LLM cost estimation (#223)

* Password reset back button also after confirmation

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>

* Implement a filter for category (#215)

- Also implement an is empty/is null condition.

* Implement an LLM cost estimation page

Track costs across all the cost categories: auto categorization, auto merchant detection and chat.
Show warning with estimated cost when running a rule that contains AI.

* Update pricing

* Add google pricing

and fix inferred model everywhere.

* Update app/models/llm_usage.rb

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: soky srm <sokysrm@gmail.com>

* FIX address review

* Linter

* Address review

- Lowered log level
- extracted the duplicated record_usage method into a shared concern

* Update app/controllers/settings/llm_usages_controller.rb

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: soky srm <sokysrm@gmail.com>

* Moved attr_reader out of private

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Signed-off-by: soky srm <sokysrm@gmail.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

db/migrate/20251022144638_create_llm_usages.rb

@@ -0,0 +1,20 @@
+class CreateLlmUsages < ActiveRecord::Migration[7.2]
+  def change
+    create_table :llm_usages, id: :uuid do |t|
+      t.references :family, null: false, foreign_key: true, type: :uuid
+      t.string :provider, null: false
+      t.string :model, null: false
+      t.string :operation, null: false
+      t.integer :prompt_tokens, null: false, default: 0
+      t.integer :completion_tokens, null: false, default: 0
+      t.integer :total_tokens, null: false, default: 0
+      t.decimal :estimated_cost, precision: 10, scale: 6, null: false, default: 0.0
+      t.jsonb :metadata, default: {}
+
+      t.timestamps
+    end
+
+    add_index :llm_usages, [ :family_id, :created_at ]
+    add_index :llm_usages, [ :family_id, :operation ]
+  end
+end

db/migrate/20251022151319_allow_null_estimated_cost_in_llm_usages.rb

@@ -0,0 +1,6 @@
+class AllowNullEstimatedCostInLlmUsages < ActiveRecord::Migration[7.2]
+  def change
+    change_column_null :llm_usages, :estimated_cost, true
+    change_column_default :llm_usages, :estimated_cost, from: 0.0, to: nil
+  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_09_03_015009) do
+ActiveRecord::Schema[7.2].define(version: 2025_10_22_151319) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -423,6 +423,23 @@ ActiveRecord::Schema[7.2].define(version: 2025_09_03_015009) do
     t.index ["token"], name: "index_invite_codes_on_token", unique: true
   end
 
+  create_table "llm_usages", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.uuid "family_id", null: false
+    t.string "provider", null: false
+    t.string "model", null: false
+    t.string "operation", null: false
+    t.integer "prompt_tokens", default: 0, null: false
+    t.integer "completion_tokens", default: 0, null: false
+    t.integer "total_tokens", default: 0, null: false
+    t.decimal "estimated_cost", precision: 10, scale: 6
+    t.jsonb "metadata", default: {}
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["family_id", "created_at"], name: "index_llm_usages_on_family_id_and_created_at"
+    t.index ["family_id", "operation"], name: "index_llm_usages_on_family_id_and_operation"
+    t.index ["family_id"], name: "index_llm_usages_on_family_id"
+  end
+
   create_table "loans", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
@@ -910,6 +927,7 @@ ActiveRecord::Schema[7.2].define(version: 2025_09_03_015009) do
   add_foreign_key "imports", "families"
   add_foreign_key "invitations", "families"
   add_foreign_key "invitations", "users", column: "inviter_id"
+  add_foreign_key "llm_usages", "families"
   add_foreign_key "merchants", "families"
   add_foreign_key "messages", "chats"
   add_foreign_key "mobile_devices", "users"