fix(api): retarget holidays per account and ship App Home changelog (PLAT-216)

.dockerignore

@@ -6,6 +6,7 @@ terraform
 tests
 docs
 *.md
+!src/slack-bot/CHANGELOG.md
 __pycache__
 .pytest_cache
 .mypy_cache

scripts/cutover/retarget_holiday_schedules_to_sqs.py

@@ -21,6 +21,7 @@ from botocore.exceptions import ClientError
 
 PROD_ACCOUNT = "011934824531"
 DEV_ACCOUNT = "710827005802"
+HOLIDAY_SCHEDULER_ROLE = "afterhours-shift-manager-holiday-scheduler"
 PREFIXES = ("holiday-activate-", "holiday-deactivate-")
 _AT = re.compile(r"^at\((\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2})\)$")
 _DATE = re.compile(r"(\d{4}-\d{2}-\d{2})")
@@ -78,6 +79,10 @@ def action_and_date(name: str, existing_input: str) -> tuple[str, str]:
     return action, date
 
 
+def holiday_scheduler_role_arn(account: str) -> str:
+    return f"arn:aws:iam::{account}:role/tf-managed/{HOLIDAY_SCHEDULER_ROLE}"
+
+
 def holiday_sqs_input(action: str, date: str) -> str:
     return json.dumps({"event": "holiday", "action": action, "date": date})
 
@@ -106,7 +111,8 @@ def main() -> int:
     parser.add_argument("--queue-arn", required=True)
     parser.add_argument(
         "--role-arn",
-        default="arn:aws:iam::011934824531:role/tf-managed/afterhours-shift-manager-holiday-scheduler",
+        default="",
+        help="Scheduler execution role. Empty uses the tf-managed holiday role in the caller account.",
     )
     parser.add_argument("--execute", action="store_true")
     args = parser.parse_args()
@@ -115,6 +121,7 @@ def main() -> int:
     if account not in {PROD_ACCOUNT, DEV_ACCOUNT}:
         print("profile is not seahaven-prod or seahaven-dev", file=sys.stderr)
         return 2
+    role_arn = args.role_arn.strip() or holiday_scheduler_role_arn(account)
 
     client = _client(args.profile, args.region)
     now = datetime.now(timezone.utc)
@@ -154,7 +161,7 @@ def main() -> int:
                 ActionAfterCompletion=detail.get("ActionAfterCompletion", "DELETE"),
                 Target={
                     "Arn": args.queue_arn,
-                    "RoleArn": args.role_arn,
+                    "RoleArn": role_arn,
                     "Input": payload,
                 },
             )

src/slack-bot/app.py

@@ -2168,19 +2168,31 @@ def _admin_holiday_list(respond, schedule):
 
 @functools.lru_cache(maxsize=1)
 def _changelog_text() -> str:
-    """Read the CHANGELOG shipped in this function's package.
+    """Read the CHANGELOG shipped next to this module.
 
     Lazy (never at import) and tolerant of a missing file, so the App Home tab
-    degrades to "no What's New section" rather than erroring. The copy lives at
-    ``$LAMBDA_TASK_ROOT/CHANGELOG.md`` (synced from the repo root).
+    degrades to "no What's New section" rather than erroring. Lambda zips and
+    the Fargate image both keep ``CHANGELOG.md`` beside ``app.py``.
+    ``LAMBDA_TASK_ROOT`` remains a fallback for the zip layout.
     """
-    path = os.path.join(os.environ.get("LAMBDA_TASK_ROOT", "."), "CHANGELOG.md")
-    try:
-        with open(path, encoding="utf-8") as fh:
-            return fh.read()
-    except OSError:
-        logger.warning("CHANGELOG.md not found at %s — App Home omits What's New", path)
-        return ""
+    tried = []
+    for path in _changelog_paths():
+        tried.append(path)
+        try:
+            with open(path, encoding="utf-8") as fh:
+                return fh.read()
+        except OSError:
+            continue
+    logger.warning("CHANGELOG.md not found at %s — App Home omits What's New", tried)
+    return ""
+
+
+def _changelog_paths() -> list[str]:
+    paths = [os.path.join(os.path.dirname(os.path.abspath(__file__)), "CHANGELOG.md")]
+    task_root = os.environ.get("LAMBDA_TASK_ROOT", "").strip()
+    if task_root:
+        paths.append(os.path.join(task_root, "CHANGELOG.md"))
+    return paths
 
 
 _HOME_OVERVIEW_DAYS = 60

tests/scripts/test_retarget_holiday_schedules_to_sqs.py

@@ -39,3 +39,14 @@ def test_action_and_date_from_schedule_name_when_input_empty():
 def test_holiday_sqs_input_shape():
     payload = mod.holiday_sqs_input("activate", "2026-07-04")
     assert payload == '{"event": "holiday", "action": "activate", "date": "2026-07-04"}'
+
+
+def test_holiday_scheduler_role_arn_follows_caller_account():
+    assert mod.holiday_scheduler_role_arn(mod.PROD_ACCOUNT) == (
+        "arn:aws:iam::011934824531:role/tf-managed/"
+        "afterhours-shift-manager-holiday-scheduler"
+    )
+    assert mod.holiday_scheduler_role_arn(mod.DEV_ACCOUNT) == (
+        "arn:aws:iam::710827005802:role/tf-managed/"
+        "afterhours-shift-manager-holiday-scheduler"
+    )

tests/slack_bot/test_app_home.py

@@ -42,6 +42,18 @@ def test_publish_home_publishes_latest_entry(slackbot_app, client):
     assert "v1.9.2" not in str(kwargs["view"])  # only the newest entry
 
 
+def test_changelog_paths_include_package_copy(slackbot_app):
+    paths = slackbot_app._changelog_paths()
+    assert any(p.endswith("src/slack-bot/CHANGELOG.md") for p in paths)
+
+
+def test_changelog_text_reads_package_copy(slackbot_app):
+    slackbot_app._changelog_text.cache_clear()
+    text = slackbot_app._changelog_text()
+    assert text
+    assert "## " in text
+
+
 def test_publish_home_degrades_without_changelog(slackbot_app, client):
     slackbot_app.publish_home(client, "U_BOB", "")
     view = client.views_publish.call_args.kwargs["view"]