Include extra also on transaction abort messages.

docs/database.md

@@ -242,7 +242,8 @@ def resolve_user_key(value: str) -> str | None:
   emitters can reuse as-is or replace piecemeal:
   - `event.header` — a lazy property producing the default one-line header
     for any kind: `<action>[ <extra>][ by <user>]` for changes,
-    `<action>[ by <user>] transaction aborted: <error>` for aborts, and the
+    `<action>[ <extra>][ by <user>] transaction aborted: <error>` for aborts,
+    and the
     plain `Created`/`Migrated` summaries.  It is settable: assign
     `event.header = ...` and return truthy to restyle the header while
     keeping the default diff routing.

kanta/logging.py

@@ -74,8 +74,9 @@ class LogEvent(msgspec.Struct, kw_only=True):
         """The default one-line header for this event, built on first access.
 
         Covers every event kind: ``"<action>[ <extra>][ by <user>]"`` for
-        changes, ``"<action>[ by <user>] transaction aborted: <error>"`` for
-        aborts, and the plain ``Created``/``Migrated`` summaries.
+        changes, ``"<action>[ <extra>][ by <user>] transaction aborted:
+        <error>"`` for aborts, and the plain ``Created``/``Migrated``
+        summaries.
         """
         if self._header is None:
             self._header = self._build_header()
@@ -102,6 +103,8 @@ class LogEvent(msgspec.Struct, kw_only=True):
         if self.kind == "change":
             return format_action_header(self.action or "", self.user, self.extra)
         line = Line().action(self.action or "")
+        if self.extra:
+            line(" ").target(self.extra)
         if self.user:
             line(" by ").user(self.user)
         line(f" transaction aborted: {self.error}")

kanta/transaction.py

@@ -124,6 +124,7 @@ def transaction(
                 kanta=impl._kanta,
                 action=action,
                 user=resolved_user,
+                extra=extra,
                 error=exc,
             ),
             impl.callback_registry.logemit_handlers,

tests/test_logemit.py

@@ -282,12 +282,13 @@ async def test_aborted_transaction_includes_resolved_user(
     await kanta.open()
     with caplog.at_level(logging.WARNING, logger="kanta.transaction"):
         with pytest.raises(ValueError):
-            with kanta.transaction(action="reset", user="u1") as data:
+            with kanta.transaction(action="reset", user="u1", extra="exp") as data:
                 data.counter = 99
                 raise ValueError("boom")
     await kanta.close()
 
     messages = [r.getMessage() for r in caplog.records if r.levelno == logging.WARNING]
+    assert any("exp" in m for m in messages)
     assert any(" by " in m and "Alice" in m for m in messages)
     assert any(" transaction aborted: boom" in m for m in messages)