Закрыты задачи бэклога по неочевидному поведению UI при ошибках отправки сообщений и блокировках со стороны Message-safety + добалено ограничение на размер сообщения

codebase/backend/api-backend/alembic/versions/0009_chat_message_max_length.py

@@ -0,0 +1,33 @@
+"""Seed configurable maximum chat message length.
+
+Revision ID: 0009_chat_message_max
+Revises: 0008_notifications_v1
+Create Date: 2026-07-29
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+revision: str = "0009_chat_message_max"
+down_revision: str | None = "0008_notifications_v1"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.execute(
+        """
+        INSERT INTO han_app.app_settings
+            (setting_key, setting_value, value_type, is_public, description,
+             record_status, updated_at)
+        VALUES
+            ('chat.message.max_length', '4000', 'integer', true,
+             'Maximum normalized client chat message length', 'A', now())
+        ON CONFLICT (setting_key) DO NOTHING
+        """
+    )
+
+
+def downgrade() -> None:
+    raise RuntimeError("Chat message maximum length migration is forward-only")