feat(acp): add migration 0006 down

migrations/0006_acp.down.sql

@@ -0,0 +1,18 @@
+DROP INDEX IF EXISTS idx_acp_events_created_at;
+DROP INDEX IF EXISTS idx_acp_events_session_id;
+DROP TABLE IF EXISTS acp_events;
+
+ALTER TABLE workspaces DROP CONSTRAINT IF EXISTS workspaces_active_main_session_fk;
+ALTER TABLE workspaces DROP COLUMN IF EXISTS active_main_session_id;
+
+DROP INDEX IF EXISTS idx_acp_sessions_requirement;
+DROP INDEX IF EXISTS idx_acp_sessions_issue;
+DROP INDEX IF EXISTS idx_acp_sessions_user_status;
+DROP INDEX IF EXISTS idx_acp_sessions_workspace_status;
+DROP TABLE IF EXISTS acp_sessions;
+
+ALTER TABLE requirements DROP CONSTRAINT IF EXISTS requirements_project_id_unique;
+ALTER TABLE issues       DROP CONSTRAINT IF EXISTS issues_project_id_unique;
+
+DROP INDEX IF EXISTS idx_acp_agent_kinds_enabled;
+DROP TABLE IF EXISTS acp_agent_kinds;