Add GEDCOM import/export

A pragmatic GEDCOM parser + mapper: import reads INDI/FAM/SOUR and creates people, names, life events, partnership + qualified parent-child relationships, marriage events, places (deduped), sources, and citations from SOUR refs — returning a mapping report (counts + unmapped tags). Export serializes the tree back to GEDCOM (families derived from the edge model). Import is additive (no merge) and runs inline for now. Round-trip test passes; 29 tests total.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Justin Paul <justin@jpaul.me>

backend/tests/test_gedcom.py

@@ -0,0 +1,77 @@
+"""GEDCOM import + export round-trip."""
+
+from tests.conftest import auth, register
+
+SAMPLE = b"""0 HEAD
+1 CHAR UTF-8
+0 @I1@ INDI
+1 NAME John /Smith/
+1 SEX M
+1 BIRT
+2 DATE 1850
+2 PLAC Boston, Massachusetts
+0 @I2@ INDI
+1 NAME Mary /Jones/
+1 SEX F
+0 @I3@ INDI
+1 NAME Junior /Smith/
+1 BIRT
+2 DATE 1872
+0 @F1@ FAM
+1 HUSB @I1@
+1 WIFE @I2@
+1 CHIL @I3@
+1 MARR
+2 DATE 1870
+0 TRLR
+"""
+
+
+async def _tree(client, email):
+    h = auth(await register(client, email))
+    tid = (await client.post("/api/v1/trees", json={"name": "Imported"}, headers=h)).json()["id"]
+    return h, tid
+
+
+async def test_gedcom_import(client):
+    h, tid = await _tree(client, "ged1@example.com")
+    resp = await client.post(
+        f"/api/v1/trees/{tid}/gedcom/import",
+        files={"file": ("sample.ged", SAMPLE, "text/plain")},
+        headers=h,
+    )
+    assert resp.status_code == 200, resp.text
+    counts = resp.json()["counts"]
+    assert counts["persons"] == 3
+    assert counts["families"] == 1
+    # partnership (1) + parent_child from both parents to the child (2)
+    assert counts["relationships"] == 3
+    assert counts["events"] == 3  # 2 births + 1 marriage
+
+    people = (await client.get(f"/api/v1/trees/{tid}/persons", headers=h)).json()
+    assert len(people) == 3
+    rels = (await client.get(f"/api/v1/trees/{tid}/relationships", headers=h)).json()
+    assert len(rels) == 3
+
+
+async def test_gedcom_export_and_reimport(client):
+    h, tid = await _tree(client, "ged2@example.com")
+    await client.post(
+        f"/api/v1/trees/{tid}/gedcom/import",
+        files={"file": ("sample.ged", SAMPLE, "text/plain")},
+        headers=h,
+    )
+    exported = await client.get(f"/api/v1/trees/{tid}/gedcom/export", headers=h)
+    assert exported.status_code == 200
+    text = exported.text
+    assert "INDI" in text and "FAM" in text and "John /Smith/" in text
+
+    # Re-import the export into a fresh tree: people are preserved.
+    tid2 = (await client.post("/api/v1/trees", json={"name": "Round"}, headers=h)).json()["id"]
+    resp = await client.post(
+        f"/api/v1/trees/{tid2}/gedcom/import",
+        files={"file": ("rt.ged", text.encode(), "text/plain")},
+        headers=h,
+    )
+    assert resp.json()["counts"]["persons"] == 3
+    assert resp.json()["counts"]["relationships"] == 3