Add new migration to update finance and jobs categories (#766)

* Add new migration to update finance and jobs categories

* Run migration locally

Author: dfloo

db/migrate/20260603120000_update_sfsg_finance_and_jobs_categories.rb

@@ -0,0 +1,94 @@
+class UpdateSfsgFinanceAndJobsCategories < ActiveRecord::Migration[6.1]
+  def up
+    ActiveRecord::Base.transaction do
+      @assertions_enabled = true
+
+      rename_category(
+        from: 'Financial assistance for living expenses',
+        to: 'Financial Assistance'
+      )
+
+      create_category_relationship 'sfsg-finance', 'Legal Services'
+      create_category_relationship 'sfsg-finance', 'Tax Preparation'
+      create_category_relationship 'sfsg-jobs', 'Alternative Education & GED'
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+
+  private
+
+  def assert_category_exists(name)
+    return unless @assertions_enabled
+
+    count = select_value("SELECT COUNT(*) FROM categories WHERE name = $1", "count category #{name}", [name])
+    raise "Expected category #{name} to exist, got #{count} results" unless count == 1
+  end
+
+  def assert_category_does_not_exist(name)
+    return unless @assertions_enabled
+
+    count = select_value("SELECT COUNT(*) FROM categories WHERE name = $1", "count category #{name}", [name])
+    raise "Expected category #{name} to not exist, got #{count} results" unless count == 0
+  end
+
+  def rename_category(from:, to:)
+    assert_category_exists from
+    assert_category_does_not_exist to
+
+    exec_query <<-SQL, "rename category from #{from} to #{to}", [to, from]
+      UPDATE categories
+        SET name = $1
+        WHERE name = $2;
+    SQL
+  end
+
+  def create_category_relationship(parent_name, child_name)
+    parent_id = select_value(
+      "SELECT id FROM categories WHERE name = $1",
+      "find parent #{parent_name}",
+      [parent_name]
+    )
+
+    child_id = select_value(
+      "SELECT id FROM categories WHERE name = $1",
+      "find child #{child_name}",
+      [child_name]
+    )
+
+    assert_category_relationship_does_not_exist parent_name, child_name
+
+    exec_query <<-SQL, "create category relationship #{parent_name} -> #{child_name}", [parent_id, child_id]
+      INSERT INTO category_relationships (parent_id, child_id)
+        VALUES ($1, $2);
+    SQL
+  end
+
+  def assert_category_relationship_does_not_exist(parent_name, child_name)
+    return unless @assertions_enabled
+
+    parent_id = select_value(
+      "SELECT id FROM categories WHERE name = $1",
+      "find parent #{parent_name}",
+      [parent_name]
+    )
+
+    child_id = select_value(
+      "SELECT id FROM categories WHERE name = $1",
+      "find child #{child_name}",
+      [child_name]
+    )
+
+    raise "Expected parent category #{parent_name} to exist" if parent_id.nil?
+    raise "Expected child category #{child_name} to exist" if child_id.nil?
+
+    count = select_value(
+      "SELECT COUNT(*) FROM category_relationships WHERE parent_id = $1 AND child_id = $2",
+      "count relationship #{parent_name}->#{child_name}",
+      [parent_id, child_id]
+    )
+    raise "Expected relationship #{parent_name}->#{child_name} to not exist, got #{count} results" unless count.to_i == 0
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2026_02_19_165140) do
+ActiveRecord::Schema.define(version: 2026_06_03_120000) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"