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/app/api/v1/__init__.py

@@ -6,6 +6,7 @@ from app.api.v1 import (
     auth,
     citations,
     events,
+    gedcom,
     media,
     persons,
     relationships,
@@ -24,3 +25,4 @@ api_router.include_router(relationships.router)
 api_router.include_router(sources.router)
 api_router.include_router(citations.router)
 api_router.include_router(media.router)
+api_router.include_router(gedcom.router)

backend/app/api/v1/gedcom.py

@@ -0,0 +1,37 @@
+import uuid
+
+from fastapi import APIRouter, File, Response, UploadFile
+
+from app.api.deps import CurrentUser, SessionDep
+from app.schemas.gedcom import ImportReport
+from app.services import gedcom, tree_service
+
+router = APIRouter(prefix="/trees", tags=["gedcom"])
+
+
+@router.post("/{tree_id}/gedcom/import", response_model=ImportReport)
+async def import_gedcom(
+    tree_id: uuid.UUID,
+    session: SessionDep,
+    current: CurrentUser,
+    file: UploadFile = File(...),
+) -> ImportReport:
+    # NOTE: additive — records are created as new; existing people are not merged.
+    tree = await tree_service.get_tree(session, viewer_id=current.id, tree_id=tree_id)
+    text = (await file.read()).decode("utf-8", errors="replace")
+    report = await gedcom.import_gedcom(session, actor=current, tree=tree, text=text)
+    return ImportReport(**report)
+
+
+@router.get("/{tree_id}/gedcom/export")
+async def export_gedcom(
+    tree_id: uuid.UUID, session: SessionDep, current: CurrentUser
+) -> Response:
+    tree = await tree_service.get_tree(session, viewer_id=current.id, tree_id=tree_id)
+    text = await gedcom.export_gedcom(session, viewer_id=current.id, tree=tree)
+    safe = "".join(c for c in tree.name if c.isalnum() or c in " -_").strip() or "tree"
+    return Response(
+        content=text,
+        media_type="text/plain",
+        headers={"Content-Disposition": f'attachment; filename="{safe}.ged"'},
+    )