fix: type mismatch BIGINT->INT4 and FLOAT8->FLOAT4 in traces and faces endpoints

- trace_agent_api: CAST trace_id, frame_number to int; CAST confidence to float4
- identities: CAST frame_number to int; CAST confidence to float4
- Fixes 500 errors on /traces, /trace/:id/faces, /faces/candidates

src/api/identities.rs

@@ -328,7 +328,7 @@ async fn list_face_candidates(
 
     let rows = if let Some(file_uuid) = &query.file_uuid {
         let sql = format!(
-            "SELECT id, face_id, file_uuid, frame_number, confidence, 
+            "SELECT id, face_id, file_uuid, frame_number::int, confidence::float4, 
                     jsonb_build_object('x', x, 'y', y, 'width', width, 'height', height) as bbox,
                     NULL::jsonb as attributes 
              FROM {} 
@@ -366,7 +366,7 @@ async fn list_face_candidates(
         }
     } else {
         let sql = format!(
-            "SELECT id, face_id, file_uuid, frame_number, confidence, 
+            "SELECT id, face_id, file_uuid, frame_number::int, confidence::float4, 
                     jsonb_build_object('x', x, 'y', y, 'width', width, 'height', height) as bbox,
                     NULL::jsonb as attributes 
              FROM {}