Create Readout model

app/models/readout.rb

@@ -0,0 +1,5 @@
+class Readout < ApplicationRecord
+  belongs_to :user
+  belongs_to :quantity
+  belongs_to :unit
+end

db/migrate/20250121230456_create_readouts.rb

@@ -0,0 +1,15 @@
+class CreateReadouts < ActiveRecord::Migration[7.2]
+  def change
+    create_table :readouts do |t|
+      t.references :user, null: false, foreign_key: true
+      t.references :quantity, null: false, foreign_key: true
+      t.references :unit, foreign_key: true
+      t.decimal :value, null: false, precision: 30, scale: 15
+      #t.references :collector, foreign_key: true
+      #t.references :device, foreign_key: true
+
+      t.timestamps null: false
+    end
+    add_index :readouts, [:quantity_id, :created_at], unique: true
+  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[7.2].define(version: 2025_01_04_194343) do
+ActiveRecord::Schema[7.2].define(version: 2025_01_21_230456) do
   create_table "quantities", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "user_id"
     t.string "name", limit: 31, null: false
@@ -24,6 +24,19 @@ ActiveRecord::Schema[7.2].define(version: 2025_01_04_194343) do
     t.index ["user_id"], name: "index_quantities_on_user_id"
   end
 
+  create_table "readouts", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "user_id", null: false
+    t.bigint "quantity_id", null: false
+    t.bigint "unit_id"
+    t.decimal "value", precision: 30, scale: 15, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["quantity_id", "created_at"], name: "index_readouts_on_quantity_id_and_created_at", unique: true
+    t.index ["quantity_id"], name: "index_readouts_on_quantity_id"
+    t.index ["unit_id"], name: "index_readouts_on_unit_id"
+    t.index ["user_id"], name: "index_readouts_on_user_id"
+  end
+
   create_table "units", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "user_id"
     t.string "symbol", limit: 15, null: false
@@ -57,6 +70,9 @@ ActiveRecord::Schema[7.2].define(version: 2025_01_04_194343) do
 
   add_foreign_key "quantities", "quantities", column: "parent_id"
   add_foreign_key "quantities", "users"
+  add_foreign_key "readouts", "quantities"
+  add_foreign_key "readouts", "units"
+  add_foreign_key "readouts", "users"
   add_foreign_key "units", "units", column: "base_id"
   add_foreign_key "units", "users"
 end