Add new column name to processes

So we can uniquely identify processes by supervisor and name, without
having to rely on the PID, that can be duplicated across processes.

Author: rosa

db/migrate/20240811173327_add_name_to_processes.rb

@@ -0,0 +1,18 @@
+class AddNameToProcesses < ActiveRecord::Migration[7.1]
+  def up
+    add_column :solid_queue_processes, :name, :string
+
+    SolidQueue::Process.find_each do |process|
+      process.name ||= [ process.kind.downcase, SecureRandom.hex(10) ].join("-")
+      process.save!
+    end
+
+    add_index :solid_queue_processes, [ :name, :supervisor_id ], unique: true
+    change_column :solid_queue_processes, :name, :string, null: false
+  end
+
+  def down
+    remove_index :solid_queue_processes, [ :name, :supervisor_id ]
+    remove_column :solid_queue_processes, :name
+  end
+end

test/dummy/db/schema.rb

@@ -78,7 +78,9 @@
     t.string "hostname"
     t.text "metadata"
     t.datetime "created_at", null: false
+    t.string "name", null: false
     t.index ["last_heartbeat_at"], name: "index_solid_queue_processes_on_last_heartbeat_at"
+    t.index ["name", "supervisor_id"], name: "index_solid_queue_processes_on_name_and_supervisor_id", unique: true
     t.index ["supervisor_id"], name: "index_solid_queue_processes_on_supervisor_id"
   end