feat: implement basic fairy tracker

db/migrate/20250310183139_create_instances.rb

@@ -8,5 +8,7 @@ class CreateInstances < ActiveRecord::Migration[8.0]
 
       t.timestamps
     end
+
+    add_index :instances, :public_id
   end
 end

db/migrate/20250310183912_create_fairies.rb

@@ -1,7 +1,7 @@
 class CreateFairies < ActiveRecord::Migration[8.0]
   def change
     create_table :fairies do |t|
-      t.integer :location
+      t.string :location
       t.boolean :is_despawned
       t.boolean :is_suggested
       t.references :instance, null: false, foreign_key: true

db/schema.rb

@@ -15,7 +15,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_03_10_183912) do
   enable_extension "pg_catalog.plpgsql"
 
   create_table "fairies", force: :cascade do |t|
-    t.integer "location"
+    t.string "location"
     t.boolean "is_despawned"
     t.boolean "is_suggested"
     t.bigint "instance_id", null: false
@@ -31,6 +31,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_03_10_183912) do
     t.string "zone"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.index ["public_id"], name: "index_instances_on_public_id"
   end
 
   create_table "pops", force: :cascade do |t|