backend/app/api/v1/citations.py

@@ -3,7 +3,7 @@ import uuid
 from fastapi import APIRouter, status
 
 from app.api.deps import CurrentUser, SessionDep
-from app.schemas.source import CitationCreate, CitationRead
+from app.schemas.source import CitationCreate, CitationRead, CitationUpdate
 from app.services import citation_service, tree_service
 
 router = APIRouter(prefix="/trees", tags=["citations"])
@@ -31,6 +31,25 @@ async def list_citations(
     return [CitationRead.model_validate(c) for c in citations]
 
 
+@router.patch("/{tree_id}/citations/{citation_id}", response_model=CitationRead)
+async def update_citation(
+    tree_id: uuid.UUID,
+    citation_id: uuid.UUID,
+    data: CitationUpdate,
+    session: SessionDep,
+    current: CurrentUser,
+) -> CitationRead:
+    tree = await tree_service.get_tree(session, viewer_id=current.id, tree_id=tree_id)
+    citation = await citation_service.update_citation(
+        session,
+        actor=current,
+        tree=tree,
+        citation_id=citation_id,
+        changes=data.model_dump(exclude_unset=True),
+    )
+    return CitationRead.model_validate(citation)
+
+
 @router.delete("/{tree_id}/citations/{citation_id}", status_code=status.HTTP_204_NO_CONTENT)
 async def delete_citation(
     tree_id: uuid.UUID, citation_id: uuid.UUID, session: SessionDep, current: CurrentUser

backend/app/api/v1/media.py

@@ -3,7 +3,7 @@ import uuid
 from fastapi import APIRouter, File, Form, Response, UploadFile, status
 
 from app.api.deps import CurrentUser, ObjectStoreDep, SessionDep
-from app.schemas.media import MediaRead
+from app.schemas.media import MediaRead, MediaUpdate
 from app.services import media_service, tree_service
 
 
@@ -81,6 +81,26 @@ async def media_content(
     )
 
 
+@router.patch("/{tree_id}/media/{media_id}", response_model=MediaRead)
+async def update_media(
+    tree_id: uuid.UUID,
+    media_id: uuid.UUID,
+    data: MediaUpdate,
+    session: SessionDep,
+    current: CurrentUser,
+    store: ObjectStoreDep,
+) -> MediaRead:
+    tree = await tree_service.get_tree(session, viewer_id=current.id, tree_id=tree_id)
+    media = await media_service.update_media(
+        session,
+        actor=current,
+        tree=tree,
+        media_id=media_id,
+        changes=data.model_dump(exclude_unset=True),
+    )
+    return _read(media)
+
+
 @router.delete("/{tree_id}/media/{media_id}", status_code=status.HTTP_204_NO_CONTENT)
 async def delete_media(
     tree_id: uuid.UUID, media_id: uuid.UUID, session: SessionDep, current: CurrentUser

backend/app/api/v1/relationships.py

@@ -3,7 +3,7 @@ import uuid
 from fastapi import APIRouter, status
 
 from app.api.deps import CurrentUser, SessionDep
-from app.schemas.relationship import RelationshipCreate, RelationshipRead
+from app.schemas.relationship import RelationshipCreate, RelationshipRead, RelationshipUpdate
 from app.services import relationship_service, tree_service
 
 router = APIRouter(prefix="/trees", tags=["relationships"])
@@ -47,6 +47,25 @@ async def list_person_relationships(
     return [RelationshipRead.model_validate(r) for r in rels]
 
 
+@router.patch("/{tree_id}/relationships/{relationship_id}", response_model=RelationshipRead)
+async def update_relationship(
+    tree_id: uuid.UUID,
+    relationship_id: uuid.UUID,
+    data: RelationshipUpdate,
+    session: SessionDep,
+    current: CurrentUser,
+) -> RelationshipRead:
+    tree = await tree_service.get_tree(session, viewer_id=current.id, tree_id=tree_id)
+    rel = await relationship_service.update_relationship(
+        session,
+        actor=current,
+        tree=tree,
+        relationship_id=relationship_id,
+        changes=data.model_dump(exclude_unset=True),
+    )
+    return RelationshipRead.model_validate(rel)
+
+
 @router.delete(
     "/{tree_id}/relationships/{relationship_id}", status_code=status.HTTP_204_NO_CONTENT
 )

backend/app/api/v1/sources.py

@@ -3,7 +3,7 @@ import uuid
 from fastapi import APIRouter, status
 
 from app.api.deps import CurrentUser, SessionDep
-from app.schemas.source import SourceCreate, SourceRead
+from app.schemas.source import SourceCreate, SourceRead, SourceUpdate
 from app.services import source_service, tree_service
 
 router = APIRouter(prefix="/trees", tags=["sources"])
@@ -40,6 +40,25 @@ async def get_source(
     return SourceRead.model_validate(source)
 
 
+@router.patch("/{tree_id}/sources/{source_id}", response_model=SourceRead)
+async def update_source(
+    tree_id: uuid.UUID,
+    source_id: uuid.UUID,
+    data: SourceUpdate,
+    session: SessionDep,
+    current: CurrentUser,
+) -> SourceRead:
+    tree = await tree_service.get_tree(session, viewer_id=current.id, tree_id=tree_id)
+    source = await source_service.update_source(
+        session,
+        actor=current,
+        tree=tree,
+        source_id=source_id,
+        changes=data.model_dump(exclude_unset=True),
+    )
+    return SourceRead.model_validate(source)
+
+
 @router.delete("/{tree_id}/sources/{source_id}", status_code=status.HTTP_204_NO_CONTENT)
 async def delete_source(
     tree_id: uuid.UUID, source_id: uuid.UUID, session: SessionDep, current: CurrentUser

backend/app/api/v1/trees.py

@@ -3,7 +3,7 @@ import uuid
 from fastapi import APIRouter, status
 
 from app.api.deps import CurrentUser, SessionDep
-from app.schemas.tree import TreeCreate, TreeRead
+from app.schemas.tree import TreeCreate, TreeRead, TreeUpdate
 from app.services import tree_service
 
 router = APIRouter(prefix="/trees", tags=["trees"])
@@ -38,6 +38,16 @@ async def get_tree(tree_id: uuid.UUID, session: SessionDep, current: CurrentUser
     return TreeRead.model_validate(tree)
 
 
+@router.patch("/{tree_id}", response_model=TreeRead)
+async def update_tree(
+    tree_id: uuid.UUID, data: TreeUpdate, session: SessionDep, current: CurrentUser
+) -> TreeRead:
+    tree = await tree_service.update_tree(
+        session, actor=current, tree_id=tree_id, changes=data.model_dump(exclude_unset=True)
+    )
+    return TreeRead.model_validate(tree)
+
+
 @router.delete("/{tree_id}", status_code=status.HTTP_204_NO_CONTENT)
 async def delete_tree(tree_id: uuid.UUID, session: SessionDep, current: CurrentUser) -> None:
     await tree_service.delete_tree(session, actor=current, tree_id=tree_id)

backend/app/schemas/media.py

@@ -4,6 +4,13 @@ from datetime import datetime
 from pydantic import BaseModel, ConfigDict
 
 
+class MediaUpdate(BaseModel):
+    title: str | None = None
+    person_id: uuid.UUID | None = None
+    event_id: uuid.UUID | None = None
+    source_id: uuid.UUID | None = None
+
+
 class MediaRead(BaseModel):
     model_config = ConfigDict(from_attributes=True)
 

backend/app/schemas/relationship.py

@@ -15,6 +15,11 @@ class RelationshipCreate(BaseModel):
     notes: str | None = None
 
 
+class RelationshipUpdate(BaseModel):
+    qualifier: ParentChildQualifier | None = None
+    notes: str | None = None
+
+
 class RelationshipRead(BaseModel):
     model_config = ConfigDict(from_attributes=True)
 

backend/app/schemas/source.py

@@ -33,6 +33,23 @@ class SourceRead(BaseModel):
     created_at: datetime
 
 
+class SourceUpdate(BaseModel):
+    title: str | None = None
+    author: str | None = None
+    source_type: str | None = None
+    repository: str | None = None
+    url: str | None = None
+    citation_text: str | None = None
+    publication_info: str | None = None
+    quality_note: str | None = None
+
+
+class CitationUpdate(BaseModel):
+    page: str | None = None
+    detail: str | None = None
+    confidence: CitationConfidence | None = None
+
+
 class CitationCreate(BaseModel):
     source_id: uuid.UUID
     # Exactly one target fact.

backend/app/schemas/tree.py

@@ -12,6 +12,12 @@ class TreeCreate(BaseModel):
     visibility: TreeVisibility = TreeVisibility.private
 
 
+class TreeUpdate(BaseModel):
+    name: str | None = None
+    description: str | None = None
+    visibility: TreeVisibility | None = None
+
+
 class TreeRead(BaseModel):
     model_config = ConfigDict(from_attributes=True)
 

backend/app/services/citation_service.py

@@ -113,6 +113,38 @@ async def list_citations(
     return list((await session.execute(stmt)).scalars().all())
 
 
+async def update_citation(
+    session: AsyncSession, *, actor: User, tree: Tree, citation_id: uuid.UUID, changes: dict
+) -> Citation:
+    if not await privacy.can_edit_tree(session, user_id=actor.id, tree=tree):
+        raise Forbidden("not an editor of this tree")
+    citation = (
+        await session.execute(
+            select(Citation).where(
+                Citation.id == citation_id,
+                Citation.tree_id == tree.id,
+                Citation.deleted_at.is_(None),
+            )
+        )
+    ).scalar_one_or_none()
+    if citation is None:
+        raise NotFound("citation not found")
+    for key in {"page", "detail", "confidence"} & changes.keys():
+        setattr(citation, key, changes[key])
+    record_audit(
+        session,
+        action="update",
+        entity_type="Citation",
+        entity_id=citation.id,
+        tree_id=tree.id,
+        actor_user_id=actor.id,
+        after=changes,
+    )
+    await session.commit()
+    await session.refresh(citation)
+    return citation
+
+
 async def delete_citation(
     session: AsyncSession, *, actor: User, tree: Tree, citation_id: uuid.UUID
 ) -> None:

backend/app/services/media_service.py

@@ -97,6 +97,36 @@ async def get_media(
     return media
 
 
+async def update_media(
+    session: AsyncSession, *, actor: User, tree: Tree, media_id: uuid.UUID, changes: dict
+) -> Media:
+    if not await privacy.can_edit_tree(session, user_id=actor.id, tree=tree):
+        raise Forbidden("not an editor of this tree")
+    media = (
+        await session.execute(
+            select(Media).where(
+                Media.id == media_id, Media.tree_id == tree.id, Media.deleted_at.is_(None)
+            )
+        )
+    ).scalar_one_or_none()
+    if media is None:
+        raise NotFound("media not found")
+    for key in {"title", "person_id", "event_id", "source_id"} & changes.keys():
+        setattr(media, key, changes[key])
+    record_audit(
+        session,
+        action="update",
+        entity_type="Media",
+        entity_id=media.id,
+        tree_id=tree.id,
+        actor_user_id=actor.id,
+        after=changes,
+    )
+    await session.commit()
+    await session.refresh(media)
+    return media
+
+
 async def delete_media(
     session: AsyncSession, *, actor: User, tree: Tree, media_id: uuid.UUID
 ) -> None:

backend/app/services/relationship_service.py

@@ -107,6 +107,44 @@ async def list_relationships_for_person(
     return list((await session.execute(stmt)).scalars().all())
 
 
+async def update_relationship(
+    session: AsyncSession, *, actor: User, tree: Tree, relationship_id: uuid.UUID, changes: dict
+) -> Relationship:
+    if not await privacy.can_edit_tree(session, user_id=actor.id, tree=tree):
+        raise Forbidden("not an editor of this tree")
+    relationship = (
+        await session.execute(
+            select(Relationship).where(
+                Relationship.id == relationship_id,
+                Relationship.tree_id == tree.id,
+                Relationship.deleted_at.is_(None),
+            )
+        )
+    ).scalar_one_or_none()
+    if relationship is None:
+        raise NotFound("relationship not found")
+    if (
+        "qualifier" in changes
+        and changes["qualifier"] is not None
+        and relationship.type is not RelationshipType.parent_child
+    ):
+        raise Conflict("qualifier only applies to parent_child relationships")
+    for key in {"qualifier", "notes"} & changes.keys():
+        setattr(relationship, key, changes[key])
+    record_audit(
+        session,
+        action="update",
+        entity_type="Relationship",
+        entity_id=relationship.id,
+        tree_id=tree.id,
+        actor_user_id=actor.id,
+        after=changes,
+    )
+    await session.commit()
+    await session.refresh(relationship)
+    return relationship
+
+
 async def delete_relationship(
     session: AsyncSession, *, actor: User, tree: Tree, relationship_id: uuid.UUID
 ) -> None:

backend/app/services/source_service.py

@@ -86,6 +86,42 @@ async def get_source(
     return source
 
 
+_SOURCE_FIELDS = {
+    "title", "author", "source_type", "repository", "url", "citation_text",
+    "publication_info", "quality_note",
+}
+
+
+async def update_source(
+    session: AsyncSession, *, actor: User, tree: Tree, source_id: uuid.UUID, changes: dict
+) -> Source:
+    if not await privacy.can_edit_tree(session, user_id=actor.id, tree=tree):
+        raise Forbidden("not an editor of this tree")
+    source = (
+        await session.execute(
+            select(Source).where(
+                Source.id == source_id, Source.tree_id == tree.id, Source.deleted_at.is_(None)
+            )
+        )
+    ).scalar_one_or_none()
+    if source is None:
+        raise NotFound("source not found")
+    for key in _SOURCE_FIELDS & changes.keys():
+        setattr(source, key, changes[key])
+    record_audit(
+        session,
+        action="update",
+        entity_type="Source",
+        entity_id=source.id,
+        tree_id=tree.id,
+        actor_user_id=actor.id,
+        after=changes,
+    )
+    await session.commit()
+    await session.refresh(source)
+    return source
+
+
 async def delete_source(
     session: AsyncSession, *, actor: User, tree: Tree, source_id: uuid.UUID
 ) -> None:

backend/app/services/tree_service.py

@@ -62,6 +62,30 @@ async def get_tree(session: AsyncSession, *, viewer_id: uuid.UUID, tree_id: uuid
     return tree
 
 
+async def update_tree(
+    session: AsyncSession, *, actor: User, tree_id: uuid.UUID, changes: dict
+) -> Tree:
+    tree = await BaseRepository(session, Tree).get(tree_id)
+    if tree is None:
+        raise NotFound("tree not found")
+    if not await privacy.can_edit_tree(session, user_id=actor.id, tree=tree):
+        raise Forbidden("not an editor of this tree")
+    for key in {"name", "description", "visibility"} & changes.keys():
+        setattr(tree, key, changes[key])
+    record_audit(
+        session,
+        action="update",
+        entity_type="Tree",
+        entity_id=tree.id,
+        tree_id=tree.id,
+        actor_user_id=actor.id,
+        after=changes,
+    )
+    await session.commit()
+    await session.refresh(tree)
+    return tree
+
+
 async def _owned_tree(session: AsyncSession, *, actor: User, tree_id: uuid.UUID) -> Tree:
     """Load a tree (including soft-deleted) and require the actor be its owner."""
     tree = await BaseRepository(session, Tree).get(tree_id, include_deleted=True)

backend/tests/test_crud_updates.py

@@ -0,0 +1,79 @@
+"""Update (the U in CRUD) for the remaining entities — rule #8."""
+
+from tests.conftest import auth, register
+
+
+async def _setup(client, email):
+    h = auth(await register(client, email))
+    tid = (await client.post("/api/v1/trees", json={"name": "T"}, headers=h)).json()["id"]
+    return h, tid
+
+
+async def test_tree_update(client):
+    h, tid = await _setup(client, "u-tree@example.com")
+    r = await client.patch(
+        f"/api/v1/trees/{tid}", json={"name": "Renamed", "visibility": "unlisted"}, headers=h
+    )
+    assert r.status_code == 200
+    assert r.json()["name"] == "Renamed" and r.json()["visibility"] == "unlisted"
+
+
+async def test_source_update(client):
+    h, tid = await _setup(client, "u-src@example.com")
+    sid = (
+        await client.post(f"/api/v1/trees/{tid}/sources", json={"title": "Old"}, headers=h)
+    ).json()["id"]
+    r = await client.patch(
+        f"/api/v1/trees/{tid}/sources/{sid}",
+        json={"title": "New", "repository": "NARA"},
+        headers=h,
+    )
+    assert r.status_code == 200
+    assert r.json()["title"] == "New" and r.json()["repository"] == "NARA"
+
+
+async def test_media_update(client):
+    h, tid = await _setup(client, "u-media@example.com")
+    mid = (
+        await client.post(
+            f"/api/v1/trees/{tid}/media",
+            files={"file": ("a.txt", b"x", "text/plain")},
+            data={"title": "old"},
+            headers=h,
+        )
+    ).json()["id"]
+    r = await client.patch(f"/api/v1/trees/{tid}/media/{mid}", json={"title": "new"}, headers=h)
+    assert r.status_code == 200 and r.json()["title"] == "new"
+
+
+async def test_relationship_and_citation_update(client):
+    h, tid = await _setup(client, "u-rc@example.com")
+
+    async def mk(path, body):
+        return (await client.post(f"/api/v1/trees/{tid}/{path}", json=body, headers=h)).json()["id"]
+
+    p1 = await mk("persons", {"given": "A"})
+    p2 = await mk("persons", {"given": "B"})
+    rid = await mk(
+        "relationships",
+        {
+            "type": "parent_child",
+            "person_from_id": p1,
+            "person_to_id": p2,
+            "qualifier": "biological",
+        },
+    )
+    r = await client.patch(
+        f"/api/v1/trees/{tid}/relationships/{rid}", json={"qualifier": "adoptive"}, headers=h
+    )
+    assert r.status_code == 200 and r.json()["qualifier"] == "adoptive"
+
+    src = await mk("sources", {"title": "S"})
+    cid = await mk("citations", {"source_id": src, "person_id": p1})
+    r2 = await client.patch(
+        f"/api/v1/trees/{tid}/citations/{cid}",
+        json={"page": "p.7", "confidence": "high"},
+        headers=h,
+    )
+    assert r2.status_code == 200
+    assert r2.json()["page"] == "p.7" and r2.json()["confidence"] == "high"