feat(back): add SearxNG connector type

surfsense_backend/alembic/versions/26_add_searxng_connector_enum.py

@@ -0,0 +1,42 @@
+"""Add SearxNG connector enum value
+
+Revision ID: 26
+Revises: 25
+Create Date: 2025-01-18 00:00:00.000000
+
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "26"
+down_revision: str | None = "25"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Safely add SEARXNG_API to searchsourceconnectortype enum."""
+    op.execute(
+        """
+    DO $$
+    BEGIN
+        IF NOT EXISTS (
+            SELECT 1 FROM pg_type t
+            JOIN pg_enum e ON t.oid = e.enumtypid
+            WHERE t.typname = 'searchsourceconnectortype' AND e.enumlabel = 'SEARXNG_API'
+        ) THEN
+            ALTER TYPE searchsourceconnectortype ADD VALUE 'SEARXNG_API';
+        END IF;
+    END
+    $$;
+    """
+    )
+
+
+def downgrade() -> None:
+    """Downgrade not supported for enum edits."""
+    pass
+