feat(agents): Add heartbeat configuration and delete confirmation for agents

backend/alembic/versions/69858cb75533_add_agent_heartbeat_config.py

@@ -0,0 +1,29 @@
+"""add agent heartbeat config
+
+Revision ID: 69858cb75533
+Revises: f1a2b3c4d5e6
+Create Date: 2026-02-04 16:32:42.028772
+
+"""
+from __future__ import annotations
+
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = '69858cb75533'
+down_revision = 'f1a2b3c4d5e6'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute(
+        "ALTER TABLE agents ADD COLUMN IF NOT EXISTS heartbeat_config JSON"
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        "ALTER TABLE agents DROP COLUMN IF EXISTS heartbeat_config"
+    )