feat: add alembic migration for BOOKSTACK_CONNECTOR enum

surfsense_backend/alembic/versions/39_add_bookstack_connector_enums.py

@@ -0,0 +1,61 @@
+"""Add BOOKSTACK_CONNECTOR to enums
+
+Revision ID: 39
+Revises: 38
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "39"
+down_revision: str | None = "38"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Safely add 'BOOKSTACK_CONNECTOR' to enum types if missing."""
+
+    # Add to searchsourceconnectortype enum
+    op.execute(
+        """
+    DO $$
+    BEGIN
+        IF NOT EXISTS (
+            SELECT 1 FROM pg_type t
+            JOIN pg_enum e ON t.oid = e.enumtypid
+            WHERE t.typname = 'searchsourceconnectortype' AND e.enumlabel = 'BOOKSTACK_CONNECTOR'
+        ) THEN
+            ALTER TYPE searchsourceconnectortype ADD VALUE 'BOOKSTACK_CONNECTOR';
+        END IF;
+    END
+    $$;
+    """
+    )
+
+    # Add to documenttype enum
+    op.execute(
+        """
+    DO $$
+    BEGIN
+        IF NOT EXISTS (
+            SELECT 1 FROM pg_type t
+            JOIN pg_enum e ON t.oid = e.enumtypid
+            WHERE t.typname = 'documenttype' AND e.enumlabel = 'BOOKSTACK_CONNECTOR'
+        ) THEN
+            ALTER TYPE documenttype ADD VALUE 'BOOKSTACK_CONNECTOR';
+        END IF;
+    END
+    $$;
+    """
+    )
+
+
+def downgrade() -> None:
+    """
+    Downgrade logic not implemented since PostgreSQL
+    does not support removing enum values.
+    """
+    pass