test: rename SearchSpace -> Workspace across tests + fixtures (Phase 2 Wave F)

Apply the same rename to surfsense_backend/tests: workspace_id fields/vars,
Workspace* classes/schemas, table name searchspaces -> workspaces in raw SQL,
and the API URL spellings -> /workspaces. Preserves the carve-out wire literals
tests assert (Celery task names, OTel key "search_space.id").

surfsense_backend/tests/unit/middleware/test_b_filesystem_rm_rmdir_cloud.py

@@ -39,11 +39,11 @@ pytestmark = pytest.mark.unit
 
 def _make_middleware(mode: FilesystemMode = FilesystemMode.CLOUD):
     selection = FilesystemSelection(mode=mode)
-    resolver = build_backend_resolver(selection, search_space_id=1)
+    resolver = build_backend_resolver(selection, workspace_id=1)
     return build_filesystem_mw(
         backend_resolver=resolver,
         filesystem_mode=mode,
-        search_space_id=1,
+        workspace_id=1,
         user_id="00000000-0000-0000-0000-000000000001",
         thread_id=1,
     )
@@ -290,7 +290,7 @@ class TestKBPostgresBackendDeleteFilter:
 
     def _make_backend(self, state: dict[str, Any]) -> KBPostgresBackend:
         runtime = SimpleNamespace(state=state)
-        return KBPostgresBackend(search_space_id=1, runtime=runtime)
+        return KBPostgresBackend(workspace_id=1, runtime=runtime)
 
     def test_pending_filesystem_view_returns_deleted_paths(self):
         backend = self._make_backend(

surfsense_backend/tests/unit/middleware/test_filesystem_backends.py

@@ -38,16 +38,16 @@ def test_backend_resolver_returns_multi_root_backend_for_single_root(tmp_path: P
 def test_backend_resolver_uses_cloud_mode_by_default():
     resolver = build_backend_resolver(FilesystemSelection())
     backend = resolver(_RuntimeStub())
-    # When no search_space_id is provided we fall back to StateBackend so
+    # When no workspace_id is provided we fall back to StateBackend so
     # sub-agents / tests without DB access still work.
     assert backend.__class__.__name__ == "StateBackend"
 
 
-def test_backend_resolver_uses_kb_postgres_in_cloud_with_search_space():
-    resolver = build_backend_resolver(FilesystemSelection(), search_space_id=42)
+def test_backend_resolver_uses_kb_postgres_in_cloud_with_workspace():
+    resolver = build_backend_resolver(FilesystemSelection(), workspace_id=42)
     backend = resolver(_RuntimeStub())
     assert backend.__class__.__name__ == "KBPostgresBackend"
-    assert backend.search_space_id == 42
+    assert backend.workspace_id == 42
 
 
 def test_backend_resolver_returns_multi_root_backend_for_multiple_roots(tmp_path: Path):

surfsense_backend/tests/unit/middleware/test_kb_persistence_filesystem_parity.py

@@ -92,7 +92,7 @@ async def test_create_document_allows_identical_content_at_different_paths() ->
         session,  # type: ignore[arg-type]
         virtual_path="/documents/a/notes.md",
         content=content,
-        search_space_id=42,
+        workspace_id=42,
         created_by_id="user-1",
     )
     assert isinstance(first, Document)
@@ -104,7 +104,7 @@ async def test_create_document_allows_identical_content_at_different_paths() ->
         session,  # type: ignore[arg-type]
         virtual_path="/documents/b/notes-copy.md",
         content=content,
-        search_space_id=42,
+        workspace_id=42,
         created_by_id="user-1",
     )
     assert isinstance(second, Document)
@@ -121,7 +121,7 @@ async def test_create_document_still_rejects_path_collision() -> None:
     """Path uniqueness remains the hard invariant.
 
     If ``unique_identifier_hash`` already points at an existing row in
-    the same search space, the create call must raise ``ValueError``
+    the same workspace, the create call must raise ``ValueError``
     with a clear message — matching the behavior the commit loop relies
     on to upsert via the existing-row code path.
     """
@@ -137,7 +137,7 @@ async def test_create_document_still_rejects_path_collision() -> None:
             session,  # type: ignore[arg-type]
             virtual_path="/documents/notes.md",
             content="anything",
-            search_space_id=42,
+            workspace_id=42,
             created_by_id="user-1",
         )
 
@@ -160,7 +160,7 @@ async def test_create_document_does_not_query_for_content_hash_collision(
         session,  # type: ignore[arg-type]
         virtual_path="/documents/notes.md",
         content="hello",
-        search_space_id=42,
+        workspace_id=42,
         created_by_id="user-1",
     )
     # Path-collision SELECT only. No content_hash SELECT.

surfsense_backend/tests/unit/middleware/test_kb_persistence_revisions.py

@@ -217,7 +217,7 @@ async def test_pre_write_snapshot_defers_dispatch_when_list_provided(
         session,  # type: ignore[arg-type]
         doc=doc,
         action_id=42,
-        search_space_id=1,
+        workspace_id=1,
         turn_id="t-1",
         deferred_dispatches=deferred,
     )
@@ -262,7 +262,7 @@ async def test_pre_write_snapshot_dispatches_inline_when_list_omitted(
         session,  # type: ignore[arg-type]
         doc=doc,
         action_id=88,
-        search_space_id=1,
+        workspace_id=1,
         turn_id="t-1",
         # No deferred_dispatches arg — fall back to inline dispatch.
     )
@@ -302,7 +302,7 @@ async def test_pre_mkdir_snapshot_defers_dispatch_when_list_provided(
         session,  # type: ignore[arg-type]
         folder=folder,
         action_id=55,
-        search_space_id=1,
+        workspace_id=1,
         turn_id="t-1",
         deferred_dispatches=deferred,
     )

surfsense_backend/tests/unit/middleware/test_kb_postgres_read.py

@@ -28,7 +28,7 @@ pytestmark = pytest.mark.unit
 
 
 def _backend(state: dict) -> KBPostgresBackend:
-    return KBPostgresBackend(search_space_id=1, runtime=SimpleNamespace(state=state))
+    return KBPostgresBackend(workspace_id=1, runtime=SimpleNamespace(state=state))
 
 
 def test_render_full_document_uses_full_view_and_registers() -> None:

surfsense_backend/tests/unit/middleware/test_knowledge_tree.py

@@ -101,7 +101,7 @@ class TestFormatTreeRendering:
         docs = [_Row(**spec) for spec in doc_specs]
 
         mw = KnowledgeTreeMiddleware(
-            search_space_id=1,
+            workspace_id=1,
             filesystem_mode=None,  # type: ignore[arg-type]
         )
         return mw._format_tree(index, docs)