fix: revert native excel parsing

surfsense_backend/app/utils/office_parsers.py

@@ -1,72 +0,0 @@
-"""Native parsers for Office file formats."""
-
-import asyncio
-import logging
-import threading
-import time
-from pathlib import Path
-
-logger = logging.getLogger(__name__)
-
-EXCEL_EXTENSIONS = (".xlsx",)
-
-
-def _parse_excel_sync(file_path: str) -> str:
-    """Parse an .xlsx file into markdown tables (synchronous)."""
-    from openpyxl import load_workbook
-
-    wb = load_workbook(file_path, read_only=True, data_only=True)
-    markdown_parts: list[str] = []
-
-    for sheet_name in wb.sheetnames:
-        ws = wb[sheet_name]
-        rows = list(ws.iter_rows(values_only=True))
-        non_empty_rows = [r for r in rows if any(c is not None for c in r)]
-        if not non_empty_rows:
-            continue
-
-        markdown_parts.append(f"## {sheet_name}\n")
-        max_cols = max(len(row) for row in non_empty_rows)
-
-        header = non_empty_rows[0]
-        hdr = [str(c if c is not None else "") for c in header]
-        hdr.extend([""] * (max_cols - len(hdr)))
-        markdown_parts.append("| " + " | ".join(hdr) + " |")
-        markdown_parts.append("| " + " | ".join("---" for _ in range(max_cols)) + " |")
-
-        for row in non_empty_rows[1:]:
-            cells = [str(c if c is not None else "") for c in row]
-            cells.extend([""] * (max_cols - len(cells)))
-            markdown_parts.append("| " + " | ".join(cells) + " |")
-
-        markdown_parts.append("")
-
-    wb.close()
-    return "\n".join(markdown_parts)
-
-
-async def parse_excel_to_markdown(file_path: str, filename: str = "") -> str:
-    """Parse an .xlsx file into markdown tables (async wrapper).
-
-    Raises ``ValueError`` if no data is found in the workbook.
-    """
-    t0 = time.monotonic()
-    logger.info(
-        "[excel-parse] START file=%s thread=%s",
-        filename,
-        threading.current_thread().name,
-    )
-
-    result = await asyncio.to_thread(_parse_excel_sync, file_path)
-
-    logger.info(
-        "[excel-parse] END file=%s elapsed=%.2fs",
-        filename,
-        time.monotonic() - t0,
-    )
-
-    if not result.strip():
-        raise ValueError(f"No data found in Excel file: {filename or file_path}")
-
-    title = f"# {filename}\n\n" if filename else ""
-    return title + result