Add chunk reader impl

src/knowledge/data/tracker.py

@@ -3,7 +3,7 @@ import time
 import logging
 import os
 from .chunk import ChunkID, PositionType, PositionFileRange
-
+from typing import List
 
 class ChunkTracker:
     def __init__(self, root_dir: str):
@@ -61,11 +61,11 @@ class ChunkTracker:
         )
         self.conn.commit()
 
-    def get_position(self, chunk_id: ChunkID) -> (str, PositionType):
+    def get_position(self, chunk_id: ChunkID) -> List[(str, PositionType)]:
         self.cursor.execute(
             """
             SELECT pos, pos_type FROM chunks WHERE id = ?
         """,
             (str(chunk_id),),
         )
-        return self.cursor.fetchone()
+        return self.cursor.fetchmany()