-- Backfill ON DELETE clauses on FKs from 0001-0006 and 0026. The pattern
-- (CASCADE for tenant-scoped children, SET NULL for historical references)
-- was learned after v1 shipped and applied consistently from 0010 onward;
-- this migration retrofits the earlier tables so DELETEs succeed instead of
-- either failing with a FK violation or leaving orphans.
--
-- Two FKs stay as NO ACTION deliberately:
--   * audit_log.workspace_id — audit is append-only and must outlive any
--     workspace delete (the trigger blocks UPDATE/DELETE on audit rows).
--   * thread_messages.from_agent — history stays attributable via the
--     agents.deleted_at soft-delete already in schema.
--
-- Two FKs stay NOT NULL and become explicit RESTRICT rather than SET NULL:
--   * agents.managed_by — the Rust domain type is `UserId` (not Option).
--     Making it nullable would ripple through cm-domain/cm-db/cm-api/tests.
--     RESTRICT preserves current behavior (delete blocked) but documents it.
--   * installed_skills.installed_by — same reasoning.
-- To hard-delete a user in either case, reassign or hard-delete the
-- dependent rows first — which matches real org-ownership semantics.

-- ---- 0001_init: workspaces cascade -----------------------------------------
ALTER TABLE users
    DROP CONSTRAINT IF EXISTS users_workspace_id_fkey,
    ADD  CONSTRAINT users_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE;

ALTER TABLE agents
    DROP CONSTRAINT IF EXISTS agents_workspace_id_fkey,
    ADD  CONSTRAINT agents_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE;

ALTER TABLE agents
    DROP CONSTRAINT IF EXISTS agents_managed_by_fkey,
    ADD  CONSTRAINT agents_managed_by_fkey
         FOREIGN KEY (managed_by) REFERENCES users (id) ON DELETE RESTRICT;

ALTER TABLE sessions
    DROP CONSTRAINT IF EXISTS sessions_agent_id_fkey,
    ADD  CONSTRAINT sessions_agent_id_fkey
         FOREIGN KEY (agent_id) REFERENCES agents (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS sessions_workspace_id_fkey,
    ADD  CONSTRAINT sessions_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE;

ALTER TABLE messages
    DROP CONSTRAINT IF EXISTS messages_session_id_fkey,
    ADD  CONSTRAINT messages_session_id_fkey
         FOREIGN KEY (session_id) REFERENCES sessions (id) ON DELETE CASCADE;

ALTER TABLE steps
    DROP CONSTRAINT IF EXISTS steps_message_id_fkey,
    ADD  CONSTRAINT steps_message_id_fkey
         FOREIGN KEY (message_id) REFERENCES messages (id) ON DELETE CASCADE;

ALTER TABLE agent_runs
    DROP CONSTRAINT IF EXISTS agent_runs_session_id_fkey,
    ADD  CONSTRAINT agent_runs_session_id_fkey
         FOREIGN KEY (session_id) REFERENCES sessions (id) ON DELETE CASCADE;

ALTER TABLE approvals
    DROP CONSTRAINT IF EXISTS approvals_workspace_id_fkey,
    ADD  CONSTRAINT approvals_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS approvals_run_id_fkey,
    ADD  CONSTRAINT approvals_run_id_fkey
         FOREIGN KEY (run_id) REFERENCES agent_runs (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS approvals_requested_by_agent_fkey,
    ADD  CONSTRAINT approvals_requested_by_agent_fkey
         FOREIGN KEY (requested_by_agent) REFERENCES agents (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS approvals_decided_by_fkey,
    ADD  CONSTRAINT approvals_decided_by_fkey
         FOREIGN KEY (decided_by) REFERENCES users (id) ON DELETE SET NULL;

-- Single-use execution grants: deleting the approval should drop the grant.
ALTER TABLE execution_grants
    DROP CONSTRAINT IF EXISTS execution_grants_approval_id_fkey,
    ADD  CONSTRAINT execution_grants_approval_id_fkey
         FOREIGN KEY (approval_id) REFERENCES approvals (id) ON DELETE CASCADE;

-- audit_log.workspace_id — intentionally left as NO ACTION.

ALTER TABLE skills
    DROP CONSTRAINT IF EXISTS skills_workspace_id_fkey,
    ADD  CONSTRAINT skills_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE;

ALTER TABLE installed_skills
    DROP CONSTRAINT IF EXISTS installed_skills_skill_id_fkey,
    ADD  CONSTRAINT installed_skills_skill_id_fkey
         FOREIGN KEY (skill_id) REFERENCES skills (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS installed_skills_installed_by_fkey,
    ADD  CONSTRAINT installed_skills_installed_by_fkey
         FOREIGN KEY (installed_by) REFERENCES users (id) ON DELETE RESTRICT;

ALTER TABLE secrets
    DROP CONSTRAINT IF EXISTS secrets_workspace_id_fkey,
    ADD  CONSTRAINT secrets_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE;

ALTER TABLE app_connections
    DROP CONSTRAINT IF EXISTS app_connections_workspace_id_fkey,
    ADD  CONSTRAINT app_connections_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS app_connections_agent_id_fkey,
    ADD  CONSTRAINT app_connections_agent_id_fkey
         FOREIGN KEY (agent_id) REFERENCES agents (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS app_connections_secret_ref_fkey,
    ADD  CONSTRAINT app_connections_secret_ref_fkey
         FOREIGN KEY (secret_ref) REFERENCES secrets (id) ON DELETE SET NULL;

ALTER TABLE threads
    DROP CONSTRAINT IF EXISTS threads_workspace_id_fkey,
    ADD  CONSTRAINT threads_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE;

ALTER TABLE thread_participants
    DROP CONSTRAINT IF EXISTS thread_participants_agent_id_fkey,
    ADD  CONSTRAINT thread_participants_agent_id_fkey
         FOREIGN KEY (agent_id) REFERENCES agents (id) ON DELETE CASCADE;

-- thread_messages.thread_id → CASCADE; from_agent stays NO ACTION.
ALTER TABLE thread_messages
    DROP CONSTRAINT IF EXISTS thread_messages_thread_id_fkey,
    ADD  CONSTRAINT thread_messages_thread_id_fkey
         FOREIGN KEY (thread_id) REFERENCES threads (id) ON DELETE CASCADE;

ALTER TABLE file_nodes
    DROP CONSTRAINT IF EXISTS file_nodes_workspace_id_fkey,
    ADD  CONSTRAINT file_nodes_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS file_nodes_agent_id_fkey,
    ADD  CONSTRAINT file_nodes_agent_id_fkey
         FOREIGN KEY (agent_id) REFERENCES agents (id) ON DELETE CASCADE;

ALTER TABLE credit_lots
    DROP CONSTRAINT IF EXISTS credit_lots_workspace_id_fkey,
    ADD  CONSTRAINT credit_lots_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE;

ALTER TABLE usage_events
    DROP CONSTRAINT IF EXISTS usage_events_workspace_id_fkey,
    ADD  CONSTRAINT usage_events_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS usage_events_agent_id_fkey,
    ADD  CONSTRAINT usage_events_agent_id_fkey
         FOREIGN KEY (agent_id) REFERENCES agents (id) ON DELETE SET NULL,
    DROP CONSTRAINT IF EXISTS usage_events_run_id_fkey,
    ADD  CONSTRAINT usage_events_run_id_fkey
         FOREIGN KEY (run_id) REFERENCES agent_runs (id) ON DELETE SET NULL;

-- ---- 0002_auth_sessions ---------------------------------------------------
ALTER TABLE auth_sessions
    DROP CONSTRAINT IF EXISTS auth_sessions_user_id_fkey,
    ADD  CONSTRAINT auth_sessions_user_id_fkey
         FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE;

-- ---- 0003_run_events ------------------------------------------------------
ALTER TABLE run_events
    DROP CONSTRAINT IF EXISTS run_events_run_id_fkey,
    ADD  CONSTRAINT run_events_run_id_fkey
         FOREIGN KEY (run_id) REFERENCES agent_runs (id) ON DELETE CASCADE;

-- ---- 0004_outbox ----------------------------------------------------------
ALTER TABLE outbox
    DROP CONSTRAINT IF EXISTS outbox_workspace_id_fkey,
    ADD  CONSTRAINT outbox_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS outbox_agent_id_fkey,
    ADD  CONSTRAINT outbox_agent_id_fkey
         FOREIGN KEY (agent_id) REFERENCES agents (id) ON DELETE CASCADE;

-- ---- 0005_oauth_states ----------------------------------------------------
ALTER TABLE oauth_states
    DROP CONSTRAINT IF EXISTS oauth_states_workspace_id_fkey,
    ADD  CONSTRAINT oauth_states_workspace_id_fkey
         FOREIGN KEY (workspace_id) REFERENCES workspaces (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS oauth_states_user_id_fkey,
    ADD  CONSTRAINT oauth_states_user_id_fkey
         FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE,
    DROP CONSTRAINT IF EXISTS oauth_states_agent_id_fkey,
    ADD  CONSTRAINT oauth_states_agent_id_fkey
         FOREIGN KEY (agent_id) REFERENCES agents (id) ON DELETE CASCADE;

-- ---- 0006_promo_codes -----------------------------------------------------
ALTER TABLE promo_codes
    DROP CONSTRAINT IF EXISTS promo_codes_redeemed_by_fkey,
    ADD  CONSTRAINT promo_codes_redeemed_by_fkey
         FOREIGN KEY (redeemed_by) REFERENCES workspaces (id) ON DELETE SET NULL;

-- ---- 0026_group_rooms -----------------------------------------------------
-- The threads.created_by / thread_participants.added_by columns were added
-- nullable by 0026, so SET NULL is legal.
ALTER TABLE threads
    DROP CONSTRAINT IF EXISTS threads_created_by_fkey,
    ADD  CONSTRAINT threads_created_by_fkey
         FOREIGN KEY (created_by) REFERENCES agents (id) ON DELETE SET NULL;

ALTER TABLE thread_participants
    DROP CONSTRAINT IF EXISTS thread_participants_added_by_fkey,
    ADD  CONSTRAINT thread_participants_added_by_fkey
         FOREIGN KEY (added_by) REFERENCES agents (id) ON DELETE SET NULL;