diff --git a/data/KSP_data/log_book.xlsx b/data/KSP_data/log_book.xlsx
index 4b75950..91659d3 100644
Binary files a/data/KSP_data/log_book.xlsx and b/data/KSP_data/log_book.xlsx differ
diff --git a/src/KSP_tools/KSP_wiki/utils/__init__.py b/src/KSP_tools/KSP_wiki/utils/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/KSP_tools/KSP_wiki/utils/cal_rss_timestamp.py b/src/KSP_tools/KSP_wiki/utils/cal_rss_timestamp.py
new file mode 100644
index 0000000..6df5113
--- /dev/null
+++ b/src/KSP_tools/KSP_wiki/utils/cal_rss_timestamp.py
@@ -0,0 +1,25 @@
+import datetime
+
+t0 = datetime.datetime(year=1951, month=1, day=1, hour=0, minute=0, second=0, microsecond=0)
+now_time = 290263084.07456899
+
+def cal_rss_timestamp(offset_seconds) -> str:
+    """Calculate RSS timestamp given offset in seconds from 1951-01-01 00:00:00.
+
+    Args:
+        offset_seconds (int): Number of seconds offset from the base time.
+
+    Returns:
+        str: Formatted timestamp string in 'YYYY-MM-DD HH:MM:SS' format.
+    """
+    target_time = t0 + datetime.timedelta(seconds=offset_seconds)
+    return target_time.strftime("%Y-%m-%d %H:%M:%S")
+
+def cal_launch_date_via_met(met):
+    met_time = now_time - met
+    return cal_rss_timestamp(met_time)
+
+if __name__ == "__main__":
+    print(cal_launch_date_via_met(23083334.171755522))
+    print('done')
+
diff --git a/src/KSP_tools/KSP_wiki/utils/sync_to_overview.py b/src/KSP_tools/KSP_wiki/utils/sync_to_overview.py
new file mode 100644
index 0000000..ef13a36
--- /dev/null
+++ b/src/KSP_tools/KSP_wiki/utils/sync_to_overview.py
@@ -0,0 +1,700 @@
+"""Sync a given sheet's log entries into the Overview sheet in local_content_dir/log_book.xlsx.
+
+Usage (from project root):
+    python -m src.utils.sync_to_overview --sheet XH-01
+
+This script:
+- Loads local_content_dir/log_book.xlsx
+- Reads all rows from the specified sheet
+- Applies half-month attribution rules to start/end dates
+- Maps each entry onto the Overview sheet's timeline row for that sheet
+- Merges cells from the start half-month to the end half-month
+- Copies the fill color from the source log_name cell
+
+Assumptions about the workbook layout are documented in the docstrings below.
+"""
+
+from dataclasses import dataclass
+from datetime import date, datetime
+from pathlib import Path
+from typing import Any, Dict, List, Optional, Tuple
+import xml.etree.ElementTree as ET
+from openpyxl.workbook.workbook import Workbook as _Workbook
+
+from openpyxl import load_workbook
+from openpyxl.styles import PatternFill, Alignment
+from openpyxl.worksheet.worksheet import Worksheet
+from openpyxl.cell.cell import Cell, MergedCell
+
+# Paths and constants
+PROJECT_ROOT = Path(__file__).resolve().parents[2]
+LOG_BOOK_PATH = PROJECT_ROOT / "local_content_dir" / "log_book.xlsx"
+
+OVERVIEW_SHEET_NAME = "Overview"
+HEADER_ROW_INDEX = 1
+OVERVIEW_TIMELINE_START_COL = 3  # Column C by default (used for horizontal layout)
+
+
+@dataclass
+class LogEntry:
+    start: date
+    end: date
+    name: str
+    fill: Optional[PatternFill]
+
+
+def _normalize_header_name(value: Optional[str]) -> Optional[str]:
+    if not isinstance(value, str):
+        return None
+    v = value.strip().lower().replace("-", "_").replace(" ", "_")
+    return v or None
+
+
+def get_log_sheet_headers(ws: Worksheet, header_row: int = HEADER_ROW_INDEX) -> Dict[str, int]:
+    """Return a mapping from logical header names to 1-based column indices.
+
+    Required logical names: start_date, end_date, log_name
+    Optional: color
+    """
+    headers: Dict[str, int] = {}
+    for col in range(1, ws.max_column + 1):
+        raw = ws.cell(row=header_row, column=col).value
+        norm = _normalize_header_name(raw)
+        if not norm:
+            continue
+        if norm in ("start", "start_date", "start_time"):
+            headers["start_date"] = col
+        elif norm in ("end", "end_date", "end_time"):
+            headers["end_date"] = col
+        elif norm in ("log_name", "name", "title"):
+            headers["log_name"] = col
+        elif norm in ("color", "colour", "fill"):
+            headers["color"] = col
+    required = {"start_date", "end_date", "log_name"}
+    missing = required - headers.keys()
+    if missing:
+        raise ValueError(f"Missing required columns in sheet {ws.title!r}: {sorted(missing)}")
+    return headers
+
+
+def _parse_excel_date(value) -> Optional[date]:
+    """Best-effort parse of an Excel cell value into a date.
+
+    Supports datetime/date values and common string formats.
+    """
+    if value is None or value == "":
+        return None
+    if isinstance(value, datetime):
+        return value.date()
+    if isinstance(value, date):
+        return value
+    if isinstance(value, (int, float)):
+        # We avoid depending on workbook epoch; numeric dates are less expected here.
+        # Fallback: treat as ordinal days from 1900-01-01 if needed in future.
+        return None
+    if isinstance(value, str):
+        text = value.strip()
+        if not text:
+            return None
+        for fmt in ("%Y-%m-%d", "%Y/%m/%d", "%Y.%m.%d"):
+            try:
+                return datetime.strptime(text, fmt).date()
+            except ValueError:
+                continue
+    return None
+
+
+def _apply_tint(argb_hex: str, tint: float) -> str:
+    """Apply Excel tint to an ARGB hex string and return ARGB hex.
+
+    Tint formula (approximate):
+    - tint in (-1, 1)
+    - for each RGB channel (0-255):
+        if tint < 0: result = channel * (1.0 + tint)
+        else: result = channel + (255 - channel) * tint
+
+    argb_hex may be 8-char (ARGB) or 6-char (RGB) -- we assume ARGB and preserve alpha.
+    Returns uppercase 8-char ARGB string.
+    """
+    s = argb_hex.strip().lstrip("#")
+    if len(s) == 6:
+        alpha = 255
+        rgb = s
+    elif len(s) == 8:
+        alpha = int(s[0:2], 16)
+        rgb = s[2:]
+    else:
+        return argb_hex.upper()
+
+    try:
+        r = int(rgb[0:2], 16)
+        g = int(rgb[2:4], 16)
+        b = int(rgb[4:6], 16)
+    except Exception:
+        return argb_hex.upper()
+
+    def mix(channel: int, t: float) -> int:
+        if t < 0:
+            v = int(round(channel * (1.0 + t)))
+        else:
+            v = int(round(channel + (255 - channel) * t))
+        return max(0, min(255, v))
+
+    r2 = mix(r, tint)
+    g2 = mix(g, tint)
+    b2 = mix(b, tint)
+
+    return f"{alpha:02X}{r2:02X}{g2:02X}{b2:02X}"
+
+
+def _coerce_fill(value) -> Optional[PatternFill]:
+    """Convert various fill-like objects into a concrete solid PatternFill.
+
+    Rules:
+    - Only convert when the source is a solid fill (or has an explicit fgColor rgb/index/theme)
+    - Do not convert transparent/empty colors (alpha == '00' or missing) to avoid black blocks
+    - Support Color.rgb (ARGB or RGB), Color.indexed via openpyxl.styles.colors.COLOR_INDEX
+    - If we can't find a clear solid color, return None so caller won't apply a fill
+    """
+    if value is None:
+        return None
+
+    # If already a concrete PatternFill with solid type and a usable fgColor, try to reuse
+    try:
+        if isinstance(value, PatternFill):
+            ptype = getattr(value, "patternType", None) or getattr(value, "fill_type", None)
+            fg = getattr(value, "fgColor", None)
+            if ptype and str(ptype).lower() in ("solid", "darkgray", "gray125", "gray0625") and fg is not None:
+                rgb = getattr(fg, "rgb", None) or getattr(fg, "value", None)
+                if isinstance(rgb, str) and rgb.strip():
+                    hex_str = rgb.strip().lstrip("#")
+                    if len(hex_str) == 6:
+                        hex_str = "FF" + hex_str
+                    if len(hex_str) == 8 and not hex_str.startswith("00"):
+                        return PatternFill(fill_type="solid", fgColor=hex_str)
+            # otherwise fallthrough
+    except Exception:
+        pass
+
+    # If the object indicates no pattern (no fill), bail out to avoid assigning black
+    try:
+        ptype = getattr(value, "patternType", None) or getattr(value, "fill_type", None)
+        if ptype is None or str(ptype).strip().lower() in ("none", ""):
+            return None
+    except Exception:
+        pass
+
+    # Generic proxy/object with color attributes
+    fg = getattr(value, "fgColor", None) or getattr(value, "start_color", None)
+    rgb = None
+    if fg is not None:
+        rgb = getattr(fg, "rgb", None) or getattr(fg, "value", None)
+        # try indexed
+        if rgb is None:
+            idx = getattr(fg, "indexed", None)
+            if isinstance(idx, int):
+                try:
+                    from openpyxl.styles.colors import COLOR_INDEX
+
+                    hex_str = COLOR_INDEX[idx].lstrip("#")
+                    if len(hex_str) == 6:
+                        hex_str = "FF" + hex_str
+                    # avoid default/black colors
+                    if len(hex_str) == 8 and not hex_str.startswith("00") and hex_str.upper() != "FF000000":
+                        return PatternFill(fill_type="solid", fgColor=hex_str)
+                except Exception:
+                    pass
+        if isinstance(rgb, str) and rgb.strip():
+            hex_str = rgb.strip().lstrip("#")
+            # normalize to ARGB
+            if len(hex_str) == 6:
+                hex_str = "FF" + hex_str
+            if len(hex_str) == 8 and not hex_str.startswith("00") and hex_str.upper() != "FF000000":
+                # apply tint if present
+                tint = getattr(fg, "tint", None)
+                if tint is not None:
+                    try:
+                        hex_str = _apply_tint(hex_str, float(tint))
+                    except Exception:
+                        pass
+                return PatternFill(fill_type="solid", fgColor=hex_str)
+        # theme-based color (fg.theme)
+        theme_idx = getattr(fg, "theme", None)
+        if theme_idx is not None and _CURRENT_WB is not None:
+            try:
+                global _THEME_COLORS_CACHE
+                if _THEME_COLORS_CACHE is None:
+                    _THEME_COLORS_CACHE = _load_theme_colors(_CURRENT_WB)
+                if isinstance(theme_idx, int) and _THEME_COLORS_CACHE and theme_idx < len(_THEME_COLORS_CACHE):
+                    theme_hex = _THEME_COLORS_CACHE[theme_idx]
+                    if theme_hex and theme_hex.upper() != "FF000000":
+                        tint = getattr(fg, "tint", None)
+                        if tint is not None:
+                            try:
+                                theme_hex = _apply_tint(theme_hex, float(tint))
+                            except Exception:
+                                pass
+                        return PatternFill(fill_type="solid", fgColor=theme_hex)
+            except Exception:
+                pass
+
+    # As a last-ditch, the object itself might expose a string color
+    valstr = None
+    try:
+        if isinstance(value, str):
+            valstr = value
+        else:
+            valstr = str(value)
+    except Exception:
+        valstr = None
+    if isinstance(valstr, str):
+        s = valstr.strip().lstrip("#")
+        if len(s) == 6:
+            hex_str = "FF" + s
+            if hex_str.upper() != "FF000000":
+                return PatternFill(fill_type="solid", fgColor=hex_str)
+        if len(s) == 8 and not s.startswith("00") and s.upper() != "FF000000":
+            return PatternFill(fill_type="solid", fgColor=s)
+
+    return None
+
+
+def _load_theme_colors(wb: _Workbook) -> List[str]:
+    """Parse workbook.loaded_theme XML and return list of SRGB ARGB hex strings in scheme order.
+
+    This is best-effort. We look for <a:clrScheme> children and for each child prefer 'srgbClr' @val.
+    Returned hex strings are normalized to ARGB (8 chars, FF prefixed when needed).
+    """
+    colors: List[str] = []
+    try:
+        data = getattr(wb, "loaded_theme", None)
+        if data is None:
+            return colors
+        if isinstance(data, bytes):
+            data = data.decode("utf-8")
+        root = ET.fromstring(data)
+        # find any clrScheme element
+        clr = None
+        for node in root.findall('.//'):
+            tag = node.tag
+            if tag.endswith('clrScheme'):
+                clr = node
+                break
+        if clr is None:
+            return colors
+        for child in list(clr):
+            # find srgbClr descendant
+            srgb = child.find('.//')
+            val = None
+            # search for any element with 'srgbClr' in tag
+            for desc in child.iter():
+                if desc.tag.endswith('srgbClr'):
+                    val = desc.get('val')
+                    break
+            if val:
+                s = val.strip().lstrip('#')
+                if len(s) == 6:
+                    colors.append('FF' + s.upper())
+                elif len(s) == 8:
+                    colors.append(s.upper())
+                else:
+                    colors.append('')
+            else:
+                colors.append('')
+    except Exception:
+        return []
+    return colors
+
+
+def parse_log_row(ws: Worksheet, row_index: int, headers: Dict[str, int]) -> Optional[LogEntry]:
+    start_cell: Cell = ws.cell(row=row_index, column=headers["start_date"])
+    end_cell: Cell = ws.cell(row=row_index, column=headers["end_date"])
+    name_cell: Cell = ws.cell(row=row_index, column=headers["log_name"])
+
+    start = _parse_excel_date(start_cell.value)
+    end = _parse_excel_date(end_cell.value)
+    name_raw = name_cell.value
+    name = str(name_raw).strip() if name_raw is not None else ""
+
+    if start is None and end is None and not name:
+        return None
+
+    if start is None and end is not None:
+        start = end
+    if end is None and start is not None:
+        end = start
+    if start is None or end is None:
+        # Still not enough info
+        return None
+
+    fill: Optional[PatternFill] = None
+    if "color" in headers:
+        color_cell = ws.cell(row=row_index, column=headers["color"])
+        # Here we trust the user to put a proper hex like RRGGBB; minimal handling only.
+        if isinstance(color_cell.value, str) and color_cell.value.strip():
+            hex_str = color_cell.value.strip().lstrip("#")
+            if len(hex_str) in (6, 8):
+                # openpyxl expects ARGB; if RGB given, prepend FF
+                if len(hex_str) == 6:
+                    hex_str = "FF" + hex_str
+                fill = PatternFill(fill_type="solid", fgColor=hex_str)
+    if fill is None:
+        # annotate name_cell.fill access for static checkers
+        nf = name_cell.fill
+        fill = _coerce_fill(nf)
+        if nf is not None and fill is None:
+            # Debug info: collect fgColor attributes to help diagnose why coercion failed
+            try:
+                fg = getattr(nf, "fgColor", None) or getattr(nf, "start_color", None)
+                rgb = getattr(fg, "rgb", None) if fg is not None else None
+                theme = getattr(fg, "theme", None) if fg is not None else None
+                indexed = getattr(fg, "indexed", None) if fg is not None else None
+                tint = getattr(fg, "tint", None) if fg is not None else None
+                print(f"[sync_to_overview] sheet={ws.title!r} row={row_index} log_name={name!r} had fill proxy but coercion failed: fg.rgb={rgb!r} fg.theme={theme!r} fg.indexed={indexed!r} fg.tint={tint!r}")
+            except Exception:
+                print(f"[sync_to_overview] sheet={ws.title!r} row={row_index} log_name={name!r} had fill proxy but coercion failed (unable to inspect attributes)")
+
+    if not name:
+        # If there is no name but valid dates, we still can render a colored block; use empty string.
+        name = ""
+
+    return LogEntry(start=start, end=end, name=name, fill=fill)
+
+
+def _shift_month(d: date, delta: int) -> date:
+    """Shift date by delta months, keeping day when possible.
+
+    If the target month has fewer days, clamp to last day of month.
+    """
+    month = d.month - 1 + delta
+    year = d.year + month // 12
+    month = month % 12 + 1
+    # Clamp day to last day of target month
+    from calendar import monthrange
+
+    last_day = monthrange(year, month)[1]
+    day = min(d.day, last_day)
+    return date(year, month, day)
+
+
+def attribute_start_date(d: date) -> date:
+    """Map start date to its month start.
+
+    New rule: the start month is always the month of the original start date.
+    Returns a date representing the first day of that month (for timeline bucket comparisons).
+    """
+    return date(d.year, d.month, 1)
+
+
+def attribute_end_date(d: date) -> date:
+    """Map end date to its month start.
+
+    New rule: the end month is the month containing the actual end date (no half-month cutoff).
+    Returns the first day of that month for timeline comparisons.
+    """
+    return date(d.year, d.month, 1)
+
+
+# --- New: support both horizontal (timeline across a header row) and vertical (timeline down column A) ---
+
+def _detect_overview_orientation(ws: Worksheet, header_row: int = HEADER_ROW_INDEX, start_col: int = OVERVIEW_TIMELINE_START_COL) -> str:
+    """Detect whether Overview worksheet uses a horizontal timeline (dates across header_row)
+    or a vertical timeline (dates down column A). Returns 'horizontal' or 'vertical'.
+    Simple heuristic: if column A (starting at row 2) contains many dates -> vertical.
+    Otherwise if header_row contains many dates across columns starting at start_col -> horizontal.
+    Defaults to 'horizontal'.
+    """
+    # check column A for dates
+    col_a_date_count = 0
+    for r in range(header_row + 1, min(ws.max_row, header_row + 200) + 1):
+        v = ws.cell(row=r, column=1).value
+        if _parse_excel_date(v) is not None:
+            col_a_date_count += 1
+            if col_a_date_count >= 3:
+                return "vertical"
+    # check header row for dates across columns
+    row_date_count = 0
+    for c in range(start_col, min(ws.max_column, start_col + 200) + 1):
+        v = ws.cell(row=header_row, column=c).value
+        if _parse_excel_date(v) is not None:
+            row_date_count += 1
+            if row_date_count >= 3:
+                return "horizontal"
+    return "horizontal"
+
+
+def get_overview_timeline(
+    ws: Worksheet,
+    header_row: int = HEADER_ROW_INDEX,
+    start_col: int = OVERVIEW_TIMELINE_START_COL,
+) -> Tuple[str, List[Tuple[int, date]]]:
+    """Extract overview timeline.
+
+    Returns (orientation, timeline) where orientation is 'horizontal' or 'vertical'.
+    - horizontal: timeline is list of (col_index, date) scanning header_row from start_col rightwards
+    - vertical: timeline is list of (row_index, date) scanning column A from header_row+1 downward
+    """
+    orientation = _detect_overview_orientation(ws, header_row, start_col)
+    timeline: List[Tuple[int, date]] = []
+
+    if orientation == "horizontal":
+        empty_streak = 0
+        max_empty_streak = 10
+        for col in range(start_col, ws.max_column + 1):
+            cell = ws.cell(row=header_row, column=col)
+            d = _parse_excel_date(cell.value)
+            if d is None:
+                empty_streak += 1
+                if empty_streak >= max_empty_streak:
+                    break
+                continue
+            empty_streak = 0
+            timeline.append((col, d))
+        timeline.sort(key=lambda x: x[1])
+        return orientation, timeline
+
+    # vertical
+    empty_streak = 0
+    max_empty_streak = 10
+    for row in range(header_row + 1, ws.max_row + 1):
+        cell = ws.cell(row=row, column=1)
+        d = _parse_excel_date(cell.value)
+        if d is None:
+            empty_streak += 1
+            if empty_streak >= max_empty_streak:
+                break
+            continue
+        empty_streak = 0
+        timeline.append((row, d))
+    timeline.sort(key=lambda x: x[1])
+    return orientation, timeline
+
+
+def find_bucket_span(
+    timeline: List[Tuple[int, date]], start_attr: date, end_attr: date
+) -> Optional[Tuple[int, int]]:
+    if not timeline:
+        return None
+    # Match by year-month to be robust when timeline cells are mid-month
+    start_key = (start_attr.year, start_attr.month)
+    end_key = (end_attr.year, end_attr.month)
+
+    ym_list: List[Tuple[int, Tuple[int, int]]] = [(idx, (d.year, d.month)) for idx, d in timeline]
+
+    first_pos = None
+    for i, (_, ym) in enumerate(ym_list):
+        if ym >= start_key:
+            first_pos = i
+            break
+    if first_pos is None:
+        return None
+
+    last_pos = None
+    for i in range(len(ym_list) - 1, -1, -1):
+        if ym_list[i][1] <= end_key:
+            last_pos = i
+            break
+    if last_pos is None or last_pos < first_pos:
+        return None
+
+    return timeline[first_pos][0], timeline[last_pos][0]
+
+
+def _has_merged_intersection(ws: Worksheet, min_row: int, max_row: int, min_col: int, max_col: int) -> bool:
+    """Return True if any existing merged cell range intersects the supplied rectangle."""
+    for merged in ws.merged_cells.ranges:
+        if merged.min_row <= max_row and merged.max_row >= min_row and merged.min_col <= max_col and merged.max_col >= min_col:
+            return True
+    return False
+
+
+def _unmerge_intersecting_ranges(ws: Worksheet, min_row: int, max_row: int, min_col: int, max_col: int) -> None:
+    to_unmerge = []
+    for merged in list(ws.merged_cells.ranges):
+        if merged.min_row <= max_row and merged.max_row >= min_row and merged.min_col <= max_col and merged.max_col >= min_col:
+            to_unmerge.append(merged)
+    for merged in to_unmerge:
+        ws.unmerge_cells(str(merged.coord))
+
+
+def clear_overview_range(ws: Worksheet, sheet_pos: int, indices: List[int], orientation: str) -> None:
+    """Clear the destination cells for a given sheet in the Overview.
+
+    - For horizontal orientation: sheet_pos is a row index, indices are column indices.
+    - For vertical orientation: sheet_pos is a column index, indices are row indices.
+    """
+    if not indices:
+        return
+    min_idx = min(indices)
+    max_idx = max(indices)
+
+    if orientation == "horizontal":
+        min_col = min_idx
+        max_col = max_idx
+        row_index = sheet_pos
+        # Unmerge any merged cells intersecting this row & column range
+        _unmerge_intersecting_ranges(ws, row_index, row_index, min_col, max_col)
+        for col in range(min_col, max_col + 1):
+            cell: Any = ws.cell(row=row_index, column=col)
+            cell.value = None
+            cell.fill = PatternFill()  # clear fill
+    else:
+        # vertical orientation: we clear a column at sheet_pos between min_idx..max_idx rows
+        col_index = sheet_pos
+        min_row = min_idx
+        max_row = max_idx
+        _unmerge_intersecting_ranges(ws, min_row, max_row, col_index, col_index)
+        for row in range(min_row, max_row + 1):
+            cell: Any = ws.cell(row=row, column=col_index)
+            cell.value = None
+            cell.fill = PatternFill()  # clear fill
+
+
+def apply_log_to_overview(
+    ws: Worksheet,
+    sheet_pos: int,
+    start_idx: int,
+    end_idx: int,
+    log_name: str,
+    fill: Optional[PatternFill],
+    orientation: str,
+) -> None:
+    """Apply a log entry to the Overview.
+
+    - For horizontal: sheet_pos is row, start_idx/end_idx are columns -> merge horizontally (single row).
+    - For vertical: sheet_pos is column, start_idx/end_idx are rows -> merge vertically (single column).
+    """
+    if start_idx > end_idx:
+        start_idx, end_idx = end_idx, start_idx
+
+    # Conflict resolution: if any existing merged range intersects our intended target, shrink the start index forward
+    if orientation == "horizontal":
+        # target rectangle: (sheet_pos, start_idx..end_idx)
+        while start_idx <= end_idx and _has_merged_intersection(ws, sheet_pos, sheet_pos, start_idx, end_idx):
+            start_idx += 1
+        if start_idx > end_idx:
+            return
+        if start_idx == end_idx:
+            cell: Any = ws.cell(row=sheet_pos, column=start_idx)
+        else:
+            ws.merge_cells(start_row=sheet_pos, start_column=start_idx, end_row=sheet_pos, end_column=end_idx)
+            cell: Any = ws.cell(row=sheet_pos, column=start_idx)
+    else:
+        # vertical: target rectangle: (start_idx..end_idx, sheet_pos)
+        while start_idx <= end_idx and _has_merged_intersection(ws, start_idx, end_idx, sheet_pos, sheet_pos):
+            start_idx += 1
+        if start_idx > end_idx:
+            return
+        if start_idx == end_idx:
+            cell: Any = ws.cell(row=start_idx, column=sheet_pos)
+        else:
+            ws.merge_cells(start_row=start_idx, start_column=sheet_pos, end_row=end_idx, end_column=sheet_pos)
+            cell: Any = ws.cell(row=start_idx, column=sheet_pos)
+
+    # Defensive: if we somehow got a MergedCell (read-only), find the actual top-left cell
+    try:
+        if isinstance(cell, MergedCell):
+            for merged in ws.merged_cells.ranges:
+                if merged.min_row <= cell.row <= merged.max_row and merged.min_col <= cell.column <= merged.max_col:
+                    cell = ws.cell(row=merged.min_row, column=merged.min_col)
+                    break
+    except Exception:
+        # ignore and continue
+        pass
+
+    cell.value = log_name
+    cell.alignment = Alignment(horizontal="center", vertical="center")  # type: ignore[attr-defined]
+    if fill is not None:
+        cell.fill = fill  # type: ignore[attr-defined]
+
+
+def _find_overview_position_for_sheet(ws: Worksheet, sheet_name: str, orientation: str) -> Optional[int]:
+    """Find where the sheet's overview cells live.
+
+    - horizontal orientation: sheet names are expected in column A (like before) -> return the row index
+    - vertical orientation: sheet names are expected in header row (ROW 1) across columns -> return the column index
+    """
+    if orientation == "horizontal":
+        for row in range(2, ws.max_row + 1):  # assume header in row 1
+            val = ws.cell(row=row, column=1).value
+            if isinstance(val, str) and val.strip() == sheet_name:
+                return row
+        return None
+    # vertical
+    for col in range(2, ws.max_column + 1):  # assume column A is timeline, so sheet headers start at B
+        val = ws.cell(row=HEADER_ROW_INDEX, column=col).value
+        if isinstance(val, str) and val.strip() == sheet_name:
+            return col
+    return None
+
+
+def sync_to_overview(source_sheet_name: str, workbook_path: Optional[Path] = None) -> None:
+    global _CURRENT_WB, _THEME_COLORS_CACHE
+    wb_path = Path(workbook_path) if workbook_path is not None else LOG_BOOK_PATH
+    if not wb_path.exists():
+        raise FileNotFoundError(f"Workbook not found: {wb_path}")
+
+    wb = load_workbook(wb_path, data_only=False)
+    _CURRENT_WB = wb
+    _THEME_COLORS_CACHE = None
+
+    if source_sheet_name not in wb.sheetnames:
+        raise KeyError(f"Sheet not found: {source_sheet_name}")
+    if OVERVIEW_SHEET_NAME not in wb.sheetnames:
+        raise KeyError(f"Overview sheet not found: {OVERVIEW_SHEET_NAME}")
+
+    ws_src = wb[source_sheet_name]
+    ws_ov = wb[OVERVIEW_SHEET_NAME]
+
+    orientation, timeline = get_overview_timeline(ws_ov)
+    timeline_indices = [idx for idx, _ in timeline]
+
+    overview_pos = _find_overview_position_for_sheet(ws_ov, source_sheet_name, orientation)
+    if overview_pos is None:
+        if orientation == "horizontal":
+            raise ValueError(f"Could not find row in Overview with name {source_sheet_name!r} in column A")
+        else:
+            raise ValueError(f"Could not find column in Overview with header {source_sheet_name!r} in row 1")
+
+    headers = get_log_sheet_headers(ws_src)
+
+    # Clear the destination range first
+    clear_overview_range(ws_ov, overview_pos, timeline_indices, orientation)
+
+    for row in range(HEADER_ROW_INDEX + 1, ws_src.max_row + 1):
+        entry = parse_log_row(ws_src, row, headers)
+        if entry is None:
+            continue
+        start_attr = attribute_start_date(entry.start)
+        end_attr = attribute_end_date(entry.end)
+        if end_attr < start_attr:
+            end_attr = start_attr
+        span = find_bucket_span(timeline, start_attr, end_attr)
+        if span is None:
+            continue
+        idx_start, idx_end = span
+        apply_log_to_overview(ws_ov, overview_pos, idx_start, idx_end, entry.name, entry.fill, orientation)
+
+    wb.save(wb_path)
+    # clear global
+    _CURRENT_WB = None
+    _THEME_COLORS_CACHE = None
+
+
+def main(sheet: str, workbook: Optional[str] = None) -> None:
+    """Run sync_to_overview with explicit parameters.
+
+    Args:
+        sheet: source sheet name (e.g. 'XH-01')
+        workbook: path to workbook file; if None, use default LOG_BOOK_PATH
+    """
+    wb_path = Path(workbook) if workbook is not None else LOG_BOOK_PATH
+    sync_to_overview(sheet, wb_path)
+
+
+if __name__ == "__main__":
+    # Configure these values here and call main directly.
+    # Edit these lines to change which sheet / workbook are processed.
+    sheet_name = "XH-01"
+    workbook_path = str(LOG_BOOK_PATH)
+    main(sheet_name, workbook_path)
diff --git a/src/KSP_tools/KSP_wiki/utils/upload_log_book_to_db.py b/src/KSP_tools/KSP_wiki/utils/upload_log_book_to_db.py
new file mode 100644
index 0000000..c53f5ab
--- /dev/null
+++ b/src/KSP_tools/KSP_wiki/utils/upload_log_book_to_db.py
@@ -0,0 +1,151 @@
+"""Upload specified sheets from local_content_dir/log_book.xlsx into the database table public.log_book.
+
+Behavior:
+- Reads each sheet in the provided list (currently set to ["XH-01"]).
+- Uses the first row of each sheet as column names; expected to match the existing DB table columns.
+- Appends a fixed column "vehicle" with the value equal to the sheet name.
+- Skips fully-empty rows.
+
+Notes:
+- The script uses src.pg_handler.db_handler.PgHandler and src.config.load_config.project_config for DB connection info.
+- This script performs INSERTs; run with a backup of the workbook if needed.
+"""
+import os
+
+from pathlib import Path
+from typing import List, Optional
+from datetime import datetime, date
+from openpyxl import load_workbook
+
+from src.PostgresSQL.db_handler import PgHandler
+from src.config.load_config import project_config
+
+PROJECT_ROOT = Path(__file__).resolve().parents[4]
+KSP_DATA_DIR = os.path.join(PROJECT_ROOT, "data", "KSP_data")
+
+def _parse_excel_date(value):
+    if value is None or value == "":
+        return None
+    if isinstance(value, datetime):
+        return value.date()
+    if isinstance(value, date):
+        return value
+    if isinstance(value, (int, float)):
+        return None
+    if isinstance(value, str):
+        text = value.strip()
+        if not text:
+            return None
+        for fmt in ("%Y-%m-%d", "%Y/%m/%d", "%Y.%m.%d", "%Y-%m-%d %H:%M:%S"):
+            try:
+                return datetime.strptime(text, fmt).date()
+            except Exception:
+                continue
+    return None
+
+
+def _read_sheet(ws):
+    """Read header row and data rows from worksheet. Returns (headers, rows).
+
+    headers: list of header names (strings)
+    rows: list of lists of cell values (preserving original types where possible)
+    """
+    headers: List[str] = []
+    for col in range(1, ws.max_column + 1):
+        raw = ws.cell(row=1, column=col).value
+        if raw is None:
+            headers.append("")
+        else:
+            headers.append(str(raw).strip())
+
+    data_rows: List[List[Optional[object]]] = []
+    for r in range(2, ws.max_row + 1):
+        row_vals: List[Optional[object]] = []
+        non_empty = False
+        for c in range(1, ws.max_column + 1):
+            v = ws.cell(row=r, column=c).value
+            if isinstance(v, (datetime, date)):
+                v = _parse_excel_date(v)
+            elif isinstance(v, str):
+                v = v.strip()
+            if v not in (None, ""):
+                non_empty = True
+            row_vals.append(v)
+        if non_empty:
+            data_rows.append(row_vals)
+    return headers, data_rows
+
+
+def upload_sheets(sheet_names: List[str], workbook_path) -> None:
+    wb_path = Path(workbook_path)
+    if not wb_path.exists():
+        raise FileNotFoundError(f"Workbook not found: {wb_path}")
+
+    wb = load_workbook(wb_path, data_only=True)
+
+    # DB connection info from project_config
+    host = project_config.get('db_host')
+    port = project_config.get('db_port')
+    user = project_config.get('db_user')
+    password = project_config.get('db_password')
+    database = project_config.get('db_name')
+
+    with PgHandler(host=host, port=port, user=user, password=password or None, database=database) as pg:
+        conn = pg._get_conn()
+        cur = conn.cursor()
+
+        for sheet_name in sheet_names:
+            if sheet_name not in wb.sheetnames:
+                print(f"Sheet not found in workbook: {sheet_name}, skipping")
+                continue
+            ws = wb[sheet_name]
+            headers, rows = _read_sheet(ws)
+            if not headers or not any(h for h in headers):
+                print(f"No headers found in sheet {sheet_name}, skipping")
+                continue
+
+            # Prepare columns: take non-empty header names only
+            cols = [h for h in headers if h]
+            if not cols:
+                print(f"Sheet {sheet_name} has no named columns, skipping")
+                continue
+
+            # final columns include vehicle
+            db_columns = cols + ["vehicle"]
+            col_sql = ", ".join([f'"{c}"' for c in db_columns])
+            placeholders = ", ".join(["%s"] * len(db_columns))
+            insert_sql = f'INSERT INTO "public"."log_book" ({col_sql}) VALUES ({placeholders})'
+
+            # Build values: map each row (which may contain more columns than headers length) to cols
+            values_to_insert = []
+            for row_vals in rows:
+                # Truncate/extend row_vals to match number of defined headers
+                mapped = []
+                for i, col_name in enumerate(cols):
+                    if i < len(row_vals):
+                        mapped.append(row_vals[i])
+                    else:
+                        mapped.append(None)
+                mapped.append(sheet_name)  # vehicle
+                values_to_insert.append(tuple(mapped))
+
+            if not values_to_insert:
+                print(f"No data rows for sheet {sheet_name}, skipping insert")
+                continue
+
+            try:
+                cur.executemany(insert_sql, values_to_insert)
+                conn.commit()
+                print(f"Inserted {len(values_to_insert)} rows from sheet {sheet_name} into log_book")
+            except Exception as e:
+                conn.rollback()
+                print(f"Failed to insert rows from sheet {sheet_name}: {e}")
+
+        cur.close()
+
+
+if __name__ == "__main__":
+    WORKBOOK_PATH = os.path.join(KSP_DATA_DIR, 'log_book.xlsx')
+    SHEETS_TO_UPLOAD: List[str] = ["XH-01"]
+    upload_sheets(SHEETS_TO_UPLOAD, WORKBOOK_PATH)
+
diff --git a/src/KSP_tools/KSP_wiki/vessel_log/Stellaria_history.py b/src/KSP_tools/KSP_wiki/vessel_log/Stellaria_history.py
new file mode 100644
index 0000000..4a92a30
--- /dev/null
+++ b/src/KSP_tools/KSP_wiki/vessel_log/Stellaria_history.py
@@ -0,0 +1,101 @@
+operating_history_raw = """
+2050-09-15 First module delivered to LEO via Vulture Shuttle
+2053-02-02 Assembly Halted
+
+2053-05-11 Reconfiguring to ST-01 Stellaria
+    Only fitted with the Light Speed Engine. Other systems are still Xihe standard. Awaiting further upgrades.
+2054-4-28 Reconfiguration Complete
+
+2054-05-12 Begin Trial Run in Earth Orbit, testing all systems
+2054-08-22 Trial Run complete, all systems perform as expected. Including multiple run to GEO and Lunar Orbit before returning to LEO.
+
+2054-09-07 Begin Deep Space Test Mission
+    Uncrewed mission to Earth-Sun Lagrange Point 2 to test long-duration operations
+2054-11-28 Test Mission Complete, all systems nominal. Returning to LEO.
+
+2055-12-01 Start maintenance
+2055-02-28 Maintenance complete, all systems operational, ready for commissioning.
+
+2055-03-20 Picking up crew for Inner Solar System Exploration Mission 1
+2055-03-22 Earth Departure for Mecury
+    Use standard trajectory with 127km/s of departure burn
+2055-04-17 Mercury Arrival
+    First crewed mission to Mercury
+    2055-04-18 Orbital Survey of Mercury begins
+    2055-06-14 First Crewed Surface Landing on Mercury
+    2055-06-15 EVA operations commence
+    2055-06-30 Surface operations complete, returning to orbit
+2055-08-15 Departure from Mercury for Venus
+    Use standard trajectory with 85km/s of departure burn
+2055-10-01 Venus Arrival
+    First crewed mission to Venus, no crewed landing attempted due to extreme surface conditions. Probe deployment only.
+    2055-10-02 Orbital Survey of Venus begins
+    2055-10-10 Landing Probe Deployment
+    2055-11-10 Begin Upper Atmosphere Survey via Callisto MPV
+2056-03-24 Departure from Venus for Earth
+    Use standard trajectory with 75km/s of departure burn
+2056-04-12 Earth Arrival
+
+2056-04-15 Start maintenance
+2056-06-01 Maintenance complete.
+
+2056-06-02 Picking up crew for Mars One Construction Mission 2
+2056-06-04 Picking up Mars One construction cargo
+2056-06-06 Earth Departure for Mars
+    Use standard trajectory with 126km/s of departure burn
+2056-07-01 Mars Arrival, First crewed mission to Mars using Stellaria
+    2056-07-03 Crew descend to Martian Surface, Continuing the construction of Mars One Base
+    2056-07-20 Heavy Cargo Delivery to Surface via Callisto MPV
+    2056-09-17 Mars One Construction Mission 3 Crew Arrival via XH-01, joining Stellaria crew. First Crew Handover on Mars.
+    2056-10-12 Mars One Construction Mission 2 Crew ascend to Stellaria
+2056-10-15 Departure from Mars for Earth
+    Use Fast Return trajectory with 212km/s of departure burn
+2056-11-03 Earth Arrival
+
+2056-11-04 Start maintenance
+2056-12-10 Maintenance complete.
+
+2056-12-15 Start preparations for Europa Outpost Construction Mission 1
+2056-12-20 Europa Outpost Construction Package arrival via Qingtian Cargo Shuttle
+2056-12-31 Picking up crew for Europa Outpost Construction Mission 1 
+2057-01-02 Earth Departure for Europa
+    Use standard trajectory with 165km/s of departure burn
+
+    
+
+
+"""
+
+
+
+
+operating_history = [
+    {
+        "log_name": "Construction",
+        "start_time": "2050-09-15",
+        "end_time": "2053-02-02",
+        "mission_detail": "Construction",
+        "sub_log":
+            [
+                "2050-09-15 First module delivered to LEO via Vulture Shuttle",
+                "2053-02-02 Assembly Halted",
+            ]
+    },
+    {
+        "log_name": "Reconfiguring to ST-01 Stellaria",
+        "start_time": "2053-05-11",
+        "end_time": "2054-4-28",
+        "mission_detail": "Only fitted with the Light Speed Engine. Other systems are still Xihe standard. Awaiting further upgrades.",
+        "sub_log":[]
+    },
+    {
+        'log_name': "Trial Run",
+        'start_time': "2054-05-12",
+        'end_time': "2054-8-22",
+        'mission_detail': "Trial Run before commissioning",
+        'sub_log': [
+            "2054-05-12 Begin Trial Run in Earth Orbit, testing all systems",
+            "2054-08-22 Trial Run complete, all systems perform as expected. Including multiple run to GEO and Lunar Orbit before returning to LEO.",
+        ]
+    }
+]
\ No newline at end of file
diff --git a/src/KSP_tools/KSP_wiki/vessel_log/xihe_agent.py b/src/KSP_tools/KSP_wiki/vessel_log/xihe_agent.py
new file mode 100644
index 0000000..50402cc
--- /dev/null
+++ b/src/KSP_tools/KSP_wiki/vessel_log/xihe_agent.py
@@ -0,0 +1,323 @@
+import json
+import os
+import openai
+
+from pathlib import Path
+from openai import OpenAI
+from langchain_core.messages import HumanMessage, AIMessage
+
+from src.config.load_config import LLM, project_config
+
+PROJECT_ROOT = Path(__file__).parent.parent.parent.parent
+DATA_PATH = os.path.join(PROJECT_ROOT, "data")
+
+xihe_main_wiki_path = os.path.join(PROJECT_ROOT,"local_content_dir","Exploration_Motherships","Xihe", "Xihe.md")
+with open(xihe_main_wiki_path, "r", encoding="utf-8") as f:
+    XIHE_MAIN_WIKI_CONTEXT = f.read()
+
+with open(os.path.join(PROJECT_ROOT, "local_content_dir", "meta_info.md"), "r", encoding="utf-8") as f:
+    meta_info_content = f.read()
+
+user_input = """
+请根据给到你的材料，撰写羲和号（XH-01）的维基百科条目内容。
+你需要撰写多个章节，涵盖羲和号的各个方面。每个章节应当非常详细，内容应当丰富且专业。
+你应当根据提供的信息进行适度的扩展，但不可以脱离提供的信息范围。
+你应当保持中立的语气，避免使用主观评价性的语言。
+运行历史应当作为单独章节列出，时间线应当尽可能完整。
+
+以下是羲和号的运行历史：
+[
+{
+    "log_name": "Construction",
+    "start_time": "2050-03-15",
+    "end_time": "2052-05-31",
+    "mission_detail": "Xihe XH-01 Construction",
+    "sub_log": 
+    [
+        "2050-03-15 First module delivered to LEO via Vulture Shuttle",
+        "2052-02-06 Assembly completed in LEO",
+    ]
+},
+{
+    "log_name": "Trial Run in Earth Orbit",
+    "start_time": "2052-06-01",
+    "end_time": "2052-11-30",
+    "mission_detail": "Trial Run before commissioning",
+    "sub_log": []
+},
+{
+    "log_name": "Deep Space Test Mission",
+    "start_time": "2053-01-12",
+    "end_time": "2053-12-18",
+    "mission_detail": "Long term uncrewed test",
+    "sub_log":
+    [
+        "2053-01-12 Deep Space Test Mission, uncrewed mission to Earth-Sun L2 point to test deep space operations",
+        "2053-12-18 Back to LEO"
+    ]
+},
+{
+    "log_name": "Maintenance and upgrades",
+    "start_time": "2054-01-07",
+    "end_time": "2054-06-28",
+    "mission_detail": "",
+    "sub_log": []
+},
+{
+    "log_name": "Mars Mission Outbound",
+    "start_time": "2054-07-10",
+    "end_time": "2054-08-21",
+    "mission_detail": "Earth-Mars transfer using standard trajectory with 102km/s of departure burn",
+    "sub_log": []
+},
+{
+    "log_name": "Mars Mission Demo at Mars",
+    "start_time": "2054-08-21",
+    "end_time": "2055-01-10",
+    "mission_detail": "Uncrewed, Deliver the first Mars-One base construction equipment package to Mars orbit.",
+    "sub_log": 
+    [
+        "2054-08-21 Mars Orbit Arrival, deploy equipment package to Mars surface via lander",
+        "2055-01-10 Mars Departure, return to Earth"
+    ]
+},
+{
+    "log_name": "Mars Mission Demo Return to Earth",
+    "start_time": "2055-01-10",
+    "end_time": "2055-02-28",
+    "mission_detail": "Mars-Earth transfer using standard trajectory with 97km/s of departure burn",
+    "sub_log": []
+},
+{
+    "log_name": "Maintenance and upgrades",
+    "start_time": "2055-03-01",
+    "end_time": "2055-05-14",
+    "mission_detail": "",
+    "sub_log": []
+},
+{
+    "log_name": "Mars One base construction mission 1 outbound",
+    "start_time": "2055-06-15",
+    "end_time": "2055-07-30",
+    "mission_detail": "Earth-Mars transfer using standard trajectory with 115km/s of departure burn",
+    "sub_log": [
+        "2055-06-15 Picking up crew for Mars One base construction mission 1",
+        "2055-06-18 Earth Departure for Mars"
+        ]
+},
+{
+    "log_name": "Mars One base construction mission 1 at Mars",
+    "start_time": "2055-07-30",
+    "end_time": "2056-02-07",
+    "mission_detail": "First Mars One base construction mission, begin base construction",
+    "sub_log": [
+        "2055-07-30 Mars Arrival, begin base construction",
+        "2056-02-07 Mars Departure, return to Earth"
+        ]
+},
+{
+    "log_name": "Mars One base construction mission 1 Return to Earth",
+    "start_time": "2056-02-07",
+    "end_time": "2056-03-18",
+    "mission_detail": "Mars-Earth transfer using standard trajectory with 122km/s of departure burn",
+    "sub_log": [
+        "2056-02-07 Mars Departure, return to Earth. First to use quick return trajectory.",
+        "2056-03-18 Earth Arrival, crew return"
+        ]
+},
+{
+    "log_name": "Maintenance and upgrades",
+    "start_time": "2056-03-19",
+    "end_time": "2056-06-20",
+    "mission_detail": "",
+    "sub_log": []
+},
+{
+    "log_name": "Mars One base construction mission 3 outbound",
+    "start_time": "2056-07-30",
+    "end_time": "2056-09-15",
+    "mission_detail": "Earth-Mars transfer using standard trajectory with 95km/s of departure burn",
+    "sub_log": [] 
+},
+{
+    "log_name": "Mars One base construction mission 3 at Mars",
+    "start_time": "2056-09-15",
+    "end_time": "2057-02-12",
+    "mission_detail": "Third Mars One base construction. First crew hand-off on Mars(with Mars One base construction 2).",
+    "sub_log": [
+        "2056-09-15 Mars Arrival, continue base construction",
+        "2057-02-12 Mars Departure, return to Earth."
+    ]
+},
+{
+    "log_name": "Mars One base construction mission 3 Return to Earth",
+    "start_time": "2057-02-12",
+    "end_time": "2057-03-25",
+    "mission_detail": "Mars-Earth transfer using standard trajectory with 122km/s of departure burn",
+    "sub_log": [
+        "2057-02-12 Mars Departure, return to Earth.",
+        "2057-03-25 Earth Arrival, crew return."
+    ]
+},
+{
+    "log_name": "Maintenance",
+    "start_time": "2057-03-26",
+    "end_time": "2057-04-25",
+    "mission_detail": "",
+    "sub_log": []
+},
+{
+    "log_name": "Mars Expedition 2 Outbound",
+    "start_time": "2057-05-05",
+    "end_time": "2057-06-22",
+    "mission_detail": "Earth-Mars transfer using standard trajectory with 110km/s of departure burn",
+    "sub_log": [
+        "2057-05-05 Picking up crew for Mars Expedition 2",
+        "2057-05-09 Earth Departure for Mars"
+    ]
+},
+{
+    "log_name": "Mars Expedition 2 at Mars",
+    "start_time": "2057-06-22",
+    "end_time": "2058-04-18",
+    "mission_detail": "Second long term Mars Expedition, first mission to Mars One base after the construction is completed. First mission involving space tourism to Mars.",
+    "sub_log": [
+        "2057-06-22 Mars Arrival",
+        "2057-06-25 Mars EDL and surface operations begin",
+        "2058-04-10 Begin Mars Departure preparations",
+        "2058-04-18 Mars Departure for Earth"
+        ]
+},
+{
+    "log_name": "Mars Expedition 2 Return to Earth",
+    "start_time": "2058-04-18",
+    "end_time": "2058-05-20",
+    "mission_detail": "Mars-Earth transfer using standard trajectory with 115km/s of departure burn",
+    "sub_log": [
+        "2058-04-18 Mars Departure for Earth",
+        "2058-05-20 Earth Arrival, crew return"
+        ]
+},
+{
+    "log_name": "Maintenance",
+    "start_time": "2058-05-21",
+    "end_time": "2058-06-18",
+    "mission_detail": "",
+    "sub_log": []
+},
+{
+    "log_name": "Europa Expedition 1 Outbound",
+    "start_time": "2058-07-10",
+    "end_time": "2058-09-25",
+    "mission_detail": "Earth-Jupiter transfer using standard trajectory with 160km/s of departure burn",
+    "sub_log": [
+        "2058-07-10 Picking up crew for Europa Expedition 1",
+        "2058-07-12 Earth Departure for Jupiter system",
+        "2058-09-25 Europa Arrival"
+    ]
+},
+{
+    "log_name": "Europa Expedition 1 at Jupiter System",
+    "start_time": "2058-09-25",
+    "end_time": "2059-07-10",
+    "mission_detail": "First standard crew expedition to Europa Outpost to begin exploration of Jupiter system Long term surface operation at Europa Outpost, followed by exploration of IO and Ganymede",
+    "sub_log": [
+        "2058-09-25 Europa Arrival",
+        "2058-09-27 Europa descend, begin surface operation at Europa Outpost",
+        "2058-12-15 Europa ascend, begin Jupiter system exploration",
+        "2058-12-20 Begin IO exploration",
+        "2059-01-20 Return to Europa Outpost",
+        "2059-06-20 Begin Europa Outpost departure preparations",
+        "2059-06-25 Europa Expedition 1 crew ascend from Europa Outpost",
+        "2059-07-05 begin Ganymede exploration",
+        "2059-07-10 Departure for Earth, upgrade planned."
+    ]
+},
+{
+    "log_name": "Europa Expedition 1 Return to Earth",
+    "start_time": "2059-07-10",
+    "end_time": "2059-11-15",
+    "mission_detail": "Uses standard trajectory with 112km/s of departure burn Parked to Star Port",
+    "sub_log": [
+        "2059-07-10 Departure for Earth.",
+        "2059-11-15 Earth Arrival, Park to Star Port."
+    ]
+},
+{
+    "log_name": "Maintenance and upgrade",
+    "start_time": "2059-11-16",
+    "end_time": "2060-02-19",
+    "mission_detail": "Greenhouse upgrade to support long term deep space missions",
+    "sub_log": []
+},
+{
+    "log_name": "Europa Expedition 3 Outbound",
+    "start_time": "2060-02-20",
+    "end_time": "2060-05-10",
+    "mission_detail": "Uses standard trajectory with 163km/s of departure burn",
+    "sub_log": [
+        "2060-02-20 Picking up Europa Expedition 3 crew, On its way to explore Jupiter systems before sending crew to Europa Outpost",
+    ]
+},
+]
+"""
+
+prompt = f"""
+# 角色
+你是一个航天领域的维基百科撰写专家，精通航天技术和科学。你熟悉维基百科的格式和风格指南，能够撰写符合其标准的内容。
+
+# 任务
+你的任务是根据用户提供的信息，帮助用户以维基百科的风格撰写相关的航天器维基百科条目内容。
+
+# 注意点
+- 交给你的信息是一个架空世界观下的航天器信息，请基于这些信息撰写内容，避免引入现实世界的航天器知识。
+- 你需要根据提供的信息撰写多个章节，涵盖航天器的各个方面。
+- 你应当根据提供的信息进行适度的扩展，但不可以脱离提供的信息范围。
+- 你应当保持中立的语气，避免使用主观评价性的语言。
+- 你应当以markdown格式输出内容，内容应当仿照维基百科的模式，分成多个章节。
+- 不要提及航天器的研发机构或国家背景，这是一个架空世界观下的航天器，因此不涉及现实世界的国家或组织，也不要编造一个组织或者机构。
+- 对于载具的名称，如果能够在提供的信息中找到对应的中文名称，应当尽量使用中文名称，否则应当遵循原材料中的名称。
+- 避免出现外部链接，所有的超链接都应当是指向维基百科内部的其他条目。
+
+# 输出格式要求
+你应当以markdown格式输出内容，内容应当仿照维基百科的模式，分成多个章节。为了保证维基百科的风格，最开始一定要有一个简介段落。
+你的输出一定要保持中立的语气，避免使用主观评价性的语言。
+你应当根据提供的信息进行适度的扩展，但不可以脱离提供的信息范围。
+
+你应当以中文来完成撰写
+如果涉及到其他的航天器，你应当以超链接的形式链接到对应的航天器维基百科条目。维基百科的根目录url为: /home。给到你的材料当中已经包含了其他航天器的一些url信息，你可以参考这些信息来创建超链接。如果没有相关信息，你可以自己指定一个。比如说，如果提到“奥丁一号”，你可以创建一个链接指向“/home/Odin-1”: [奥丁一号](/home/Odin-1)
+
+以下是提供给你的材料:
+{XIHE_MAIN_WIKI_CONTEXT}
+
+以下是一些通用材料:
+{meta_info_content}
+
+以下是你的任务需求：
+{user_input}
+"""
+
+message_list = [
+    {
+        "role": "user",
+        "content": prompt
+    }
+]
+
+# llm_resp = LLM.stream(prompt)
+# full_content = ''
+# for chunk in llm_resp:
+#     print(chunk.content, end="", flush=True)
+#     full_content += chunk.content
+
+llm_resp = LLM.invoke(prompt)
+full_content = llm_resp.content
+
+message_list.append(
+    {
+        "role": "assistant",
+        "content": full_content
+    }
+)
+
+print('done')
diff --git a/src/OneNote_tool/__init__.py b/src/OneNote_tool/__init__.py
new file mode 100644
index 0000000..e7b1c3b
--- /dev/null
+++ b/src/OneNote_tool/__init__.py
@@ -0,0 +1,28 @@
+"""OneNote_tool package exports utilities to load OneNote documents.
+
+Currently exposes load_OneNote_document.
+"""
+import importlib
+
+try:
+    # dynamic import to get reference if available
+    _mod = importlib.import_module(".onenote", __package__)
+    _load_OneNote_document = getattr(_mod, "load_OneNote_document", None)
+except Exception:
+    _load_OneNote_document = None
+
+
+def load_OneNote_document(*args, **kwargs):
+    """Load OneNote document (wrapper).
+
+    Uses an eagerly-imported function when available (helps some IDEs/statics); otherwise
+    imports the implementation lazily to avoid import-time side effects.
+    """
+    if _load_OneNote_document is not None:
+        return _load_OneNote_document(*args, **kwargs)
+    mod = importlib.import_module(".onenote", __package__)
+    func = getattr(mod, "load_OneNote_document")
+    return func(*args, **kwargs)
+
+
+__all__ = ["load_OneNote_document"]
diff --git a/src/OneNote_tool/onenote.py b/src/OneNote_tool/onenote.py
new file mode 100644
index 0000000..c30b729
--- /dev/null
+++ b/src/OneNote_tool/onenote.py
@@ -0,0 +1,323 @@
+"""OneNote loader utilities.
+
+Provides load_OneNote_document which supports:
+- Loading from local exported OneNote HTML directory or single .html/.mht file.
+- Loading via Microsoft Graph API when provided with "graph" source and an access token.
+
+This implementation keeps dependencies optional: only `requests` is required for Graph fetches.
+"""
+from typing import Optional, Dict, Any, List
+import pathlib
+import mimetypes
+import logging
+import re
+import email
+from email import policy
+
+logger = logging.getLogger(__name__)
+
+# Minimal contract:
+# - input: path_or_source (str), options (dict)
+# - output: Dict with keys: "type" ("local"|"graph"), "pages": list of {"title","content","id","lastModified"}
+
+
+def _read_local_html_file(path: str) -> str:
+    with open(path, "rb") as f:
+        data = f.read()
+    # try to decode utf-8, fallback to latin1
+    for enc in ("utf-8", "utf-8-sig", "latin-1"):
+        try:
+            return data.decode(enc)
+        except Exception:
+            continue
+    return data.decode("latin-1", errors="ignore")
+
+
+def _decode_part_payload(part) -> str:
+    # part is an email.message.Message
+    raw = part.get_payload(decode=True)
+    if raw is None:
+        return ""
+    ch = part.get_content_charset()
+    if ch:
+        try:
+            return raw.decode(ch, errors="replace")
+        except Exception:
+            pass
+    for enc in ("utf-8", "utf-8-sig", "latin-1"):
+        try:
+            return raw.decode(enc)
+        except Exception:
+            continue
+    return raw.decode("latin-1", errors="replace")
+
+
+def _extract_title_from_html(html: str) -> str:
+    m = re.search(r"<title>(.*?)</title>", html, flags=re.I | re.S)
+    if m:
+        return m.group(1).strip()
+    # try to find first h1/h2 as fallback
+    m2 = re.search(r"<h1[^>]*>(.*?)</h1>", html, flags=re.I | re.S)
+    if m2:
+        return re.sub(r"\s+", " ", re.sub(r"<[^>]+>", "", m2.group(1))).strip()
+    return "(untitled)"
+
+
+def _split_html_into_pages(html: str) -> List[str]:
+    """Heuristic split of a single HTML that may contain multiple OneNote pages.
+
+    Tries multiple strategies in order and returns the first that yields more than one fragment:
+    1. class-based: <div class="...page...">
+    2. id-based: <div id="Page...">
+    3. header-based: split by repeated <h1> (or <h2>) elements which often mark page titles
+
+    Returns list of HTML fragments (each a standalone-ish HTML string) or single-element list if heuristics fail.
+    """
+    # 1) class-based (existing)
+    pattern_class = re.compile(r"<div[^>]+class=[\"'][^\"']*(?:page|onenote-page|onenotepage|oneNotePage)[^\"']*[\"'][^>]*>", flags=re.I)
+    matches = list(pattern_class.finditer(html))
+    if len(matches) > 1:
+        parts = []
+        head_match = re.search(r"<head>(.*?)</head>", html, flags=re.I | re.S)
+        head_html = head_match.group(0) if head_match else ""
+        for i, m in enumerate(matches):
+            start = m.start()
+            end = matches[i + 1].start() if i + 1 < len(matches) else len(html)
+            body_fragment = html[start:end]
+            frag = "<html>" + head_html + "<body>" + body_fragment + "</body></html>"
+            parts.append(frag)
+        return parts
+
+    # 2) id-based: look for divs whose id begins with 'Page' or 'page' or 'id="P' common OneNote exports
+    pattern_id = re.compile(r"<div[^>]+id=[\"']?(?:Page|page|P)_[^\s\"'>]*[\"']?[^>]*>", flags=re.I)
+    matches_id = list(pattern_id.finditer(html))
+    if len(matches_id) > 1:
+        parts = []
+        head_match = re.search(r"<head>(.*?)</head>", html, flags=re.I | re.S)
+        head_html = head_match.group(0) if head_match else ""
+        for i, m in enumerate(matches_id):
+            start = m.start()
+            end = matches_id[i + 1].start() if i + 1 < len(matches_id) else len(html)
+            body_fragment = html[start:end]
+            frag = "<html>" + head_html + "<body>" + body_fragment + "</body></html>"
+            parts.append(frag)
+        return parts
+
+    # 3) header-based: split by repeated <h1> (or <h2>) which often denote page titles in OneNote exports
+    h1_matches = list(re.finditer(r"<h1[^>]*>", html, flags=re.I))
+    if len(h1_matches) > 1:
+        parts = []
+        head_match = re.search(r"<head>(.*?)</head>", html, flags=re.I | re.S)
+        head_html = head_match.group(0) if head_match else ""
+        for i, m in enumerate(h1_matches):
+            start = m.start()
+            end = h1_matches[i + 1].start() if i + 1 < len(h1_matches) else len(html)
+            body_fragment = html[start:end]
+            frag = "<html>" + head_html + "<body>" + body_fragment + "</body></html>"
+            parts.append(frag)
+        return parts
+
+    # fallback: no multi-page split detected
+    return [html]
+
+
+def _parse_mht_bytes(data: bytes) -> List[Dict[str, Any]]:
+    """Parse MHT/MHTML bytes and return a list of pages (dicts with id/title/content).
+
+    Strategy:
+    - Use email.parser.BytesParser to parse the multipart MHT.
+    - For each part with content-type text/html, treat as one page.
+    - If there's only a single html part but it seems to contain multiple pages, try heuristic splitting.
+    """
+    msg = email.parser.BytesParser(policy=policy.default).parsebytes(data)
+    html_parts: List[str] = []
+    ids: List[str] = []
+    # walk parts
+    if msg.is_multipart():
+        for part in msg.walk():
+            ctype = part.get_content_type()
+            if ctype == "text/html":
+                try:
+                    html = _decode_part_payload(part)
+                except Exception:
+                    html = _decode_part_payload(part)
+                html_parts.append(html)
+                # try to get a useful id from Content-Location or Content-ID
+                loc = part.get("Content-Location") or part.get("Content-ID") or ""
+                ids.append(loc)
+    else:
+        # not multipart: try parse as text/html
+        ctype = msg.get_content_type()
+        if ctype == "text/html":
+            html_parts.append(_decode_part_payload(msg))
+            ids.append("")
+    pages: List[Dict[str, Any]] = []
+    if len(html_parts) == 0:
+        return pages
+    if len(html_parts) == 1:
+        # maybe this single html contains multiple OneNote pages; try splitting heuristically
+        subpages = _split_html_into_pages(html_parts[0])
+        if len(subpages) > 1:
+            for idx, sp in enumerate(subpages):
+                title = _extract_title_from_html(sp) or f"page_{idx}"
+                pages.append({"id": ids[0] or f"mht_part_{idx}", "title": title, "content": sp})
+            return pages
+        # otherwise single page
+        title = _extract_title_from_html(html_parts[0])
+        pages.append({"id": ids[0] or "mht_root", "title": title, "content": html_parts[0]})
+        return pages
+    # multiple html parts -> each is a page
+    for idx, html in enumerate(html_parts):
+        title = _extract_title_from_html(html)
+        pages.append({"id": ids[idx] if idx < len(ids) else f"mht_part_{idx}", "title": title, "content": html})
+    return pages
+
+
+def load_OneNote_document(path_or_source: str, options: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+    """Load OneNote content.
+
+    If `path_or_source` is a local filesystem path to a directory or file, load local HTML/MHT exports.
+    If `path_or_source` == "graph", options must contain `access_token` and either `notebook_id` or `site_id` + `notebook_id`.
+
+    Returns a dict with parsed pages.
+    """
+    options = options or {}
+
+    p = pathlib.Path(path_or_source)
+    if path_or_source == "graph":
+        # fetch via Microsoft Graph
+        token = options.get("access_token")
+        if not token:
+            raise ValueError("Graph source requires 'access_token' in options")
+        notebook_id = options.get("notebook_id")
+        # simple graph pagination for pages
+        import requests
+
+        headers = {"Authorization": f"Bearer {token}"}
+        pages = []
+        if not notebook_id:
+            # try current user's notebooks
+            url = "https://graph.microsoft.com/v1.0/me/onenote/notebooks"
+        else:
+            url = f"https://graph.microsoft.com/v1.0/me/onenote/notebooks/{notebook_id}/sections"
+        resp = requests.get(url, headers=headers)
+        resp.raise_for_status()
+        data = resp.json()
+        # This is a thin implementation: collect pages by iterating sections then pages
+        sections = data.get("value", [])
+        for sec in sections:
+            sec_id = sec.get("id")
+            sec_title = sec.get("displayName")
+            # list pages in section
+            pages_url = f"https://graph.microsoft.com/v1.0/me/onenote/sections/{sec_id}/pages"
+            r2 = requests.get(pages_url, headers=headers)
+            if r2.status_code != 200:
+                continue
+            for pjson in r2.json().get("value", []):
+                content_url = pjson.get("contentUrl")
+                page_id = pjson.get("id")
+                title = pjson.get("title")
+                last_modified = pjson.get("lastModifiedDateTime")
+                # fetch content (HTML)
+                try:
+                    c_resp = requests.get(content_url, headers=headers)
+                    c_resp.raise_for_status()
+                    content = c_resp.text
+                except Exception as e:
+                    logger.exception("Failed to fetch OneNote page content: %s", e)
+                    content = ""
+                pages.append({"id": page_id, "title": title, "content": content, "lastModified": last_modified, "section": sec_title})
+        return {"type": "graph", "pages": pages}
+
+    # Local path handling
+    if not p.exists():
+        raise FileNotFoundError(f"Path not found: {path_or_source}")
+
+    pages = []
+    if p.is_file():
+        mtype, _ = mimetypes.guess_type(p.as_posix())
+        if (p.suffix.lower() == ".mht") or (mtype == "message/rfc822") or (p.suffix.lower() == ".mhtml"):
+            # .mht parsing: try to parse parts and split into pages
+            with open(p.as_posix(), "rb") as f:
+                data = f.read()
+            try:
+                mht_pages = _parse_mht_bytes(data)
+                if mht_pages:
+                    pages.extend(mht_pages)
+                else:
+                    # fallback to raw read
+                    content = _read_local_html_file(p.as_posix())
+                    pages.append({"id": p.name, "title": p.stem, "content": content})
+            except Exception as e:
+                logger.exception("Failed to parse MHT file %s: %s", p, e)
+                content = _read_local_html_file(p.as_posix())
+                pages.append({"id": p.name, "title": p.stem, "content": content})
+        else:
+            content = _read_local_html_file(p.as_posix())
+            pages.append({"id": p.name, "title": p.stem, "content": content})
+        return {"type": "local", "pages": pages}
+
+    # directory: search for .html/.htm/.mht/.mhtml
+    exts = (".html", ".htm", ".mht", ".mhtml")
+    for fp in sorted(p.rglob("*")):
+        if fp.suffix.lower() in exts and fp.is_file():
+            try:
+                if fp.suffix.lower() in (".mht", ".mhtml"):
+                    with open(fp.as_posix(), "rb") as f:
+                        data = f.read()
+                    mht_pages = _parse_mht_bytes(data)
+                    if mht_pages:
+                        for mp in mht_pages:
+                            pages.append({"id": fp.as_posix() + "::" + mp.get("id", ""), "title": mp.get("title"), "content": mp.get("content")})
+                        continue
+                    # else fall through to raw read
+                content = _read_local_html_file(fp.as_posix())
+            except Exception as e:
+                logger.exception("Failed to read file %s: %s", fp, e)
+                continue
+            # try to extract title from HTML
+            m = re.search(r"<title>(.*?)</title>", content, flags=re.I | re.S)
+            title = m.group(1).strip() if m else fp.stem
+            pages.append({"id": fp.as_posix(), "title": title, "content": content})
+    return {"type": "local", "pages": pages}
+
+
+def _safe_filename(s: str) -> str:
+    # create a filesystem-safe filename
+    s = s or "page"
+    s = re.sub(r"[\\\/\:\*\?\"<>\|]", "_", s)
+    s = re.sub(r"\s+", "_", s)
+    return s[:180]
+
+
+def _maybe_debug_save(pages: List[Dict[str, Any]], options: Optional[Dict[str, Any]] = None) -> None:
+    """If options contains 'debug_save_dir', save each page's HTML into that directory for inspection."""
+    options = options or {}
+    outdir = options.get("debug_save_dir")
+    if not outdir:
+        return
+    outp = pathlib.Path(outdir)
+    try:
+        outp.mkdir(parents=True, exist_ok=True)
+    except Exception:
+        return
+    for idx, page in enumerate(pages):
+        try:
+            title = page.get("title") or f"page_{idx}"
+            fname = f"{idx:03d}_{_safe_filename(title)}.html"
+            fp = outp.joinpath(fname)
+            with open(fp, "w", encoding="utf-8") as f:
+                f.write(page.get("content") or "")
+        except Exception:
+            logger.exception("Failed to write debug page %s", page.get("id"))
+
+
+# Small smoke-run when executed directly
+if __name__ == "__main__":
+    import sys
+    if len(sys.argv) > 1:
+        path = sys.argv[1]
+    else:
+        path = r'C:\Users\zhouyr9\Documents\2025.mht'
+    out = load_OneNote_document(path)
+    print(f"Found {len(out['pages'])} pages")