Make Vision LLM opt-in for uploads and connectors

surfsense_backend/alembic/versions/121_add_enable_vision_llm_to_connectors.py

@@ -0,0 +1,45 @@
+"""121_add_enable_vision_llm_to_connectors
+
+Revision ID: 121
+Revises: 120
+Create Date: 2026-04-09
+
+Adds enable_vision_llm boolean column to search_source_connectors.
+Defaults to False so vision LLM image processing is opt-in.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "121"
+down_revision: str | None = "120"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    existing_columns = [
+        col["name"] for col in sa.inspect(conn).get_columns("search_source_connectors")
+    ]
+
+    if "enable_vision_llm" not in existing_columns:
+        op.add_column(
+            "search_source_connectors",
+            sa.Column(
+                "enable_vision_llm",
+                sa.Boolean(),
+                nullable=False,
+                server_default=sa.text("false"),
+            ),
+        )
+
+
+def downgrade() -> None:
+    op.drop_column("search_source_connectors", "enable_vision_llm")