.rs

@@ -115,10 +115,9 @@ pub async fn bind_identity(
     })?;
 
     let uuid_clean = identity_uuid.replace('-', "");
-    if let Ok(ref db) = PostgresDb::init().await {
-        if let Err(e) = crate::core::identity::storage::save_identity_file(db, &uuid_clean).await {
-            tracing::warn!("[bind] Failed to save identity file for {}: {}", uuid_clean, e);
-        }
+    // Sync identity JSON file
+    if let Err(e) = crate::core::identity::storage::save_identity_file_by_pool(&db, &uuid_clean).await {
+        tracing::warn!("[bind] Failed to sync identity file for {}: {}", uuid_clean, e);
     }
 
     Ok(Json(ApiResponse {
@@ -136,6 +135,7 @@ pub async fn unbind_identity(
     Json(req): Json<UnbindIdentityRequest>,
 ) -> Result<Json<ApiResponse<serde_json::Value>>, (StatusCode, Json<serde_json::Value>)> {
     let table = crate::core::db::schema::table_name("face_detections");
+    let id_table = crate::core::db::schema::table_name("identities");
 
     let db = sqlx::PgPool::connect(&crate::core::config::DATABASE_URL)
         .await
@@ -146,6 +146,22 @@ pub async fn unbind_identity(
             )
         })?;
 
+    // Find the identity_id before unbinding to sync it later
+    let identity_id: Option<i64> = sqlx::query_scalar(&format!(
+        "SELECT identity_id FROM {} WHERE file_uuid = $1 AND face_id = $2 AND identity_id IS NOT NULL",
+        table
+    ))
+    .bind(&req.file_uuid)
+    .bind(&req.face_id)
+    .fetch_optional(&db)
+    .await
+    .map_err(|e| {
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(serde_json::json!({"error": e.to_string()})),
+        )
+    })?;
+
     let result = sqlx::query(&format!(
         "UPDATE {} SET identity_id = NULL WHERE file_uuid = $1 AND face_id = $2",
         table
@@ -161,6 +177,24 @@ pub async fn unbind_identity(
         )
     })?;
 
+    // Sync the identity JSON if we found an identity
+    if let Some(id) = identity_id {
+        let uuid: Option<String> = sqlx::query_scalar(&format!(
+            "SELECT uuid::text FROM {} WHERE id = $1",
+            id_table
+        ))
+        .bind(id)
+        .fetch_optional(&db)
+        .await
+        .ok()
+        .flatten();
+        if let Some(identity_uuid) = uuid {
+            if let Err(e) = crate::core::identity::storage::save_identity_file_by_pool(&db, &identity_uuid).await {
+                tracing::warn!("[unbind] Failed to sync identity file for {}: {}", identity_uuid, e);
+            }
+        }
+    }
+
     Ok(Json(ApiResponse {
         success: true,
         message: format!("Unbound face {} from {}", req.face_id, req.file_uuid),
@@ -263,6 +297,18 @@ pub async fn merge_identities(
             })?;
     }
 
+    // Sync target identity JSON
+    let into_uuid_clean = req.into_uuid.replace('-', "");
+    if let Err(e) = crate::core::identity::storage::save_identity_file_by_pool(&db, &into_uuid_clean).await {
+        tracing::warn!("[merge] Failed to sync target identity file for {}: {}", into_uuid_clean, e);
+    }
+
+    // Delete source identity JSON if not keeping history
+    if !keep {
+        let from_uuid_clean = identity_uuid.replace('-', "");
+        let _ = crate::core::identity::storage::delete_identity_file(&from_uuid_clean);
+    }
+
     Ok(Json(ApiResponse {
         success: true,
         message: format!(

src/api/tmdb_api.rs

@@ -197,18 +197,41 @@ async fn tmdb_probe_handler(
     }
 
     match tmdb::probe::probe_from_cache(&state.db, &file_uuid).await {
-        Ok(result) => Ok(Json(TmdbProbeResponse {
-            success: true,
-            file_uuid,
-            tmdb_id: Some(result.tmdb_id),
-            movie_title: Some(result.title),
-            cast_count: Some(result.cast_count),
-            identities_created: Some(result.identities_created),
-            message: format!(
-                "Created/updated {} identities for movie ID {}",
-                result.identities_created, result.tmdb_id
-            ),
-        })),
+        Ok(result) => {
+            // Sync identity JSON files for newly created/updated identities
+            let pool = state.db.pool().clone();
+            let file_uuid_clone = file_uuid.clone();
+            tokio::spawn(async move {
+                // Query identities linked to this file
+                let fi_table = crate::core::db::schema::table_name("file_identities");
+                let query = format!(
+                    "SELECT i.uuid::text FROM {} fi JOIN {} i ON fi.identity_id = i.id WHERE fi.file_uuid = $1",
+                    fi_table, crate::core::db::schema::table_name("identities")
+                );
+                if let Ok(rows) = sqlx::query_scalar::<_, String>(&query)
+                    .bind(&file_uuid_clone)
+                    .fetch_all(&pool)
+                    .await
+                {
+                    for uuid in rows {
+                        let _ = crate::core::identity::storage::save_identity_file_by_pool(&pool, &uuid).await;
+                    }
+                }
+            });
+
+            Ok(Json(TmdbProbeResponse {
+                success: true,
+                file_uuid,
+                tmdb_id: Some(result.tmdb_id),
+                movie_title: Some(result.title),
+                cast_count: Some(result.cast_count),
+                identities_created: Some(result.identities_created),
+                message: format!(
+                    "Created/updated {} identities for movie ID {}",
+                    result.identities_created, result.tmdb_id
+                ),
+            }))
+        }
         Err(e) => {
             let msg = e.to_string();
             if msg.contains("not found") {

src/core/identity/storage.rs

@@ -18,6 +18,9 @@ pub struct IdentityFile {
     pub status: Option<String>,
     pub tmdb_id: Option<i32>,
     pub tmdb_profile: Option<String>,
+    /// Local profile image filename (e.g., "profile.jpg") if uploaded by user.
+    /// Overrides tmdb_profile if present.
+    pub local_profile: Option<String>,
     pub metadata: serde_json::Value,
     pub file_bindings: Vec<FileBinding>,
     pub created_at: String,
@@ -187,7 +190,7 @@ pub async fn save_identity_file_by_pool(pool: &sqlx::PgPool, uuid: &str) -> Resu
     let clean = uuid.replace('-', "");
     let record = sqlx::query_as::<_, crate::core::db::IdentityDetailRecord>(
         &format!(
-            "SELECT id, uuid::text, name, identity_type, source, status, metadata, reference_data, \
+            "SELECT id, uuid::text, COALESCE(real_name, actor_name, name) AS name, identity_type, source, status, metadata, reference_data, \
              NULL::real[] as voice_embedding, NULL::real[] as identity_embedding, \
              face_embedding::real[] as face_embedding, \
              tmdb_id, tmdb_profile, created_at::timestamptz as created_at, NULL::timestamptz as updated_at \
@@ -222,6 +225,14 @@ pub async fn save_identity_file_by_pool(pool: &sqlx::PgPool, uuid: &str) -> Resu
         })
         .collect();
 
+    // Check for local profile image
+    let profile_path = identity_dir(&clean).join("profile.jpg");
+    let local_profile = if profile_path.exists() {
+        Some("profile.jpg".to_string())
+    } else {
+        None
+    };
+
     let fmt_time = |dt: Option<chrono::DateTime<chrono::Utc>>| -> String {
         dt.map(|d| d.to_rfc3339())
             .unwrap_or_else(|| chrono::Utc::now().to_rfc3339())
@@ -236,6 +247,7 @@ pub async fn save_identity_file_by_pool(pool: &sqlx::PgPool, uuid: &str) -> Resu
         status: record.status,
         tmdb_id: record.tmdb_id,
         tmdb_profile: record.tmdb_profile,
+        local_profile,
         metadata: record.metadata,
         file_bindings,
         created_at: fmt_time(record.created_at),
@@ -349,6 +361,15 @@ pub async fn save_identity_file(db: &PostgresDb, uuid: &str) -> Result<()> {
         })
         .collect();
 
+    // Check for local profile image
+    let clean = uuid.replace('-', "");
+    let profile_path = identity_dir(&clean).join("profile.jpg");
+    let local_profile = if profile_path.exists() {
+        Some("profile.jpg".to_string())
+    } else {
+        None
+    };
+
     let fmt_time = |dt: Option<chrono::DateTime<chrono::Utc>>| -> String {
         dt.map(|d| d.to_rfc3339())
             .unwrap_or_else(|| chrono::Utc::now().to_rfc3339())
@@ -363,6 +384,7 @@ pub async fn save_identity_file(db: &PostgresDb, uuid: &str) -> Result<()> {
         status: record.status,
         tmdb_id: record.tmdb_id,
         tmdb_profile: record.tmdb_profile,
+        local_profile,
         metadata: record.metadata,
         file_bindings,
         created_at: fmt_time(record.created_at),