diff --git a/pdelfin/assemblepipeline.py b/pdelfin/assemblepipeline.py
index 84c80ee..3d9c94d 100644
--- a/pdelfin/assemblepipeline.py
+++ b/pdelfin/assemblepipeline.py
@@ -7,6 +7,54 @@ import argparse
 from tqdm import tqdm
 from concurrent.futures import ProcessPoolExecutor, as_completed
 
+class DatabaseManager:
+    def __init__(self, db_path):
+        self.db_path = db_path
+        self.conn = sqlite3.connect(self.db_path)
+        self.cursor = self.conn.cursor()
+        self._initialize_tables()
+
+    def _initialize_tables(self):
+        self.cursor.execute("""
+            CREATE TABLE IF NOT EXISTS index_table (
+                custom_id TEXT,
+                s3_path TEXT,
+                start_index BIGINT,
+                end_index BIGINT
+            )
+        """)
+        self.cursor.execute("""
+            CREATE TABLE IF NOT EXISTS processed_files (
+                s3_path TEXT PRIMARY KEY,
+                etag TEXT
+            )
+        """)
+        self.conn.commit()
+
+    def is_file_processed(self, s3_path, etag):
+        self.cursor.execute("SELECT etag FROM processed_files WHERE s3_path = ?", (s3_path,))
+        result = self.cursor.fetchone()
+        return result is not None and result[0] == etag
+
+    def add_index_entries(self, index_entries):
+        if index_entries:
+            self.cursor.executemany("""
+                INSERT INTO index_table (custom_id, s3_path, start_index, end_index)
+                VALUES (?, ?, ?, ?)
+            """, index_entries)
+            self.conn.commit()
+
+    def update_processed_file(self, s3_path, etag):
+        self.cursor.execute("""
+            INSERT INTO processed_files (s3_path, etag)
+            VALUES (?, ?)
+            ON CONFLICT(s3_path) DO UPDATE SET etag=excluded.etag
+        """, (s3_path, etag))
+        self.conn.commit()
+
+    def close(self):
+        self.conn.close()
+
 def build_index(s3_path):
     # Hash the s3_path to get a cache key
     cache_key = hashlib.sha256(s3_path.encode('utf-8')).hexdigest()
@@ -14,25 +62,9 @@ def build_index(s3_path):
     os.makedirs(home_cache_dir, exist_ok=True)
     db_path = os.path.join(home_cache_dir, 'index.db')
 
-    # Connect to sqlite and create tables if not exist
+    # Initialize the database manager
     print("Building page index at", db_path)
-    conn = sqlite3.connect(db_path)
-    cursor = conn.cursor()
-    cursor.execute("""
-        CREATE TABLE IF NOT EXISTS index_table (
-            custom_id TEXT,
-            s3_path TEXT,
-            start_index BIGINT,
-            end_index BIGINT
-        )
-    """)
-    cursor.execute("""
-        CREATE TABLE IF NOT EXISTS processed_files (
-            s3_path TEXT PRIMARY KEY,
-            etag TEXT
-        )
-    """)
-    conn.commit()
+    db_manager = DatabaseManager(db_path)
 
     s3 = boto3.client('s3')
     bucket, prefix = parse_s3_path(s3_path)
@@ -42,42 +74,34 @@ def build_index(s3_path):
 
     if not files:
         print("No .json or .jsonl files found in the specified S3 path.")
+        db_manager.close()
         return
 
     # Prepare a list of files that need processing
-    files_to_process = []
-    for key, etag in files.items():
-        cursor.execute("SELECT etag FROM processed_files WHERE s3_path = ?", (key,))
-        db_result = cursor.fetchone()
-        if db_result and db_result[0] == etag:
-            # File has already been processed with the same ETag
-            pass  # Skip
-        else:
-            files_to_process.append((key, etag))
+    files_to_process = [
+        (key, etag) for key, etag in files.items()
+        if not db_manager.is_file_processed(key, etag)
+    ]
 
     if not files_to_process:
         print("All files are up to date. No processing needed.")
+        db_manager.close()
         return
 
     # Use ProcessPoolExecutor to process files with tqdm progress bar
     with ProcessPoolExecutor() as executor:
-        futures = [executor.submit(process_file, bucket, key, etag) for key, etag in files_to_process]
+        futures = [
+            executor.submit(process_file, bucket, key, etag) 
+            for key, etag in files_to_process
+        ]
         for future in tqdm(as_completed(futures), total=len(futures), desc="Processing files"):
             s3_path, key, etag, index_entries = future.result()
             if index_entries:
-                cursor.executemany("""
-                    INSERT INTO index_table (custom_id, s3_path, start_index, end_index)
-                    VALUES (?, ?, ?, ?)
-                """, index_entries)
+                db_manager.add_index_entries(index_entries)
             # Update the processed_files table
-            cursor.execute("""
-                INSERT INTO processed_files (s3_path, etag)
-                VALUES (?, ?)
-                ON CONFLICT(s3_path) DO UPDATE SET etag=excluded.etag
-            """, (key, etag))
-            conn.commit()
+            db_manager.update_processed_file(key, etag)
 
-    conn.close()
+    db_manager.close()
 
 def parse_s3_path(s3_path):
     if not s3_path.startswith('s3://'):
@@ -139,5 +163,3 @@ if __name__ == '__main__':
 
     # Step one, build an index of all the pages that were processed
     build_index(args.s3_path)
-
-