fix: remove trace_chunks from API + fix OCR frame calculation

- Removed trace_chunks field from PostgresStats struct
- Removed trace_chunks query from get_file_stats and get_ingestion_status
- Fixed OCR fetch_ocr_texts to compute frames from start_time*FPS
- Updated scan.rs to use separate count_nodes/count_edges functions

src/core/chunk/rule1_ingest.rs

@@ -14,7 +14,7 @@ pub async fn execute_rule1(db: &PostgresDb, file_uuid: &str, fps: f64) -> Result
     let pre_chunks_table = schema::table_name("pre_chunks");
 
     let asr_segments = fetch_asr_segments(pool, file_uuid, &pre_chunks_table, fps).await?;
-    let ocr_map = fetch_ocr_texts(pool, file_uuid, &pre_chunks_table).await?;
+    let ocr_map = fetch_ocr_texts(pool, file_uuid, &pre_chunks_table, fps).await?;
 
     let video = db
         .get_video_by_uuid(file_uuid)
@@ -161,14 +161,15 @@ async fn fetch_ocr_texts(
     pool: &PgPool,
     file_uuid: &str,
     table: &str,
+    fps: f64,
 ) -> Result<BTreeMap<i64, Vec<String>>> {
     let query = format!(
         r#"
         SELECT 
-            coordinate_index as frame, data
+            start_frame, start_time, end_time, data
         FROM {}
         WHERE file_uuid = $1 AND processor_type = 'ocr'
-        ORDER BY coordinate_index
+        ORDER BY start_frame
         "#,
         table
     );
@@ -177,9 +178,16 @@ async fn fetch_ocr_texts(
 
     let mut map: BTreeMap<i64, Vec<String>> = BTreeMap::new();
     for row in rows {
-        let frame: i64 = row.try_get("frame").unwrap_or(0);
+        let start_time: f64 = row.try_get("start_time").unwrap_or(0.0);
+        let end_time_raw: Option<f64> = row.try_get("end_time").ok();
         let data: Value = row.try_get("data").unwrap_or(Value::Null);
 
+        let start_frame = (start_time * fps) as i64;
+        let end_frame = end_time_raw
+            .filter(|t| *t > 0.0)
+            .map(|t| (t * fps) as i64)
+            .unwrap_or(start_frame + 1);
+
         let texts: Vec<String> = data
             .get("texts")
             .and_then(|t| t.as_array())
@@ -201,7 +209,16 @@ async fn fetch_ocr_texts(
             })
             .unwrap_or_default();
 
-        map.insert(frame, texts);
+        // Store texts for each frame in the range
+        for frame in start_frame..=end_frame {
+            map.entry(frame).or_default().extend(texts.clone());
+        }
+    }
+
+    // Deduplicate texts per frame
+    for (_frame, texts) in map.iter_mut() {
+        let mut seen = std::collections::HashSet::new();
+        texts.retain(|t| seen.insert(t.clone()));
     }
 
     Ok(map)