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

backend/alembic/versions/2b4c2f7b3eda_add_agent_heartbeat_config_column.py

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+"""add agent heartbeat config column
+
+Revision ID: 2b4c2f7b3eda
+Revises: 69858cb75533
+Create Date: 2026-02-04 16:36:55.587762
+
+"""
+from __future__ import annotations
+
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = '2b4c2f7b3eda'
+down_revision = '69858cb75533'
+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")

backend/alembic/versions/69858cb75533_add_agent_heartbeat_config.py

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+"""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"
+    )

backend/alembic/versions/cefef25d4634_ensure_heartbeat_config_column.py

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+"""ensure heartbeat config column
+
+Revision ID: cefef25d4634
+Revises: 2b4c2f7b3eda
+Create Date: 2026-02-04 16:38:25.234627
+
+"""
+from __future__ import annotations
+
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = 'cefef25d4634'
+down_revision = '2b4c2f7b3eda'
+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"
+    )

backend/alembic/versions/e0f28e965fa5_add_agent_delete_confirmation.py

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+"""add agent delete confirmation
+
+Revision ID: e0f28e965fa5
+Revises: cefef25d4634
+Create Date: 2026-02-04 16:55:33.389505
+
+"""
+from __future__ import annotations
+
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = 'e0f28e965fa5'
+down_revision = 'cefef25d4634'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute(
+        "ALTER TABLE agents ADD COLUMN IF NOT EXISTS delete_requested_at TIMESTAMP"
+    )
+    op.execute(
+        "ALTER TABLE agents ADD COLUMN IF NOT EXISTS delete_confirm_token_hash VARCHAR"
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        "ALTER TABLE agents DROP COLUMN IF EXISTS delete_confirm_token_hash"
+    )
+    op.execute(
+        "ALTER TABLE agents DROP COLUMN IF EXISTS delete_requested_at"
+    )