# Personendatei Importer Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Add `tools/import-normalizer/persons_tree.py` — a CLI tool that reads `import/Personendatei 2.xlsx` and writes `out/canonical-persons-tree.json` with 163 normalized person records, SPOUSE_OF/PARENT_OF relationship edges, and an `unresolved[]` list for manual review.

**Architecture:** Two-pass approach: pass 1 parses all rows into person dicts and builds a name-lookup index; pass 2 resolves `verheiratet mit` (SPOUSE_OF) and parses `Bemerkung` for parent/child patterns (PARENT_OF). Reuses `ingest.read_sheet()`, `ingest.build_header_map()`, `dates.parse_date()`, and `persons._strip_accents` from the existing normalizer. No backend required.

**Tech Stack:** Python 3.12, openpyxl (already in `.venv`), pytest (already in `.venv`), `dates.py`/`ingest.py`/`config.py`/`persons.py` from `tools/import-normalizer/`.

---

## Context you need before starting

**Run environment:**
```bash
cd tools/import-normalizer
source .venv/bin/activate   # or: .venv/bin/python / .venv/bin/pytest directly
```

**Key existing modules (read these before coding):**
- `config.py` — `PERSON_WORKBOOK`, `PERSON_SHEET`, `PERSON_HEADER_MAP`, `OUT_DIR`
- `ingest.py` — `read_sheet(path, sheet_name) -> list[list[str]]` and `build_header_map(header_row, field_map, required)`
- `dates.py` — `parse_date(raw: str) -> ParsedDate` with `.iso` (ISO string or None) and `.precision`
- `persons.py` — `_strip_accents(s)` (diacritic normalization)

**How ingest works:** `read_sheet()` opens the workbook with openpyxl and converts every cell to a string via `_cell_to_str()`. Date-formatted cells become ISO strings (`"1920-09-20"`). Cells stored as plain numbers (like the date serials in this file) become numeric strings (`"7568"`). All values arrive in `persons_tree.py` as strings.

**PERSON_HEADER_MAP** (already in `config.py`):
```python
{
    "generation": "generation",
    "familienname": "last_name",
    "vorname": "first_name",
    "geb als": "maiden_name",
    "geburtsdatum": "birth_date",
    "geburtsort": "birth_place",
    "todesdatum": "death_date",
    "sterbeort": "death_place",
    "verheiratet mit": "spouse",
    "bemerkung": "notes",
}
```

**File structure:**
- Create: `tools/import-normalizer/persons_tree.py`
- Create: `tools/import-normalizer/tests/test_persons_tree.py`

---

## Task 1: Year extraction from cell string

**Files:**
- Create: `tools/import-normalizer/persons_tree.py`
- Create: `tools/import-normalizer/tests/test_persons_tree.py`

The trickiest part of this tool. Birth/death cells arrive as strings from `ingest.read_sheet()`:
- Date-formatted cells: ISO string `"1920-09-20"` → `parse_date()` handles it
- Plain number cells (the majority): numeric string `"7568"` → `parse_date("7568")` returns UNKNOWN (7568 > 2100 so `expand_year()` rejects it) → we must detect this and apply Excel serial conversion: `date(1899,12,30) + timedelta(days=7568)` → 1920
- German string dates: `"30.8.1862"` → `parse_date()` handles it
- Year-only: `"1930"` → `parse_date()` handles it
- Free text: `"August 1941"` → `parse_date()` handles it
- Unresolvable: `"2.9.196"`, `"4.3.1023"` → return None

- [ ] **Step 1: Write the failing tests**

Create `tools/import-normalizer/tests/test_persons_tree.py`:

```python
import sys
from pathlib import Path
sys.path.insert(0, str(Path(__file__).parent.parent))

import persons_tree


def test_parse_year_iso_string():
    assert persons_tree._parse_year("1920-09-20") == 1920


def test_parse_year_excel_serial_birth():
    # 7568 days from 1899-12-30 = 1920-09-19 or -20 depending on leap counting
    assert persons_tree._parse_year("7568") == 1920


def test_parse_year_excel_serial_death():
    # 36222 days from 1899-12-30 ≈ 1999
    assert persons_tree._parse_year("36222") == 1999


def test_parse_year_excel_serial_small():
    # 177 days from 1899-12-30 = 1900-06-25
    assert persons_tree._parse_year("177") == 1900


def test_parse_year_german_date_string():
    assert persons_tree._parse_year("30.8.1862") == 1862


def test_parse_year_year_only():
    assert persons_tree._parse_year("1930") == 1930


def test_parse_year_free_text():
    assert persons_tree._parse_year("August 1941") == 1941


def test_parse_year_none():
    assert persons_tree._parse_year(None) is None


def test_parse_year_empty():
    assert persons_tree._parse_year("") is None


def test_parse_year_unresolvable_truncated():
    # "2.9.196" has no valid 4-digit year — returns None
    assert persons_tree._parse_year("2.9.196") is None


def test_parse_year_typo_year():
    # "4.3.1023" — year 1023 outside 1500-2100 guard — returns None
    assert persons_tree._parse_year("4.3.1023") is None
```

- [ ] **Step 2: Run tests — verify they all fail with ImportError or NameError**

```bash
cd tools/import-normalizer
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: `ImportError: No module named 'persons_tree'`

- [ ] **Step 3: Create `persons_tree.py` with `_parse_year`**

```python
"""Normalize Personendatei 2.xlsx into canonical-persons-tree.json."""
import argparse
import datetime
import json
import re
import sys
from pathlib import Path

import config
import dates
from persons import _strip_accents


def _parse_year(raw: str | None) -> int | None:
    """Extract a birth/death year from an Excel cell string.

    Handles four cases:
    1. ISO string (openpyxl date-formatted cell) → parse_date()
    2. Numeric string that is an Excel serial (1-80000) → timedelta conversion
    3. Any other string → parse_date()
    4. Unresolvable → None
    """
    if raw is None:
        return None
    s = str(raw).strip()
    if not s:
        return None

    # Try parse_date first (handles ISO, DD.MM.YYYY, year-only, month+year, etc.)
    result = dates.parse_date(s)
    if result.iso:
        return int(result.iso[:4])

    # If it's a pure integer string, try Excel serial conversion.
    # parse_date() returns UNKNOWN for serials like "7568" because 7568 > 2100.
    if re.fullmatch(r"\d+", s):
        n = int(s)
        if 1 <= n <= 80_000:
            d = datetime.date(1899, 12, 30) + datetime.timedelta(days=n)
            if 1500 <= d.year <= 2100:
                return d.year

    return None
```

- [ ] **Step 4: Run tests — verify they pass**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 11 tests PASS.

- [ ] **Step 5: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add persons_tree skeleton + year extraction"
```

---

## Task 2: Generation number parsing

**Files:**
- Modify: `tools/import-normalizer/persons_tree.py`
- Modify: `tools/import-normalizer/tests/test_persons_tree.py`

Column A has values like `"G 3"`, `"G3"`, `"G  0"`, `"G 2         de Gruyter"`, `"G  0"`. Extract the first digit sequence.

- [ ] **Step 1: Write failing tests**

Append to `tests/test_persons_tree.py`:

```python
def test_parse_generation_space():
    assert persons_tree._parse_generation("G 3") == 3


def test_parse_generation_no_space():
    assert persons_tree._parse_generation("G3") == 3


def test_parse_generation_extra_spaces():
    assert persons_tree._parse_generation("G  0") == 0


def test_parse_generation_trailing_garbage():
    assert persons_tree._parse_generation("G 2         de Gruyter") == 2


def test_parse_generation_empty():
    assert persons_tree._parse_generation("") is None


def test_parse_generation_none():
    assert persons_tree._parse_generation(None) is None
```

- [ ] **Step 2: Run — expect NameError**

```bash
.venv/bin/pytest tests/test_persons_tree.py::test_parse_generation_space -v
```

Expected: `AttributeError: module 'persons_tree' has no attribute '_parse_generation'`

- [ ] **Step 3: Implement `_parse_generation`**

Add to `persons_tree.py` after `_parse_year`:

```python
def _parse_generation(raw: str | None) -> int | None:
    """Extract the generation integer from column A values like 'G 3', 'G3', 'G  0'."""
    if not raw:
        return None
    m = re.search(r"\d+", str(raw))
    return int(m.group()) if m else None
```

- [ ] **Step 4: Run — expect all generation tests pass**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 17 tests PASS.

- [ ] **Step 5: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add generation parser to persons_tree"
```

---

## Task 3: Name normalization and lookup index

**Files:**
- Modify: `tools/import-normalizer/persons_tree.py`
- Modify: `tools/import-normalizer/tests/test_persons_tree.py`

The lookup index maps normalized name strings to lists of `rowId`s. `_norm_tree` extends `persons._norm` with parenthetical stripping and geographic suffix removal. The index is built with four keys per person: `"first last"`, `"last first"`, `"first maiden"`, and `last` alone (for single-token fallback).

- [ ] **Step 1: Write failing tests**

Append to `tests/test_persons_tree.py`:

```python
def test_norm_tree_basic():
    assert persons_tree._norm_tree("Werner Allemeyer") == "werner allemeyer"


def test_norm_tree_diacritics():
    assert persons_tree._norm_tree("Wöhler") == "woehler"


def test_norm_tree_strips_parens():
    assert persons_tree._norm_tree("Otto (Herbert)") == "otto"


def test_norm_tree_strips_quotes():
    assert persons_tree._norm_tree('"Tante Lolly"') == "tante lolly"


def test_norm_tree_strips_geographic_suffix():
    assert persons_tree._norm_tree("Walter Cram Aachen") == "walter cram"


def test_norm_tree_strips_mexiko():
    assert persons_tree._norm_tree("Hans Cram Mexiko") == "hans cram"


def test_norm_tree_collapses_whitespace():
    assert persons_tree._norm_tree("  Clara   de Gruyter  ") == "clara de gruyter"


def test_build_index_forward_lookup():
    persons = [{"rowId": "row_002", "firstName": "Werner", "lastName": "Allemeyer", "maidenName": None}]
    idx = persons_tree._build_index(persons)
    assert "werner allemeyer" in idx
    assert idx["werner allemeyer"] == ["row_002"]


def test_build_index_reversed_lookup():
    persons = [{"rowId": "row_002", "firstName": "Werner", "lastName": "Allemeyer", "maidenName": None}]
    idx = persons_tree._build_index(persons)
    # col I uses reversed order: "Allemeyer Werner"
    assert idx.get("allemeyer werner") == ["row_002"]


def test_build_index_maiden_name_lookup():
    persons = [{"rowId": "row_002", "firstName": "Elsgard", "lastName": "Allemeyer", "maidenName": "Wöhler"}]
    idx = persons_tree._build_index(persons)
    # maiden-name form: "Elsgard Wöhler" -> "elsgard woehler"
    assert idx.get("elsgard woehler") == ["row_002"]


def test_build_index_single_token_fallback():
    persons = [{"rowId": "row_028", "firstName": "Herbert", "lastName": "Cram", "maidenName": None}]
    idx = persons_tree._build_index(persons)
    assert idx.get("cram") == ["row_028"]


def test_build_index_ambiguous_single_token():
    persons = [
        {"rowId": "row_028", "firstName": "Herbert", "lastName": "Cram", "maidenName": None},
        {"rowId": "row_019", "firstName": "Clara", "lastName": "Cram", "maidenName": None},
    ]
    idx = persons_tree._build_index(persons)
    # "cram" alone is ambiguous — both rows map to it
    assert set(idx["cram"]) == {"row_028", "row_019"}


def test_resolve_one_found():
    persons = [{"rowId": "row_003", "firstName": "Werner", "lastName": "Allemeyer", "maidenName": None}]
    idx = persons_tree._build_index(persons)
    row_id, reason = persons_tree._resolve_one("Allemeyer Werner", idx)
    assert row_id == "row_003"
    assert reason is None


def test_resolve_one_not_found():
    idx = {}
    row_id, reason = persons_tree._resolve_one("Nobody Unknown", idx)
    assert row_id is None
    assert reason == "not_found"


def test_resolve_one_ambiguous():
    persons = [
        {"rowId": "row_028", "firstName": "Herbert", "lastName": "Cram", "maidenName": None},
        {"rowId": "row_019", "firstName": "Clara", "lastName": "Cram", "maidenName": None},
    ]
    idx = persons_tree._build_index(persons)
    row_id, reason = persons_tree._resolve_one("Cram", idx)
    assert row_id is None
    assert reason == "ambiguous"
```

- [ ] **Step 2: Run — expect failures**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v -k "norm_tree or build_index or resolve_one"
```

Expected: `AttributeError: module 'persons_tree' has no attribute '_norm_tree'`

- [ ] **Step 3: Implement `_norm_tree`, `_build_index`, `_resolve_one`**

Add to `persons_tree.py`:

```python
_GEO_SUFFIXES = {"aachen", "mex", "mexiko", "sen", "jun", "jr"}


def _norm_tree(s: str) -> str:
    """Normalize a name string for tree matching.

    - Lowercase + diacritic → ASCII (uses persons._strip_accents logic)
    - Strip surrounding quote characters
    - Remove parenthetical substrings: "(Herbert)" → ""
    - Replace dots with spaces (e.g. "Jr." → "Jr ")
    - Remove known geographic/honorific suffix tokens
    - Collapse whitespace
    """
    s = (s or "").strip().strip("\"'")
    s = re.sub(r"\([^)]*\)", "", s)
    s = _strip_accents(s).lower().replace(".", " ")
    tokens = [t for t in s.split() if t and t not in _GEO_SUFFIXES]
    return " ".join(tokens).strip("., ")


def _build_index(persons: list[dict]) -> dict[str, list[str]]:
    """Build a name → [rowId, …] lookup index with four keys per person."""
    index: dict[str, list[str]] = {}

    def _add(key: str, row_id: str) -> None:
        if key:
            index.setdefault(key, []).append(row_id)

    for p in persons:
        row_id = p["rowId"]
        first = p.get("firstName") or ""
        last = p.get("lastName") or ""
        maiden = p.get("maidenName") or ""

        _add(_norm_tree(f"{first} {last}"), row_id)   # "Werner Allemeyer"
        _add(_norm_tree(f"{last} {first}"), row_id)   # "Allemeyer Werner" (col I order)
        if maiden:
            _add(_norm_tree(f"{first} {maiden}"), row_id)  # maiden-name reference
        _add(_norm_tree(last), row_id)                 # single-token fallback

    return index


def _resolve_one(raw: str, index: dict[str, list[str]]) -> tuple[str | None, str | None]:
    """Return (row_id, None) on unique match, (None, reason) otherwise."""
    key = _norm_tree(raw)
    if not key:
        return None, "empty"
    hits = index.get(key, [])
    if len(hits) == 1:
        return hits[0], None
    if len(hits) == 0:
        return None, "not_found"
    return None, "ambiguous"
```

- [ ] **Step 4: Run — all tests pass**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 36 tests PASS.

- [ ] **Step 5: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add name normalization + lookup index to persons_tree"
```

---

## Task 4: Row-level person parsing (pass 1)

**Files:**
- Modify: `tools/import-normalizer/persons_tree.py`
- Modify: `tools/import-normalizer/tests/test_persons_tree.py`

`_parse_row(row_num, fields)` takes a 1-based row number and a field dict (from `build_header_map`) and produces the person record. Unresolvable date raw values are appended to notes. Internal keys `_spouse_raw` and `_bemerkung_raw` carry forward to pass 2 and are stripped before JSON output.

- [ ] **Step 1: Write failing tests**

Append to `tests/test_persons_tree.py`:

```python
def test_parse_row_serial_dates():
    fields = {
        "generation": "G 3", "last_name": "Allemeyer", "first_name": "Elsgard",
        "maiden_name": "Wöhler", "birth_date": "7568", "birth_place": "Garz",
        "death_date": "36222", "death_place": "Espelkamp",
        "spouse": "Allemeyer Werner", "notes": "Nichte von Herbert",
    }
    p = persons_tree._parse_row(2, fields)
    assert p["rowId"] == "row_002"
    assert p["firstName"] == "Elsgard"
    assert p["lastName"] == "Allemeyer"
    assert p["maidenName"] == "Wöhler"
    assert p["birthYear"] == 1920
    assert p["deathYear"] == 1999
    assert p["birthPlace"] == "Garz"
    assert p["deathPlace"] == "Espelkamp"
    assert p["generation"] == 3
    assert p["familyMember"] is True
    assert p["_spouse_raw"] == "Allemeyer Werner"
    assert p["_bemerkung_raw"] == "Nichte von Herbert"
    # no date annotation in notes because both dates resolved
    assert "[Geburtsdatum" not in (p["notes"] or "")


def test_parse_row_string_birth_date():
    fields = {
        "generation": "G 2", "last_name": "Cram", "first_name": "Herbert",
        "maiden_name": "", "birth_date": "25.6.1890", "birth_place": "Texas",
        "death_date": "", "death_place": "", "spouse": "", "notes": "",
    }
    p = persons_tree._parse_row(28, fields)
    assert p["birthYear"] == 1890
    assert p["deathYear"] is None
    assert p["notes"] is None or p["notes"] == ""


def test_parse_row_unresolvable_date_goes_to_notes():
    fields = {
        "generation": "G 3", "last_name": "Heydrich", "first_name": "Dieter",
        "maiden_name": "", "birth_date": "28.9.", "birth_place": "",
        "death_date": "", "death_place": "", "spouse": "", "notes": "Bruder v Ingrid",
    }
    p = persons_tree._parse_row(96, fields)
    assert p["birthYear"] is None
    assert "[Geburtsdatum: 28.9.]" in p["notes"]
    assert "Bruder v Ingrid" in p["notes"]


def test_parse_row_empty_spouse_and_notes():
    fields = {
        "generation": "G 4", "last_name": "Allemeyer", "first_name": "Jürgen",
        "maiden_name": "", "birth_date": "", "birth_place": "",
        "death_date": "", "death_place": "", "spouse": "", "notes": "",
    }
    p = persons_tree._parse_row(4, fields)
    assert p["_spouse_raw"] is None
    assert p["_bemerkung_raw"] is None
```

- [ ] **Step 2: Run — expect NameError**

```bash
.venv/bin/pytest tests/test_persons_tree.py -k "parse_row" -v
```

Expected: `AttributeError: module 'persons_tree' has no attribute '_parse_row'`

- [ ] **Step 3: Implement `_parse_row`**

Add to `persons_tree.py`:

```python
def _parse_row(row_num: int, fields: dict) -> dict:
    """Produce one person record from a header-mapped row dict.

    Internal keys prefixed with '_' are stripped before JSON output in main().
    """
    def s(key: str) -> str:
        return (fields.get(key) or "").strip()

    birth_raw = s("birth_date")
    death_raw = s("death_date")

    birth_year = _parse_year(birth_raw)
    death_year = _parse_year(death_raw)

    notes_parts = []
    if birth_raw and birth_year is None:
        notes_parts.append(f"[Geburtsdatum: {birth_raw}]")
    if death_raw and death_year is None:
        notes_parts.append(f"[Todesdatum: {death_raw}]")
    bemerkung = s("notes")
    if bemerkung:
        notes_parts.append(bemerkung)

    maiden = s("maiden_name") or None
    spouse = s("spouse") or None
    bemerkung_out = bemerkung or None

    return {
        "rowId": f"row_{row_num:03d}",
        "firstName": s("first_name"),
        "lastName": s("last_name"),
        "maidenName": maiden,
        "alias": None,
        "notes": " ".join(notes_parts) or None,
        "birthYear": birth_year,
        "deathYear": death_year,
        "birthPlace": s("birth_place") or None,
        "deathPlace": s("death_place") or None,
        "generation": _parse_generation(s("generation")),
        "familyMember": True,
        "_spouse_raw": spouse,
        "_bemerkung_raw": bemerkung_out,
    }
```

- [ ] **Step 4: Run — all tests pass**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 40 tests PASS.

- [ ] **Step 5: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add row parser to persons_tree"
```

---

## Task 5: Deduplication

**Files:**
- Modify: `tools/import-normalizer/persons_tree.py`
- Modify: `tools/import-normalizer/tests/test_persons_tree.py`

Two-stage deduplication:
1. Exact `(firstName, lastName, birthYear)` match — catches rows 127/138 (same name + serial).
2. `(firstName, lastName)` match where the later entry has `birthYear=None` and an earlier entry has a birthYear — catches rows 129/139 (one has a date, the other doesn't).

- [ ] **Step 1: Write failing tests**

Append to `tests/test_persons_tree.py`:

```python
def test_deduplicate_no_duplicates():
    persons = [
        {"rowId": "row_002", "firstName": "Elsgard", "lastName": "Allemeyer", "birthYear": 1920},
        {"rowId": "row_003", "firstName": "Werner", "lastName": "Allemeyer", "birthYear": 1923},
    ]
    result, skipped = persons_tree._deduplicate(persons)
    assert len(result) == 2
    assert skipped == []


def test_deduplicate_exact_match():
    # rows 127/138: same firstName, lastName, birthYear
    persons = [
        {"rowId": "row_127", "firstName": "Christa", "lastName": "Schütz", "birthYear": 1951},
        {"rowId": "row_138", "firstName": "Christa", "lastName": "Schütz", "birthYear": 1951},
    ]
    result, skipped = persons_tree._deduplicate(persons)
    assert [p["rowId"] for p in result] == ["row_127"]
    assert len(skipped) == 1
    assert "row_138" in skipped[0]


def test_deduplicate_none_birth_year_after_known():
    # rows 129/139: row 129 has birthYear=1964, row 139 has birthYear=None
    persons = [
        {"rowId": "row_129", "firstName": "Christoph", "lastName": "Seils", "birthYear": 1964},
        {"rowId": "row_139", "firstName": "Christoph", "lastName": "Seils", "birthYear": None},
    ]
    result, skipped = persons_tree._deduplicate(persons)
    assert [p["rowId"] for p in result] == ["row_129"]
    assert len(skipped) == 1


def test_deduplicate_both_none_birth_year_kept():
    # Two people with no birth year but same name: keep first only
    persons = [
        {"rowId": "row_A", "firstName": "Hans", "lastName": "Cram", "birthYear": None},
        {"rowId": "row_B", "firstName": "Hans", "lastName": "Cram", "birthYear": None},
    ]
    result, skipped = persons_tree._deduplicate(persons)
    assert [p["rowId"] for p in result] == ["row_A"]
    assert len(skipped) == 1
```

- [ ] **Step 2: Run — expect NameError**

```bash
.venv/bin/pytest tests/test_persons_tree.py -k "deduplicate" -v
```

Expected: `AttributeError: module 'persons_tree' has no attribute '_deduplicate'`

- [ ] **Step 3: Implement `_deduplicate`**

Add to `persons_tree.py`:

```python
def _deduplicate(persons: list[dict]) -> tuple[list[dict], list[str]]:
    """Remove duplicate rows. Two-stage:

    1. Exact (firstName, lastName, birthYear) match.
    2. (firstName, lastName) where the later entry has birthYear=None and an earlier
       entry already has a known birthYear.
    """
    seen_full: dict[tuple, str] = {}   # (first, last, year) -> rowId
    seen_name: dict[tuple, str] = {}   # (first, last) -> rowId of first entry with a year
    result: list[dict] = []
    skipped: list[str] = []

    for p in persons:
        first, last, year = p["firstName"], p["lastName"], p["birthYear"]
        key_full = (first, last, year)
        key_name = (first, last)

        if key_full in seen_full:
            skipped.append(f"{p['rowId']} duplicates {seen_full[key_full]} ({first} {last}, year={year})")
            continue

        if year is None and key_name in seen_name:
            skipped.append(f"{p['rowId']} duplicates {seen_name[key_name]} ({first} {last}, no birth year)")
            continue

        seen_full[key_full] = p["rowId"]
        if year is not None:
            seen_name[key_name] = p["rowId"]

        result.append(p)

    return result, skipped
```

- [ ] **Step 4: Run — all tests pass**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 44 tests PASS.

- [ ] **Step 5: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add deduplication to persons_tree"
```

---

## Task 6: SPOUSE_OF relationship extraction

**Files:**
- Modify: `tools/import-normalizer/persons_tree.py`
- Modify: `tools/import-normalizer/tests/test_persons_tree.py`

Walk every person's `_spouse_raw`, resolve via the name index, and emit one `SPOUSE_OF` edge per matched pair. Skip if an identical edge (either direction) already exists. Unresolved entries go to `unresolved[]`.

- [ ] **Step 1: Write failing tests**

Append to `tests/test_persons_tree.py`:

```python
def _make_persons(*args):
    """Helper: args are (rowId, firstName, lastName, maidenName, spouse_raw) tuples."""
    return [
        {"rowId": a[0], "firstName": a[1], "lastName": a[2], "maidenName": a[3],
         "_spouse_raw": a[4], "_bemerkung_raw": None,
         "birthYear": None, "deathYear": None, "birthPlace": None, "deathPlace": None,
         "generation": None, "familyMember": True, "alias": None, "notes": None}
        for a in args
    ]


def test_resolve_spouses_success():
    persons = _make_persons(
        ("row_002", "Elsgard", "Allemeyer", "Wöhler", "Allemeyer Werner"),
        ("row_003", "Werner", "Allemeyer", None, "Elsgard Wöhler"),
    )
    idx = persons_tree._build_index(persons)
    rels, unres = persons_tree._resolve_spouses(persons, idx)
    # Both rows reference each other, but only ONE edge should be emitted
    assert len(rels) == 1
    assert rels[0]["type"] == "SPOUSE_OF"
    assert set([rels[0]["personId"], rels[0]["relatedPersonId"]]) == {"row_002", "row_003"}
    assert unres == []


def test_resolve_spouses_not_found():
    persons = _make_persons(
        ("row_007", "Charlotte", "Blomquist", "Ruge", '"Tante Lolly"'),
    )
    idx = persons_tree._build_index(persons)
    rels, unres = persons_tree._resolve_spouses(persons, idx)
    assert rels == []
    assert len(unres) == 1
    assert unres[0]["rowId"] == "row_007"
    assert unres[0]["reason"] == "not_found"


def test_resolve_spouses_empty_spouse_field():
    persons = _make_persons(
        ("row_004", "Jürgen", "Allemeyer", None, None),
    )
    idx = persons_tree._build_index(persons)
    rels, unres = persons_tree._resolve_spouses(persons, idx)
    assert rels == [] and unres == []
```

- [ ] **Step 2: Run — expect NameError**

```bash
.venv/bin/pytest tests/test_persons_tree.py -k "resolve_spouses" -v
```

Expected: `AttributeError: module 'persons_tree' has no attribute '_resolve_spouses'`

- [ ] **Step 3: Implement `_resolve_spouses`**

Add to `persons_tree.py`:

```python
def _resolve_spouses(
    persons: list[dict], index: dict[str, list[str]]
) -> tuple[list[dict], list[dict]]:
    """Emit SPOUSE_OF edges from each person's _spouse_raw field."""
    relationships: list[dict] = []
    unresolved: list[dict] = []
    emitted: set[frozenset] = set()

    for p in persons:
        raw = (p.get("_spouse_raw") or "").strip()
        if not raw:
            continue
        row_id = p["rowId"]
        matched_id, reason = _resolve_one(raw, index)
        if matched_id:
            edge = frozenset([row_id, matched_id])
            if edge not in emitted:
                emitted.add(edge)
                relationships.append({
                    "personId": row_id,
                    "relatedPersonId": matched_id,
                    "type": "SPOUSE_OF",
                    "source": "verheiratet_mit",
                })
        else:
            unresolved.append({
                "rowId": row_id,
                "field": "verheiratet_mit",
                "raw": raw,
                "reason": reason,
            })

    return relationships, unresolved
```

- [ ] **Step 4: Run — all tests pass**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 47 tests PASS.

- [ ] **Step 5: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add SPOUSE_OF resolution to persons_tree"
```

---

## Task 7: PARENT_OF extraction from Bemerkung

**Files:**
- Modify: `tools/import-normalizer/persons_tree.py`
- Modify: `tools/import-normalizer/tests/test_persons_tree.py`

Two patterns anchored at start-of-string:
- `Sohn|Tochter + v(on)? + names` → named persons are parents of this row's person
- `Vater|Mutter + v(on)? + names` → this row's person is parent of named persons

Names after the keyword may be two people joined by ` u ` or ` und `. Each part is resolved independently. Unmatched parts go to `unresolved[]`. The matched portion is stripped from `notes`; the remainder of the Bemerkung stays in `notes`.

Everything that doesn't match any parent pattern goes to `notes` unchanged (no unresolved entry).

- [ ] **Step 1: Write failing tests**

Append to `tests/test_persons_tree.py`:

```python
def _register(*args):
    """Build index from (rowId, first, last, maiden) tuples."""
    persons = [
        {"rowId": a[0], "firstName": a[1], "lastName": a[2], "maidenName": a[3]}
        for a in args
    ]
    return persons, persons_tree._build_index(persons)


def test_parse_bemerkung_sohn_two_parents():
    _, idx = _register(
        ("row_019", "Clara", "Cram", "de Gruyter"),
        ("row_028", "Herbert", "Cram", None),
    )
    rels, unres, notes = persons_tree._parse_bemerkung(
        "row_021", "Sohn v Clara u Herbert", idx
    )
    assert len(rels) == 2
    assert all(r["type"] == "PARENT_OF" for r in rels)
    # Both parents point to the child
    child_ids = {r["relatedPersonId"] for r in rels}
    parent_ids = {r["personId"] for r in rels}
    assert child_ids == {"row_021"}
    assert "row_019" in parent_ids and "row_028" in parent_ids
    assert unres == []
    assert notes == ""


def test_parse_bemerkung_tochter_von():
    _, idx = _register(("row_019", "Clara", "Cram", None))
    rels, unres, notes = persons_tree._parse_bemerkung(
        "row_036", "Tochter von Clara Cram", idx
    )
    assert len(rels) == 1
    assert rels[0] == {
        "personId": "row_019",
        "relatedPersonId": "row_036",
        "type": "PARENT_OF",
        "source": "bemerkung",
        "rawBemerkung": "Tochter von Clara Cram",
    }
    assert notes == ""


def test_parse_bemerkung_vater():
    _, idx = _register(("row_028", "Herbert", "Cram", None))
    rels, unres, notes = persons_tree._parse_bemerkung(
        "row_031", "Vater v Herbert", idx
    )
    assert len(rels) == 1
    assert rels[0]["personId"] == "row_031"   # this person is the parent
    assert rels[0]["relatedPersonId"] == "row_028"
    assert rels[0]["type"] == "PARENT_OF"


def test_parse_bemerkung_unmatched_parent_name():
    _, idx = _register()   # empty index
    rels, unres, notes = persons_tree._parse_bemerkung(
        "row_004", "Sohn v Elsgard A.", idx
    )
    assert rels == []
    assert len(unres) == 1
    assert unres[0]["reason"] == "not_found"
    # notes should be empty after stripping the matched pattern
    assert notes == ""


def test_parse_bemerkung_skip_nichte():
    _, idx = _register(("row_028", "Herbert", "Cram", None))
    rels, unres, notes = persons_tree._parse_bemerkung(
        "row_002", "Nichte von Herbert", idx
    )
    assert rels == []
    assert unres == []
    assert notes == "Nichte von Herbert"


def test_parse_bemerkung_skip_bruder():
    _, idx = _register(("row_028", "Herbert", "Cram", None))
    rels, unres, notes = persons_tree._parse_bemerkung(
        "row_033", "Bruder v Herbert", idx
    )
    assert rels == []
    assert unres == []
    assert notes == "Bruder v Herbert"


def test_parse_bemerkung_empty():
    _, idx = _register()
    rels, unres, notes = persons_tree._parse_bemerkung("row_004", "", idx)
    assert rels == [] and unres == [] and notes == ""


def test_parse_bemerkung_plain_remark():
    _, idx = _register()
    rels, unres, notes = persons_tree._parse_bemerkung(
        "row_029", "Verfasserin der Cram-Chronik !!", idx
    )
    assert rels == [] and unres == []
    assert notes == "Verfasserin der Cram-Chronik !!"
```

- [ ] **Step 2: Run — expect NameError**

```bash
.venv/bin/pytest tests/test_persons_tree.py -k "parse_bemerkung" -v
```

Expected: `AttributeError: module 'persons_tree' has no attribute '_parse_bemerkung'`

- [ ] **Step 3: Implement `_parse_bemerkung`**

Add to `persons_tree.py`:

```python
_CHILD_RE = re.compile(r"^(?:Sohn|Tochter)\s+v(?:on)?\s+(.+)", re.I)
_PARENT_RE = re.compile(r"^(?:Vater|Mutter)\s+v(?:on)?\s+(.+)", re.I)
_AND_RE = re.compile(r"\s+u(?:nd)?\s+", re.I)


def _parse_bemerkung(
    row_id: str, bemerkung: str, index: dict[str, list[str]]
) -> tuple[list[dict], list[dict], str]:
    """Extract PARENT_OF edges from a Bemerkung cell.

    Returns (relationships, unresolved, remaining_notes).
    Text that doesn't match a parent pattern goes to remaining_notes unchanged.
    """
    if not bemerkung or not bemerkung.strip():
        return [], [], ""

    s = bemerkung.strip()

    for pattern, direction in ((_CHILD_RE, "child"), (_PARENT_RE, "parent")):
        m = pattern.match(s)
        if not m:
            continue

        name_part = m.group(1).strip().rstrip("!., ")
        parts = [p.strip() for p in _AND_RE.split(name_part) if p.strip()]
        rels: list[dict] = []
        unres: list[dict] = []

        for part in parts:
            part = part.rstrip("!., ")
            matched_id, reason = _resolve_one(part, index)
            if matched_id:
                if direction == "child":
                    # named person is parent of this row
                    rels.append({
                        "personId": matched_id,
                        "relatedPersonId": row_id,
                        "type": "PARENT_OF",
                        "source": "bemerkung",
                        "rawBemerkung": bemerkung,
                    })
                else:
                    # this row is parent of named person
                    rels.append({
                        "personId": row_id,
                        "relatedPersonId": matched_id,
                        "type": "PARENT_OF",
                        "source": "bemerkung",
                        "rawBemerkung": bemerkung,
                    })
            else:
                unres.append({
                    "rowId": row_id,
                    "field": "bemerkung",
                    "raw": bemerkung,
                    "reason": reason,
                })

        remainder = s[m.end():].strip().lstrip(".,! ")
        return rels, unres, remainder

    # No pattern matched — full text goes to notes, nothing to unresolved
    return [], [], s
```

- [ ] **Step 4: Run — all tests pass**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 55 tests PASS.

- [ ] **Step 5: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add PARENT_OF Bemerkung extraction to persons_tree"
```

---

## Task 8: main() — CLI, two-pass loop, JSON output

**Files:**
- Modify: `tools/import-normalizer/persons_tree.py`
- Modify: `tools/import-normalizer/tests/test_persons_tree.py`

Wire the two passes into `main()`. Pass 1: read sheet → parse rows → deduplicate → build index. Pass 2: resolve spouses + parse Bemerkung → collect relationships + unresolved → strip internal `_` keys → write JSON.

- [ ] **Step 1: Write failing test for dry-run**

Append to `tests/test_persons_tree.py`:

```python
import subprocess


def test_dry_run_exits_zero(tmp_path):
    """dry-run should complete without writing any file and exit 0."""
    input_path = Path(__file__).parent.parent.parent.parent / "import" / "Personendatei 2.xlsx"
    if not input_path.exists():
        import pytest
        pytest.skip("source Excel file not present")

    result = subprocess.run(
        [
            sys.executable, str(Path(__file__).parent.parent / "persons_tree.py"),
            "--input", str(input_path),
            "--output", str(tmp_path / "out.json"),
            "--dry-run",
        ],
        capture_output=True, text=True,
    )
    assert result.returncode == 0, result.stderr
    assert not (tmp_path / "out.json").exists()
    assert "persons parsed" in result.stdout
```

- [ ] **Step 2: Run — expect NameError/AttributeError**

```bash
.venv/bin/pytest tests/test_persons_tree.py::test_dry_run_exits_zero -v
```

Expected: `AttributeError: module 'persons_tree' has no attribute 'main'` or exit code != 0.

- [ ] **Step 3: Implement `main()`**

Add to `persons_tree.py`:

```python
def main() -> None:
    parser = argparse.ArgumentParser(
        description="Normalize Personendatei 2.xlsx → canonical-persons-tree.json"
    )
    parser.add_argument(
        "--input", default=str(config.PERSON_WORKBOOK),
        help="Path to Personendatei 2.xlsx"
    )
    parser.add_argument(
        "--output", default=str(config.OUT_DIR / "canonical-persons-tree.json"),
        help="Path for output JSON"
    )
    parser.add_argument("--dry-run", action="store_true", help="Print stats, skip write")
    args = parser.parse_args()

    from ingest import read_sheet, build_header_map

    rows = read_sheet(Path(args.input), config.PERSON_SHEET)
    if not rows:
        print("ERROR: sheet is empty", file=sys.stderr)
        sys.exit(1)

    header_row = [str(v) for v in rows[0]]
    fields_map, _ = build_header_map(header_row, config.PERSON_HEADER_MAP, config.PERSON_REQUIRED_FIELDS)

    # --- Pass 1: parse rows ---
    persons_raw: list[dict] = []
    for row_num, row in enumerate(rows[1:], start=2):
        field_dict = {field: (row[col] if col < len(row) else "") for field, col in fields_map.items()}
        if not field_dict.get("last_name", "").strip():
            continue
        persons_raw.append(_parse_row(row_num, field_dict))

    persons, skipped_msgs = _deduplicate(persons_raw)
    for msg in skipped_msgs:
        print(f"  SKIP {msg}", file=sys.stderr)

    index = _build_index(persons)

    # --- Pass 2: resolve relationships ---
    all_rels: list[dict] = []
    all_unresolved: list[dict] = []

    spouse_rels, spouse_unres = _resolve_spouses(persons, index)
    all_rels.extend(spouse_rels)
    all_unresolved.extend(spouse_unres)

    for p in persons:
        bemerkung = p.pop("_bemerkung_raw", None) or ""
        p.pop("_spouse_raw", None)

        rels, unres, remaining = _parse_bemerkung(p["rowId"], bemerkung, index)
        all_rels.extend(rels)
        all_unresolved.extend(unres)

        if remaining:
            existing = p.get("notes") or ""
            # avoid duplicating the bemerkung that was already put in notes during _parse_row
            if remaining not in existing:
                p["notes"] = (existing + " " + remaining).strip() if existing else remaining

    # --- Stats output ---
    spouse_count = sum(1 for r in all_rels if r["type"] == "SPOUSE_OF")
    parent_count = sum(1 for r in all_rels if r["type"] == "PARENT_OF")
    print(f"✓ {len(persons)} persons parsed")
    print(f"✓ {len(all_rels)} relationships emitted ({spouse_count} SPOUSE_OF, {parent_count} PARENT_OF)")
    if all_unresolved:
        print(f"⚠  {len(all_unresolved)} unresolved (see unresolved[] in output)")

    if args.dry_run:
        print("\n--- dry-run: first 5 unresolved ---")
        for u in all_unresolved[:5]:
            print(f"  {u}")
        return

    output = {
        "generated_at": datetime.datetime.now().isoformat(),
        "source": Path(args.input).name,
        "stats": {
            "persons": len(persons),
            "relationships": len(all_rels),
            "unresolved": len(all_unresolved),
        },
        "persons": persons,
        "relationships": all_rels,
        "unresolved": all_unresolved,
    }

    out_path = Path(args.output)
    out_path.parent.mkdir(exist_ok=True)
    out_path.write_text(json.dumps(output, ensure_ascii=False, indent=2), encoding="utf-8")
    print(f"→  {args.output}")


if __name__ == "__main__":
    main()
```

- [ ] **Step 4: Run dry-run test**

```bash
.venv/bin/pytest tests/test_persons_tree.py::test_dry_run_exits_zero -v
```

Expected: PASS. (If the Excel file is absent the test is skipped, not failed.)

- [ ] **Step 5: Run all tests**

```bash
.venv/bin/pytest tests/test_persons_tree.py -v
```

Expected: all 56 tests PASS (or 55 + 1 skipped if Excel file absent).

- [ ] **Step 6: Commit**

```bash
git add tools/import-normalizer/persons_tree.py tools/import-normalizer/tests/test_persons_tree.py
git commit -m "feat(normalizer): add main() CLI to persons_tree"
```

---

## Task 9: Integration run against the real file

**Files:** none (read-only validation)

- [ ] **Step 1: Run with `--dry-run` and inspect output**

```bash
cd tools/import-normalizer
.venv/bin/python persons_tree.py --dry-run
```

Expected output (approximate — exact numbers will differ once resolved):
```
✓ ~161 persons parsed   (163 rows minus 2 duplicates)
✓ ~N relationships emitted (X SPOUSE_OF, Y PARENT_OF)
⚠  ~Z unresolved (see unresolved[] in output)

--- dry-run: first 5 unresolved ---
  {'rowId': '...', 'field': '...', 'raw': '...', 'reason': '...'}
  ...
```

If you see `ERROR` or a Python traceback, investigate before continuing.

- [ ] **Step 2: Write the output file**

```bash
.venv/bin/python persons_tree.py
```

Expected: `→  out/canonical-persons-tree.json`

- [ ] **Step 3: Spot-check the output**

```bash
python3 -c "
import json
data = json.load(open('out/canonical-persons-tree.json'))
print('persons:', data['stats']['persons'])
print('relationships:', data['stats']['relationships'])
print('unresolved:', data['stats']['unresolved'])

# Check Herbert Cram
herbert = next(p for p in data['persons'] if p['firstName'] == 'Herbert' and p['lastName'] == 'Cram')
print('Herbert:', herbert)

# Check a SPOUSE_OF edge involving Clara and Herbert
clara = next(p for p in data['persons'] if p['firstName'] == 'Clara' and p['lastName'] == 'Cram')
spouse_edge = next((r for r in data['relationships']
    if r['type'] == 'SPOUSE_OF'
    and {r['personId'], r['relatedPersonId']} == {herbert['rowId'], clara['rowId']}), None)
print('Herbert-Clara SPOUSE_OF edge:', spouse_edge)
"
```

Verify:
- `persons` ≈ 161 (163 − 2 duplicates)
- Herbert Cram has `birthYear: 1890`, `generation: 2`
- A `SPOUSE_OF` edge exists between Herbert and Clara

- [ ] **Step 4: Commit the output file**

```bash
git add out/canonical-persons-tree.json
git commit -m "feat(normalizer): add canonical-persons-tree.json output"
```

---

## Self-Review Checklist

- **§4 date parsing** → Task 1 (`_parse_year`) covers Excel serial, ISO, German string, year-only, free text, unresolvable ✓
- **§5 generation** → Task 2 (`_parse_generation`) covers all format variants ✓
- **§5 notes construction** → Task 4 (`_parse_row`) appends unresolvable date raws and bemerkung ✓
- **§6 name index** → Task 3 (`_norm_tree`, `_build_index`, `_resolve_one`) covers forward, reversed, maiden, single-token, ambiguous ✓
- **§12 OQ-01 deduplication** → Task 5 (`_deduplicate`) handles same-year + no-year cases ✓
- **§7.1 SPOUSE_OF** → Task 6 (`_resolve_spouses`) with dedup of bidirectional edges ✓
- **§7.2 PARENT_OF** → Task 7 (`_parse_bemerkung`) with Sohn/Tochter/Vater/Mutter + multi-parent split ✓
- **§9 CLI** → Task 8 (`main()`) with `--input`, `--output`, `--dry-run` ✓
- **§10 module reuse** → `ingest.read_sheet`, `ingest.build_header_map`, `dates.parse_date`, `persons._strip_accents` all used ✓
- **§11 non-goals** → no API calls, no alias records, no SIBLING_OF, no dedup vs canonical-persons.xlsx ✓
- **§8 JSON schema** → all fields present: `rowId`, `firstName`, `lastName`, `maidenName`, `alias`, `notes`, `birthYear`, `deathYear`, `birthPlace`, `deathPlace`, `generation`, `familyMember` ✓