feat: update migration script to drop old workflow tables with CASCADE

[pikann]

Problem

Migration 000027_add_automation_graph.sql was failing at startup with:

auto-migrate: migrations: exec "000027_add_automation_graph.sql": ERROR: cannot drop table workflow_nodes because other objects depend on it (SQLSTATE 2BP01)

PostgreSQL refuses a plain DROP TABLE when any other object holds a dependency on the target table — in this case workflow_edges has two FK columns (source_node_id, target_node_id) that reference workflow_nodes(id). This can happen when a previous migration run was interrupted mid-transaction, leaving the dependency graph in a partially-applied state.

Solution

Added CASCADE to all five DROP TABLE IF EXISTS statements in the workflow-cleanup section of the migration.

DROP TABLE IF EXISTS workflow_edges CASCADE;
DROP TABLE IF EXISTS workflow_status_transitions CASCADE;
DROP TABLE IF EXISTS workflow_status_rules CASCADE;
DROP TABLE IF EXISTS workflow_nodes CASCADE;
DROP TABLE IF EXISTS workflows CASCADE;

CASCADE instructs Postgres to automatically drop any dependent objects (foreign key constraints, indexes, views) along with the table, making the cleanup idempotent and resilient to whatever state the database is in from a prior partial run.

This is safe because the explicit design decision in migration 000027 is to remove all old workflow data entirely — there is no production data worth preserving from the old workflow feature.

Changes

• services/api/migrations/000027_add_automation_graph.sql — added CASCADE to the five DROP TABLE IF EXISTS statements that tear down the legacy workflows / workflow_nodes / workflow_edges / workflow_status_rules / workflow_status_transitions tables.

[pullfrog]

Reviewed changes

• Add CASCADE to workflow table drops: The migration now drops the five legacy workflow tables with CASCADE, ensuring any FK constraints or dependent objects from a partially-completed prior migration run don't block the drop.

✅ No new issues found.

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