feat: add guardrails UI and backend support for agents

application/alembic/versions/0007_agent_guardrails.py

@@ -0,0 +1,38 @@
+"""0007 agent guardrails columns — adds guardrails_enabled, input_guardrails,
+and output_guardrails boolean columns to the agents table.
+
+These columns allow agents to have safety guardrails configured to filter
+and validate input and output separately.
+
+Revision ID: 0007_agent_guardrails
+Revises: 0006_idempotency_lease
+"""
+from typing import Sequence, Union
+from alembic import op
+
+revision: str = "0007_agent_guardrails"
+down_revision: Union[str, None] = "0006_idempotency_lease"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.execute(
+        """
+        ALTER TABLE agents
+            ADD COLUMN guardrails_enabled  BOOLEAN NOT NULL DEFAULT false,
+            ADD COLUMN input_guardrails    BOOLEAN NOT NULL DEFAULT false,
+            ADD COLUMN output_guardrails   BOOLEAN NOT NULL DEFAULT false;
+        """
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        """
+        ALTER TABLE agents
+            DROP COLUMN IF EXISTS guardrails_enabled,
+            DROP COLUMN IF EXISTS input_guardrails,
+            DROP COLUMN IF EXISTS output_guardrails;
+        """
+    )