Add fuzzy name search (pg_trgm) and living-person protection

Fuzzy search: pg_trgm extension + trigram GIN indexes on name parts and a GET /trees/{id}/persons?q= search ranked by trigram similarity (finds Mueller for 'muller'), privacy-filtered. Living-person protection: the privacy engine now derives possibly-living status (explicit flag, else no death fact + birth within ~100y or unknown) and returns 'redacted' for non-members of public/unlisted trees; the service minimises those records ('Living person', no vitals). Members are unaffected. 31 tests pass.

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

backend/app/services/person_service.py

@@ -6,7 +6,7 @@ person through the privacy engine. Each returned Person gets a transient
 import uuid
 from datetime import UTC, datetime
 
-from sqlalchemy import select
+from sqlalchemy import func, or_, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.enums import PersonPrivacy
@@ -25,6 +25,14 @@ def _format_name(name: Name) -> str | None:
     return joined or name.display_name
 
 
+def _redact(person: Person) -> None:
+    """Minimise a possibly-living person for a non-member view (transient only —
+    never committed)."""
+    person.primary_name = "Living person"
+    person.gender = None
+    person.is_living = True
+
+
 async def _attach_primary_name(session: AsyncSession, person: Person) -> None:
     stmt = (
         select(Name)
@@ -104,12 +112,15 @@ async def get_person(
     if person is None:
         raise NotFound("person not found")
     # Run the single person through the privacy engine (redaction lands Phase 2).
-    if (
-        await privacy.person_visibility(session, user_id=viewer_id, tree=tree, person=person)
-        == Visibility.hidden
-    ):
+    vis = await privacy.person_visibility(
+        session, user_id=viewer_id, tree=tree, person=person
+    )
+    if vis == Visibility.hidden:
         raise NotFound("person not found")
-    await _attach_primary_name(session, person)
+    if vis == Visibility.redacted:
+        _redact(person)
+    else:
+        await _attach_primary_name(session, person)
     return person
 
 
@@ -199,13 +210,66 @@ async def list_persons(
 
     visible: list[Person] = []
     for person in persons:
-        if (
-            await privacy.person_visibility(
-                session, user_id=viewer_id, tree=tree, person=person
-            )
-            == Visibility.hidden
-        ):
+        vis = await privacy.person_visibility(
+            session, user_id=viewer_id, tree=tree, person=person
+        )
+        if vis == Visibility.hidden:
             continue
-        await _attach_primary_name(session, person)
+        if vis == Visibility.redacted:
+            _redact(person)
+        else:
+            await _attach_primary_name(session, person)
         visible.append(person)
     return visible
+
+
+async def search_persons(
+    session: AsyncSession, *, viewer_id: uuid.UUID, tree: Tree, query: str, limit: int = 50
+) -> list[Person]:
+    if not await privacy.can_view_tree(session, user_id=viewer_id, tree=tree):
+        raise Forbidden("not permitted to view this tree")
+    q = query.strip()
+    if not q:
+        return []
+    like = f"%{q}%"
+    score = func.greatest(
+        func.similarity(func.coalesce(Name.given, ""), q),
+        func.similarity(func.coalesce(Name.surname, ""), q),
+    )
+    sub = (
+        select(Name.person_id.label("pid"), func.max(score).label("score"))
+        .where(
+            Name.tree_id == tree.id,
+            Name.deleted_at.is_(None),
+            or_(
+                Name.given.op("%")(q),
+                Name.surname.op("%")(q),
+                Name.given.ilike(like),
+                Name.surname.ilike(like),
+            ),
+        )
+        .group_by(Name.person_id)
+        .order_by(func.max(score).desc())
+        .limit(limit)
+        .subquery()
+    )
+    stmt = (
+        select(Person)
+        .join(sub, sub.c.pid == Person.id)
+        .where(Person.tree_id == tree.id, Person.deleted_at.is_(None))
+        .order_by(sub.c.score.desc())
+    )
+    persons = list((await session.execute(stmt)).scalars().all())
+    out: list[Person] = []
+    for person in persons:
+        vis = await privacy.person_visibility(
+            session, user_id=viewer_id, tree=tree, person=person
+        )
+        if vis == Visibility.hidden:
+            continue
+        if vis == Visibility.redacted:
+            _redact(person)
+        else:
+            await _attach_primary_name(session, person)
+        out.append(person)
+    return out