fix(faq): repair category schema and icons

backend/alembic/versions/20260608_01_add_faq_category_icon.py

@@ -0,0 +1,36 @@
+"""add faq category icon column
+
+Revision ID: 20260608_01
+Revises: 20260529_04
+Create Date: 2026-06-08 14:30:00.000000
+
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260608_01"
+down_revision: Union[str, None] = "20260529_04"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def _column_exists(inspector: sa.Inspector, table_name: str, column_name: str) -> bool:
+    return any(column["name"] == column_name for column in inspector.get_columns(table_name))
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    if "faq_categories" in inspector.get_table_names() and not _column_exists(inspector, "faq_categories", "icon"):
+        op.add_column("faq_categories", sa.Column("icon", sa.String(length=30), nullable=True))
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    if "faq_categories" in inspector.get_table_names() and _column_exists(inspector, "faq_categories", "icon"):
+        op.drop_column("faq_categories", "icon")